/** Set the subtitle of the toolbar. */
private void updateSubtitle() {
CrimeLab crimeLab = CrimeLab.getInstance(getActivity());
int crimeCount = crimeLab.getCrimes().size();
String subtitle = getString(R.string.subtitle_format, crimeCount);
if (!mSubtitleVisible) {
subtitle = null;
}
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.getSupportActionBar().setSubtitle(subtitle);
}
/** Update the list. */
private void updateUI() {
CrimeLab crimeLab = CrimeLab.getInstance(getActivity());
List<Crime> crimes = crimeLab.getCrimes();
if (mAdapter == null) {
mAdapter = new CrimeAdapter(crimes);
mRecyclerViewCrime.setAdapter(mAdapter);
} else {
// mCrimes is gone. So the List<Crime> returned by getCrimes()
// is a snapshot of the Crimes at one point in time.
// we need to update the List<Crime> in the adapter in case user has edited a crime
mAdapter.setCrimes(crimes);
mAdapter.notifyDataSetChanged();
}
// update subtitle after rotation
updateSubtitle();
}
/**
* Response to add crime action button.
*
* <p>Toggling the action item subtitle.
*
* @param item
* @return
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_item_new_crime:
Crime crime = new Crime();
CrimeLab.getInstance(getActivity()).addCrime(crime);
Intent intent = CrimePagerActivity.newIntent(getActivity(), crime.getId());
startActivity(intent);
return true;
case R.id.menu_item_show_subtitle:
mSubtitleVisible = !mSubtitleVisible;
getActivity().invalidateOptionsMenu();
updateSubtitle();
return true;
default:
return super.onOptionsItemSelected(item);
}
}