Android视频播放

先看效果图

做这个项目遗留有不少问题，视频全屏播放无法改变视频的大小，没有办法只好跳转界面，有大牛可指点一下，另一个就是，我桌面的Appwidget已实现播放视频

但问题来咯！切换界面时视频还在界面呆着移不走了，而且桌面背景全黑了，额！效果很差，没办法了。

嗯，上代码吧。首先进来去取视频文件数据

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://" + Environment.getExternalStorageDirectory())));

这句话的意思是扫描全盘的视频文件

private void getMediaData() {ContentResolver contentResolver = getContentResolver();Cursor cursor = contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null,null);data = new ArrayList<VideoInfo>();for (cursor.moveToFirst(); !(cursor.isAfterLast()); cursor.moveToNext()) {VideoInfo info = new VideoInfo();int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));info.setId(id);// 名称 ：MediaStore.Audio.Media.TITLEString title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));info.setTitle(title);// 专辑名：MediaStore.Audio.Media.ALBUM// String album = cursor.getString(cursor// .getColumnIndexOrThrow(MediaStore.Video.Media.ALBUM));// 歌手名： MediaStore.Audio.Media.ARTIST// String artist = cursor.getString(cursor// .getColumnIndexOrThrow(MediaStore.Video.Media.ARTIST));// 路径 ：MediaStore.Audio.Media.DATAString path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));info.setPath(path);// 总播放时长 ：MediaStore.Audio.Media.DURATIONint duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));info.setDuration(duration);// 大小 ：MediaStore.Audio.Media.SIZEint size = (int) cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE));info.setSize(size);String displayname = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME));info.setDisplayname(displayname);// 拍摄时间// int dateTaken = cursor.getInt(cursor// .getColumnIndexOrThrow(MediaStore.Video.Media.DATE_TAKEN));// Bitmap bm =// android.media.ThumbnailUtils.createVideoThumbnail(path,// Images.Thumbnails.MICRO_KIND);data.add(info);}cursor.close();}

这是查询Contentprovider里视频文件的信息，得到数据就好办了，放到listview里显示出来就行，下面的核心就是播放出视频文件了。
先贴出code

private void playoneVideo(String path) {filePath = path;curindex=getindex();videoview.setVideoPath(path);videoview.setMySizeChangeLinstener(new MySizeChangeLinstener() {public void doMyThings() {setVideoScale(SCREEN_DEFAULT);}});videoview.setOnPreparedListener(new OnPreparedListener() {public void onPrepared(MediaPlayer mp) {progress.setMax(videoview.getDuration());totalTime.setText(toTime(videoview.getDuration()));setVideoScale(SCREEN_FULL);videoview.seekTo(currentPosition);handler.post(updateRun);setVideoScale(SCREEN_DEFAULT);videoview.start();}});videoview.setOnCompletionListener(new OnCompletionListener() {public void onCompletion(MediaPlayer mp) {if(curindex==-1||curindex==-2){playoneVideo(filePath);}else{curindex=0;playVideo();}}});}

传进来播放文件的路径，给videoview就行了，这个Videoview系统也有，我是自己写了个，因为我还要把它加到Widget里去，需要修改一下它的代码。说白了Videoview也是继承SurfaceView的，进行一了封装而已。直接看核心代码：

 private void openVideo() {        if (mUri == null || mSurfaceHolder == null) {            // not ready for playback just yet, will try again later            return;        }        // Tell the music playback service to pause        // TODO: these constants need to be published somewhere in the framework.        Intent i = new Intent("com.android.music.musicservicecommand");        i.putExtra("command", "pause");        mContext.sendBroadcast(i);        if (mMediaPlayer != null) {            mMediaPlayer.reset();            mMediaPlayer.release();            mMediaPlayer = null;        }        try {            mMediaPlayer = new MediaPlayer();            mMediaPlayer.setOnPreparedListener(mPreparedListener);            mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);            mIsPrepared = false;            Log.v(TAG, "reset duration to -1 in openVideo");            mDuration = -1;            mMediaPlayer.setOnCompletionListener(mCompletionListener);            mMediaPlayer.setOnErrorListener(mErrorListener);            mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);            mCurrentBufferPercentage = 0;            mMediaPlayer.setDataSource(mContext, mUri);            mMediaPlayer.setDisplay(mSurfaceHolder);            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);            mMediaPlayer.setScreenOnWhilePlaying(true);            mMediaPlayer.prepareAsync();            attachMediaController();        } catch (IOException ex) {            Log.w(TAG, "Unable to open content: " + mUri, ex);            return;        } catch (IllegalArgumentException ex) {            Log.w(TAG, "Unable to open content: " + mUri, ex);            return;        }    }

注意在新建MediaPlayer之前一定要释放资源，其他的没什么好说的，就是从外部传值（mUri），传对象（Listener，mSurfaceHolder）等数据过来。你如果外面要对MediaPlayer操作的话全写在这里面，在外面直接调就行了。例如

public int getCurrentPosition() {        if (mMediaPlayer != null && mIsPrepared) {            return mMediaPlayer.getCurrentPosition();        }        return 0;    }

怎么调

int currentPosition = videoview.getCurrentPosition();

就这样ok了。
全屏那个功能点实现的不好，也说说我的思路，双击视频或点击全屏按钮时

                currentPosition = videoview.getCurrentPosition();Intent intent = new Intent();Bundle bd = new Bundle();bd.putString("path", filePath);bd.putInt("curposition", currentPosition);intent.putExtras(bd);intent.setClass(getBaseContext(), PlayVideoFullScreenAct.class);startActivityForResult(intent, 1);

我也说过当我直接把videoview放大到全屏时，视频还是以前的大小，只好搞这中笨方法了。把播放的视频路径，和当前播放的进度传过去，在那个Activity里接一下就ok了，就能继续播放了

intent = getIntent();filepath = intent.getExtras().getString("path");curposition = intent.getExtras().getInt("curposition");

有了路径和进度就可以直接播放了

private void playVideo() {curindex = getindex();videoview.setVideoPath(filepath);videoview.setOnPreparedListener(new OnPreparedListener() {public void onPrepared(MediaPlayer mp) {seekbar.setMax(videoview.getDuration());fulltotaltext.setText(toTime(videoview.getDuration()));videoview.setVideoScale(screenWidth, screenHeight);videoview.seekTo(curposition);handler.post(updateRun);videoview.start();}});videoview.setOnCompletionListener(new OnCompletionListener() {public void onCompletion(MediaPlayer mp) {if(curindex==-1||curindex==-2){PlayVideoFullScreenAct.this.finish();}curindex++;if (curindex > data.size() - 1) {curindex = 0;}curposition = 0;handler.removeCallbacks(updateRun);videoview.reset();playVideo();}});}

当退出全屏时再把路径和进度传回去就ok了，嗯！差不多了。
视频播放项目源码