android “摇一摇” 代码实现

核心接口代码：

import android.content.Context;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.util.Log;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 = 3000; // 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;  Log.v(TAG, "===========log===================");  // 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(); }}

 

应用代码：

public class yaoAcitivity extends Activity { ShakeListener mShakeListener = null; private TextView tv; private ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) {  // TODO Auto-generated method stub  super.onCreate(savedInstanceState);  this.setContentView(R.layout.main);    tv=(TextView)this.findViewById(R.id.textView1);  iv=(ImageView)this.findViewById(R.id.imageView1);    mShakeListener = new ShakeListener(this);  mShakeListener.setOnShakeListener(new shakeLitener()); } private class shakeLitener implements OnShakeListener{  @Override  public void onShake() {   // TODO Auto-generated method stub   tv.setText("摇一摇成功啦！");   iv.setImageResource(R.drawable.attitude_laugh);   mShakeListener.stop();  }   }}