how to keep app in landscape mode in flutter code example

Example 1: flutter lock orientation

@override
void initState(){
  super.initState();
  SystemChrome.setPreferredOrientations([
      DeviceOrientation.landscapeRight,
      DeviceOrientation.landscapeLeft,
  ]);
}

Example 2: lock screen orientation flutter

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.orientation_lock_example">    <application ...>        <activity            android:name=".MainActivity"            android:screenOrientation="portrait"            ...            />            ...         </activity>        ...     </application></manifest>