How to fill ListPreference dynamically when onPreferenceClick is triggered?

user_183524 0
Viewed 32608

I have a preference activity that has a language as ListPreference which displays the available language list. I can fill the list when onCreate is called, but I want to fill the list when the user clicks on it.

this is the java code : 

public class SettingsActivity extends PreferenceActivity implements OnPreferenceClickListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
            addPreferencesFromResource(R.xml.settings);
        } catch (Exception e) {

        }

    }

    @Override
    public boolean onPreferenceClick(Preference preference) {

        if((preference instanceof ListPreference) && (preference.getKey().equals("language"))){
            ListPreference lp = (ListPreference)preference;
            CharSequence[] entries = { "English", "French" };
            CharSequence[] entryValues = {"1" , "2"};
            lp.setEntries(entries);
            lp.setDefaultValue("1");
            lp.setEntryValues(entryValues);
            return true;
        }
        return false;

    }
}

and this is the settings.xml (preference) :

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory android:title="General Settings">
        <CheckBoxPreference android:key="enabled"  android:title="Application Status" android:summary="Enable or disable the application" />
         <ListPreference 
         android:key="language" 
         android:title="Language"
         android:dialogTitle="Application language" 
         android:summary="Select the Application language"
         />
    </PreferenceCategory>
</PreferenceScreen>

I searched but found no result! An exception occurs every time I click on that list.

android-preferences android
4 Answers

This is what I had to do to make mine work

    public static class MyPreferenceFragment extends PreferenceFragment
{
    @Override
    public void onCreate(final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.pref_general);
        PreferenceCategory targetCategory = (PreferenceCategory) findPreference("CUSTOM_FRAG");

        //final Preference pref;
        //pref = findPreference("example_list1");
        final ListPreference lp = setListPreferenceDataSocieties((ListPreference) findPreference("custom1"), getActivity());
        final ListPreference lp2 = setListPreferenceDataRoutes((ListPreference) findPreference("custom2"), getActivity());
        final ListPreference lp3 = setListPreferenceDataCoolers((ListPreference) findPreference("custom3"), getActivity());



        setHasOptionsMenu(true);
        targetCategory.addPreference(lp);
        targetCategory.addPreference(lp2);
        targetCategory.addPreference(lp3);

        bindPreferenceSummaryToValue(targetCategory);
        bindPreferenceSummaryToValue(lp);
        bindPreferenceSummaryToValue(lp2);
        bindPreferenceSummaryToValue(lp3);
    }

    protected ListPreference setListPreferenceDataSocieties(ListPreference lp, Activity mActivity) {
        CharSequence[] entries = { "One", "Two", "Three" };
        CharSequence[] entryValues = { "1", "2", "3" };
        if(lp == null)
            lp = new ListPreference(mActivity);
        lp.setEntries(entries);
        lp.setDefaultValue("1");
        lp.setEntryValues(entryValues);
        lp.setTitle("Origin Society");
        lp.setSummary(lp.getEntry());
        lp.setDialogTitle("Registered Societies");
        lp.setKey("society_list");
        return lp;
    }


    protected ListPreference setListPreferenceDataRoutes(ListPreference lp, Activity mActivity) {
        CharSequence[] entries = { "One", "Two", "Three" };
        CharSequence[] entryValues = { "1", "2", "3" };
        if(lp == null)
            lp = new ListPreference(mActivity);
        lp.setEntries(entries);
        lp.setDefaultValue("1");
        lp.setEntryValues(entryValues);
        lp.setTitle("Designated Route");
        lp.setSummary(lp.getEntry());
        lp.setDialogTitle("Available Routes");
        lp.setKey("route_list");
        return lp;
    }
    protected ListPreference setListPreferenceDataCoolers(ListPreference lp, Activity mActivity) {
        CharSequence[] entries = { "One", "Two", "Three" };
        CharSequence[] entryValues = { "1", "2", "3" };
        if(lp == null)
            lp = new ListPreference(mActivity);
        lp.setEntries(entries);
        lp.setDefaultValue("1");
        lp.setEntryValues(entryValues);
        lp.setTitle("Destination Cooler");
        lp.setSummary(lp.getEntry());
        lp.setDialogTitle("Available Coolers");
        lp.setKey("cooler_list");
        return lp;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == android.R.id.home) {
            startActivity(new Intent(getActivity(), SettingsActivity.class));
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}


boolean first_run = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    MyPreferenceFragment frag =  new MyPreferenceFragment();
    getFragmentManager().beginTransaction().replace(android.R.id.content, frag).commit();

}
user_30568680
Related