我很难从文件中获取特定的视频文件详细信息,以便持续时间等等。我目前所能做的就是获取cursor
所有文件,然后逐个循环。
Cursor cursor = MediaStore.Video.query(getContext().getContentResolver(), MediaStore.Video.Media.EXTERNAL_CONTENT_URI, new String[]{MediaStore.Video.VideoColumns.DURATION,MediaStore.Video.VideoColumns.DATE_TAKEN,MediaStore.Video.VideoColumns.RESOLUTION,MediaStore.Video.VideoColumns.DISPLAY_NAME});
if(cursor.moveToFirst())
while(!cursor.isLast()){
if(cursor.getString(3)==fight.filename)
{
// do something here
}
cursor.moveToNext();
}
但我需要访问特定文件的详细信息,因此我尝试创建URI
,但由于返回的cursor
始终为null
而没有运气。我哪里出错?
Uri uri = Uri.parse(Environment.DIRECTORY_DCIM+"/FightAll_BJJ_Scoring/"+(fight.filename));
Cursor cursor = MediaStore.Video.query(getContext().getContentResolver(), uri, new String[]{MediaStore.Video.VideoColumns.DURATION,MediaStore.Video.VideoColumns.DATE_TAKEN,MediaStore.Video.VideoColumns.RESOLUTION,MediaStore.Video.VideoColumns.DISPLAY_NAME});
// cursor is always null here
编辑:感谢下面的zapl答案,我在下面得到了这个代码(注意我修改了光标线),但是现在返回的光标不是null,但它仍然是空的,当我尝试读取cursor.getString(2)时我得到了没有。
Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
String selection = MediaColumns.DATA + "=?";
String[] selectionArgs = { Environment.DIRECTORY_DCIM+"/FightAll_BJJ_Scoring/"+(fight.filename) };
Cursor cursor = getContext().getContentResolver().query(uri, new String[]{MediaStore.Video.VideoColumns.DURATION,MediaStore.Video.VideoColumns.DATE_TAKEN,MediaStore.Video.VideoColumns.RESOLUTION,MediaStore.Video.VideoColumns.DISPLAY_NAME}, selection, selectionArgs, null);
非常感谢任何帮助。
答案 0 :(得分:2)
你的uri错了。媒体数据库不知道如何解析路径,因此您必须使用您期望的路径查询该项目。这类似于下面的代码(因为我在这里直接写了它可能包含错误)。
Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
String selection = MediaColumns.DATA + "=?";
String dcim = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath();
String[] selectionArgs = { dcim+"/FightAll_BJJ_Scoring/"+(fight.filename) };
Cursor cursor = MediaStore.Video.query(getContext().getContentResolver(), uri, new String[]{MediaStore.Video.VideoColumns.DURATION,MediaStore.Video.VideoColumns.DATE_TAKEN,MediaStore.Video.VideoColumns.RESOLUTION,MediaStore.Video.VideoColumns.DISPLAY_NAME}, selection, selectionArgs, null);