android - Multiple choice AlertDialog with custom Adapter

Question

I am trying to create a AlertDialog with multiple choice option. I have tried with the setMultiChoiceItems but what i have is a ArrayList<Category> and not a CharSequence so i tried with the adapter.

The problem with setAdapter is that when i select one item it closes the dialog window. And what i want is to select the items and then hit the OK button to see what items where selected.

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Pick a color");
        ArrayAdapter<Category> catsAdapter = new ArrayAdapter<Category>(this, android.R.layout.select_dialog_multichoice,this.categories);
        builder.setAdapter(catsAdapter, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {

            }
        });
        builder.setPositiveButton("Save", new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                //do something  
               }                
        });;

        AlertDialog alert = builder.create();
        alert.show();

Answer 1

Unfortunately, there doesn't seem to be an easy way to toggle on AlertDialog's multichoicemode without calling setMultiChoiceItems().

However, you can set an adapter, then turn on multichoice mode in the contained ListView itself.

final AlertDialog dialog = new AlertDialog.Builder(getActivity())
    .setTitle("Title")
    .setAdapter(yourAdapter, null)
    .setPositiveButton(getResources().getString(R.string.positive), null)
    .setNegativeButton(getResources().getString(android.R.string.cancel), null)
    .create();

dialog.getListView().setItemsCanFocus(false);
dialog.getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
dialog.getListView().setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view,
        int position, long id) {
        // Manage selected items here
        System.out.println("clicked" + position);
        CheckedTextView textView = (CheckedTextView) view;
        if(textView.isChecked()) {

        } else {

        }
    }
});

dialog.show();