android腾讯微博吹一吹实现原理

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http://www.eoeandroid.com/thread-211137-1-1.html

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最近研究腾讯吹一吹，写了一个dome 贴出核心的线程代码，那么吹一吹的原理是什么呢？声音对就是声音.
1.当用户到吹一吹界面之后有一个核心的线程便开启一直在读取麦克风的声音信息.
2.当500毫秒以内或者读取的5次数据的平均值超过某一个值的时候则就可以触发吹一吹事件
3.通知界面，界面接受到之后响应响应的动画。
以下是线程的代码：

package com.bshark.letmessage.server;import android.media.AudioFormat;import android.media.AudioRecord;import android.media.MediaRecorder;import android.os.Bundle;import android.os.Message;import com.bshark.letmessage.ui.BlowActivity.MyHandler;import com.bshark.letmessage.util.Parameter;public class RecordThread extends Thread {        private AudioRecord ar;        private int bs = 100;        private static int SAMPLE_RATE_IN_HZ = 8000;        private Message msg;        private int number = 1;        private int tal = 1;        private MyHandler handler;        private long currenttime;        private long endtime;        private long time = 1;        //到达该值之后 触发事件        private static int BLOW_ACTIVI=2620;        public RecordThread(MyHandler myHandler) {                super();                bs = AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ,                                AudioFormat.CHANNEL_CONFIGURATION_MONO,                                AudioFormat.ENCODING_PCM_16BIT);                ar = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE_IN_HZ,                                AudioFormat.CHANNEL_CONFIGURATION_MONO,                                AudioFormat.ENCODING_PCM_16BIT, bs);                handler = myHandler;        }        @Override        public void run() {                try {                        ar.startRecording();                        Parameter.isblow = true;                        // 用于读取的 buffer                        byte[] buffer = new byte[bs];                        while (Parameter.isblow) {                                number++;                                sleep(8);                                currenttime = System.currentTimeMillis();                                int r = ar.read(buffer, 0, bs) + 1;                                int v = 0;                                for (int i = 0; i < buffer.length; i++) {                                        v += buffer * buffer;                                }                                int value = Integer.valueOf(v / (int) r);                                tal = tal + value;                                endtime = System.currentTimeMillis();                                time = time + (endtime - currenttime);                                                if (time >= 500 || number > 5) {                                        int total = tal / number;                                        if (total > BLOW_ACTIVI) {                                                //发送消息通知到界面 触发动画                                                                                                //利用传入的handler 给界面发送通知                                                //                                                number = 1;                                                tal = 1;                                                time = 1;                                        }                                }                        }                        ar.stop();                        ar.release();                        bs=100;                                        } catch (Exception e) {                        e.printStackTrace();                }        }}

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