Adnroid: How switch between two activites by screen orientation

There are two activities: MainActivity and SecondActivity.

• MainActivity should be displayed in the portrait orientation
• SecondActivity should be displayed in the landscape orientation

We need such attributes in Manifest:

<activity
        android:name=".MainActivity"
        android:screenOrientation="fullSensor"
        android:configChanges="orientation|screenSize"
...
<activity
        android:name=".SecondActivity"
        android:screenOrientation="fullSensor"
...

MainActivity starts SecondActivity when the screen is rotated into LANDSCAPE:

import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
...
@Override
public void onConfigurationChanged(@NonNull Configuration newConfig) {
  super.onConfigurationChanged(newConfig);

  if (ORIENTATION_LANDSCAPE == newConfig.orientation) {
    startActivity(new Intent(this, SecondActivity.class));
  }
}

SecondActivity checks on create if current orientation is LANDSCAPE, otherwise it finishes:

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (ORIENTATION_PORTRAIT == getResources().getConfiguration().orientation) {
      finish();
      return;
    }

    setContentView(R.layout.second_activity);
    ...
  }

When attribute configChanges="orientation|screenSize" is not present - activity will be recreated on each screen rotation, otherwise - method onConfigurationChanged is called.

Example on Github