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();

                }

        }

}