Revert "测试"

This reverts commit 80a8fab891.

android/src/main/java/io/openim/flutter_openim_sdk/FlutterOpenimSdkPlugin.java

@@ -63,16 +63,12 @@ public class FlutterOpenimSdkPlugin implements FlutterPlugin, MethodCallHandler,
 
     @Override
     public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {
-        if(isInitialized){
-            return;
-        }
         channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), CHANNEL_NAME);
         context = flutterPluginBinding.getApplicationContext();
         channel.setMethodCallHandler(this);
         connectivityListener = new ConnectivityListener(context);
         visibilityListener = new VisibilityListener();
         connectivityListener.register();
-        isInitialized = true;
     }
 
     @Override