How to get selected item of a singlechoice Alert D

问题:

I have this code to show a dialog with singlechoice(radio) options.

AlertDialog ad = new AlertDialog.Builder(this)
.setCancelable(false)
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(R.string.choose_one)
.setSingleChoiceItems(seq, pos,null)
.setPositiveButton( R.string.ok, new DialogInterface.OnClickListener() { 
  public void onClick( DialogInterface dialog, int whichButton) 
  { 
    // dialog dismissed
  } 
 }).create();

How do I get the choice that has been selected?

回答1:

I know this is an old post, but i just came across it, and found that this solution seems at bit more simple that whats been posted here.

You can just do like this:

In your onClick() handler on the dialog positive button, add the following code:

ListView lw = ((AlertDialog)dialog).getListView();
Object checkedItem = lw.getAdapter().getItem(lw.getCheckedItemPosition());

回答2:

I tried to use ListView.setSelection(int) but it never worked as expected so instead I decided to make use of View.setTag() to temporarily store the selected position.

.setSingleChoiceItems(adapter, -1,
        new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            ListView lv = ((AlertDialog)dialog).getListView();
            lv.setTag(new Integer(which));
        }
})

The tag can then be accessed easily after a button click.

.setPositiveButton(R.string.button_text,
    new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        ListView lv = ((AlertDialog)dialog).getListView();
        Integer selected = (Integer)lv.getTag();
        if(selected != null) {
            // do something interesting
        }
    }
})

回答3:

I believe that you use an OnClickListener for setSingleChoiceItems(), to listen whenever an item has been selected; then once the user hits okay, you set that item in stone. Right now you're just passing null, so nothing you can't pick up which item was selected.

回答4:

1). create Array.

final ArrayList<String> arrData = new ArrayList<String>();

2). add data to array you have created.

if (cursor != null) {
            if (cursor.moveToFirst()) {
                do {

                    arrData .add(cursor.getString(1)); 
                                             // (1 = int columnIndex)

                } while (cursor.moveToNext());
            }
        }

3). get data like this.

public void onClick(DialogInterface dialog, int item) {

                        Log.d("Selected", arrData.get(item) + "");

                    }

4). that's all :)

回答5:

position of the selected element is already given in the onClick method. so we can directly access the the array and get the selected item without any hassle. in this case: seq[which] will be the selected item.

回答6:

You can do just like this in on onClick() method

final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(R.string.edit_set_waiting_period)
                .setItems(R.array.str_set_waiting_period, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // The 'which' argument contains the index position
                        // of the selected item
                        L.e("selectedItmes", which + "");

                        ListView lw = ((AlertDialog) dialog).getListView();
                        Object checkedItem = lw.getAdapter().getItem(which);
                        L.e("checkedItem", checkedItem.toString() + "");

                    }
                });

        builder.show();

回答7:

EditText et = (EditText)findViewById(R.id.editText9);

int a = Integer.valueOf(item);

et.setText(items[a]);