End of chapter 11- View starts with Crime #0 page rather than the crimelist

Android Programming (3rd Edition) 11. Using ViewPager
1

Hi. According to page 222, the app should display the crime list. My app is named CrimeActivity. Here is my code:

package com.bignerdranch.android.crimeactivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;

import java.util.List;
import java.util.UUID;

public class CrimePagerActivity extends AppCompatActivity {
private static final String EXTRA_CRIME_ID =
“com.bignerdranch.android.crimeactivity.crime_id”;

private ViewPager mViewPager;
private List<Crime> mCrimes;

public static Intent newIntent(Context packageContext, UUID crimeId) {
    Intent intent = new Intent(packageContext, CrimePagerActivity.class);
    intent.putExtra(EXTRA_CRIME_ID, crimeId);
    return intent;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_crime_pager);

    UUID crimeId = (UUID) getIntent().getSerializableExtra(EXTRA_CRIME_ID);

    mViewPager = (ViewPager) findViewById(R.id.crime_view_pager);

    mCrimes = CrimeLab.get(this).getCrimes();
    FragmentManager fragmentManager = getSupportFragmentManager();
    mViewPager.setAdapter(new FragmentPagerAdapter(fragmentManager, 0) {

        @Override
        public Fragment getItem(int position) {
            Crime crime = mCrimes.get(position);
            return CrimeFragment.newInstance(crime.getId());
        }

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

    });

    for ( int i = 0; i < mCrimes.size(); i++ ) {
        if (mCrimes.get(i).getId().equals(crimeId)) {
           mViewPager.setCurrentItem(i);
           break;
        }
    }
}

}

AND:

package com.bignerdranch.android.crimeactivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class CrimeListFragment extends Fragment {
private RecyclerView mCrimeRecyclerView;
private CrimeAdapter mAdapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) {
    View view = inflater.inflate(R.layout.fragment_crime_list, container, false);

    mCrimeRecyclerView = (RecyclerView) view.findViewById(R.id.crime_recycle_view);
    mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

    updateUI();

    return view;
}

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

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();
    }
}

private class CrimeHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    private TextView mTitleTextView;
    private TextView mDateTextView;
    private ImageView mSolvedImageView;

    private Crime mCrime;

    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();
    }
}

}

Thanks for your help !

2

Sorry this was asked earlier