Android(安卓)实现简单媒体播放器功能

一、概述：

因为播放视频需要很大的内存，所以必须使用surfaceview ，
surfaceview 里实现了双缓冲的功能，

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二、全部代码：

/** * @描述         使用surfaceview 创建视频 * @项目名称      App_Basic * @包名         com.example.basic.media * @类名         MediaPlayerActivity * @author      chenlin * @date        2013-3-25 上午7:36:32 * @version     1.0 */public class MediaPlayerActivity extends BaseActivity {    private MediaPlayer mPlayer;    private Button mBtnPlay;    private Button mBtnPause;    private SurfaceView mSurfaceView;    private int mCurrentPosition;    private SeekBar seekBar;    private boolean isPlaying;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mSurfaceView = new SurfaceView(this);        seekBar = new SeekBar(this);        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                int progress = seekBar.getProgress();                if (mPlayer != null && isPlaying) {                    mPlayer.seekTo(progress);                }            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub            }            @Override            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                // TODO Auto-generated method stub            }        });        mSurfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        mSurfaceView.getHolder().addCallback(new Callback() {            @Override            public void surfaceDestroyed(SurfaceHolder holder) {                if (mPlayer!= null && mPlayer.isPlaying()) {                    mCurrentPosition = mPlayer.getCurrentPosition();                    stop();                }            }            @Override            public void surfaceCreated(SurfaceHolder holder) {                if (mCurrentPosition > 0) {                    play(mCurrentPosition);                }            }            @Override            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {                // TODO Auto-generated method stub            }        });    }    public void play(final int currentPosition){        try {            mPlayer  = new MediaPlayer();            mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);            Uri myUri = Uri.fromFile(new File("sdcard/mp3/1.mp3"));            mPlayer.setDataSource(getApplicationContext(), myUri);            mPlayer.setLooping(true);            mPlayer.setDisplay(mSurfaceView.getHolder());            mPlayer.prepareAsync();            //mPlayer.prepare();            mBtnPlay.setEnabled(false);            mPlayer.setOnCompletionListener(new OnCompletionListener() {                @Override                public void onCompletion(MediaPlayer mp) {                    mBtnPlay.setEnabled(true);                    mPlayer.release();                }            });            mPlayer.setOnErrorListener(new OnErrorListener() {                @Override                public boolean onError(MediaPlayer mp, int what, int extra) {                    mBtnPlay.setEnabled(true);                    mPlayer.release();                    isPlaying = false;                    return false;                }            });            mPlayer.setOnPreparedListener(new OnPreparedListener() {                public void onPrepared(MediaPlayer mp) {                    mPlayer.start();                    mPlayer.seekTo(currentPosition);                    seekBar.setMax(mPlayer.getDuration());                    new Thread(new Runnable() {                        @Override                        public void run() {                            isPlaying = true;                            while(isPlaying){                                seekBar.setProgress(mPlayer.getCurrentPosition());                                SystemClock.sleep(500);                            }                        }                    });                }            });        } catch (Exception e) {            e.printStackTrace();        }    }    public void pause(){        if ("接续".equals(mBtnPause.getText().toString())) {            mBtnPause.setText("暂停");            mPlayer.start();            return;        }        if (mPlayer != null && mPlayer.isPlaying()) {            mPlayer.pause();            mBtnPause.setText("继续");            return;        }    }    public void reset(){        if (mPlayer != null && mPlayer.isPlaying()) {            mPlayer.seekTo(0);            return;        }        play(0);    }    public void stop(){        if (mPlayer != null && mPlayer.isPlaying()) {            mPlayer.stop();            mPlayer.release();            mPlayer = null;            mBtnPlay.setEnabled(true);            isPlaying = false;        }    }}

一、概述：

二、全部代码：

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