How to implement CustomAdapter in ListView Acitivity

Question

I want image before textview and want to customize TextView in each row but it is hard for me to implement it because there is already xml such layout file simple_li

Answer 1

Create a custom_item inside layout folder

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/listItemImgView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/done"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/listItemTxtView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

</LinearLayout>

Create a custom adapter like this

public class CustomAdapter extends ArrayAdapter<Tweet> {

    private Context mContext;
    private int layoutId;
    private ArrayList<Tweet> dataList;

    public CustomAdapter(Context context, int resourceId,
            ArrayList<Tweet> objects) {
        super(context, resourceId, objects);
        // TODO Auto-generated constructor stub
        mContext = context;
        layoutId = resourceId;
        dataList = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder viewHolder;
        if(convertView == null) {
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(layoutId, null);
            viewHolder = new ViewHolder();
            viewHolder.listItemTxtView = (TextView) convertView.findViewById(R.id.listItemTxtView);
            viewHolder.listItemImgView = (ImageView) convertView.findViewById(R.id.listItemImgView);

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.listItemTxtView.setText(dataList.get(position).toString());
        //place picasso jar into libs folder of your project and use it for download and  set images like this
        Picasso.with(context).load("url of image you want to load").into(viewHolder.listItemImgView);
        return convertView;
    }

    private class ViewHolder {
        TextView listItemTxtView;
        ImageView listItemImgView;
    }
}

download picasso jar from here

instead of this

ArrayAdapter<Tweet> adapter = new ArrayAdapter<Tweet>(activity, android.R.layout.simple_list_item_1, twits);
setListAdapter(adapter);

Use this

CustomAdapter adapter = new CustomAdapter(MainActivity.this, R.layout.custom_item, twits);
setListAdapter(adapter);