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