Android屏幕重力感應旋轉

 

public class MainActivity extends AppCompatActivity {

　　private MyOrientoinListener myOrientoinListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myOrientoinListener = new MyOrientoinListener(this);
        boolean autoRotateOn = (android.provider.Settings.System.getInt(getContentResolver(), Settings.System.ACCELEROMETER_ROTATION, 0) == 1);
        //檢查系統是否開啓自動旋轉
        if (autoRotateOn) {
            myOrientoinListener.enable();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //銷燬時取消監聽
        myOrientoinListener.disable();
    }

    class MyOrientoinListener extends OrientationEventListener {
        public MyOrientoinListener(Context context) {
        super(context);
    }

    public MyOrientoinListener(Context context, int rate) {
        super(context, rate);
    }

    @Override
    public void onOrientationChanged(int orientation) {
        int screenOrientation = getResources().getConfiguration().orientation;

        if (((orientation >= 0) && (orientation < 45)) || (orientation > 315)) {    //設置豎屏
            if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_PORTRAIT && orientation != ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT) {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            }
        } else if (orientation > 225 && orientation < 315) { //設置橫屏
            if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            }
        } else if (orientation > 45 && orientation < 135) {// 設置反向橫屏
            if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE) {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
            }
        } else if (orientation > 135 && orientation < 225) { //反向豎屏
            if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT) {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
            }
        }
    }
}