Pressing back does not create a new Crime

Android Programming (3rd Edition) 14. SQLite Databases
1

In the part that says Refreshing model data I add the setCrimes and call it in the updateUI(), but it does not update the CrimeListFragment view. Rather, if I make a new crime and press the Up button, then it now shows the crime I just made and the one that never showed. I also did the challenge in Ch 10, so my code looks like this:

if (mAdapter == null) {
    mAdapter = new CrimeAdapter(crimes);
    mCrimeRecyclerView.setAdapter(mAdapter);
} else {
    if (mCrimePosition != -1) {
        mAdapter.setCrimes(crimes); // code that isn't working
        mAdapter.notifyItemChanged(mCrimePosition);
        mCrimePosition = -1;
    }
}

Do I have to completely change my code to accommodate the RecyclerView reloading code, or is it just in the wrong place? I have put it in a couple different places to no avail.

2

I’m guessing it’s because you are using the notifyItemChanged method rather than notifyDataSetChanged. Maybe you have an issue with the mCrimePosition that is used?

3

Yes! You pointing out the notifyDataSetChanged call made me go back and realize that I never updated the model if the adapter position never changed which would need a notifyDataSetChanged call. I changed it to have an else with the if that called it with a setCrimes call before that. Thank you!