实现音乐播放器，多线程处理进度条

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protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);File musicDir=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);file=new File(musicDir,"朴树 - 白桦林.mp3");seekBar=(SeekBar) findViewById(R.id.seekBar1);currentTv=(TextView) findViewById(R.id.TextView01);durationTv=(TextView) findViewById(R.id.TextView02);seekBar.setOnSeekBarChangeListener(this);mHandler=new MainHandler();//默认当前线程Looper}enum States{STOP,PAUSE}States state=States.STOP;private MediaPlayer mPlayer;private SeekBarThread barThread;/**实现音乐的播放*/public void onMusicPlay(View v){//判定播放器对象是否为空，为null则创建新的对象if(mPlayer==null){mPlayer=new MediaPlayer();mPlayer.setOnPreparedListener(this);mPlayer.setOnCompletionListener(this);}//判定媒体播放状态，假如是暂停则直接启动播放if(state==States.PAUSE){mPlayer.start();return;}//假如不是暂停状态则设置要播放的音乐路径，加载音乐try{mPlayer.setDataSource(file.getPath());mPlayer.prepareAsync();//工作线程加载}catch(Exception e){e.printStackTrace();}//更新seekBarif(barThread==null){barThread=new SeekBarThread();barThread.start();}}private boolean isUpdate=true;/**负责给主线程发消息，更新SeekBar的线程对象*/class SeekBarThread extends Thread{@Overridepublic void run() {while(isUpdate){try{sleep(1000);}catch(Exception e){}mHandler.sendEmptyMessage(1);}}}/**实现进度条*/private SimpleDateFormat sdf=new SimpleDateFormat("mm:ss");class MainHandler extends Handler{public MainHandler() {}public MainHandler(Looper looper) {super(looper);}@Overridepublic void handleMessage(Message msg) {if(msg.what==1&&mPlayer!=null){int cPos=mPlayer.getCurrentPosition();//获取当前位置 seekBar.setProgress(cPos);//setMax是设置 进度条的最大值,setProgress是设置进度条的当前进度。}}}/**实现音乐的暂停*/public void onMusicPause(View v){if(mPlayer!=null&&mPlayer.isPlaying()){mPlayer.pause();state=States.PAUSE;}}@Overrideprotected void onDestroy() {super.onDestroy();isUpdate=false;if(mPlayer!=null){mPlayer.release();mPlayer=null;}}/**当音乐加载完成以后会执行此方法*/@Overridepublic void onPrepared(MediaPlayer mp) {Log.i("TAG", "onPrepared");mp.start();//getDuration()获取歌曲长度，毫秒durationTv.setText(sdf.format(new Date(mPlayer.getDuration())));seekBar.setMax(mPlayer.getDuration());}@Overridepublic void onCompletion(MediaPlayer mp) {//Completion 结束Log.i("TAG", "onCompletion");mp.start();}/**以下是设置seekBar监听，实现接口后自动添加的*/@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {currentTv.setText(sdf.format(new Date(mPlayer.getCurrentPosition())));}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {if(mPlayer!=null){int cPos=seekBar.getProgress();//实现跳转到要播放的位置的功能！mPlayer.seekTo(cPos);}}
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