[Android] 录音与播放录音实现

android开发文档中有一个关于录音的类MediaRecord,一张图介绍了基本的流程：

给出了一个常用的例子：

MediaRecorder recorder = new MediaRecorder();
 recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
 recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
 recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
 recorder.setOutputFile(PATH_NAME);
 recorder.prepare();
 recorder.start();   // Recording is now started
 ...
 recorder.stop();
 recorder.reset();   // You can reuse the object by going back to setAudioSource() step
 recorder.release(); // Now the object cannot be reused

我在这里实现了一个简单的程序，过程和上述类似，录音以及录音的播放。

1.基本界面如下：

2.工程中各文件内容如下：

2.1 Activity——RecordActivity

package com.cxf;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class RecordActivity extends Activity {
   
	private static final String LOG_TAG = "AudioRecordTest";
	//语音文件保存路径
	private String FileName = null;
	
	//界面控件
	private Button startRecord; 
	private Button startPlay;
	private Button stopRecord;
	private Button stopPlay;
	
	//语音操作对象
	private MediaPlayer mPlayer = null;
	private MediaRecorder mRecorder = null;
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //开始录音
        startRecord = (Button)findViewById(R.id.startRecord);
        startRecord.setText(R.string.startRecord);
        //绑定监听器
        startRecord.setOnClickListener(new startRecordListener());
        
        //结束录音
        stopRecord = (Button)findViewById(R.id.stopRecord);
        stopRecord.setText(R.string.stopRecord);
        stopRecord.setOnClickListener(new stopRecordListener());
        
        //开始播放
        startPlay = (Button)findViewById(R.id.startPlay);
        startPlay.setText(R.string.startPlay);
        //绑定监听器
        startPlay.setOnClickListener(new startPlayListener());
        
        //结束播放
        stopPlay = (Button)findViewById(R.id.stopPlay);
        stopPlay.setText(R.string.stopPlay);
        stopPlay.setOnClickListener(new stopPlayListener());
        
        //设置sdcard的路径
        FileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        FileName += "/audiorecordtest.3gp";
    }
    //开始录音
    class startRecordListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			 mRecorder = new MediaRecorder();
		     mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
		     mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
		     mRecorder.setOutputFile(FileName);
		     mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
		     try {
		         mRecorder.prepare();
		     } catch (IOException e) {
		         Log.e(LOG_TAG, "prepare() failed");
		     }
		     mRecorder.start();
		}
    	
    }
    //停止录音
    class stopRecordListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			 mRecorder.stop();
		     mRecorder.release();
		     mRecorder = null;
		}
    	
    }
    //播放录音
    class startPlayListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			mPlayer = new MediaPlayer();
			try{
				mPlayer.setDataSource(FileName);
				mPlayer.prepare();
				mPlayer.start();
			}catch(IOException e){
				Log.e(LOG_TAG,"播放失败");
			}
		}
    	
    }
    //停止播放录音
    class stopPlayListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			mPlayer.release();
	        mPlayer = null;
		}
    	
    }
}

2.2 main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
	<Button 
	    android:id="@+id/startRecord"
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
      />
	<Button 
	    android:id="@+id/stopRecord"
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
      />
	<Button 
	    android:id="@+id/startPlay"
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
      />
	<Button 
	    android:id="@+id/stopPlay"
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
      />
</LinearLayout>

2.3 Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cxf"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="4" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".RecordActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            
        </activity>
       
    </application>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
</manifest>

2.4 string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>


    <string name="hello"></string>
    <string name="app_name">Record</string>
	<string name="startRecord">开始录音</string>
	<string name="stopRecord">结束录音</string>
	<string name="startPlay">开始播放</string>
	<string name="stopPlay">结束播放</string>
</resources>

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[Android] 录音与播放录音实现

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