Question

I’m populating a ListView which contains an ImageView and a TextView. It doesn’t crash, but doesn’t show anything either. I see a lot of tutorials but appear to show the same code as I am using.

This is the row.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/fondo_fila_click"
    android:orientation="horizontal"
    android:padding="5dip" >

    <LinearLayout android:id="@+id/thumbnail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="3dip"
        android:layout_alignParentLeft="true"
        android:background="@drawable/borde_foto"
        android:layout_marginRight="5dip">

        <ImageView
            android:id="@+id/imagen_marca"
            android:layout_width="50dip"
            android:layout_height="50dip"/>

    </LinearLayout>

    <TextView
        android:id="@+id/nombre"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/thumbnail"
        android:layout_toRightOf="@+id/thumbnail"
        android:textColor="#040404"
        android:typeface="sans"
        android:textSize="15dip"
        android:textStyle="bold"/>


</RelativeLayout>

And the code:

   public class SATActivity extends SherlockListActivity {

private IconListViewAdapter adaptador;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);  

        ArrayList m_fabricante = new ArrayList();
        this.adaptador = new IconListViewAdapter(this, R.layout.fila, m_fabricante);
        setListAdapter(this.adaptador);         
        iniciaFabricantes();         
    }

    @SuppressWarnings("unchecked")
    private void iniciaFabricantes() {
        ArrayList m_fabricante = new ArrayList();

        try {
            Fabricante acer = new Fabricante();
            acer.setNombre("Acer");
            acer.setFoto(R.drawable.acer);
            Fabricante apple = new Fabricante();
            apple.setNombre("Apple");
            apple.setFoto(R.drawable.apple);

            m_fabricante.add(acer);
            m_fabricante.add(apple);
        } catch (Exception e) {

        }

        adaptador.notifyDataSetChanged();
    } 

    public class IconListViewAdapter extends ArrayAdapter<Fabricante> {

        private ArrayList<Fabricante> items;

        public IconListViewAdapter(Context context, int textViewResourceId, ArrayList<Fabricante> items) {
            super(context, textViewResourceId, items);
            this.items = items;
        }

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

            Fabricante o = items.get(position);
            if (o != null) {

                //poblamos la lista de elementos

                TextView tt = (TextView) v.findViewById(R.id.nombre);
                ImageView im = (ImageView) v.findViewById(R.id.imagen_marca);

                if (im!= null) {
                    im.setImageResource(o.getFoto());
                }      

                if (tt != null) {             
                    tt.setText(o.getNombre());                             
                }                                                       
            }
            return v;
        }
    }   
}

Does anyone know why it doesn’t show the text or the images?

Thanks

Answer 1

Try changing your adapter class to below one:

public class IconListViewAdapter extends ArrayAdapter<Fabricante> {

        private ArrayList<Fabricante> items;
        LayoutInflater mInflater;

        public IconListViewAdapter(Context context, int textViewResourceId, ArrayList<Fabricante> items) {
            super(context, textViewResourceId, items);
            this.items = items;
            mInflater = LayoutInflater.from(context);
        }

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

            final ViewHolder holder; 

            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.row, null);
                holder = new ViewHolder();

                holder.mTextView=(TextView)convertView.findViewById(R.id.nombre);
                holder.mImageView=(ImageView)convertView.findViewById(R.id.imagen_marca);
                convertView.setTag(holder);
            }
            else
                holder=(ViewHolder)convertView.getTag();

            Fabricante o = items.get(position);
            if (o != null) {

                //poblamos la lista de elementos

                holder.mImageView.setImageResource(o.getFoto());

                holder.mTextView.setText(o.getNombre());                             

            }
            return convertView;
        }
        static class ViewHolder
        {                
            TextView mTextView;
            ImageView mImageView;
        }    

    }