Android 屏幕旋转 Sensor SensorManager

来源：互联网发布：男生丁丁知乎编辑：程序博客网时间：2024/05/22 02:03

在播放视频的时候，可能要做横竖屏的切换，虽然在manifest里面可以设置屏幕的方向根据重力感应来旋转，但这样是不行的。有时候用户可以设置自己的手机关掉屏幕旋转，这样也不行，所以得使用加速传感器或者OrientationEventListener

1、这是用加速传感器来实现：

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);            }        }    }}

}
使用的时候：

public class MainActivity extends Activity implements OnClickListener {

private ScreenSwitchUtils instance;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    instance = ScreenSwitchUtils.init(this.getApplicationContext());}@Overrideprotected void onStart() {    super.onStart();    instance.start(this);}@Overrideprotected void onStop() {    super.onStop();    instance.stop();}@SuppressLint("NewApi")@Overridepublic 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");    }}@Overridepublic void onClick(View arg0) {    switch (arg0.getId()) {    case R.id.iv_stretch:        instance.toggleScreen();        break;    }}

}
调用了activity.setRequestedOrientation()以后，会触发activity.onConfigurationChanged();可以在这里面重新设置播放界面的大小。

2.还有一种更简单的方式OrientationEventListener：

public class ScreenOrientationUtil {

private int mOrientation;private OrientationEventListener mOrEventListener;private int mOrientation1;private OrientationEventListener mOrEventListener1;private Activity mActivity;private static ScreenOrientationUtil instance = new ScreenOrientationUtil();public static ScreenOrientationUtil getInstance(){    return instance;} public void start(Activity activity){    this.mActivity = activity;    if(mOrEventListener == null){        initListener();    }    mOrEventListener.enable();}public void stop(){    if(mOrEventListener != null){        mOrEventListener.disable();    }    if(mOrEventListener1 != null){        mOrEventListener1.disable();    }}private void initListener(){    mOrEventListener = new OrientationEventListener(mActivity) {        @Override        public void onOrientationChanged(int rotation) {            Log.e("test", ""+rotation);            if (rotation == OrientationEventListener.ORIENTATION_UNKNOWN) {                return;            }            int orientation = convert2Orientation(rotation);            // 方向没有变化,跳过            if (orientation == mOrientation) {                return;            }            mOrientation = orientation;            mActivity.setRequestedOrientation(mOrientation);        }    };    mOrEventListener1 = new OrientationEventListener(mActivity) {        @Override        public void onOrientationChanged(int rotation) {            if (rotation == OrientationEventListener.ORIENTATION_UNKNOWN) {                return;            }            int orientation = convert2Orientation(rotation);            // 方向没有变化,跳过            if (orientation == mOrientation1) {                return;            }            mOrientation1 = orientation;            if(mOrientation1 == mOrientation){                mOrEventListener1.disable();                mOrEventListener.enable();            }        }    };}public boolean isPortrait(){    if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT || mOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT){        return true;    }    return false;}public int getOrientation(){    return mOrientation;}public void toggleScreen(){    mOrEventListener.disable();    mOrEventListener1.enable();    int orientation = 0 ;    if(mOrientation ==  ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){        orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;    }else if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){        orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;    }else if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE){        orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;    }else if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT){        orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;    }    mOrientation = orientation;    mActivity.setRequestedOrientation(mOrientation);}private int convert2Orientation(int rotation){    int orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;    if (((rotation >= 0) && (rotation <= 45)) || (rotation > 315)) {        orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;    } else if ((rotation > 45) && (rotation <= 135)) {        orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;    } else if ((rotation > 135) && (rotation <= 225)) {        orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;    } else if ((rotation > 225) && (rotation <= 315)) {        orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;    } else {        orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;    }    return orientation;}

}

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