Call a method when click on preference header Android -

i call method clear cache when click on specific header in preference screen in android.

the problem onsharedpreferencechanged never called :

here piece of code of preferences.xml :

<header android:icon="@drawable/ic_action_cancel"         android:title="vider le cache d'articles"         android:key="clearcache"         android:summary="clear datas."> </header> 

and, here code of settingactivity :

package com.rss.preferences;  import java.io.file; import java.util.list;  import com.rss.r;  import android.content.context; import android.content.sharedpreferences; import android.content.sharedpreferences.onsharedpreferencechangelistener; import android.os.bundle; import android.preference.preferenceactivity; import android.preference.preferencemanager; import android.util.log; import android.view.gravity; import android.widget.textview;   public class settingsfragment extends preferenceactivity  {      sharedpreferences settings;     public static final string key_clear_cache = "clearcache";      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          // add button header list.         if (hasheaders()) {             textview txt = new textview(this);             txt.settext("version 1.0 beta");             txt.setgravity(gravity.center);             setlistfooter(txt);         }          settings = getsharedpreferences("clearcache", 0);         settings.registeronsharedpreferencechangelistener(new sharedpreferences.onsharedpreferencechangelistener() {           @override           public void onsharedpreferencechanged (sharedpreferences sharedpreferences, string key) {             log.d("info", "popopo");           }         });      }      public void onbuildheaders(list<header> target) {         loadheadersfromresource(r.xml.preferences, target);     }  //  public void onsharedpreferencechanged(sharedpreferences sharedpreferences, string key) { //      if (key.equals(key_clear_cache)) { //            clearapplicationdata(); //        } //    }       public void clearapplicationdata() {         file cache = getcachedir();         file appdir = new file(cache.getparent());         if (appdir.exists()) {             string[] children = appdir.list();             (string s : children) {                 if (!s.equals("lib")) {                     deletedir(new file(appdir, s));                     log.i("tag", "**************** file /data/data/app_package/" + s + " deleted *******************");                 }             }         }     }       public static boolean deletedir(file dir) {         if (dir != null && dir.isdirectory()) {             string[] children = dir.list();             (int = 0; < children.length; i++) {                 boolean success = deletedir(new file(dir, children[i]));                 if (!success) {                     return false;                 }             }         }          return dir.delete();     }  } 

you don't need onsharedpreferencechangelistener in case. need override onheaderclick method in preferenceactivity.

@override public void onheaderclick(header header, int position) {     super.onheaderclick(header, position);     if (header.id == r.id.clear_cache) {         clearapplicationdata();     } } 

of course have add id header in xml.

<header android:id="@+id/clear_cache"         android:icon="@drawable/ic_action_cancel"         android:title="vider le cache d'articles"         android:key="clearcache"         android:summary="clear datas."> </header>