android - BroadcastReceiver class must work only when the toggle button is checked -

hey guys want broadcastreceiver must work when togglebutton checked.... code have used is...

in manifest.xml file...

<receiver              android:name="start">          <intent-filter>             <action android:name="android.intent.action.phone_state" />         </intent-filter>             </receiver>  

in activity class...

togglebutton tgl;     string prefs="app_preference";     sharedpreferences sharedprefs;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         tgl=(togglebutton)findviewbyid(r.id.togglebutton1);         tgl.setoncheckedchangelistener(this);         sharedprefs = getsharedpreferences(prefs,mode_private);         tgl.setchecked(sharedprefs.getboolean("is_receiver_enabled", false));  public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) {         // todo auto-generated method stub          if(tgl.ischecked()){              sharedpreferences.editor editor = sharedprefs.edit();              editor.putboolean("is_receiver_enabled", true);                 editor.commit();          }else{             sharedpreferences.editor editor = sharedprefs.edit();             editor.putboolean("is_receiver_enabled", false);             editor.commit();         } 

in broadcastreceiver class...

public void onreceive(context context, intent intent) {         // todo auto-generated method stub         boolean isenabled = context.getsharedpreferences("app_preference",                 context.mode_private).getboolean("is_receiver_enabled",                 false);         if (isenabled) {              toast.maketext(context,"intent detected", toast.length_long).show();         }       } 

this possible if register receiver @ activity level(not manifest) using

when toggle button disable

registerreceiver(broadcastreceiver, intentfilter) 

and when toggle button disable can unregister using..

unregisterreceiver(broadcastreceiver receiver)