通常来说，在进行android项目开发的时候可以通过mediarecorder和audiorecord这两个工具来实现录音的功能，mediarecorder直接把麦克风的数据存到文件，并且能够直接进行编码(如amr,mp3等)，而audiorecord则是读取麦克风的音频流。本文使用audiorecord读取音频流，使用audiotrack播放音频流，通过“边读边播放”以及增大音量的方式来实现一个简单的助听器程序。
此处需要注意：由于目前的android模拟器还不支持audiorecord，因此本程序需要编译之后放到真机运行。
先贴出本文程序运行截图：
另外还要注意：在本程序音量调节只是程序内部调节音量而已，要调到最大音量还需要手动设置系统音量。
使用audiorecord必须要申请许可，在androidmanifest.xml里面添加这句：
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<uses-permission android:name="android.permission.record_audio"></uses-permission>
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main.xml的源码如下：
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<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<button android:layout_height="wrap_content" android:id="@+id/btnrecord"
android:layout_width="fill_parent" android:text="开始边录边放"></button>
<button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:text="停止" android:id="@+id/btnstop"></button>
<button android:layout_height="wrap_content" android:id="@+id/btnexit"
android:layout_width="fill_parent" android:text="退出"></button>
<textview android:id="@+id/textview01" android:layout_height="wrap_content"
android:text="程序音量调节" android:layout_width="fill_parent"></textview>
<seekbar android:layout_height="wrap_content" android:id="@+id/skbvolume"
android:layout_width="fill_parent"></seekbar>
</linearlayout>
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testrecord.java的源码如下：
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package com.testrecord;
import android.app.activity;
import android.media.audioformat;
import android.media.audiomanager;
import android.media.audiorecord;
import android.media.audiotrack;
import android.media.mediarecorder;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.seekbar;
import android.widget.toast;
public class testrecord extends activity {
/** called when the activity is first created. */
button btnrecord, btnstop, btnexit;
seekbar skbvolume;//调节音量
boolean isrecording = false;//是否录放的标记
static final int frequency = 44100;
static final int channelconfiguration = audioformat.channel_configuration_mono;
static final int audioencoding = audioformat.encoding_pcm_16bit;
int recbufsize,playbufsize;
audiorecord audiorecord;
audiotrack audiotrack;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
settitle("助听器");
recbufsize = audiorecord.getminbuffersize(frequency,
channelconfiguration, audioencoding);
playbufsize=audiotrack.getminbuffersize(frequency,
channelconfiguration, audioencoding);
// -----------------------------------------
audiorecord = new audiorecord(mediarecorder.audiosource.mic, frequency,
channelconfiguration, audioencoding, recbufsize);
audiotrack = new audiotrack(audiomanager.stream_music, frequency,
channelconfiguration, audioencoding,
playbufsize, audiotrack.mode_stream);
//------------------------------------------
btnrecord = (button) this.findviewbyid(r.id.btnrecord);
btnrecord.setonclicklistener(new clickevent());
btnstop = (button) this.findviewbyid(r.id.btnstop);
btnstop.setonclicklistener(new clickevent());
btnexit = (button) this.findviewbyid(r.id.btnexit);
btnexit.setonclicklistener(new clickevent());
skbvolume=(seekbar)this.findviewbyid(r.id.skbvolume);
skbvolume.setmax(100);//音量调节的极限
skbvolume.setprogress(70);//设置seekbar的位置值
audiotrack.setstereovolume(0.7f, 0.7f);//设置当前音量大小
skbvolume.setonseekbarchangelistener(new seekbar.onseekbarchangelistener() {
@override
public void onstoptrackingtouch(seekbar seekbar) {
float vol=(float)(seekbar.getprogress())/(float)(seekbar.getmax());
audiotrack.setstereovolume(vol, vol);//设置音量
}
@override
public void onstarttrackingtouch(seekbar seekbar) {
// todo auto-generated method stub
}
@override
public void onprogresschanged(seekbar seekbar, int progress,
boolean fromuser) {
// todo auto-generated method stub
}
});
}
@override
protected void ondestroy() {
super.ondestroy();
android.os.process.killprocess(android.os.process.mypid());
}
class clickevent implements view.onclicklistener {
@override
public void onclick(view v) {
if (v == btnrecord) {
isrecording = true;
new recordplaythread().start();// 开一条线程边录边放
} else if (v == btnstop) {
isrecording = false;
} else if (v == btnexit) {
isrecording = false;
testrecord.this.finish();
}
}
}
class recordplaythread extends thread {
public void run() {
try {
byte[] buffer = new byte[recbufsize];
audiorecord.startrecording();//开始录制
audiotrack.play();//开始播放
while (isrecording) {
//从mic保存数据到缓冲区
int bufferreadresult = audiorecord.read(buffer, 0,
recbufsize);
byte[] tmpbuf = new byte[bufferreadresult];
system.arraycopy(buffer, 0, tmpbuf, 0, bufferreadresult);
//写入数据即播放
audiotrack.write(tmpbuf, 0, tmpbuf.length);
}
audiotrack.stop();
audiorecord.stop();
} catch (throwable t) {
toast.maketext(testrecord.this, t.getmessage(), 1000);
}
}
};
}
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希望本文所述实例对大家的android项目开发有一定的借鉴价值。