Some comments:
1. You use getContentResolver().insert(uri,values) to insert a row into a
content provider. Please don't equate content provider = database. Though
many content providers are implemented as databases, it's not a requirement.
*In particular*, a database provides operations such as join that a
content provider is not required to implement.
2. A null result from a content provider method *usually* indicates an
error.
In particular, the common pattern for query is to return null if an
internal error occurred (for example, an invalid URI). If no records match
the query, the common pattern is to return a Cursor with no records.
3. Since you're getting null for insert, the first thing I'd check is
the URI value you're passing in.
A. Elk
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