Question

I’m trying to follow the android docs about multiple selection dialog boxes. I’m having an issue, and I think it’s with the type of arrays i’m trying to load in.

public void addCondition(View view){

         ArrayList<String> mHelperNames= new ArrayList<String>();
           mHelperNames.add("Test Item");
           mHelperNames.add("Test Item");
           mHelperNames.add("Test Item");


           mSelectedItems = new ArrayList();  

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("My Title")
                   .setMultiChoiceItems(mHelperNames, null,
                              new DialogInterface.OnMultiChoiceClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int which,
                               boolean isChecked) {
                           if (isChecked) {

                               mSelectedItems.add(which);
                           } else if (mSelectedItems.contains(which)) {

                               mSelectedItems.remove(Integer.valueOf(which));
                           }
                       }
                   })

                   .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int id) {
                            //Create onlcick method
                       }
                   })
                   .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int id) {
                            //Create onlcick method
                       }
                   });
            builder.show();

    }

Above is my code, but it’s red-line city in eclipse:

In the docs, mSelectedItems is never declared, and I’m not too sure what I’m declaring it as.

The error on .SetMultipleChoiceItems is:

The method setMultiChoiceItems(int, boolean[], DialogInterface.OnMultiChoiceClickListener) in the type AlertDialog.Builder is not applicable for the arguments (ArrayList, null, new DialogInterface.OnMultiChoiceClickListener(){})

But if i change it from a string, how do I show text items in it? Any help will be really appreciated.

Tom

Answer 1

You must provide a CharSequence[] to setMultiChoiceItems method, not an ArrayList.

You could create mHelperNames like this:

CharSequence[] mHelperNames = new CharSequence[] { "test item 1", "test item 2" };

And don’t forget to declare mSelectedItems too:

final List<Integer> mSelectedItems = new ArrayList<Integer>(); 

(It has to be final because you access it from an inner class)

You can also keep mHelperNames as an ArrayList if you need to modify it later. Then you need to convert it to an array when calling setMultiChoiceItems:

    List<CharSequence> mHelperNames = new ArrayList<CharSequence>();
    mHelperNames.add("Test Item 1");
    mHelperNames.add("Test Item 2");

    final List<Integer> mSelectedItems = new ArrayList<Integer>();

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("My Title")
            .setMultiChoiceItems(mHelperNames.toArray(new CharSequence[mHelperNames.size()]), null,
                    new DialogInterface.OnMultiChoiceClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog,
                                int which, boolean isChecked) {
                            if (isChecked) {

                                mSelectedItems.add(which);
                            } else if (mSelectedItems.contains(which)) {

                                mSelectedItems.remove(Integer
                                        .valueOf(which));
                            }
                        }
                    })