android音乐播放器开发 SweetMusicPlayer 摇一摇换歌

上一篇写了如何在线匹配歌词，http://blog.csdn.net/huweigoodboy/article/details/39878063，现在来讲讲摇一摇功能开发。

代码地址：https://github.com/huweigoodboy/SweetMusicPlayer

同样用了一个Service去实现摇一摇。

ShakeListener继承自SensorEventListener，当加速度感应器感受到重力变化，就去通知onShakeListener调用onShake(),

在震动的同时随机一首歌。

一，加速度感应器

在这里需要设置一个速度阈值和时间间隔，控制一定的时间间隔才能触发第二次震动，还有感受速度太小也不去onShake（）。

1)得到sensorManager。

sensorManager=(SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);

2）得到sensor

sensor=sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

3）注册感应监听

sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL);

package com.huwei.sweetmusicplayer.ui.listeners;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 {//速度阈值private static final int SPEED_SHAKEHOLD=3000;//检测时间间隔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;public ShakeListener(Context mContext) {super();this.mContext = mContext;start();}public void start(){sensorManager=(SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);if(sensorManager!=null){//获得加速度感应器sensor=sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);}if(sensor!=null){//注册加速器，并且设置速率sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL);}}// 设置重力感应监听器public void setOnShakeListener(OnShakeListener listener) {onShakeListener = listener;}public void stop(){sensorManager.unregisterListener(this);}//重力感应到变化@Overridepublic void onSensorChanged(SensorEvent event) {// TODO Auto-generated method stublong currentUpdateTime=System.currentTimeMillis();long timeInterval=currentUpdateTime-lastUpdateTime;if(timeInterval<UPTATE_INTERVAL_TIME){return;}lastUpdateTime=currentUpdateTime;float x=event.values[0];float y=event.values[1];float z=event.values[2];float deltaX=x-lastX;float deltaY=y-lastY;float deltaZ=z-lastZ;lastX=x;lastY=y;lastZ=z;double speed=Math.sqrt(deltaX*deltaX+deltaY*deltaY*deltaZ*deltaZ)/timeInterval*10000;if(speed>SPEED_SHAKEHOLD){onShakeListener.onShake();}}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {// TODO Auto-generated method stub}// 摇晃监听接口public interface OnShakeListener {public void onShake();}}

二，控制震动

得到Vibrator对象

vibrator=(Vibrator) getBaseContext().getSystemService(Context.VIBRATOR_SERVICE);

震动方法有两种

vibrator.vibrate(500);震动多少毫秒

或者设置一个震动周期的数组

vibrator.vibrate(new long[]{100,200,100,200}, -1); //停止，震动，停止，震动

-1表示重复次数为不重复

package com.huwei.sweetmusicplayer.services;import com.huwei.sweetmusicplayer.datamanager.MusicManager;
import com.huwei.sweetmusicplayer.ui.listeners.ShakeListener;import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.os.Vibrator;
import android.util.Log;public class ShakeService extends Service {private static final String TAG="ShakeService";private ShakeListener mShakeListener;private Vibrator vibrator;@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();vibrator=(Vibrator) getBaseContext().getSystemService(Context.VIBRATOR_SERVICE);mShakeListener=new ShakeListener(getBaseContext());mShakeListener.setOnShakeListener(new ShakeListener.OnShakeListener() {@Overridepublic void onShake() {// TODO Auto-generated method stubmShakeListener.stop();startVibrator();//vibrator.cancel();mShakeListener.start();}} );}//震动函数void startVibrator(){Log.i(TAG,"shake");vibrator.vibrate(500);MusicManager.getInstance().random_a_song();}@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {// TODO Auto-generated method stubmShakeListener.start();return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();mShakeListener.stop();}}