android pip is compatible with multi flutter engine

Flutter/android/src/main/java/com/tencent/vod/flutter/SuperPlayerPlugin.java

@@ -94,6 +94,7 @@ public class SuperPlayerPlugin implements FlutterPlugin, MethodCallHandler, Acti
 
     @Override
     public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {
+        Log.i(TAG, "onAttachedToEngine");
         mFlutterPluginBinding = flutterPluginBinding;
         channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), "flutter_super_player");
         channel.setMethodCallHandler(this);
@@ -309,6 +310,7 @@ public class SuperPlayerPlugin implements FlutterPlugin, MethodCallHandler, Acti
 
     @Override
     public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
+        Log.i(TAG, "onAttachedToEngine");
         channel.setMethodCallHandler(null);
         mFTXDownloadManager.destroy();
         mFlutterPluginBinding = null;

Flutter/android/src/main/java/com/tencent/vod/flutter/ui/FlutterPipImplActivity.java

@@ -2,6 +2,7 @@
 
 package com.tencent.vod.flutter.ui;
 
+import android.app.Activity;
 import android.app.PictureInPictureParams;
 import android.app.PictureInPictureUiState;
 import android.content.BroadcastReceiver;
@@ -36,9 +37,8 @@ import com.tencent.vod.flutter.FTXPIPManager.PipParams;
 import com.tencent.vod.flutter.R;
 import com.tencent.vod.flutter.model.PipResult;
 import com.tencent.vod.flutter.model.VideoModel;
-import io.flutter.embedding.android.FlutterActivity;
 
-public class FlutterPipImplActivity extends FlutterActivity implements Callback, ITXVodPlayListener,
+public class FlutterPipImplActivity extends Activity implements Callback, ITXVodPlayListener,
         ITXLivePlayListener, ServiceConnection {
 
     private static final String TAG = "FlutterPipImplActivity";