backToForeground doesn't work on Android about flutter_callkeep HOT 11 CLOSED

Future<void> displayIncomingCall(String handle) async {
    if (Platform.isIOS) {
      // iOS uses displayIncomingCall() 
      CallKit.displayIncomingCall(this.uuid, handle: handle, hasVideo: this.isVideoCall);
    } else {
      
      Map<String, dynamic> callData = {
        'yourAppId.yourAppId.CALL_ID': id,
        'yourAppId.yourAppId.CALL_UUID': this.uuid,
        'yourAppId.yourAppId.CALLER_HANDLE': handle,
      };

      if (DoneLifeCycleState.instance.isAppInForeground) {
        // if app in foreground, display the android activity for answering calls
        displayAndroidIncomingCallActivity(callData);
      } else {
        // display call notification if in background
        await _displayIncomingCallNotification(callData);
      }
    }
  }

Future<void> displayAndroidIncomingCallActivity(Map<String, dynamic> callData) async {
    MethodChannel _channel = MethodChannel('your.channel.id');
    String result = await _channel.invokeMethod('yourNativeAndroidMethodName', callData);
  }

Future<void> _displayIncomingCallNotification(Map<String, dynamic> callData) async {
    String incomingCallUsername = callData['your.app.id.CALLER_HANDLE'];
  displayIncomingCallNotification()
    await CallKeep.displayCustomIncomingCall(
      'your.app.id',
      'YourCustomAndroidActivityForIncomingCalls',
      icon: 'notification_icon',
      contentTitle: S().callNotificationTitle(incomingCallUsername),
      answerText: S().callAnswer,
      declineText: S().callDecline,
      extra: callData,
    );
  }

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="your.app.id">

    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
    <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_CALENDAR" />
    <uses-permission android:name="android.permission.WRITE_CALENDAR" />

    <application android:name=".Application" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:launchMode="singleTop" android:requestLegacyExternalStorage="true">

        <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id" />
        <meta-data android:name='com.facebook.sdk.AutoLogAppEventsEnabled' android:value='false' />
        <meta-data android:name="com.google.firebase.messaging.default_notification_icon" android:resource="@drawable/notification_icon" />
        <meta-data android:name="com.google.android.geo.API_KEY" android:value="yourKeyValue" />
        <activity android:name=".MainActivity" android:launchMode="singleTop" android:theme="@style/LaunchTheme" android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode" android:hardwareAccelerated="true" android:windowSoftInputMode="adjustResize">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data android:name="io.flutter.app.android.SplashScreenUntilFirstFrame" android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

        <activity android:name=".IncomingCallActivity" android:exported="true" android:showOnLockScreen="true" />
    </application>
</manifest>