最近在做一個視訊客戶端專案，有一個功能是，視訊要實現自動旋轉功能，在這裡做一簡單的總結。實現起來很簡單，幾行程式碼就能夠搞定。

直接看程式碼

1、繼承OrientationEventListener類監聽手機的旋轉

這裡用到的是OrientationEventListener類，它是當手機螢幕旋轉時從SensorManger接受通知的助手類。新建一個類繼承OrientationEventListener，如下

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) {
            Log.d(TAG, "orention" + orientation);
            int
 
 screenOrientation = getResources().getConfiguration().orientation;
            if (((orientation >= 0) && (orientation < 45)) || (orientation > 315)) {//設定豎屏
                if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_PORTRAIT && orientation != ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT) {
                    Log.d(TAG, "設定豎屏"
 
);
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                    oriBtn.setText("豎屏");
                }
            } else if (orientation > 225 && orientation < 315) { //設定橫屏
                Log.d(TAG, "設定橫屏");
                if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                    oriBtn.setText("橫屏");
                }
            } else if (orientation > 45 && orientation < 135) {// 設定反向橫屏
                Log.d(TAG, "反向橫屏");
                if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
                    oriBtn.setText("反向橫屏");
                }
            } else if (orientation > 135 && orientation < 225) {
                Log.d(TAG, "反向豎屏");
                if (screenOrientation != ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT) {
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
                    oriBtn.setText("反向豎屏");
                }
            }
        }
    }

2、在Activity中開啟自動旋轉

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

3、Activity銷燬時在onDesotry裡取消監聽

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

這樣就實現了螢幕自動旋轉的功能了，很簡單有木有！