Android实现摇一摇功能

　　都是一些简单的代码布局：<?xml version=＂1.0＂ encoding=＂utf-8＂?>         代码：package main.beini.com.shakeapp;  import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.Toast;  public class MainActivity extends AppCompatActivity {    private ShakeListener mShakeListener = null;     @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);       mShakeListener = new ShakeListener(this);       mShakeListener.setOnShakeListener(new shakeLitener());    }     @Override    protected void onDestroy() {       super.onDestroy();       mShakeListener.stop();    }     private class shakeLitener implements ShakeListener.OnShakeListener {        @Override       public void onShake() { //       Animation.startAnim(GamesActivity.this, findViewById(R.id.game_bg_2), findViewById(R.id.game_bg_3));          Toast.makeText(MainActivity.this, ＂摇一摇＂, Toast.LENGTH_SHORT).show();       }    } }
　　package main.beini.com.shakeapp;  import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager;  public class ShakeListener implements SensorEventListener {     String TAG = ＂ShakeListener＂;     // 速度阈值，当摇晃速度达到这值后产生作用       private static final int SPEED_SHRESHOLD = 5000;     // 两次检测的时间间隔       private static final int UPTATE_INTERVAL_TIME = 70;      // 传感器管理器       private SensorManager sensorManager;     // 传感器       private Sensor sensor;     // 重力感应监听器       private OnShakeListener onShakeListener;      // 上下文       private Context mContext;     // 手机上一个位置时重力感应坐标       private float lastX;      private float lastY;      private float lastZ;      // 上次检测时间       private long lastUpdateTime;      // 构造器       public ShakeListener(Context c) {      // 获得监听对象        mContext = c;       start();      }      // 开始       public void start() {       // 获得传感器管理器        sensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);      if (sensorManager != null) {        // 获得重力传感器         sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);      }       // 注册        if (sensor != null) {        sensorManager.registerListener(this, sensor,        SensorManager.SENSOR_DELAY_GAME);      }      }      // 停止检测       public void stop() {       sensorManager.unregisterListener(this);      }      // 设置重力感应监听器       public void setOnShakeListener(OnShakeListener listener) {       onShakeListener = listener;      }      // 重力感应器感应获得变化数据       public void onSensorChanged(SensorEvent event) {         // 现在检测时间           long currentUpdateTime = System.currentTimeMillis();         // 两次检测的时间间隔           long timeInterval = currentUpdateTime - lastUpdateTime;          // 判断是否达到了检测时间间隔           if (timeInterval < UPTATE_INTERVAL_TIME)           return;          // 现在的时间变成last时间           lastUpdateTime = currentUpdateTime;          // 获得x,y,z坐标           float x = event.values[0];          float y = event.values[1];          float z = event.values[2];          // 获得x,y,z的变化值           float deltaX = x - lastX;          float deltaY = y - lastY;          float deltaZ = z - lastZ;          // 将现在的坐标变成last坐标           lastX = x;          lastY = y;          lastZ = z;          double speed = Math.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ         * deltaZ) / timeInterval * 10000;              // 达到速度阀值，发出提示              if (speed >= SPEED_SHRESHOLD) {              onShakeListener.onShake();             }      }              public void onAccuracyChanged(Sensor sensor, int accuracy) {     }      // 摇晃监听接口       public interface OnShakeListener {       public void onShake();      }   }