Crimes created are not displayed after restarting application

Android Programming (3rd Edition) 13. The Toolbar
1

After creating a new crime from the add button of the menu I get a new crime format. When I go back I can see the crime on the list. but, when I restart the application the crime is gone. please help. Thanks in advance.
code snippet below:

package com.example.criminalintent;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class CrimeListFragment extends Fragment {

    private RecyclerView mCrimeRecyclerView;
    private CrimeAdapter mAdapter;
    private boolean mSubtitleVisible;
    public int CurrentPosition;

   @Override
   public void onCreate(Bundle savedInstanceState){
       super.onCreate(savedInstanceState);
       setHasOptionsMenu(true);
   }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        View view = inflater.inflate(R.layout.fragment_crime_list, container, false);

        mCrimeRecyclerView = (RecyclerView) view.findViewById(R.id.crime_recycler_view);
        mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        updateUI();
        return view;
    }


    @Override
    public void onResume() {
        super.onResume();
        updateUI();
    }


    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.fragment_crime_list, menu);

        MenuItem subtitleItem=menu.findItem(R.id.show_subtitle);
        if(mSubtitleVisible){
            subtitleItem.setTitle(R.string.hide_subtitles);
        }
        else{
            subtitleItem.setTitle(R.string.show_subtitles);
        }

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.new_crime:
                Crime crime = new Crime();
                CrimeLab.get(getActivity()).addCrime(crime);
                Intent intent = CrimePagerActivity.newIntent(getActivity(), crime.getId());
                startActivity(intent);
                return true;

            case R.id.show_subtitle:
                mSubtitleVisible=!mSubtitleVisible;
                getActivity().invalidateOptionsMenu();
                updateSubtitle();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
        private void updateSubtitle () {
            CrimeLab crimeLab = CrimeLab.get(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);
        }


        private void updateUI () {
            CrimeLab crimeLab = CrimeLab.get(getActivity());
            List<Crime> crimes = crimeLab.getCrimes();

            if (mAdapter == null) {
                mAdapter = new CrimeAdapter(crimes);
                mCrimeRecyclerView.setAdapter(mAdapter);
            } else {
                mAdapter.notifyDataSetChanged();
            }
            updateSubtitle();
        }


    private class CrimeHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private TextView mTitleTextView;
        private TextView mDateTextView;
        private Crime mCrime;
        private ImageView mSolvedImageView;

        public CrimeHolder(LayoutInflater inflater, ViewGroup parent) {
            super(inflater.inflate(R.layout.list_item_crime, parent, false));
            itemView.setOnClickListener(this);

            mTitleTextView = (TextView) itemView.findViewById(R.id.crime_title);
            mDateTextView = (TextView) itemView.findViewById(R.id.crime_date);
            mSolvedImageView = (ImageView) itemView.findViewById(R.id.crime_solved);
        }

        public void bind(Crime crime) {
            mCrime = crime;
            mTitleTextView.setText(mCrime.getTitle());
            mDateTextView.setText(mCrime.getDate().toString());
            mSolvedImageView.setVisibility(crime.isSolved() ? View.VISIBLE : View.GONE);
        }

        @Override
        public void onClick(View view) {
            Intent intent = CrimePagerActivity.newIntent(getActivity(), mCrime.getId());
            startActivity(intent);
        }
    }

    private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder> {
        private List<Crime> mCrimes;

        public CrimeAdapter(List<Crime> crimes) {
            mCrimes = crimes;
        }

        @Override
        public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater layoutInflater = LayoutInflater.from(getActivity());

            return new CrimeHolder(layoutInflater, parent);
        }

        @Override
        public void onBindViewHolder(CrimeHolder holder, int position) {
            Crime crime = mCrimes.get(position);
            holder.bind(crime);

        }

        @Override
        public int getItemCount() {
            return mCrimes.size();
        }
    }
}
2

When you say “restart the application”, do you mean closing it completely and then reopen the app? If yes, then this is the expected behavior. At this point in the app, there is no persistent storage beyond the life cycle of the application.

In the subsequent chapters you will add a SQLite Database backend that will store all created crimes in memory.

1 Like
3

Jpaone yes I meant completely restarting it. Thanks for your help.