Question

I am developing an android application whose one feature is to lock screen orientation to Landscape , I want to apply this orientation change to all the android application in phone . I am using this code

private void lockScreenOrientation() {
if (!mScreenOrientationLocked) {
    final int orientation = getResources().getConfiguration().orientation;
    final int rotation = getWindowManager().getDefaultDisplay().getOrientation();
    if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_90) {
        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }
        else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        }
    }
    else if (rotation == Surface.ROTATION_180 || rotation == Surface.ROTATION_270) {
        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
        }
        else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
        }
    }

    mScreenOrientationLocked = true;
}
}

private void unlockScreenOrientation() {
 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
 mScreenOrientationLocked = false;
}

But this is temporary change , doesnt take effect to all application , does anyone know a way to apply lock orientation to all applications ? Thank you

Answer 1

Applications like the one you have linked do this by modifying the global system settings values associated with rotation. Have a look at the Settings.System class for the constants available to applications. Specifically, the ACCELEROMETER_ROTATION and USER_ROTATION values will probably be of interest.

You will also need to declare the android.permission.WRITE_SETTINGS and possibly the android.permission.WRITE_SECURE_SETTINGS permissions in your manifest.