Question

I have experience getting ListAdapters working, and have looked online for tutorials on custom adapters to interface with a GridView, but I can’t seem to get mine working. I’m receiving a NullPointerException on my line:

image.setBackgroundColor(Color.GREEN);

My Activity and Adapter are as follows:
FixtureActivity:

package net.blakely.paul.Hyperion;

import android.os.Bundle;
import android.widget.GridView;
import com.actionbarsherlock.app.SherlockActivity;

public class FixtureActivity extends SherlockActivity {


    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fixtures);
        FixtureItemAdapter fia = new FixtureItemAdapter(this, 6);
        GridView grids = (GridView) findViewById(R.id.grids);
        grids.setAdapter(fia);

        }

}

FixtureItemAdapter:

package net.blakely.paul.Hyperion;

import android.app.Activity;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class FixtureItemAdapter extends BaseAdapter {

    private Activity context;
    public int size;
    private ImageView image;
    private TextView label;

    public FixtureItemAdapter(Activity context, int size) {
        super();
        this.context = context;
        this.size = size;
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return size;
    }

    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }



    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub


        Log.v("Hyperion","convertView is Null?="+Boolean.toString(convertView==null));
        if (convertView == null) {
            LayoutInflater inflater = context.getLayoutInflater();
            convertView = (LinearLayout) inflater.inflate(net.blakely.paul.Hyperion.R.layout.outputitem, null, true);

            image = (ImageView) convertView.findViewById(net.blakely.paul.Hyperion.R.id.imageView1);
            Log.v("Hyperion","image is Null?="+Boolean.toString(image==null));
            label = (TextView) convertView.findViewById(net.blakely.paul.Hyperion.R.id.textView2);


        } 

        // Decide which channel this is and set information accordingly

        image.setBackgroundColor(Color.GREEN);
        label.setText("LABEL");

        return convertView;
    }

}

Any help with this issue would be much appreciated. For what it’s worth. I’ve found that I get the NPE on the first run through the adapter, when convertView is null, and image winds up being null as well.

Answer 1

I’m sorry, but I found out my problem. It turned out that I was calling the wrong xml file, outputitem instead of fixtureitem, since I had copied that line from a different ListAdapter in the program. Thanks for your answers.