Question

I have a ListPreference which look something like this:

<ListPreference
android:title="Choose item"
android:summary="..."
android:key="itemList"
android:defaultValue="item1"
android:entries="@array/items"
android:entryValues="@array/itemValues" />

Then, I have another preference which should only be enabled if “item3” is selected in the ListPreference.

Can I somehow accomplish this with android:dependency? Something like android:dependency="itemList:item3"

Thanks!

Answer 1

The only way you can do something like this is programmaticly.

You’d have to set up an change listener on the ListPreference and then enable/disable the other one.

itemList = (ListPreference)findPreference("itemList");
itemList2 = (ListPreference)findPreference("itemList2");
itemList.setOnPreferenceChangeListener(new
Preference.OnPreferenceChangeListener() {
  public boolean onPreferenceChange(Preference preference, Object newValue) {
    final String val = newValue.toString();
    int index = itemList.findIndexOfValue(val);
    if(index==3)
      itemList2.setEnabled(true);
    else
      itemList2.setEnabled(false);
    return true;
  }
});

If I were you I wouldn’t even show the second preference if the first isn’t set properly. To do that you have to declare the preference manually (not in the XML) and add/remove it instead of enabling/disabling.

Now isn’t this the bestest answer you’ve ever seen?!

Emmanuel