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