最近项目在做一个视频选择的功能,一开始的思路是通过 MediaStore获取媒体信息:
public static List getLocalVideoList(Context context) {
List localVideoBeans = new ArrayList<>();
// 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};
// 视频其他信息的查询条件
String[] mediaColumns = {MediaStore.Video.Media._ID,
MediaStore.Video.Media.DATA, MediaStore.Video.Media.DURATION, MediaStore.Video.Media.SIZE};
Cursor cursor = context.getContentResolver().query(MediaStore.Video.Media
.EXTERNAL_CONTENT_URI,
mediaColumns, null, null, null);
if (cursor == null) {
return localVideoBeans;
}
try {
if (cursor.moveToFirst()) {
do {
LocalVideoBean info = new LocalVideoBean();
int id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Video.Media._ID));
Cursor thumbCursor = context.getContentResolver().query(
MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI,
thumbColumns, MediaStore.Video.Thumbnails.VIDEO_ID
+ "=" + id, null, null);
if (thumbCursor == null) {
continue;
}
try {
if (thumbCursor.moveToFirst()) {
info.setId(id);
info.setVideoPath(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media
.DATA)));
......
localVideoBeans.add(info);
}
} catch (Exception e) {
LogUtil.e(TAG, e.toString());
} finally {
if (!thumbCursor.isClosed()) {
thumbCursor.close();
}
}
} while (cursor.moveToNext());
}
} catch (Exception e) {
LogUtil.e(TAG, e.toString());
} finally {
if (!cursor.isClosed()) {
cursor.close();
}
}
return localVideoBeans;
}
可是发现在一加手机5和三星的部分机型上并不能将 最近 拍的新视频获取到。网络上也大多是相互抄差不多的代码。
后来灵机一动,既然手机上的图库软件都能将最近拍摄的视频加载出来,那么肯定存在实现方式,能将最新的视频加载出来。
后来找到一个图库实现库,看了下源码,其实和上面的代码并没有多少差别:
/**
* 获取本地视频
*
* @param context
* @return 本地视频列表
*/
public static List getLocalVideoList(Context context) {
List localVideoBeans = new ArrayList<>();
ContentResolver contentResolver = context.getContentResolver();
String[] projection = new String[]{
MediaStore.Video.Media._ID,
MediaStore.Video.Media.DATA,
MediaStore.Video.Media.DURATION,
MediaStore.Video.Media.SIZE
};
Cursor cursor = contentResolver.query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
projection,
null,
null,
MediaStore.Video.Media.DATE_ADDED + " DESC LIMIT " + Integer.MAX_VALUE + " OFFSET " + 0);
if (cursor != null) {
try {
int count = cursor.getCount();
if (count > 0) {
cursor.moveToFirst();
do {
LocalVideoBean localVideoBean = parseVideoCursor(context, cursor);
if (localVideoBean != null) {
localVideoBeans.add(localVideoBean);
}
} while (cursor.moveToNext());
}
} catch (Exception e) {
LogUtil.e(TAG, e);
} finally {
if (!cursor.isClosed()) {
cursor.close();
}
}
}
return localVideoBeans;
}
和第一段代码并没有什么不同之处,除了一处...
Cursor cursor = contentResolver.query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
projection,
null,
null,
MediaStore.Video.Media.DATE_ADDED + " DESC LIMIT " + Integer.MAX_VALUE + " OFFSET " + 0);
为什么变为这个排序条件就可以将最近拍摄的视频取出呢?这需要看看源码是怎么实现的,阅读源码中...
如有缺漏不足之处,欢迎创建issue,PR