如何扫描出android系统媒体库中视频文件

转于：http://my.oschina.net/AlexZhuang/blog/57695

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android系统启动时会去扫描系统文件，并将系统支持的视频文件（mp4,3gp,wmv）扫描到媒体库（MediaStore）中，下面代码演示如何获得这些文件的信息：

 

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public static List<VideoInfo> sysVideoList = null;// 视频信息集合 sysVideoList = new ArrayList<VideoInfo>(); setVideoList();       private void setVideoList() {         // MediaStore.Video.Thumbnails.DATA:视频缩略图的文件路径         String[] thumbColumns = { MediaStore.Video.Thumbnails.DATA,                 MediaStore.Video.Thumbnails.VIDEO_ID };           // MediaStore.Video.Media.DATA：视频文件路径；         // MediaStore.Video.Media.DISPLAY_NAME : 视频文件名，如 testVideo.mp4         // MediaStore.Video.Media.TITLE: 视频标题 : testVideo         String[] mediaColumns = { MediaStore.Video.Media._ID,                 MediaStore.Video.Media.DATA, MediaStore.Video.Media.TITLE,                 MediaStore.Video.Media.MIME_TYPE,                 MediaStore.Video.Media.DISPLAY_NAME };           cursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,                 mediaColumns, null, null, null);                   if(cursor==null){             Toast.makeText(SystemVideoChooseActivity.this, "没有找到可播放视频文件", 1).show();             return;         }         if (cursor.moveToFirst()) {             do {                 VideoInfo info = new VideoInfo();                 int id = cursor.getInt(cursor                         .getColumnIndex(MediaStore.Video.Media._ID));                 Cursor thumbCursor = managedQuery(                         MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI,                         thumbColumns, MediaStore.Video.Thumbnails.VIDEO_ID                                 + "=" + id, null, null);                 if (thumbCursor.moveToFirst()) {                     info.setThumbPath(thumbCursor.getString(thumbCursor                             .getColumnIndex(MediaStore.Video.Thumbnails.DATA)));                 }                 info.setPath(cursor.getString(cursor                         .getColumnIndexOrThrow(MediaStore.Video.Media.DATA)));                 info.setTitle(cursor.getString(cursor                         .getColumnIndexOrThrow(MediaStore.Video.Media.TITLE)));                                   info.setDisplayName(cursor.getString(cursor                         .getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME)));                 LogUtil.log(TAG, "DisplayName:"+info.getDisplayName());                 info.setMimeType(cursor                         .getString(cursor                                 .getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE)));                                   sysVideoList.add(info);             } while (cursor.moveToNext());         }     }

 

有一点需要注意的是：系统的媒体库并不会在我们添加视频文件后自动更新，我们如何去手动扫描媒体库，或者重启系统才能从媒体库中得到更新的视频文件：

 

 

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1 2	sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"                  + Environment.getExternalStorageDirectory())));