Nrthugu

I've created my own custom adapter for a ListView that is in a fragment. I believe I have everything correct, but it still throws an error when launching my app and it crashes. I tried to debug it, but ended up not being able to locate the issue.

Here's my code for the fragment:

public class TabFragment0 extends Fragment {



Button addPR;

ArrayList<PRObject> PRList;

PRObjectAdapter PRListAdapter;

private ListView listViewer;

private final String PRKey = "PRArgs";



public TabFragment0() {

    // Required empty public constructor

}



@Nullable

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

                         Bundle savedInstanceState) {

    // Inflate the layout for this fragment

    View view = inflater.inflate(R.layout.tab_personalrecords, container, 

        false);

    if(loadList(PRKey) != null) {

        PRList = loadList(PRKey);

    }

    PRListAdapter = new PRObjectAdapter(getActivity(), PRList);

    listViewer = (ListView) view.findViewById(R.id.prListView);

    listViewer.setAdapter(PRListAdapter);

...................................................

The line listViewer.setAdapter(PRListAdapter); is what throws the error. I've also tried PRListAdapter = new PRObjectAdapter(this.getActivity(), PRList); as wel as PRListAdapter = new PRObjectAdapter(getContext(), PRList); to no avail.

Here's my code for the adapter class:

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.EditText;

import android.widget.TextView;

import java.util.ArrayList;



public class PRObjectAdapter extends BaseAdapter {



private LayoutInflater inflater;

private ArrayList<PRObject> objects;



private class ViewHolder {

    TextView textview1;

    TextView textview2;

}



public PRObjectAdapter(Context context, ArrayList<PRObject> objects) {

    inflater = LayoutInflater.from(context);

    this.objects = objects;

}



@Override

public int getCount() {

    return objects.size();

}



@Override

public Object getItem(int position) {

    return objects.get(position);

}



@Override

public long getItemId(int position) {

    return position;

}



@Override

public View getView(int position, View convertView, ViewGroup parent) {

    PRObjectAdapter.ViewHolder holder = null;

    if(convertView == null) {

        holder = new PRObjectAdapter.ViewHolder();

        convertView = inflater.inflate(R.layout.pr_item_layout, null);

        holder.textview1 = (TextView) 

                   convertView.findViewById(R.id.prTitleTV);

        holder.textview2 = (TextView) 

                   convertView.findViewById(R.id.prNumTV);

        convertView.setTag(holder);

    } else {

        holder = (PRObjectAdapter.ViewHolder) convertView.getTag();

    }

    holder.textview1.setText(objects.get(position).getTitle());

    holder.textview2.setText(objects.get(position).getNum());

    return convertView;

}

}

I want to say that the issue is in my View getView method, but I can't pinpoint the issue.
Any help would be greatly appreciated.

EDIT:

This question is not a duplicate of
this NullPointerException question

My question specifically pertains to the fragment/customAdapter combination in Android Studio, whereas the above link is just a guide on what a NPE is and how to fix it.

Okay so it turns out nothing was wrong with the adapter class, it works perfectly as intended. My problem was that:

ArrayList<PRObject> PRList;

was set without being initialized in my fragment class.

The fix was to change it to:

ArrayList<PRObject> PRList = new ArrayList<PRObject>();

The view now loads as intended. Hopefully someone can make use out of my adapter class then since it works, hahah

Cheers everyone!