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

    package yyy.testsensor;                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);                }               }        }