android - How to add ListPreference in this Activity? -

i newbie @ android development , trying implement settings activity can take user preferences. settings activity includes code handle edit preference changes.the module implemented android 3.0 , above hence settings fragment used.

public class settingsactivity extends preferenceactivity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      getfragmentmanager().begintransaction().replace(android.r.id.content, new settingsfragment()).commit(); }  public static class settingsfragment extends preferencefragment implements sharedpreferences.onsharedpreferencechangelistener{     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          // load preferences xml resource         addpreferencesfromresource(r.xml.pref_general);     }      @override     public void onresume(){         super.onresume();         getpreferencescreen().getsharedpreferences().registeronsharedpreferencechangelistener(this);     }      @override     public void onpause(){         super.onpause();         getpreferencescreen().getsharedpreferences().unregisteronsharedpreferencechangelistener(this);     }      @override     public void onsharedpreferencechanged(sharedpreferences sharedpreferences,string key){         if(key.equals("location")){             preference loc_preference=findpreference("location");             loc_preference.setsummary(sharedpreferences.getstring(key,""));         }     } } 

}

this pref_gen.xml file

<preferencescreen xmlns:android="http://schemas.android.com/apk/res/android">  <edittextpreference     android:key="@string/pref_loc_key"     android:dialogmessage="@string/location_dialog_message"     android:dialogtitle="@string/location_dialog"     android:title="@string/pref_loc_label"     android:defaultvalue="@string/pref_default_loc"     android:selectallonfocus="true"     android:singleline="true" />  <listpreference     android:key="@string/pref_unit_key"     android:dialogtitle="@string/unit_dialog_message"     android:title="@string/pref_unit_label"     android:defaultvalue="@string/pref_default_unit"     android:entries="@array/pref_unit_options"     android:entryvalues="@array/pref_unit_values" /> 

this arrays.xml file

<string-array name="pref_unit_options">     <item>metric</item>     <item>imperial</item> </string-array> <string-array name="pref_unit_values">     <item>1</item>     <item>0</item> </string-array> 

can me add list preference module in settings fragment method along listener? have gone through other posts somehow cant modify accordingly.

you can use getpreference reference listpreference in java , register listener on it.

listpreference unit_preference = mcontext.getpreference(<key>);  unit_preference .setonpreferencechangelistener(new onpreferencechangelistener() {      public boolean onpreferencechanged(preference preference, object newvalue) {           //do newvalue here     } }); 

note: mcontext class variable of type context. must set before calling begintransaction:

mcontext = this;