How to add data to custom BaseAdapter for listView - Android

Question

I have a custom BaseAdapter class that creates views for comments, usernames, and numbers. This BaseAdapter receives this information from An AsyncTask. The AsyncTask runs w

Answer 1

You try this :

public class Comment {
String username;
String content;
String number;
 }

Class Adapter:

public class CommentAdapter extends BaseAdapter {
private List<Comment> listComment;
private Context context;

public CommentAdapter(List<Comment> listComment, Context context) {
    super();
    this.listComment = listComment;
    this.context = context;
}

@Override
public int getCount() {

    return listComment.size();
}

@Override
public Comment getItem(int position) {
    return listComment.get(position);
}

@Override
public long getItemId(int arg0) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {
        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = mInflater.inflate(R.layout.comment_item, null);
    }

    final TextView textViewUsername = (TextView) v
            .findViewById(R.id.comment_Username);
    final TextView textViewNumber = (TextView) v
            .findViewById(R.id.comment_number);
    final TextView textViewContent = (TextView) v
            .findViewById(R.id.comment_Content);

    final String username = listComment.get(position).getUsername();
    final String number= listComment.get(position).getNumber();
    String content = listComment.get(position).getContent();

    textViewUsername.setText(username);
    textViewNumber.setText(number);

    textViewContent.setText(content);
    return v;
}

}

When you need to add new comment to list. just create new Comment and add to listComment(listComment.add(newComment)), after that, call adapter.notifyDataSetChanged();

Answer 2

package com.example.baseadapter;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity implements OnItemClickListener {
    public static final String[] title = new String[] {
            "image 1", "image 2", "image 3", "image 4"
    };

    public static final Integer[] images = {
            R.drawable.aa, R.drawable.bb, R.drawable.cc, R.drawable.cc, R.drawable.dd
    };

    ListView listview;

    List<RowItem> rowItems;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rowItems = new ArrayList<RowItem>();
        for (int i = 0; i < title.length; i++) {
            RowItem item = new RowItem(images[i], title[i]);
            rowItems.add(item);
        }
        listview = (ListView)findViewById(R.id.listview);
        customBaseAdapter cba = new customBaseAdapter(this, rowItems);
        listview.setAdapter(cba);
        listview.setOnItemClickListener(this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        Toast.makeText(getApplicationContext(), "item selected", Toast.LENGTH_LONG).show();
    }

    public class customBaseAdapter extends BaseAdapter {
        Context context;

        List<RowItem> rowItem;

        public customBaseAdapter(Context context, List<RowItem> listItem) {
            this.context = context;
            rowItem = listItem;
            Log.d("const", "const");
        }

        @Override
        public int getCount() {
            Log.d("count", "count");
            return rowItem.size();
        }

        @Override
        public Object getItem(int arg0) {
            Log.d("item", "item");
            return rowItem.get(arg0);
        }

        @Override
        public long getItemId(int position) {
            Log.d("const", "item id");
            return rowItem.indexOf(getItem(position));
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            Log.d("const", "getview");
            LayoutInflater inflater = (LayoutInflater)context
                    .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            RowItem rowitem = (RowItem)getItem(position);
            TextView textForTitle;
            ImageView imgForImage;
            convertView = inflater.inflate(R.layout.inflate, null);
            textForTitle = (TextView)convertView.findViewById(R.id.textview);
            imgForImage = (ImageView)convertView.findViewById(R.id.imageview);
            textForTitle.setText(rowitem.getTitle());
            imgForImage.setImageResource(rowitem.getImageId());

            return convertView;
        }
    }

    public class RowItem {
        int imageId;

        String title;

        public RowItem(int imageId, String title) {
            this.imageId = imageId;
            this.title = title;
        }

        public int getImageId() {
            return imageId;
        }

        public void setImageId(int imageId) {
            this.imageId = imageId;
        }

        public String getTitle() {
            return title;
        }

        public void setStringTitle(String title) {
            this.title = title;
        }

        @Override
        public String toString() {
            return title;
        }
    }

}