MediaRecorder录制音频

一个录音的小程序!!

Main.xml

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

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".RecorderActivity" >
            <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.RECORD_AUDIO"></uses-permission>  
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
</manifest>

RecorderActivity.java

package com.recorder;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class RecorderActivity extends Activity {
	/** Called when the activity is first created. */  
    private ListView mListView = null;  
    private Button btn_start = null;  
    private Button btn_stop = null;  
    private MediaRecorder mMediaRecorder = null;  
    private List<String> rec = new ArrayList<String>();// 存放录音文件  
    private File home = null;  
    private File path = null;  
    private String temp = "recaudio_";// 临时文件前缀  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        mListView = (ListView) this.findViewById(R.id.listView1);  
        btn_start = (Button) this.findViewById(R.id.start);  
        btn_stop = (Button) this.findViewById(R.id.stop);  
        // 是否存在SD卡  
        if (Environment.getExternalStorageState().equals(  
                Environment.MEDIA_MOUNTED)) {  
            home = Environment.getExternalStorageDirectory();  
            MusicList();  
        } else {  
            Toast.makeText(this, "请先插入SD卡", Toast.LENGTH_LONG).show();  
            return;  
        }  
        btn_start.setOnClickListener(new Button.OnClickListener() {  
  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                try {  
                    // 创建录音临时文件  
                    path = File.createTempFile(temp, ".amr", home);  
                    setTitle("=="+path.getAbsolutePath());  
                    mMediaRecorder = new MediaRecorder();  
                      
                    mMediaRecorder  
                            .setAudioSource(MediaRecorder.AudioSource.MIC);// 设置数据来源，麦克风  
                    mMediaRecorder  
                            .setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);// 设置格式  
                    mMediaRecorder  
                            .setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);// 设置编码  
                    mMediaRecorder.setOutputFile(path.getAbsolutePath());// 设置输出文件路径  
                    mMediaRecorder.prepare();  
                    mMediaRecorder.start();  
                } catch (IOException e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                }  
            }  
  
        });  
        btn_stop.setOnClickListener(new Button.OnClickListener() {  
  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                mMediaRecorder.stop();  
                mMediaRecorder.release();  
                mMediaRecorder = null;  
                MusicList();  
            }  
  
        });  
        mListView.setOnItemClickListener(new OnItemClickListener(){  
  
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,  
                    long arg3) {  
                // TODO Auto-generated method stub  
                String path = home+File.separator+rec.get(arg2);  
                File f = new File(path);  
                PlayMusic(f);  
            }  
              
        });  
    }  
  
    /** 
     * 显示列表 
     */  
    public void MusicList() {  
        File[] f = home.listFiles(new MusicFilter());  
                  rec.clear();  
        for (int i = 0; i < f.length; i++) {  
            File file = f[i];  
            rec.add(file.getName());  
        }  
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,  
                android.R.layout.simple_list_item_1, rec);  
        mListView.setAdapter(adapter);  
    }  
  
    /** 
     * 播放录音文件 
     * @param file 
     */  
    public void PlayMusic(File file){  
        Intent intent = new Intent();  
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        intent.setAction(Intent.ACTION_VIEW);  
        intent.setDataAndType(Uri.fromFile(file), "audio");  
        this.startActivity(intent);  
    }  
    class MusicFilter implements FilenameFilter {  
  
        public boolean accept(File dir, String filename) {  
            // TODO Auto-generated method stub  
            return (filename.endsWith(".amr"));  
        }  
  
    } 
}