Come posso impostare drawable ad un controllo ListView in Android

Question

sto scrivendo un app per Android 1.5.  Voglio usare un listview complesso per visualizzare i miei dati.  Voglio mostrare un ImageView di un oggetto drawable nel mio oggetto List.

ho imparato da un demo:

------> listData.put("Img", listData.put("Img", R.drawable.XXX));
listData.put("Time", "100");
listItems.add(listData);

E 'possibile visualizzare in modo corretto, però, voglio cambiare Img in fase di esecuzione, l'immagine forse generata in fase di esecuzione, in modo da modificare il codice come segue, ma cade. Qualcuno può aiutarmi ? molte grazie!

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.item_list);
    itemListView = (ListView) findViewById(R.id.listview);
    ArrayList<HashMap<String, Object>> listItems = new ArrayList<HashMap<String, Object>>();
    for(int i = 0;i <XXX.size(); ++i) {
        HashMap<String, Object> listData = new HashMap<String, Object>();
--------->/*1)*/  listData.put("Img", new Drawable(XXX));
        /*2)*/  listData.put("Time", "100");
        /*3)*/  listItems.add(listData);
    }
    SimpleAdapter listItemAdapter = new SimpleAdapter(this, listItems, R.layout.listitem, new String[] { "Img", "Time"}, new int[] { R.id.listitem_img, R.id.listitem_time });
    itemListView.setAdapter(listItemAdapter);
}

listitem.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    android:layout_width="fill_parent" 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content" 
    android:paddingBottom="4dip"
    android:paddingLeft="12dip" 
    android:paddingRight="12dip">

    <ImageView 
        android:id="@+id/listitem_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="12dip"/>

    <TextView
        android:id="@+id/listitem_time" 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textSize="20dip" />

</LinearLayout>

Answer 1

Prova questa, mi ha aiutato.

public class AndroidList extends ListActivity {

public class MyCustomAdapter extends ArrayAdapter<String> {

 public MyCustomAdapter(Context context, int textViewResourceId,
   String[] objects) {
  super(context, textViewResourceId, objects);
  // TODO Auto-generated constructor stub
 }

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

  View row = convertView;

  if(row==null){
   LayoutInflater inflater=getLayoutInflater();
   row=inflater.inflate(R.layout.row, parent, false);
  }

  TextView label=(TextView)row.findViewById(R.id.weekofday);
  label.setText(month[position]);
  ImageView icon=(ImageView)row.findViewById(R.id.icon);

  if (month[position]=="December"){
   icon.setImageResource(R.drawable.icon);
  }
  else{
   icon.setImageResource(R.drawable.icongray);
  }

  return row;
 }
}

String[] month = {
     "January", "February", "March", "April",
     "May", "June", "July", "August",
     "September", "October", "November", "December"
   };

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      //setContentView(R.layout.main);
      /*setListAdapter(new ArrayAdapter<String>(this,
        R.layout.row, R.id.weekofday, DayOfWeek));*/
      setListAdapter(new MyCustomAdapter(AndroidList.this, R.layout.row, month));
  }

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
 // TODO Auto-generated method stub
 //super.onListItemClick(l, v, position, id);
 String selection = l.getItemAtPosition(position).toString();
 Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
}

}

trovato qui: http: //android-er.blogspot.com/2010/06/using-convertview-in-getview-to-make.html