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();
  }
  
 }
}