重力感应器控制屏幕横竖屏

工具类:

public class ScreenSwitchUtils {private static ScreenSwitchUtils mInstance;private static Object lock = new Object();private OrientationSensorListener listener;private SensorManager sm;private Sensor sensor;private Activity mActivity;private  static final int ORIENTATION_SUCCESS = 1;private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);if (msg.what == ORIENTATION_SUCCESS) {int orientation = msg.arg1;if (orientation > 45 && orientation < 135) {mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);} else if (orientation > 135 && orientation < 225) {mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);} else if (orientation > 225 && orientation < 315) {mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);} else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}}}};public ScreenSwitchUtils(Context context) {sm = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);listener = new OrientationSensorListener(handler);sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);}public static ScreenSwitchUtils newInstance(Context context) {if (mInstance == null) {synchronized (lock) {if (mInstance == null) {mInstance = new ScreenSwitchUtils(context);}}}return mInstance;}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) {// TODO Auto-generated method stub}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 valueif (magnitude * 4 >= Z * Z) {float OneEightyOverPi = 57.29577957855f;float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;orientation = 90 - (int) Math.round(angle);// normalize to 0 - 359 rangewhile (orientation >= 360) {orientation -= 360;}while (orientation < 0) {orientation += 360;}}if (rotateHandler != null) {rotateHandler.obtainMessage(ORIENTATION_SUCCESS, orientation, 0).sendToTarget();}}}/*** 开始监听*/public void start(Activity activity) {mActivity = activity;sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);}/*** 停止监听*/public void stop() {sm.unregisterListener(listener);}}

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调用:

public class MainActivity extends AppCompatActivity {private  ScreenSwitchUtils mScreenSwitchUtils;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mScreenSwitchUtils = ScreenSwitchUtils.newInstance(this);}@Overrideprotected void onResume() {super.onResume();mScreenSwitchUtils.start(this);}@Overrideprotected void onPause() {super.onPause();mScreenSwitchUtils.stop();}
}

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清单文件在Activity中添加:

 android:configChanges="orientation|keyboard"

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