public Cursor query(FileCategory fc, SortMethod sort) {
Uri uri = getContentUriByCategory(fc);
String selection = buildSelectionByCategory(fc);
String sortOrder = buildSortOrder(sort);
if (uri == null) {
Log.e(LOG_TAG, "invalid uri, category:" + fc.name());
return null;
}
String[] columns =
new String[] {
FileColumns._ID, FileColumns.DATA, FileColumns.SIZE, FileColumns.DATE_MODIFIED
};
return mContext.getContentResolver().query(uri, columns, selection, null, sortOrder);
}
private boolean refreshMediaCategory(FileCategory fc, Uri uri) {
String[] columns = new String[] {"COUNT(*)", "SUM(_size)"};
Cursor c =
mContext.getContentResolver().query(uri, columns, buildSelectionByCategory(fc), null, null);
if (c == null) {
Log.e(LOG_TAG, "fail to query uri:" + uri);
return false;
}
if (c.moveToNext()) {
setCategoryInfo(fc, c.getLong(0), c.getLong(1));
Log.v(
LOG_TAG,
"Retrieved " + fc.name() + " info >>> count:" + c.getLong(0) + " size:" + c.getLong(1));
c.close();
return true;
}
return false;
}