1.获取传感器实例
SensorManager mSensorManager;
Sensor sensor;
ChangeOrientationHandler mHandler;
OrientationSensorListener listener;
mHandler = new ChangeOrientationHandler(this);
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
listener = new OrientationSensorListener(mHandler);
mSensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);
@Override
protected void onPause() {
mSensorManager.unregisterListener(listener);
super.onPause();
}
2.OrientationSensorListener监听 传感器数据的变化
按顺时针方向旋转手机,orientation增加过程为 0-90-180-270-360(0)
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 value
if (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 range
while (orientation >= 360) {
orientation -= 360;
}
while (orientation < 0) {
orientation += 360;
}
}
if (rotateHandler != null) {
rotateHandler.obtainMessage(888, orientation, 0).sendToTarget();
}
}
}
3.ChangeOrientationHandler 实现横竖屏的切换
public class ChangeOrientationHandler extends Handler {
private Activity activity;
public ChangeOrientationHandler(Activity ac) {
super();
activity = ac;
}
@Override
public void handleMessage(Message msg) {
if (msg.what == 888) {
int orientation = msg.arg1;
Log.e("orientation",orientation+"");
if (orientation > 45 && orientation < 135) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
// Log.d(MainActivity.TAG, "横屏翻转: ");
} else if (orientation > 135 && orientation < 225) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
// Log.d(MainActivity.TAG, "竖屏翻转: ");
} else if (orientation > 225 && orientation < 315) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
// Log.d(MainActivity.TAG, "横屏: ");
} else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// Log.d(MainActivity.TAG, "竖屏: ");
}
}
super.handleMessage(msg);
}
}