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androidmergeandroid-contentproviderandroid-cursor

How to represent 2 cursors as 1 sorted cursor?

I have 2 different sets of data, each of them use its own ContentProvider. Querying to them I can get 2 different cursors. Those 2 cursors has 2 different primary keys, but there's one and the same field (DATE) which I can use for ordering (other fields are different).

My goal is to have one final merged Cursor which will be sorted by those DATE field. I have investigated MergeCursor but it doesn't fit to me, since it returns merged/concatenated (but not sorted Cursor).

Any ideas, clues?

Solution

  • You can try this class from AOSP repository: https://android.googlesource.com/platform/frameworks/base.git/+/android-4.4.4_r1/core/java/com/android/internal/database/SortCursor.java

    There is a performance warning at the beginning of the class but if you don't have 10K or 100K records it might be fine.