Android：方向传感器

public class MainActivity extends Activity {

private ImageView imageView;
private SensorManager manager;
private SensorListener listener = new SensorListener();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

imageView = (ImageView) this.findViewById(R.id.imageView);
imageView.setKeepScreenOn(true);
manager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
}

@Override
protected void onResume() {
Sensor sensor = manager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME);
super.onResume();
}

@Override
protected void onPause() {
manager.unregisterListener(listener);
super.onPause();
}

private final class SensorListener implements SensorEventListener{
private float predegree = 0;
public void onSensorChanged(SensorEvent event) {
float degree = event.values[0];//存放了方向值 90
RotateAnimation animation = new RotateAnimation(predegree, -degree,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
animation.setDuration(200);
imageView.startAnimation(animation);
predegree = -degree;
}

public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}

}

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