android - Consume preference click event -

i facing problem while trying consume click event of preference. there's preference, , on clicking it, open sub screen different preference categories. want achieve if condition false, toast should popup, , sub screen shouldn't open. in case it's true, should work , open sub screen. this, tried following piece of code :

    mpref = (preference) findpreference("abc");     mpref.setonpreferenceclicklistener(this);  @override public boolean onpreferenceclick(preference preference) {     // todo auto-generated method stub      if (!condition) {         toast.maketext(getactivity(), "error", toast.length_short).show();         return true;    // consume click event.     }     return false; } 

the relevant part of xml follows:

<?xml version="1.0" encoding="utf-8"?> 

<preferencescreen     android:key="abc"     android:summary="@string/string_turn_on"     android:textcolor="@android:color/white"     android:title="@string/string_turn_on">       <preferencecategory           android:key="asa"          android:title="a" >         <com.example.gaurav.custompref             android:defaultvalue="0"             android:key="st"             android:dependency="e"             android:showdefault="true"             android:summary="summary"             android:title="t" />         <com.example.gaurav.custompref             android:defaultvalue="0"             android:key="st"             android:dependency="e"             android:showdefault="true"             android:summary="so"             android:title="so" />     </preferencecategory>     <preferencecategory          android:title="other" >         <checkboxpreference             android:defaultvalue="false"             android:key="e"             android:title="eb" />     </preferencecategory>   </preferencescreen>  

i have changed strings etc, don't think cause error, won't matter. it's preference key "abc" launches sub screen want prevent launching. regarding appreciated.

try adding line in oncreate method

addpreferencesfromresource(r.xml.preferences); 

edit:

@override public boolean onpreferenceclick(preference preference) {    if (condition) {       return true;    // consume click event.    }    toast.maketext(getactivity(), "error", toast.length_short).show();    return false; }