[SOLVED] Android: Two-line list view with radio buttons, can’t select items

Android: Two-line list view with radio buttons, can’t select items

I would like to display a list of paired Bluetooth devices and let the user select one. I’m trying to create a two-line list view (one line for the friendly device name, the other for the MAC address) with radio buttons.

To this end I have copied simple_list_item_2_single_choice.xml into my project and create my list view with the following code:

listView = new ListView(activity);
listView.setItemsCanFocus(false);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
ArrayAdapter<BluetoothDevice> listViewAdapter = new ArrayAdapter<BluetoothDevice>(activity,
    R.layout.simple_list_item_2_single_choice, android.R.id.text1) {
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        TextView text1 = (TextView) view.findViewById(android.R.id.text1);
        TextView text2 = (TextView) view.findViewById(android.R.id.text2);

        text1.setText(getItem(position).getName());
        text2.setText(getItem(position).getAddress());
        return view;
    }
};
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> devices = btAdapter.getBondedDevices();
// addAll() is not supported on APIs below 11
for (BluetoothDevice device : devices)
    listViewAdapter.add(device);
listView.setAdapter(listViewAdapter);

This displays the list the way I want it, but I can’t select any items (the radio button stays empty when I tap an item). What gives?

Solution

Not sure how this worked in AOSP (they might use non-standard logic for the layout), but with a standard list view the key is that the root item of the View must implement the Checkable interface.

So, based on this answer, I did the following:

Created a CheckableLayout, derived from LinearLayout, otherwise just as described in the answer
Changed the top-level view in my copy of simple_list_item_2_single_choice.xml to CheckableLayout (this requires a fully qualified class name).

With these changes it works as intended. I can check items by tapping them, and the items will behave like a group of radio buttons.