Android：方向传感器

来源：互联网发布：赛尔网络 ipv6项目编辑：程序博客网时间：2024/06/02 04:06

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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