public class ScreenSwitchUtils {        private static final String TAG = ScreenSwitchUtils.class.getSimpleName();        private volatile static ScreenSwitchUtils mInstance;        private Activity mActivity;        // 是否是竖屏    private boolean isPortrait = true;        private SensorManager sm;    private OrientationSensorListener listener;    private Sensor sensor;    private SensorManager sm1;    private Sensor sensor1;    private OrientationSensorListener1 listener1;        private Handler mHandler = new Handler() {        public void handleMessage(Message msg) {            switch (msg.what) {            case 888:                int orientation = msg.arg1;                if (orientation > 45 && orientation < 135) {                } else if (orientation > 135 && orientation < 225) {                } else if (orientation > 225 && orientation < 315) {                    if (isPortrait) {                        Log.e(test, 切换成横屏);                        mActivity.setRequestedOrientation(0);                        isPortrait = false;                    }                } else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {                    if (!isPortrait) {                        Log.e(test,切换成竖屏);                        mActivity.setRequestedOrientation(1);                        isPortrait = true;                    }                }                break;            default:                break;            }        };    };        /** 返回ScreenSwitchUtils单例 **/    public static ScreenSwitchUtils init(Context context) {        if (mInstance == null) {            synchronized (ScreenSwitchUtils.class) {                if (mInstance == null) {                    mInstance = new ScreenSwitchUtils(context);                }            }        }        return mInstance;    }    private ScreenSwitchUtils(Context context) {        Log.d(TAG, init orientation listener.);        // 注册重力感应器,监听屏幕旋转        sm = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);        sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);        listener = new OrientationSensorListener(mHandler);        // 根据 旋转之后/点击全屏之后 两者方向一致,激活sm.        sm1 = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);        sensor1 = sm1.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);        listener1 = new OrientationSensorListener1();    }        /** 开始监听 */    public void start(Activity activity) {        Log.d(TAG, start orientation listener.);        mActivity = activity;        sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);    }    /** 停止监听 */    public void stop() {        Log.d(TAG, stop orientation listener.);        sm.unregisterListener(listener);        sm1.unregisterListener(listener1);    }        /**     * 手动横竖屏切换方向     */    public void toggleScreen() {        sm.unregisterListener(listener);        sm1.registerListener(listener1, sensor1,SensorManager.SENSOR_DELAY_UI);        if (isPortrait) {            isPortrait = false;            // 切换成横屏            mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);        } else {            isPortrait = true;            // 切换成竖屏            mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);        }    }        public boolean isPortrait(){        return this.isPortrait;    }        /**     * 重力感应监听者     */    public class OrientationSensorListener implements SensorEventListener {        private static final int _DATA_X = 0;        private static final int _DATA_Y = 1;        private static final int _DATA_Z = 2;        public static final int ORIENTATION_UNKNOWN = -1;        private Handler rotateHandler;        public OrientationSensorListener(Handler handler) {            rotateHandler = handler;        }        public void onAccuracyChanged(Sensor arg0, int arg1) {        }        public void onSensorChanged(SensorEvent event) {            float[] values = event.values;            int orientation = ORIENTATION_UNKNOWN;            float X = -values[_DATA_X];            float Y = -values[_DATA_Y];            float Z = -values[_DATA_Z];            float magnitude = X * X + Y * Y;            // Don‘t trust the angle if the magnitude is small compared to the y            // value            if (magnitude * 4 >= Z * Z) {                // 屏幕旋转时                float OneEightyOverPi = 57.29577957855f;                float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;                orientation = 90 - (int) Math.round(angle);                // normalize to 0 - 359 range                while (orientation >= 360) {                    orientation -= 360;                }                while (orientation < 0) {                    orientation += 360;                }            }            if (rotateHandler != null) {                rotateHandler.obtainMessage(888, orientation, 0).sendToTarget();            }        }    }    public class OrientationSensorListener1 implements SensorEventListener {        private static final int _DATA_X = 0;        private static final int _DATA_Y = 1;        private static final int _DATA_Z = 2;        public static final int ORIENTATION_UNKNOWN = -1;        public OrientationSensorListener1() {        }        public void onAccuracyChanged(Sensor arg0, int arg1) {        }        public void onSensorChanged(SensorEvent event) {            float[] values = event.values;            int orientation = ORIENTATION_UNKNOWN;            float X = -values[_DATA_X];            float Y = -values[_DATA_Y];            float Z = -values[_DATA_Z];            float magnitude = X * X + Y * Y;            // Don‘t trust the angle if the magnitude is small compared to the y            // value            if (magnitude * 4 >= Z * Z) {                // 屏幕旋转时                float OneEightyOverPi = 57.29577957855f;                float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;                orientation = 90 - (int) Math.round(angle);                // normalize to 0 - 359 range                while (orientation >= 360) {                    orientation -= 360;                }                while (orientation < 0) {                    orientation += 360;                }            }            if (orientation > 225 && orientation < 315) {// 检测到当前实际是横屏                if (!isPortrait) {                    sm.registerListener(listener, sensor,SensorManager.SENSOR_DELAY_UI);                    sm1.unregisterListener(listener1);                }            } else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {// 检测到当前实际是竖屏                if (isPortrait) {                    sm.registerListener(listener, sensor,SensorManager.SENSOR_DELAY_UI);                    sm1.unregisterListener(listener1);                }            }        }    }}转载请标明出处：http://blog.csdn.net/goldenfish1919/article/details/47423131使用的时候： public class MainActivity extends Activity implements OnClickListener {    private ScreenSwitchUtils instance;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        instance = ScreenSwitchUtils.init(this.getApplicationContext());    }    @Override    protected void onStart() {        super.onStart();        instance.start(this);    }    @Override    protected void onStop() {        super.onStop();        instance.stop();    }    @SuppressLint(NewApi)    @Override    public void onConfigurationChanged(Configuration newConfig) {        super.onConfigurationChanged(newConfig);        Log.e(test, onConfigurationChanged);        if (instance.isPortrait()) {            // 切换成竖屏            LayoutParams params1 = new RelativeLayout.LayoutParams(screenWidth, DensityUtil.dip2px(this, 160));            videoView.setLayoutParams(params1);            Toast.makeText(getApplicationContext(), 竖屏, 0).show();            Log.e(test, 竖屏);        } else {            // 切换成横屏            LayoutParams params1 = new RelativeLayout.LayoutParams(screenHeight, screenWidth);            videoView.setLayoutParams(params1);            Toast.makeText(getApplicationContext(), 横屏, 0).show();            Log.e(test, 横屏);        }    }    @Override    public void onClick(View arg0) {        switch (arg0.getId()) {        case R.id.iv_stretch:            instance.toggleScreen();            break;        }    }}