AudioRecord實現”助聽器” ,錄製和播放功能

轉載自:http://blog.csdn.net/hellogv/

 

Android可以通過MediaRecorder和AudioRecord這兩個工具來實現錄音，MediaRecorder直接把麥克風的資料存到檔案，並且能夠直接進行編碼(如AMR,MP3等)，而AudioRecord則是讀取麥克風的音頻流。本文使用AudioRecord讀取音頻流，使用AudioTrack播放音頻流，通過“邊讀邊播放”以及增大音量的方式來實現一個簡單的助聽器程式。

PS：由於目前的Android模擬器還不支援AudioRecord，因此本程式需要編譯之後放到真機運行。

先貼出本文程式運行：

PS：程式音量大小只是程式內部調節音量而已，要調到最大音量還需要手動設定系統音量。

 

 

使用AudioRecord必須要申請許可，在AndroidManifest.xml裡面添加這句：

 

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

main.xml的源碼如下：

01.<?xml version="1.0" encoding="utf-8"?>  02.<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  03.    android:orientation="vertical" android:layout_width="fill_parent"  04.    android:layout_height="fill_parent">  05.  06.    <Button android:layout_height="wrap_content" android:id="@+id/btnRecord"  07.        android:layout_width="fill_parent" android:text="開始邊錄邊放"></Button>  08.    <Button android:layout_height="wrap_content"  09.        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="程式音量大小" 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>  

testRecord.java的源碼如下：

01.package com.testRecord;  02.  03.import android.app.Activity;  04.import android.media.AudioFormat;  05.import android.media.AudioManager;  06.import android.media.AudioRecord;  07.import android.media.AudioTrack;  08.import android.media.MediaRecorder;  09.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;//調節音量   19.    boolean isRecording = false;//是否錄放的標記   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("助聽器");  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);//音量大小的極限   53.        skbVolume.setProgress(70);//設定seekbar的位置值   54.        audioTrack.setStereoVolume(0.7f, 0.7f);//設定當前音量大小   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);//設定音量   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();// 開一條線程邊錄邊放   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();//開始錄製   103.                audioTrack.play();//開始播放   104.                  105.                while (isRecording) {  106.                    //從MIC儲存資料到緩衝區   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.                    //寫入資料即播放   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.}