private OrientationEventListener mOrientationListener;    private String TAG = "MainActivity";    private int screenCurOrient = 2; //1表示正竖屏，2表示正横屏，3表示反竖屏，4表示反横屏    private final void startOrientationChangeListener() {        mOrientationListener = new OrientationEventListener(this) {            @Override            public void onOrientationChanged(int rotation) {                //判断四个方向                if (rotation == -1) {                    Log.d(TAG, "手机平放:" + rotation);                } else if (rotation < 10 || rotation > 350) {                    screenOrientChange(1);                } else if (rotation < 100 && rotation > 80) {                    screenOrientChange(4);                } else if (rotation < 190 && rotation > 170) {                    screenOrientChange(3);                } else if (rotation < 280 && rotation > 260) {                    screenOrientChange(2);                }                else                {                }            }        };        mOrientationListener.enable();    }    private void screenOrientChange(int Orient)    {        if(Orient != screenCurOrient)        {            screenCurOrient = Orient;            switch (screenCurOrient)            {                case 1:                    Log.d(TAG, "正竖屏:");                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);                    break;                case 2:                    Log.d(TAG, "正横屏:");                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);                    break;                case 3:                    Log.d(TAG, "反竖屏:");                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);                    break;                case 4:                    Log.d(TAG, "反横屏:");                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);                    break;            }        }    } 在onCreate方法中调用startOrientationChangeListener方法即可。