How to create RadioButton group in preference.xml window?

If you need just to enable or disable using PIN, only one CheckBoxPreference will be enough in this case (see example code below, First Category). RadioButtons are usually used, when you need to choose something from a list of settings (ListPreference) - for example (see example code, Second Category), to pick a color.

<?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">    <PreferenceCategory        android:title="First Category">        <CheckBoxPreference            android:title="Using PIN"            android:defaultValue="false"            android:key="checkboxPref"             android:summaryOn="Disable PIN"             android:summaryOff="Enable PIN"/>    </PreferenceCategory>    <PreferenceCategory        android:title="Second Category">        <ListPreference            android:title="Pick your favourite color"            android:key="listPref"            android:defaultValue="4"            android:entries="@array/listArray"            android:entryValues="@array/listValues" />    </PreferenceCategory></PreferenceScreen>

The source code for this example will be:

public class PreferencesHelpExample extends PreferenceActivity implements OnSharedPreferenceChangeListener {    public static final String KEY_LIST_PREFERENCE = "listPref";    private ListPreference mListPreference;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.preferences);        // Get a reference to the preferences        mListPreference = (ListPreference)getPreferenceScreen().findPreference(KEY_LIST_PREFERENCE);    }    @Override    protected void onResume() {        super.onResume();        // Setup the initial values        mListPreference.setSummary("Current value is " + mListPreference.getEntry().toString());        // Set up a listener whenever a key changes                    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);    }    @Override    protected void onPause() {        super.onPause();        // Unregister the listener whenever a key changes                    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);        }    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {        // Set new summary, when a preference value changes        if (key.equals(KEY_LIST_PREFERENCE)) {            mListPreference.setSummary("Current value is " + mListPreference.getEntry().toString());         }    }}

For ListPreference you will also need an arrays.xml file, which is located in the "values" folder:

<?xml version="1.0" encoding="utf-8"?><resources>    <string-array name="listArray">        <item>red</item>        <item>orange</item>        <item>yellow</item>        <item>green</item>        <item>blue</item>        <item>violet</item>    </string-array>    <string-array name="listValues">        <item>1</item>        <item>2</item>        <item>3</item>        <item>4</item>        <item>5</item>        <item>6</item>    </string-array></resources>

See also some great examples, working with PreferenceActivity - they helped me a lot:

Android Preferences;
How to create a group of RadioButtons instead of a list;
How to display the current value of an Android Preference in the Preference summary?

In some situations, having Preferences behave as radio buttons is a nice feature e.g a simple way of including summary text under each option.

Making a group of checkboxes behave like a group of radio buttons is fairly simple. To do this in Preferences, register all the checkboxes in the group to the same OnPreferenceChangeListener then in this listener use findPreference() to find the other checkboxes and call setChecked(false);

public boolean onPreferenceChange(Preference preference, Object newValue) {    String key = preference.getKey();    if (key.equals("checkboxPref")) {        //Reset other items        CheckBoxPreference p = (CheckBoxPreference)findPreference("checkboxPref2");        p.setChecked(false);    }    else if (key.equals("checkboxPref2")) {        //Reset other items        CheckBoxPreference p = (CheckBoxPreference)findPreference("checkboxPref");        p.setChecked(false);    }    //Force the current focused checkbox to always stay checked when pressed    //i.e confirms value when newValue is checked (true) and discards newValue    //when newValue is unchecked (false)    return (Boolean)newValue;}

The only downside is that the checkboxes will not look like radio buttons...

I think this is pretty simple if that is what you want:

1. Add the checkboxes at the preferenses xml like that:

    <CheckBoxPreference    android:key="prefkey_cbp_1"    android:summary="@string/prefkey_cbp_1"    android:title="@string/prefkey_cbp_1"    android:defaultValue="false" /><CheckBoxPreference    android:key="prefkey_cbp_2"    android:summary="@string/prefkey_cbp_2"    android:title="@string/prefkey_cbp_2"    android:defaultValue="false" />//etc...

2. At the preferences class onCreate build an CheckBoxPreference array or list or whatever you like, like that:

   ArrayList<CheckBoxPreference> cbp_list = new ArrayList<CheckBoxPreference>();cbp_list.add((CheckBoxPreference) getPreferenceManager()        .findPreference(PreferencesProtocol.prefkey_cbp_1));cbp_list.add((CheckBoxPreference) getPreferenceManager()        .findPreference(PreferencesProtocol.prefkey_cbp_2));

3. Make your preferences class implement OnPreferenceClickListener and set the OnPreferenceClickListener to the checkboxes like that :

   for (CheckBoxPreference cbp : cbp_list) {cbp.setOnPreferenceClickListener(this);}

4. Then just override the onPreferenceClick and handle any click. For example if you want checkboxes to perform like radio buttons (in the same radiogroup), meaning, only one checkbox at the time to be check, do something like that:

   @Overridepublic boolean onPreferenceClick(Preference arg0) {for (CheckBoxPreference cbp : cbp_list) {    if (!cbp.getKey().equals(arg0.getKey()) && cbp.isChecked()) {        cbp.setChecked(false);    }}return false;}