Android 屏幕旋转 Sensor SensorManager

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;

@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;
    }
}

}
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;
}

}

Android 屏幕旋转 Sensor SensorManager

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