public LegacySensorManager(SensorManager sensorManager) {
    mSensorManager = sensorManager;

    synchronized (SensorManager.class) {
        if (!sInitialized) {
            sWindowManager = IWindowManager.Stub.asInterface(
                    ServiceManager.getService("window"));
            if (sWindowManager != null) {
                // if it's null we're running in the system process
                // which won't get the rotated values
                try {
                    sRotation = sWindowManager.watchRotation(
                            new IRotationWatcher.Stub() {
                                public void onRotationChanged(int rotation) {
                                    LegacySensorManager.onRotationChanged(rotation);
                                }
                            }, DEFAULT_DISPLAY);
                } catch (RemoteException e) {
                }
            }
        }
    }
}
 

/** Register an {@link IRotationWatcher} with IWindowManager. */
protected static boolean watchRotations(IRotationWatcher watcher, final boolean watch) {
	// NOTE: removeRotationWatcher is only available on Android 4.3 (API 18) and 4.4 (API 19 & 20).
	final String methodName = ((watch) ? "watchRotation" : "removeRotationWatcher" );
	final IInterface mWM = getIWindowManager();
       if (null == mWM) return false;
       
       try {
           Method mMethod = mWM.getClass().getDeclaredMethod(
           	methodName, new Class[]{ IRotationWatcher.class });
           if (mMethod == null) return false;
           mMethod.setAccessible(true);
           mMethod.invoke(mWM, watcher);

           return true;
       } catch (Throwable t) {
           Log.e(TAG, "Cannot register " + IRotationWatcher.class.getSimpleName() , t);
           return false;
       }
}
 

/** Register an {@link IRotationWatcher} with IWindowManager. */
protected static boolean watchRotations(IRotationWatcher watcher, final boolean watch) {
	// NOTE: removeRotationWatcher is only available on Android 4.3 (API 18) and 4.4 (API 19 & 20).
	final String methodName = ((watch) ? "watchRotation" : "removeRotationWatcher" );
	final IInterface mWM = getIWindowManager();
       if (null == mWM) return false;
       
       try {
           Method mMethod = mWM.getClass().getDeclaredMethod(
           	methodName, new Class[]{ IRotationWatcher.class });
           if (mMethod == null) return false;
           mMethod.setAccessible(true);
           mMethod.invoke(mWM, watcher);

           return true;
       } catch (Throwable t) {
           Log.e(TAG, "Cannot register " + IRotationWatcher.class.getSimpleName() , t);
           return false;
       }
}
 

void setRotateListener(RotateListener listener) {
    try {
        Class<?> clazz = iWindowManager.getClass();

        IRotationWatcher watcher =
                new IRotationWatcher.Stub() {
                    @Override
                    public void onRotationChanged(int rotation) throws RemoteException {
                        if (listener != null) {
                            listener.onRotate(rotation);
                        }
                    }
                };

        try {
            clazz.getMethod("watchRotation", IRotationWatcher.class, int.class)
                    .invoke(iWindowManager, watcher, Display.DEFAULT_DISPLAY); // 26+

        } catch (NoSuchMethodException ex) {
            clazz.getMethod("watchRotation", IRotationWatcher.class)
                    .invoke(iWindowManager, watcher);
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}