How can I globally force screen orientation in Android?

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I tried kagronick’s answer but couldn’t make it work. After messing around for a bit I eventually got it working using a system overlay window and removing the LayoutParams that I found were all unnecessary. Here’s my eventual solution:

orientationChanger = new LinearLayout(this);
// Using TYPE_SYSTEM_OVERLAY is crucial to make your window appear on top
// You'll need the permission android.permission.SYSTEM_ALERT_WINDOW
WindowManager.LayoutParams orientationLayout = new WindowManager.LayoutParams(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, 0, PixelFormat.RGBA_8888);
// Use whatever constant you need for your desired rotation
orientationLayout.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR;

// Optional: Replace "Context" with "Service" when used in a service
WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
wm.addView(orientationChanger, orientationLayout);
orientationChanger.setVisibility(View.VISIBLE);

You can see my success in the app I released based on this: Force Dock Rotation.

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