Android提高第十篇之AudioRecord实现 助听器
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:view plaincopy to clipboardprint?
<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:
view plaincopy to clipboardprint?
<?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:
view plaincopy to clipboardprint?
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());
补充:移动开发 , Android ,