java nomedia,MediaStore - Uri查询所有类型的文件（媒体和非媒体）

它是 "external" 或 "internal" 虽然内部(系统文件)在这里可能没用 .

ContentResolver cr = context.getContentResolver();

Uri uri = MediaStore.Files.getContentUri("external");

// every column, although that is huge waste, you probably need

// BaseColumns.DATA (the path) only.

String[] projection = null;

// exclude media files, they would be here also.

String selection = MediaStore.Files.FileColumns.MEDIA_TYPE + "="

+ MediaStore.Files.FileColumns.MEDIA_TYPE_NONE;

String[] selectionArgs = null; // there is no ? in selection so null here

String sortOrder = null; // unordered

Cursor allNonMediaFiles = cr.query(uri, projection, selection, selectionArgs, sortOrder);

如果你只想 .pdf ，你可以检查mimetype

// only pdf

String selectionMimeType = MediaStore.Files.FileColumns.MIME_TYPE + "=?";

String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");

String[] selectionArgsPdf = new String[]{ mimeType };

Cursor allPdfFiles = cr.query(uri, projection, selectionMimeType, selectionArgsPdf, sortOrder);