Wie kann ich ziehbar zu einem Listview in Android

Question

Ich bin eine App für Android 1.5 zu schreiben.  Ich möchte eine komplexe Listenansicht verwenden, um meine Daten anzuzeigen.  Ich möchte in meiner Liste item ein Image eines ziehbar Objekt zeigen.

ich aus einem Demo gelernt:

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

Es kann richtig angezeigt, jedoch möchte ich Img zur Laufzeit ändern, das Bild vielleicht zur Laufzeit generiert, so dass ich den Code wie folgt ändern, aber es fällt. Kann mir jemand helfen ? vielen Dank!

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

Dieses Probieren Sie hat es mir geholfen.

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();
}

}

finden Sie hier: http: //android-er.blogspot.com/2010/06/using-convertview-in-getview-to-make.html