Android-类似微信和米聊中摇一摇找好友的功能的实现

要实现该功能，主要借助于重力感应

public class TestSensorActivity extends Activity implements SensorEventListener {                private SensorManager manager;        private Vibrator vibrator;        private TextView xSensor,ySensor,zSensor;        private float X = 0.0f;        private float Y = 0.0f;        private float Z = 0.0f;        private Button button1,button2;        private TextView textView;        private Animation animation ,animation2 ;        private FrameLayout layout;        private ImageView imageView;        private String[] strs;                private Handler handler = new Handler(){            @Override            public void handleMessage(Message msg) {                // TODO Auto-generated method stub                super.handleMessage(msg);                switch (msg.what) {                case 0:                    textView.setText((String)msg.obj);                    imageView.startAnimation(animation);                    textView.startAnimation(animation);                    break;                                    }            }                    };        private int i = 0;        /** Called when the activity is first created. */        @Override        public void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.main);            manager = (SensorManager) getSystemService(SENSOR_SERVICE);  //首先得到传感器管理器对象            vibrator = (Vibrator) getSystemService(Service.VIBRATOR_SERVICE);                            }        @Override        protected void onResume() {            // TODO Auto-generated method stub            super.onResume(); //注册监听器            manager.registerListener(this, manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), manager.SENSOR_DELAY_NORMAL);                      //第一个参数是Listener，第二个参数是所得传感器类型，第三个参数值获取传感器信息的频率        }            @Override        protected void onStop() {            // TODO Auto-generated method stub            super.onStop();            manager.unregisterListener(this);//解绑定Listener        }            @Override        public void onAccuracyChanged(Sensor sensor, int accuracy) {            // TODO Auto-generated method stub        }            @Override        public void onSensorChanged(SensorEvent event) {            // TODO Auto-generated method stub            //传感器信息改变时执行该方法            float[] values = event.values;            float x = values[0]; //x轴方向的重力加速度，向右为正            float y = values[1]; // y轴方向的重力加速度，向前为正            float z = values[2]; // z轴方向的重力加速度，向上为正            if(x>40 || x<-40 || y>40 || y<-40 || z>40 || z<-40){                //一般在这三个方向的重力加速度达到40就达到了摇晃手机的状态。当然这个值可以根据需要，自己定义。                vibrator.vibrate(200);                int random = getRandom();                Message msg = new Message();                msg.what = 0;                msg.obj = strs[random];                handler.sendMessage(msg);            }           }    }