多媒体—录音

public class MainActivity extends Activity {
	
	private Button start_btn,stop_btn;//开始结束录音按钮
	private ListView list_view;//显示录音文件的listview
	
	private MediaRecorder mediaRecorder;//创建一个系统媒体录音MediaRecorder
	private File recorderFile;//录制的音频文件
	private File recorderPath;//录制的音频文件路径
	private List<String> lMusicList=new ArrayList<String>();////录音文件列表
	private String shortFile = "录音_";//临时文件的前缀
	
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //一、调用获取音频文件路径的方法
        recorderPath=getRecorderSDPath();
        //二、调用获取音频的list列表
        if(recorderPath!=null){
        	getMusicList();
        }
        //三、开始录音
        start_btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				//1、实例化MediaRecorder对象
				mediaRecorder=new MediaRecorder();
				//2、设置麦克风
				mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
				 /* 3、设置输出文件的格式：THREE_GPP/MPEG-4/RAW_AMR/Default
                 * THREE_GPP(3gp格式，H263视频/AMR音频编码)、MPEG-4、RAW_AMR(只支持音频且音频编码要求为AMR_NB)
                 * */
				mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
				//4、设置音频文件的编码：AAC/AMR_NB/AMR_MB/Default
				mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
				try {
					//5、设置输出文件的路径 
					recorderFile=File.createTempFile(shortFile, ".amr",recorderPath);
					mediaRecorder.setOutputFile(recorderFile.getAbsolutePath());
					//6、准备录音
					mediaRecorder.prepare();
					//7、开始录音
					mediaRecorder.start();
					//8、设置按钮状态
					start_btn.setEnabled(false);
					stop_btn.setEnabled(true);
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			
			}
		});
        //四、停止录音
        stop_btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				if(recorderFile!=null){
					//1、停止录音
					mediaRecorder.stop();
					//2、将录音文件添加到List中
					lMusicList.add(recorderFile.getName());
					//3、new一个ArrayAdapter<String>对象，将lMusicList放入
					ArrayAdapter<String> musicList1=new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, lMusicList);
					//4、将musicList1放入list_view
					list_view.setAdapter(musicList1);
					//5、释放资源
					mediaRecorder.release();
					mediaRecorder=null;
					//6、设置按钮状态
					start_btn.setEnabled(true);
					stop_btn.setEnabled(false);
				}
			}
		});
        //五、为list_view设置监听，得到每一个点击的item;当我们点击列表时，播放被点击的音乐
        list_view.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				File playMusicFile=new File(recorderPath.getAbsolutePath()+File.separator+lMusicList.get(position));
				// 调用播放音乐方法
                playMusic(playMusicFile);
			}
		});
    }
	//实例化
    private void init() {
		// TODO Auto-generated method stub
    	start_btn=(Button)findViewById(R.id.start_btn);
    	stop_btn=(Button)findViewById(R.id.stop_btn);
    	list_view=(ListView)findViewById(R.id.list_view);
    	//设置按钮的初始状态
    	start_btn.setEnabled(true);
    	stop_btn.setEnabled(false);
	}
    //获取音频文件路径的方法
    private File getRecorderSDPath() {
		// TODO Auto-generated method stub
    	File file=null;
    	if(Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)){
    		file=Environment.getExternalStorageDirectory();		
    	}else{
    		Toast.makeText(this, "无SD卡，请确认SD卡以插入。", Toast.LENGTH_LONG).show();
    	}
    	return file;
	}
    //获取音频的list列表
    private void getMusicList() {
		// TODO Auto-generated method stub
    	File fileHome=recorderPath;
    	//括号里填的是音乐过滤器对象
    	if(fileHome.listFiles(new MusicFilter()).length>0){
    		for(File file:fileHome.listFiles(new MusicFilter())){
    			lMusicList.add(file.getName());
    		}
    		ArrayAdapter<String> musiclist=new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1,lMusicList);
    		list_view.setAdapter(musiclist);
    	}
		
	}
    //音乐过滤器类
    class MusicFilter implements FilenameFilter{
		@Override
		public boolean accept(File dir, String filename) {
			// TODO Auto-generated method stub
			return filename.endsWith(".amr");
		} 	
    }
    //播放音乐方法
    private void playMusic(File playMusicFile) {
		// TODO Auto-generated method stub
    	Intent intent=new Intent(Intent.ACTION_VIEW);
    	Uri uri = Uri.fromFile(playMusicFile);
    	intent.setDataAndType(uri, "audio/mp3");
    	startActivity(intent);
	}
}