broadcastreceiver - blocking specific numbers (call and sms) in android -

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i'm creating app in user can choose number block think right algorithm : when phone rings, function check number in list or not (check in database) , if there is, reject call

i found code in internet doesn't work,should call onreceive function in activity? should wrote on main activity?

here code:

public class incomingcallreceiver extends broadcastreceiver {     private itelephony telephonyservice;     private string blacklistednumber = "+458664455";      @override     public void onreceive(context context, intent intent) {         telephonymanager tm = (telephonymanager) context.getsystemservice(context.telephony_service);        try {          class c = class.forname(tm.getclass().getname());          method m = c.getdeclaredmethod("getitelephony");          m.setaccessible(true);          itelephony telephonyservice = (itelephony) m.invoke(tm);          bundle bundle = intent.getextras();          string phonenumber = bundle.getstring("incoming_number");          log.e("incoming", phonenumber);          if ((phonenumber != null) && phonenumber.equals(blacklistednumber)) {              telephonyservice.silenceringer();             telephonyservice.endcall();             log.e("hang up", phonenumber);          }         } catch (exception e) {          e.printstacktrace();        } }

interface:

 public interface itelephony {          boolean endcall();          void answerringingcall();          void silenceringer();    }

i added below code manifest 

<receiver android:name="incomingcallreceiver" >         </receiver>  <uses-permission android:name="android.permission.read_phone_state"/>     <uses-permission android:name="android.permission.call_phone"/>    <uses-permissionandroid:name="android.permission.process_incoming_calls"/>

did miss anything?


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