android - How to detect screen rotation through 180 degrees from landscape to landscape orientation?

Question

I've seen a few other questions similar to this but no answers.

Rotating from portrait to landscape (either direction) and back again, we get the helpful call to onConfigurationChanged().

However, when rotating from landscape to landscape (through 180 degrees) onConfigurationChanged() is not called.

I've seen mention of using OrientationEventListener but this seems flakey to me because you can rotate quickly around without triggering a display orientation change.

I've tried adding a layout change listener, but with no success.

So the question is, how to reliably detect such a change in landscape orientation?

Answer 1

OrientationEventlistener won't work when the device isn't rotating/moving.

I find display listener is a better way to detect the change.

     DisplayManager.DisplayListener mDisplayListener = new DisplayManager.DisplayListener() {
        @Override
        public void onDisplayAdded(int displayId) {
           android.util.Log.i(TAG, "Display #" + displayId + " added.");
        }

        @Override
        public void onDisplayChanged(int displayId) {
           android.util.Log.i(TAG, "Display #" + displayId + " changed.");
        }

        @Override
        public void onDisplayRemoved(int displayId) {
           android.util.Log.i(TAG, "Display #" + displayId + " removed.");
        }
     };
     DisplayManager displayManager = (DisplayManager) mContext.getSystemService(Context.DISPLAY_SERVICE);
     displayManager.registerDisplayListener(mDisplayListener, UIThreadHandler);