Android提高第十篇之AudioRecord实现\"助听器\"

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本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！

Android可以通过MediaRecorder和AudioRecord这两个工具来实现录音，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。

PS：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：

PS：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。

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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>

<uses-permission android:name=\"android.permission.RECORD_AUDIO\"></uses-permission>

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> <?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>

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);

}

};

}