Android通过摇晃手机的频率来控制声音的频率

通过晃动手机的频率来修改播放声音的频率。效果很给力的说。主要通过sensor来算手机摇晃的频率，摇晃的频率越高，播放声音的速度越快。
 
  1 /**
  2  * @author Stay
  3  *        通过摇晃手机的频率来改变声音的速度
  4  */
  5  public class ShakeSound extends Activity implements SensorEventListener,OnClickListener {
  6     private static final float SHAKE_THRESHOLD = 50;
  7     private static final String TAG = "ActivityTest";
  8     private SensorManager manager;
  9     private SoundManager sm;
 10     private long curTime, lastUpdate;
 11     private float last_x, last_y, last_z;
 12     private float x,y,z;
 13     private boolean isPlaying;
 14     private int count = -2;
 15     private float force;
 16     private int audioCount = 0;
 17     private float audioForce;
 18     private Button btn;
 19
 20     @Override
 21     protected void onCreate(Bundle savedInstanceState) {
 22         super.onCreate(savedInstanceState);
 23         setContentView(R.layout.main);
 24         btn = (Button) this.findViewById(R.id.hello);
 25         btn.setOnClickListener(this);
 26         manager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
 27         sm = new SoundManager(this);
 28         sm.addSound(1, "heixiu.ogg");
 29     }
 30
 31     @Override
 32     public void onSensorChanged(SensorEvent event) {
 33         curTime = System.currentTimeMillis();
 34         if ((curTime - lastUpdate) > 100) {
 35             count ++ ;
 36             if (count < 0) {
 37                 return;
 38             }
 39             if (count == 0) {