Question

On Android 2.2 mContext=context (or anything else I put there) is never called. It does work on 2.3+.
Is it a known issue? Is there a workaround?

public class ExpListCursorAdapter extends SimpleCursorTreeAdapter {
    Context mContext;

    public ExpListCursorAdapter(Context context, Cursor cursor,
            int groupLayout, String[] groupFrom, int[] groupTo,
            int childLayout, String[] childFrom, int[] childTo) {
         super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childFrom,
            childTo);
        mContext=context;
}

    @Override
    protected Cursor getChildrenCursor(Cursor groupCursor) {
        int id=groupCursor.getInt(DatabasePazienti.ROWID);
        DatabaseTests mDbTests=new DatabaseTests(mContext);
        mDbTests.open();

        Cursor cursor=mDbTests.fetchPatientTests(id);
        return cursor;
    }

Answer 1

The implementation of SimpleCursorTreeAdapter in the API 2.2 is different from API 2.3.
As you can see in here:

API 2.2

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/widget/SimpleCursorTreeAdapter.java

API 2.3

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3_r1/android/widget/SimpleCursorTreeAdapter.java

When you use API 2.2 it says mContext = context is never called due to the sequence of the methods that are called in the constructor.