解决query不到本地视频方法

在查询前调用，若未出来，再进一次即可

 //发出广播让系统更新媒体库        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            Intent mediaScanIntent = new Intent( Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);            Uri contentUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getAbsolutePath()));            mediaScanIntent.setData(contentUri);            getActivity().sendBroadcast(mediaScanIntent);        } else {            getActivity(). sendBroadcast(new Intent(                    Intent.ACTION_MEDIA_MOUNTED,                    Uri.parse("file://" + Environment.getExternalStorageDirectory())));        }

若提示没有权限加上

 <protected-broadcast android:name="android.intent.action.MEDIA_MOUNTED" />