本文来自http://blog.youkuaiyun.com/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。
使用AudioRecord必须要申请许可,在AndroidManifest.xml里面添加这句:
- <uses-permission android:name=\"android.permission.RECORD_AUDIO\"></uses-permission>
main.xml的源码如下:
- <?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:
- 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);
- }
- }
- };
- }