Empty page when clicking on crime

Big Nerd Ranch General Discussions
1

Hi All!
I am following the BNR book and up to chapter 11. After I implemented pager then when i click on a crime, i get to an empty white screen.
Here is my CrimeListFragment:
`package com.example.criminalintent;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.core.app.BundleCompat;
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_recycler_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 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 Crime mCrime;
    private TextView mTitleTextView;
    private TextView mDateTextView;
    private CheckBox mSolvedCheckBox;

    public CrimeHolder(LayoutInflater inflater, ViewGroup parent) {
        super(inflater.inflate(R.layout.list_item_crime, parent, false));
        itemView.setOnClickListener((View.OnClickListener) this);
        mTitleTextView = (TextView) itemView.findViewById(R.id.list_item_crime_title_text_view);
        mDateTextView = (TextView) itemView.findViewById(R.id.list_item_crime_date_text_view);
        mSolvedCheckBox = (CheckBox) itemView.findViewById(R.id.list_item_crime_solved_check_box);
    }

    public void bindCrime(Crime crime) {
        mCrime = crime;
        mTitleTextView.setText(mCrime.getTitle());
        mDateTextView.setText(mCrime.getDate().toString());
        mSolvedCheckBox.setChecked(mCrime.isSolved());
    }

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

}

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

    @Override
    public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
        View view = layoutInflater.inflate(R.layout.list_item_crime, parent, false);
        return new CrimeHolder(layoutInflater,parent);
    }

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

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

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

}activity_crime_pager.xml:

<?xml version="1.0" encoding="utf-8"?>

<androidx.viewpager.widget.ViewPager
xmlns:android=“http://schemas.android.com/apk/res/android”
android:id="@+id/activity_crime_pager_view_pager"
android:layout_width=“match_parent”
android:layout_height=“match_parent”>

</androidx.viewpager.widget.ViewPager>`

list_item_crime.xml:
`<?xml version="1.0" encoding="utf-8"?>



`
It was working fine before I implemented the pager.

2

Can you post your CrimePagerActivity.java file?