How can a button click method find out which item is selected in a ListView?

Posted by Ian Bayley on Stack Overflow See other posts from Stack Overflow or by Ian Bayley
Published on 2010-09-08T13:05:46Z Indexed on 2011/01/12 14:53 UTC
Read the original article Hit count: 184

Filed under:
|
|

I have a single screen with a bank of buttons below a ListView. Entries on the ListView light up in orange when I scroll so I assume that are selected. When I then press the "Delete" button I want the onClickListener to remove the currently selected entry. But getSelectedItemPosition() always gives me -1. If I can't hope to use the GUI controls in this way, please give me another way of getting the same result.

I have even tried setting the onClickListener of the List View to store the index before the button is pressed (in case pressing the button unselects the entry) but even that is always -1 it seems.

Here's the code (without the modification which didn't work)

package com.bayley;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;

/**
 *
 * @author p0074564
 */
public class September extends Activity {

 /** Called when the activity is first created. */


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

  final ListView myListView = (ListView) findViewById(R.id.myListView);
  Button addButton = (Button) findViewById(R.id.AddButton);
  Button deleteButton = (Button) findViewById(R.id.DeleteButton);
  final EditText editText = (EditText) findViewById(R.id.myEditText);

  final ArrayList<String> todoItems = new ArrayList<String>();
  todoItems.add("Monday");
  todoItems.add("Tuesday");
  todoItems.add("Wednesday");

  final ArrayAdapter<String> aa =
   new ArrayAdapter<String>(this,
     android.R.layout.simple_list_item_1, todoItems);
  myListView.setAdapter(aa);

  addButton.setOnClickListener(new 
    Button.OnClickListener() {
   public void onClick(View v) {
    todoItems.add(editText.getText().toString());
    aa.notifyDataSetChanged();
   }
  });


  deleteButton.setOnClickListener(new 
    Button.OnClickListener() {
   public void onClick(View v) {
    // always returns -1 unfortunately ie nothing is ever selected
    int index = myListView.getSelectedItemPosition();
    if (index >= 0) {
     todoItems.remove(index);
    }
    aa.notifyDataSetChanged();
   }
  });



 }
}

© Stack Overflow or respective owner

Related posts about java

Related posts about android