Android提高第十篇之AudioRecord实现 助听器

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       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。

使用AudioRecord必须要申请许可，在AndroidManifest.xml里面添加这句：

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1. <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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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical" android:layout_width="fill_parent"  
4.     android:layout_height="fill_parent">  
5.   
6.     <Button android:layout_height="wrap_content" android:id="@+id/btnRecord"  
7.         android:layout_width="fill_parent" android:text="开始边录边放"></Button>  
8.     <Button android:layout_height="wrap_content"  
9.         android:layout_width="fill_parent" android:text="停止" android:id="@+id/btnStop"></Button>  
10.     <Button android:layout_height="wrap_content" android:id="@+id/btnExit"  
11.         android:layout_width="fill_parent" android:text="退出"></Button>  
12.     <TextView android:id="@+id/TextView01" android:layout_height="wrap_content"  
13.         android:text="程序音量调节" android:layout_width="fill_parent"></TextView>  
14.     <SeekBar android:layout_height="wrap_content" android:id="@+id/skbVolume"  
15.         android:layout_width="fill_parent"></SeekBar>  
16.   
17. </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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1. package com.testRecord;  
2.   
3. import android.app.Activity;  
4. import android.media.AudioFormat;  
5. import android.media.AudioManager;  
6. import android.media.AudioRecord;  
7. import android.media.AudioTrack;  
8. import android.media.MediaRecorder;  
9. import android.os.Bundle;  
10. import android.view.View;  
11. import android.widget.Button;  
12. import android.widget.SeekBar;  
13. import android.widget.Toast;  
14.   
15. public class testRecord extends Activity {  
16.     /** Called when the activity is first created. */  
17.     Button btnRecord, btnStop, btnExit;  
18.     SeekBar skbVolume;//调节音量  
19.     boolean isRecording = false;//是否录放的标记  
20.     static final int frequency = 44100;  
21.     static final int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;  
22.     static final int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;  
23.     int recBufSize,playBufSize;  
24.     AudioRecord audioRecord;  
25.     AudioTrack audioTrack;  
26.   
27.     @Override  
28.     public void onCreate(Bundle savedInstanceState) {  
29.         super.onCreate(savedInstanceState);  
30.         setContentView(R.layout.main);  
31.         setTitle("助听器");  
32.         recBufSize = AudioRecord.getMinBufferSize(frequency,  
33.                 channelConfiguration, audioEncoding);  
34.   
35.         playBufSize=AudioTrack.getMinBufferSize(frequency,  
36.                 channelConfiguration, audioEncoding);  
37.         // -----------------------------------------  
38.         audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency,  
39.                 channelConfiguration, audioEncoding, recBufSize);  
40.   
41.         audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,  
42.                 channelConfiguration, audioEncoding,  
43.                 playBufSize, AudioTrack.MODE_STREAM);  
44.         //------------------------------------------  
45.         btnRecord = (Button) this.findViewById(R.id.btnRecord);  
46.         btnRecord.setOnClickListener(new ClickEvent());  
47.         btnStop = (Button) this.findViewById(R.id.btnStop);  
48.         btnStop.setOnClickListener(new ClickEvent());  
49.         btnExit = (Button) this.findViewById(R.id.btnExit);  
50.         btnExit.setOnClickListener(new ClickEvent());  
51.         skbVolume=(SeekBar)this.findViewById(R.id.skbVolume);  
52.         skbVolume.setMax(100);//音量调节的极限  
53.         skbVolume.setProgress(70);//设置seekbar的位置值  
54.         audioTrack.setStereoVolume(0.7f, 0.7f);//设置当前音量大小  
55.         skbVolume.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {  
56.               
57.             @Override  
58.             public void onStopTrackingTouch(SeekBar seekBar) {  
59.                 float vol=(float)(seekBar.getProgress())/(float)(seekBar.getMax());  
60.                 audioTrack.setStereoVolume(vol, vol);//设置音量  
61.             }  
62.               
63.             @Override  
64.             public void onStartTrackingTouch(SeekBar seekBar) {  
65.                 // TODO Auto-generated method stub  
66.             }  
67.               
68.             @Override  
69.             public void onProgressChanged(SeekBar seekBar, int progress,  
70.                     boolean fromUser) {  
71.                 // TODO Auto-generated method stub  
72.             }  
73.         });  
74.     }  
75.   
76.     @Override  
77.     protected void onDestroy() {  
78.         super.onDestroy();  
79.         android.os.Process.killProcess(android.os.Process.myPid());  
80.     }  
81.   
82.     class ClickEvent implements View.OnClickListener {  
83.   
84.         @Override  
85.         public void onClick(View v) {  
86.             if (v == btnRecord) {  
87.                 isRecording = true;  
88.                 new RecordPlayThread().start();// 开一条线程边录边放  
89.             } else if (v == btnStop) {  
90.                 isRecording = false;  
91.             } else if (v == btnExit) {  
92.                 isRecording = false;  
93.                 testRecord.this.finish();  
94.             }  
95.         }  
96.     }  
97.   
98.     class RecordPlayThread extends Thread {  
99.         public void run() {  
100.             try {  
101.                 byte[] buffer = new byte[recBufSize];  
102.                 audioRecord.startRecording();//开始录制  
103.                 audioTrack.play();//开始播放  
104.                   
105.                 while (isRecording) {  
106.                     //从MIC保存数据到缓冲区  
107.                     int bufferReadResult = audioRecord.read(buffer, 0,  
108.                             recBufSize);  
109.   
110.                     byte[] tmpBuf = new byte[bufferReadResult];  
111.                     System.arraycopy(buffer, 0, tmpBuf, 0, bufferReadResult);  
112.                     //写入数据即播放  
113.                     audioTrack.write(tmpBuf, 0, tmpBuf.length);  
114.                 }  
115.                 audioTrack.stop();  
116.                 audioRecord.stop();  
117.             } catch (Throwable t) {  
118.                 Toast.makeText(testRecord.this, t.getMessage(), 1000);  
119.             }  
120.         }  
121.     };  
122. }  

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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