实现插件

.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+.packages
+build/

.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled.
+
+version:
+  revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+  channel: stable
+
+project_type: plugin
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+      base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+    - platform: android
+      create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+      base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+    - platform: ios
+      create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+      base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

CHANGELOG.md

+## 0.0.1
+
+* TODO: Describe initial release.

LICENSE

+TODO: Add your license here.

analysis_options.yaml

+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

android/.gitignore

+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.cxx

android/build.gradle

+group 'com.example.hi_teacher_screenshot_listener'
+version '1.0'
+
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.2.0'
+    }
+}
+
+rootProject.allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 34
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    defaultConfig {
+        minSdkVersion 16
+    }
+}

android/settings.gradle

+rootProject.name = 'hi_teacher_screenshot_listener'

android/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="com.example.hi_teacher_screenshot_listener">
+    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES"/>
+</manifest>

android/src/main/java/com/example/hi_teacher_screenshot_listener/HiTeacherScreenshotListenerPlugin.java

+package com.example.hi_teacher_screenshot_listener;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Build;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
+import java.util.HashMap;
+
+import io.flutter.embedding.engine.plugins.FlutterPlugin;
+import io.flutter.embedding.engine.plugins.activity.ActivityAware;
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.plugin.common.EventChannel;
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
+import io.flutter.plugin.common.MethodChannel.Result;
+
+/** HiTeacherScreenshotListenerPlugin */
+public class HiTeacherScreenshotListenerPlugin implements FlutterPlugin, MethodCallHandler, ActivityAware {
+  /// The MethodChannel that will the communication between Flutter and native Android
+  ///
+  /// This local reference serves to register the plugin with the Flutter Engine and unregister it
+  /// when the Flutter Engine is detached from the Activity
+  private MethodChannel channel;
+  private EventChannel.EventSink eventSink;
+  private ScreenshotHelper screenshotHelper;
+
+  private Activity activity;
+
+  static final String CHANNEL_NAME = "dev.hiteacher.screenshot_listener/bridge";
+  static final String EVENT_CHANNEL_NAME = "dev.hiteacher.screenshot_listener/listener";
+
+  @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
+  @Override
+  public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {
+    channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), CHANNEL_NAME);
+    channel.setMethodCallHandler(this);
+    EventChannel eventChannel = new EventChannel(flutterPluginBinding.getBinaryMessenger(), EVENT_CHANNEL_NAME);
+    eventChannel.setStreamHandler(new EventChannel.StreamHandler() {
+      @Override
+      public void onListen(Object o, EventChannel.EventSink tempEventSink) {
+        eventSink = tempEventSink;
+      }
+
+      @Override
+      public void onCancel(Object o) {
+        eventSink = null;
+        screenshotHelper.stop();
+      }
+    });
+    Context applicationContext = flutterPluginBinding.getApplicationContext();
+    screenshotHelper = new ScreenshotHelper(applicationContext);
+    screenshotHelper.setScreenshotListener(data -> {
+      if (eventSink != null) {
+        eventSink.success(data);
+      }
+    });
+
+  }
+
+  @Override
+  public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
+    if (call.method.equals("start")) {
+      String failReason = "";
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+        final int permission = ContextCompat.checkSelfPermission(activity.getApplicationContext(), android.Manifest.permission.READ_MEDIA_IMAGES);
+        if (permission != PackageManager.PERMISSION_GRANTED) {
+          ActivityCompat.requestPermissions(activity, new String[]{android.Manifest.permission.READ_MEDIA_IMAGES}, 0);
+        }
+        if (permission == PackageManager.PERMISSION_DENIED) {
+          failReason = "访问相册权限被拒";
+        }
+      }
+      screenshotHelper.start();
+      HashMap<String, Object> map = new HashMap<>();
+      map.put("success", failReason.isEmpty());
+      map.put("message", failReason);
+      result.success(map);
+    } else {
+      result.notImplemented();
+    }
+  }
+
+  @Override
+  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
+    channel.setMethodCallHandler(null);
+  }
+
+  @Override
+  public void onAttachedToActivity(@NonNull ActivityPluginBinding activityPluginBinding) {
+    activity = activityPluginBinding.getActivity();
+  }
+
+  @Override
+  public void onDetachedFromActivityForConfigChanges() {
+
+  }
+
+  @Override
+  public void onReattachedToActivityForConfigChanges(@NonNull ActivityPluginBinding activityPluginBinding) {
+    onAttachedToActivity(activityPluginBinding);
+  }
+
+  @Override
+  public void onDetachedFromActivity() {
+
+  }
+}

android/src/main/java/com/example/hi_teacher_screenshot_listener/ScreenshotHelper.java

+package com.example.hi_teacher_screenshot_listener;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.provider.MediaStore;
+import android.text.TextUtils;
+
+import androidx.annotation.NonNull;
+
+import org.jetbrains.annotations.Nullable;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class ScreenshotHelper {
+    private static final String[] KEYWORDS = {
+            "screenshot", "screen_shot", "screen-shot", "screen shot",
+            "screencapture", "screen_capture", "screen-capture", "screen capture",
+            "screencap", "screen_cap", "screen-cap", "screen cap", "snap", "截屏"
+    };
+
+    /**
+     * 读取媒体数据库时需要读取的列
+     */
+    private static final String[] MEDIA_PROJECTIONS = {
+            MediaStore.Images.ImageColumns.DATA,
+            MediaStore.Images.ImageColumns.DATE_TAKEN,
+            MediaStore.Images.ImageColumns.DATE_ADDED
+    };
+    /**
+     * 内部存储器内容观察者
+     */
+    private final ContentObserver mInternalObserver = new MediaContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI, null);
+    /**
+     * 外部存储器内容观察者
+     */
+    private final ContentObserver mExternalObserver = new MediaContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null);
+    private final ContentResolver mResolver;
+    private final AtomicBoolean running = new AtomicBoolean(false);
+    private final Handler handler = new Handler(Looper.getMainLooper());
+    private OnScreenShotListener listener;
+    private String lastData;
+    private final Runnable shotCallBack = new Runnable() {
+        @Override
+        public void run() {
+            if (listener != null) {
+                final String path = lastData;
+                if (path != null && !path.isEmpty()) {
+                    listener.onShot(path);
+                }
+            }
+        }
+    };
+
+    public ScreenshotHelper(@NonNull Context context) {
+        mResolver = context.getApplicationContext().getContentResolver();
+    }
+
+    public void setScreenshotListener(@Nullable OnScreenShotListener listener) {
+        this.listener = listener;
+    }
+
+    public boolean isRunning() {
+        return running.get();
+    }
+
+    //    @RequiresPermission(anyOf = {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.READ_MEDIA_IMAGES})
+    public void start() {
+        if (running.get()) {
+            return;
+        }
+        running.set(true);
+        mResolver.registerContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI, true, mInternalObserver);
+        mResolver.registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, mExternalObserver);
+    }
+
+    public void stop() {
+        if (!running.get()) {
+            return;
+        }
+        running.set(false);
+        mResolver.unregisterContentObserver(mInternalObserver);
+        mResolver.unregisterContentObserver(mExternalObserver);
+    }
+
+    private void handleMediaContentChange(Uri contentUri) {
+        Cursor cursor = null;
+        try {
+            // 数据改变时查询数据库中最后加入的一条数据
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                Bundle queryArgs = new Bundle();
+                queryArgs.putInt(ContentResolver.QUERY_ARG_SORT_DIRECTION, ContentResolver.QUERY_SORT_DIRECTION_DESCENDING);
+                queryArgs.putStringArray(ContentResolver.QUERY_ARG_SORT_COLUMNS, new String[]{MediaStore.Images.ImageColumns.DATE_ADDED});
+                queryArgs.putInt(ContentResolver.QUERY_ARG_OFFSET, 0);
+                queryArgs.putInt(ContentResolver.QUERY_ARG_LIMIT, 1);
+                cursor = mResolver.query(contentUri, MEDIA_PROJECTIONS, queryArgs, null);
+            } else {
+                cursor = mResolver.query(contentUri, MEDIA_PROJECTIONS, null, null, MediaStore.Images.ImageColumns.DATE_ADDED + " desc limit 1");
+            }
+            if (cursor == null) {
+                return;
+            }
+            if (!cursor.moveToFirst()) {
+                return;
+            }
+            // 获取各列的索引
+            int dataIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
+            int dateTakenIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATE_TAKEN);
+            int dateAddIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATE_ADDED);
+            // 获取行数据
+            final String data = cursor.getString(dataIndex);
+            long dateTaken = cursor.getLong(dateTakenIndex);
+            long dateAdded = cursor.getLong(dateAddIndex);
+            if (!data.isEmpty()) {
+                if (TextUtils.equals(lastData, data)) {
+                    //更改资源文件名也会触发，并且传递过来的是之前的截屏文件，所以只对2分钟以内的有效
+                    if (System.currentTimeMillis() - dateTaken < 7200) {
+                        handler.removeCallbacks(shotCallBack);
+                        handler.postDelayed(shotCallBack, 500);
+                    }
+                } else if (dateTaken == 0 || dateTaken == dateAdded * 1000) {
+                    //此时为缩略图
+                    handler.removeCallbacks(shotCallBack);
+                    if (listener != null) {
+                        listener.onShot(null);
+                    }
+                } else if (checkScreenShot(data)) {
+                    handler.removeCallbacks(shotCallBack);
+                    lastData = data;
+                    handler.postDelayed(shotCallBack, 500);
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            if (cursor != null && !cursor.isClosed()) {
+                cursor.close();
+            }
+        }
+    }
+
+    /**
+     * 根据包含关键字判断是否是截屏
+     */
+    private boolean checkScreenShot(String data) {
+        if (data == null || data.length() < 2) {
+            return false;
+        }
+        data = data.toLowerCase();
+        for (String keyWork : KEYWORDS) {
+            if (data.contains(keyWork)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private class MediaContentObserver extends ContentObserver {
+        private final Uri mContentUri;
+
+        MediaContentObserver(Uri contentUri, Handler handler) {
+            super(handler);
+            mContentUri = contentUri;
+        }
+
+        @Override
+        public void onChange(boolean selfChange) {
+            super.onChange(selfChange);
+            if (listener != null) {
+                handleMediaContentChange(mContentUri);
+            }
+        }
+    }
+
+    public interface OnScreenShotListener {
+        void onShot(@Nullable String data);
+    }
+
+}
+

example/.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

example/README.md

+# hi_teacher_screenshot_listener_example
+
+Demonstrates how to use the hi_teacher_screenshot_listener plugin.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

example/analysis_options.yaml

+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at
+  # https://dart-lang.github.io/linter/lints/index.html.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

example/android/.gitignore

+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

example/android/app/build.gradle

+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.hi_teacher_screenshot_listener_example"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion 19
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}

example/android/app/src/debug/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.hi_teacher_screenshot_listener_example">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/app/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.hi_teacher_screenshot_listener_example">
+   <application
+        android:label="hi_teacher_screenshot_listener_example"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

example/android/app/src/main/java/com/example/hi_teacher_screenshot_listener_example/MainActivity.java

+package com.example.hi_teacher_screenshot_listener_example;
+
+import io.flutter.embedding.android.FlutterActivity;
+
+public class MainActivity extends FlutterActivity {
+}

example/android/app/src/main/res/drawable-v21/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/drawable/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/values-night/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

example/android/app/src/main/res/values/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

example/android/app/src/profile/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.hi_teacher_screenshot_listener_example">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/build.gradle

+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.2.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

example/android/gradle.properties

+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true

example/android/gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

example/android/settings.gradle

+include ':app'
+
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
+
+assert localPropertiesFile.exists()
+localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
+
+def flutterSdkPath = properties.getProperty("flutter.sdk")
+assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"

example/ios/.gitignore

+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

example/ios/Flutter/AppFrameworkInfo.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>11.0</string>
+</dict>
+</plist>

example/ios/Flutter/Debug.xcconfig

+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"

example/ios/Flutter/Release.xcconfig

+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"

example/ios/Podfile

+# Uncomment this line to define a global platform for your project
+# platform :ios, '11.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end

example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1300"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

example/ios/Runner.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner/AppDelegate.h

+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : FlutterAppDelegate
+
+@end

example/ios/Runner/AppDelegate.m

+#import "AppDelegate.h"
+#import "GeneratedPluginRegistrant.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  [GeneratedPluginRegistrant registerWithRegistry:self];
+  // Override point for customization after application launch.
+  return [super application:application didFinishLaunchingWithOptions:launchOptions];
+}
+
+@end

example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.
\ No newline at end of file

example/ios/Runner/Base.lproj/LaunchScreen.storyboard

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

example/ios/Runner/Base.lproj/Main.storyboard

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

example/ios/Runner/Info.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Hi Teacher Screenshot Listener</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>hi_teacher_screenshot_listener_example</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner/main.m

+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}

example/lib/listen_page.dart

+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:hi_teacher_screenshot_listener/hi_teacher_screenshot_listener.dart';
+
+class ListenPage extends StatefulWidget {
+  const ListenPage({Key? key}) : super(key: key);
+
+  @override
+  State<ListenPage> createState() => _ListenPageState();
+}
+
+class _ListenPageState extends State<ListenPage> {
+  final _screenshotListenerPlugin = HiTeacherScreenshotListener();
+  StreamSubscription? _screenshotSubscription;
+  String _screenshotPath = '';
+
+  @override
+  void initState() {
+    super.initState();
+    _screenshotSubscription =
+        _screenshotListenerPlugin.getUserScreenshot().listen(
+              (screenshotPath) {
+            if (screenshotPath != null) {
+              setState(() {
+                _screenshotPath = screenshotPath;
+              });
+              debugPrint(screenshotPath);
+            }
+          },
+        );
+  }
+
+  @override
+  void dispose() {
+    _screenshotSubscription?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(
+          title: const Text('Listen Page'),
+          leading: IconButton(
+            icon: const Icon(Icons.arrow_back_ios),
+            onPressed: () {
+              Navigator.pop(context);
+            },
+          ),
+        ),
+        body: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            _screenshotPath.isEmpty
+                ? const SizedBox()
+                : Image.file(
+              File(_screenshotPath),
+              height: 200,
+              width: 200,
+            ),
+            Row(),
+            ElevatedButton(
+              onPressed: () async {
+                final result = await _screenshotListenerPlugin.startListen();
+                debugPrint(
+                    '------> success = ${result['success']} message = ${result['message']}');
+              },
+              child: const Text('开始监听'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

example/lib/main.dart

+import 'package:flutter/material.dart';
+import 'package:hi_teacher_screenshot_listener_example/listen_page.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatefulWidget {
+  const MyApp({super.key});
+
+  @override
+  State<MyApp> createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  @override
+  void initState() {
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Builder(
+        builder: (context) {
+          return Scaffold(
+            appBar: AppBar(
+              title: const Text('Plugin example app'),
+            ),
+            body: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                ElevatedButton(
+                  onPressed: () {
+                    Navigator.push(context,
+                        MaterialPageRoute(builder: (context) {
+                          return const ListenPage();
+                        }));
+                  },
+                  child: const Text('去监听页'),
+                ),
+                Row(),
+              ],
+            ),
+          );
+        },
+      ),
+    );
+  }
+}

example/pubspec.lock

+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: bfe67ef28df125b7dddcea62755991f807aa39a2492a23e1550161692950bbe0
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.10.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: e6a326c8af69605aec75ed6c187d06b349707a27fbff8222ca9cc2cff167975c
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.1"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: cfc915e6923fe5ce6e153b0723c753045de46de1b4d63771530504004a45fae0
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.17.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      sha256: d57953e10f9f8327ce64a508a355f0b1ec902193f66288e8cb5070e7c47eeb2d
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.0.6"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: a25a15ebbdfc33ab1cd26c63a6ee519df92338a9c10f122adda92938253bef04
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.3"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  hi_teacher_screenshot_listener:
+    dependency: "direct main"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "0.0.1"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: "5528c2f391ededb7775ec1daa69e65a2d61276f7552de2b5f7b8d34ee9fd4ab7"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.6.5"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: "5e4a9cd06d447758280a8ac2405101e0e2094d2a1dbdd3756aec3fe7775ba593"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.1"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: "16db949ceee371e9b99d22f88fa3a73c4e59fd0afed0bd25fc336eb76c198b72"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.13"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: d92141dc6fe1dad30722f9aa826c7fbc896d021d792f80678280601aff8cf724
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.2.0"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: "6c268b42ed578a53088d834796959e4a1814b5e9e164f147f580a386e5decf42"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: db9d4f58c908a4ba5953fcee2ae317c94889433e5024c27ce74a37f94267945b
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.2"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: da3fdfeccc4d4ff2da8f8c556704c08f912542c5fb3cf2233ed75372384a034d
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.6"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.9.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.11.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.1"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: ad540f65f92caa91bf21dfc8ffb8c589d6e4dc0c2267818b4cc2792857706206
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.4.16"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.4"
+sdks:
+  dart: ">=2.19.6 <3.0.0"
+  flutter: ">=2.5.0"

example/pubspec.yaml

+name: hi_teacher_screenshot_listener_example
+description: Demonstrates how to use the hi_teacher_screenshot_listener plugin.
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+environment:
+  sdk: '>=2.19.6 <3.0.0'
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+  flutter:
+    sdk: flutter
+
+  hi_teacher_screenshot_listener:
+    # When depending on this package from a real application you should use:
+    #   hi_teacher_screenshot_listener: ^x.y.z
+    # See https://dart.dev/tools/pub/dependencies#version-constraints
+    # The example app is bundled with the plugin so we use a path dependency on
+    # the parent directory to use the current plugin's version.
+    path: ../
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  cupertino_icons: ^1.0.2
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  # The "flutter_lints" package below contains a set of recommended lints to
+  # encourage good coding practices. The lint set provided by the package is
+  # activated in the `analysis_options.yaml` file located at the root of your
+  # package. See that file for information about deactivating specific lint
+  # rules and activating additional ones.
+  flutter_lints: ^2.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages

example/test/widget_test.dart

+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:hi_teacher_screenshot_listener_example/main.dart';
+
+void main() {
+  testWidgets('Verify Platform version', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const MyApp());
+
+    // Verify that platform version is retrieved.
+    expect(
+      find.byWidgetPredicate(
+        (Widget widget) => widget is Text &&
+                           widget.data!.startsWith('Running on:'),
+      ),
+      findsOneWidget,
+    );
+  });
+}

ios/.gitignore

+.idea/
+.vagrant/
+.sconsign.dblite
+.svn/
+
+.DS_Store
+*.swp
+profile
+
+DerivedData/
+build/
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
+
+.generated/
+
+*.pbxuser
+*.mode1v3
+*.mode2v3
+*.perspectivev3
+
+!default.pbxuser
+!default.mode1v3
+!default.mode2v3
+!default.perspectivev3
+
+xcuserdata
+
+*.moved-aside
+
+*.pyc
+*sync/
+Icon?
+.tags*
+
+/Flutter/Generated.xcconfig
+/Flutter/ephemeral/
+/Flutter/flutter_export_environment.sh
\ No newline at end of file

ios/Classes/HiTeacherScreenshotListenerPlugin.h

+#import <Flutter/Flutter.h>
+
+@interface HiTeacherScreenshotListenerPlugin : NSObject<FlutterPlugin>
+@end

ios/Classes/HiTeacherScreenshotListenerPlugin.m

+#import "HiTeacherScreenshotListenerPlugin.h"
+
+static  NSString * const methodChannelName = @"dev.hiteacher.screenshot_listener/bridge";
+static NSString * const screenshotChannelName = @"dev.hiteacher.screenshot_listener/listener";
+
+@interface HiTeacherScreenshotListenerPlugin()<FlutterStreamHandler>
+@property (nonatomic, copy, nonnull) FlutterEventSink eventSink;
+@end
+
+@implementation HiTeacherScreenshotListenerPlugin
++ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
+    FlutterMethodChannel* channel = [FlutterMethodChannel methodChannelWithName:methodChannelName
+                                                                binaryMessenger:[registrar messenger]];
+    HiTeacherScreenshotListenerPlugin* instance = [[HiTeacherScreenshotListenerPlugin alloc] init];
+    
+    FlutterEventChannel *eventChannel = [FlutterEventChannel eventChannelWithName:screenshotChannelName
+                                                                  binaryMessenger:[registrar messenger]];
+    [eventChannel setStreamHandler: instance];
+    [registrar addMethodCallDelegate:instance channel:channel];
+}
+
+- (void)startListen {
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(userDidTakeScreenshot:) name:UIApplicationUserDidTakeScreenshotNotification
+                                               object:nil];
+}
+
+- (void)userDidTakeScreenshot:(NSNotification *)notification {
+    UIImage *image = [self dataWithScreenshotInPNGFormat];
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        NSString *tempDir = NSTemporaryDirectory();
+        NSError *error = nil;
+        NSDate* date = [NSDate dateWithTimeIntervalSinceNow:0];
+        NSInteger time = (NSInteger)[date timeIntervalSince1970]*1000;
+        NSString *filePath = [NSString stringWithFormat:@"%@/%zd.jpeg", tempDir, time];
+        [UIImageJPEGRepresentation(image, 1.0) writeToFile:filePath
+                                                   options:NSDataWritingAtomic
+                                                     error:&error];
+        if (error == nil) {
+            self.eventSink(filePath);
+        }
+    });
+}
+
+- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
+    if ([@"start" isEqualToString:call.method]) {
+        [self startListen];
+        result(@{@"success": @YES, @"message" : @""});
+    }
+    else {
+        result(FlutterMethodNotImplemented);
+    }
+}
+
+- (FlutterError * _Nullable)onCancelWithArguments:(id _Nullable)arguments {
+    _eventSink = nil;
+    [self cancelListen];
+    return nil;
+}
+
+- (FlutterError * _Nullable)onListenWithArguments:(id _Nullable)arguments eventSink:(nonnull FlutterEventSink)events {
+    if (events) {
+        _eventSink = events;
+    }
+    return nil;
+}
+
+- (UIImage *)dataWithScreenshotInPNGFormat
+{
+    CGSize imageSize = CGSizeZero;
+    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
+    if (UIInterfaceOrientationIsPortrait(orientation))
+        imageSize = [UIScreen mainScreen].bounds.size;
+    else
+        imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
+    
+    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
+    CGContextRef context = UIGraphicsGetCurrentContext();
+    for (UIWindow *window in [[UIApplication sharedApplication] windows])
+    {
+        CGContextSaveGState(context);
+        CGContextTranslateCTM(context, window.center.x, window.center.y);
+        CGContextConcatCTM(context, window.transform);
+        CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
+        if (orientation == UIInterfaceOrientationLandscapeLeft)
+        {
+            CGContextRotateCTM(context, M_PI_2);
+            CGContextTranslateCTM(context, 0, -imageSize.width);
+        }
+        else if (orientation == UIInterfaceOrientationLandscapeRight)
+        {
+            CGContextRotateCTM(context, -M_PI_2);
+            CGContextTranslateCTM(context, -imageSize.height, 0);
+        } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
+            CGContextRotateCTM(context, M_PI);
+            CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
+        }
+        if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
+        {
+            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
+        }
+        else
+        {
+            [window.layer renderInContext:context];
+        }
+        CGContextRestoreGState(context);
+    }
+    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+    return image;
+}
+
+- (void)cancelListen {
+    [[NSNotificationCenter defaultCenter] removeObserver:self
+                                                    name:UIApplicationUserDidTakeScreenshotNotification
+                                                  object:nil];
+}
+
+- (void)dealloc
+{
+    [self cancelListen];
+}
+
+
+@end

ios/hi_teacher_screenshot_listener.podspec

+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint hi_teacher_screenshot_listener.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name             = 'hi_teacher_screenshot_listener'
+  s.version          = '0.0.1'
+  s.summary          = 'A new Flutter project.'
+  s.description      = <<-DESC
+A new Flutter project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.public_header_files = 'Classes/**/*.h'
+  s.dependency 'Flutter'
+  s.platform = :ios, '9.0'
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
+end

lib/hi_teacher_screenshot_listener.dart

+
+import 'hi_teacher_screenshot_listener_platform_interface.dart';
+
+class HiTeacherScreenshotListener {
+  Future<String?> getPlatformVersion() {
+    return HiTeacherScreenshotListenerPlatform.instance.getPlatformVersion();
+  }
+
+  Future<Map> startListen() {
+    return HiTeacherScreenshotListenerPlatform.instance.startListen();
+  }
+
+  Stream<String?> getUserScreenshot() {
+    return HiTeacherScreenshotListenerPlatform.instance.getUserScreenshot();
+  }
+}

lib/hi_teacher_screenshot_listener_method_channel.dart

+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+import 'hi_teacher_screenshot_listener_platform_interface.dart';
+
+/// An implementation of [HiTeacherScreenshotListenerPlatform] that uses method channels.
+class MethodChannelHiTeacherScreenshotListener extends HiTeacherScreenshotListenerPlatform {
+  static const methodChannelName = 'dev.hiteacher.screenshot_listener/bridge';
+  static const screenshotChannelName = 'dev.hiteacher.screenshot_listener/listener';
+
+  @visibleForTesting
+  static const methodChannel = MethodChannel(methodChannelName);
+
+  static const screenshotChannel = EventChannel(screenshotChannelName);
+
+  @override
+  Future<String?> getPlatformVersion() async {
+    final version = await methodChannel.invokeMethod<String>('getPlatformVersion');
+    return version;
+  }
+
+  @override
+  Future<Map<String, Object>> startListen() async {
+    final result = await methodChannel.invokeMethod('start');
+    Map<String, Object> obj = {
+      "success" : result["success"],
+      "message" : result["message"],
+    };
+    return obj;
+  }
+
+  @override
+  Stream<String?> getUserScreenshot() {
+    return screenshotChannel.receiveBroadcastStream().map((event) => event);
+  }
+}

lib/hi_teacher_screenshot_listener_platform_interface.dart

+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+import 'hi_teacher_screenshot_listener_method_channel.dart';
+
+abstract class HiTeacherScreenshotListenerPlatform extends PlatformInterface {
+  /// Constructs a HiTeacherScreenshotListenerPlatform.
+  HiTeacherScreenshotListenerPlatform() : super(token: _token);
+
+  static final Object _token = Object();
+
+  static HiTeacherScreenshotListenerPlatform _instance = MethodChannelHiTeacherScreenshotListener();
+
+  /// The default instance of [HiTeacherScreenshotListenerPlatform] to use.
+  ///
+  /// Defaults to [MethodChannelHiTeacherScreenshotListener].
+  static HiTeacherScreenshotListenerPlatform get instance => _instance;
+
+  /// Platform-specific implementations should set this with their own
+  /// platform-specific class that extends [HiTeacherScreenshotListenerPlatform] when
+  /// they register themselves.
+  static set instance(HiTeacherScreenshotListenerPlatform instance) {
+    PlatformInterface.verifyToken(instance, _token);
+    _instance = instance;
+  }
+
+  Future<String?> getPlatformVersion() {
+    throw UnimplementedError('platformVersion() has not been implemented.');
+  }
+
+  Future<Map> startListen() {
+    throw UnimplementedError('startScreenshotListener() has not been implemented.');
+  }
+
+  Stream<String?> getUserScreenshot() {
+    throw UnimplementedError('userScreenshot() has not been implemented.');
+  }
+}

pubspec.yaml

+name: hi_teacher_screenshot_listener
+description: A new Flutter project.
+version: 0.0.1
+homepage:
+
+environment:
+  sdk: '>=2.19.6 <3.0.0'
+  flutter: ">=2.5.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  plugin_platform_interface: ^2.0.2
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^2.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+  # This section identifies this Flutter project as a plugin project.
+  # The 'pluginClass' specifies the class (in Java, Kotlin, Swift, Objective-C, etc.)
+  # which should be registered in the plugin registry. This is required for
+  # using method channels.
+  # The Android 'package' specifies package in which the registered class is.
+  # This is required for using method channels on Android.
+  # The 'ffiPlugin' specifies that native code should be built and bundled.
+  # This is required for using `dart:ffi`.
+  # All these are used by the tooling to maintain consistency when
+  # adding or updating assets for this project.
+  plugin:
+    platforms:
+      android:
+        package: com.example.hi_teacher_screenshot_listener
+        pluginClass: HiTeacherScreenshotListenerPlugin
+      ios:
+        pluginClass: HiTeacherScreenshotListenerPlugin
+
+  # To add assets to your plugin package, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+  #
+  # For details regarding assets in packages, see
+  # https://flutter.dev/assets-and-images/#from-packages
+  #
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware
+
+  # To add custom fonts to your plugin package, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts in packages, see
+  # https://flutter.dev/custom-fonts/#from-packages

test/hi_teacher_screenshot_listener_method_channel_test.dart

+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hi_teacher_screenshot_listener/hi_teacher_screenshot_listener_method_channel.dart';
+
+void main() {
+  MethodChannelHiTeacherScreenshotListener platform = MethodChannelHiTeacherScreenshotListener();
+  const MethodChannel channel = MethodChannel('hi_teacher_screenshot_listener');
+
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  setUp(() {
+    channel.setMockMethodCallHandler((MethodCall methodCall) async {
+      return '42';
+    });
+  });
+
+  tearDown(() {
+    channel.setMockMethodCallHandler(null);
+  });
+
+  test('getPlatformVersion', () async {
+    expect(await platform.getPlatformVersion(), '42');
+  });
+}

test/hi_teacher_screenshot_listener_test.dart

+import 'package:flutter_test/flutter_test.dart';
+import 'package:hi_teacher_screenshot_listener/hi_teacher_screenshot_listener.dart';
+import 'package:hi_teacher_screenshot_listener/hi_teacher_screenshot_listener_platform_interface.dart';
+import 'package:hi_teacher_screenshot_listener/hi_teacher_screenshot_listener_method_channel.dart';
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+class MockHiTeacherScreenshotListenerPlatform
+    with MockPlatformInterfaceMixin
+    implements HiTeacherScreenshotListenerPlatform {
+
+  @override
+  Future<String?> getPlatformVersion() => Future.value('42');
+
+  @override
+  Stream<String?> getUserScreenshot() {
+    // TODO: implement getUserScreenshot
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<Map> startListen() {
+    // TODO: implement startListen
+    throw UnimplementedError();
+  }
+}
+
+void main() {
+  final HiTeacherScreenshotListenerPlatform initialPlatform = HiTeacherScreenshotListenerPlatform.instance;
+
+  test('$MethodChannelHiTeacherScreenshotListener is the default instance', () {
+    expect(initialPlatform, isInstanceOf<MethodChannelHiTeacherScreenshotListener>());
+  });
+
+  test('getPlatformVersion', () async {
+    HiTeacherScreenshotListener hiTeacherScreenshotListenerPlugin = HiTeacherScreenshotListener();
+    MockHiTeacherScreenshotListenerPlatform fakePlatform = MockHiTeacherScreenshotListenerPlatform();
+    HiTeacherScreenshotListenerPlatform.instance = fakePlatform;
+
+    expect(await hiTeacherScreenshotListenerPlugin.getPlatformVersion(), '42');
+  });
+}