How to pass multiple array values in a Custom Adapter class for Custom List View?

Question

I have a list view with an image icon on the left and three text views on the right in a single row. I have created the layout, but while creating the adapter class I am facing some issues. Here is the code:

import android.app.Activity;
import android.widget.ArrayAdapter;

public class CustomList extends ArrayAdapter<String>{

    private final Activity context;
    private final String[][] listRow;
    private final Integer[] imageId;

    public CustomList(Activity context, String[][] listRow, Integer[] imageId){
        super(context, R.layout.rowlayout, listRow);
    }
}

First I created three 1D arrays for the three textviews, but in the constructor I was not able to pass them all.

So I had to create a 2D array where every row in the table would represent information about a single list view item.

But I am not able to do so. I get an error:

Cannot resolve method super(android.app.Activity, int, java.lang.String[][]) with 2D arrays

How do I solve this issue?

I'm not a java dev but shouldn't it be ArrayAdapter<String[]> so that your listRow matches the type of the third parameter of the super class constructor? — rene
– rene, Commented Apr 20, 2015 at 13:12
The error tells you everything. There's no matching super constructor that takes the arguments you're trying to give it. developer.android.com/reference/android/widget/… — user562566
– user562566, Commented Apr 20, 2015 at 13:46
@TechnikEmpire yes I understand. But is there a way to pass multiple arrays or a 2d array to achieve the listview I wanted? — Java Enthusiast
– Java Enthusiast, Commented Apr 20, 2015 at 14:15
@Chaosit can you please post an answer using the same so that we can have two alternate solutions? — Java Enthusiast
– Java Enthusiast, Commented Apr 21, 2015 at 14:54

BartoszKP · Accepted Answer · 2015-04-21 14:48:48Z

23

After trying for a long time, I found the solution. I created a separate class to store the data values for each individual row and created an array of objects of the same.

Here is the sample code:

import android.app.Activity;
import android.widget.ArrayAdapter;

class ListItem
{
    public String textview1;
    public String textview2;
    public String textview3;
    public int imageId;

    public ListItem(String t1, String t2, String t3, int imageId)
    {
        this.textview1 = t1;
        this.textview2 = t2;
        this.textview3 = t3;
        this.imageId = imageId;
    }
}

public class CustomList extends ArrayAdapter<Object>
{
    private Activity context;
    private ListItem listItem[];

    public CustomList(Activity context, ListItem li[])
    {
        super(context, R.layout.rowlayout, li);    
    }
}

edited Apr 21, 2015 at 14:48

BartoszKP

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answered Apr 20, 2015 at 15:20

Java Enthusiast

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2 Comments

Sufian Over a year ago

Good approach. Creating objects for storing data in more readable/OOP-ish way of doing things. This way you filter out possible confusions in the future.

Prashanth Debbadwar Over a year ago

Instead of making attribute public it is better to use get and setter methods. This is more preferred approach because we should not make our attributes public.

Prashanth Debbadwar · Accepted Answer · 2015-04-23 13:04:04Z

2

Create a model class(separately) which contains all the three fields which are required. Then create arraylist in your activity and add items to it. pass this arraylist to adapter it works.

answered Apr 23, 2015 at 13:04

Prashanth Debbadwar

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1 Comment

Praxis Ashelin Over a year ago

You can improve your answer by adding some example code, explaining how it works, or adding links to documentation which explains the code you use. A detailed answer like that is more likely to help others and will get you more upvotes as well ;)

Prashant · Accepted Answer · 2018-03-24 19:00:59Z

In my case, I changed ArrayAdapter and It is working You can change this code

import android.app.Activity;
import android.widget.ArrayAdapter;

public class CustomList extends ArrayAdapter<String[]>{

    private final Activity context;
    private final String[][] listRow;
    private final Integer[] imageId;

    public CustomList(Activity context, String[][] listRow, Integer[] imageId){
        super(context, R.layout.rowlayout, listRow);
    }
}

My code sample

public class CustomAdepter extends ArrayAdapter<String[]> {
    public CustomAdepter(@NonNull Context context, String[][] message) {
        super(context, R.layout.message_list, message);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(getContext());
        View customView = inflater.inflate(R.layout.message_list, parent, false);
        String singleMessage = getItem(position)[2];
        TextView textView = (TextView) customView.findViewById(R.id.firstLine);
        textView.setText(singleMessage);
        return customView;
    }
}

See the change in ArrayAdapter<String[]>, String[][] message and String singleMessage = getItem(position)[2];

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