android “摇一摇” 代码实现

核心接口代码：

package com.hyxf.main;

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;
// 重力感应易做图
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);
}
// 设置重力感应易做图
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 inte易做图ce 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();
}

}
}

补充：移动开发 , Android ,