android - How to send the incoming phone call number to another activity using intent -


i want display phone number textview masking last 4 digits if possible, can't run properly, application stops... here sample/reference code of want do. if using toast displays number when using intent code not work: runtime error.

sender(2nd activity)

import android.content.broadcastreceiver; import android.content.context; import android.content.intent; import android.os.bundle; import android.telephony.telephonymanager; import android.widget.toast;   public class mycallreceiver extends broadcastreceiver {      @override     public void onreceive(context context, intent intent) {         // todo auto-generated method stub         if (intent.getstringextra(telephonymanager.extra_state).equals(telephonymanager.extra_state_ringing)) {                string incomingnumber = intent.getstringextra(telephonymanager.extra_incoming_number);              intent = new intent(context,mainactivity.class);             a.putextra("key", incomingnumber);             context.startactivity(a);      }

main activity

import android.os.bundle; import android.app.activity; import android.widget.textview;  public class mainactivity extends activity {      textview tv1,tv2;     string gotbread;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         initialize();         tv1.setselected(true);         bundle gotbasket = getintent().getextras();         gotbread = gotbasket.getstring("key");         tv2.settext(gotbread);       }      public void initialize() {         // todo auto-generated method stub         tv1 = (textview) this.findviewbyid(r.id.tv1);         tv2 = (textview) this.findviewbyid(r.id.tv2);     }  }

here logcat hope helps...

08-18 02:50:10.121: d/androidruntime(1306): shutting down vm 08-18 02:50:10.121: w/dalvikvm(1306): threadid=1: thread exiting uncaught exception (group=0xb2a3fba8) 08-18 02:50:10.131: e/androidruntime(1306): fatal exception: main 08-18 02:50:10.131: e/androidruntime(1306): process: com.example.detectincomingcall, pid: 1306 08-18 02:50:10.131: e/androidruntime(1306): java.lang.runtimeexception: unable start activity componentinfo{com.example.detectincomingcall/com.example.detectincomingcall.mainactivity}: java.lang.nullpointerexception 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activitythread.performlaunchactivity(activitythread.java:2195) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2245) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activitythread.access$800(activitythread.java:135) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activitythread$h.handlemessage(activitythread.java:1196) 08-18 02:50:10.131: e/androidruntime(1306): @ android.os.handler.dispatchmessage(handler.java:102) 08-18 02:50:10.131: e/androidruntime(1306): @ android.os.looper.loop(looper.java:136) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activitythread.main(activitythread.java:5017) 08-18 02:50:10.131: e/androidruntime(1306): @ java.lang.reflect.method.invokenative(native method) 08-18 02:50:10.131: e/androidruntime(1306): @ java.lang.reflect.method.invoke(method.java:515) 08-18 02:50:10.131: e/androidruntime(1306): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:779) 08-18 02:50:10.131: e/androidruntime(1306): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:595) 08-18 02:50:10.131: e/androidruntime(1306): @ dalvik.system.nativestart.main(native method) 08-18 02:50:10.131: e/androidruntime(1306): caused by: java.lang.nullpointerexception 08-18 02:50:10.131: e/androidruntime(1306): @ com.example.detectincomingcall.mainactivity.oncreate(mainactivity.java:21) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activity.performcreate(activity.java:5231) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1087) 08-18 02:50:10.131: e/androidruntime(1306): @ android.app.activitythread.performlaunchactivity(activitythread.java:2159) 08-18 02:50:10.131: e/androidruntime(1306): ... 11 more

turn evaluation around , use yoda notation. ensure not npe trying execute null.equals(). sure check argument not null. java has strict evaluation order left right can use short-circuit evaluation.

   if (null != intent && telephonymanager.extra_state_ringing.equals(intent.getstringextra(telephonymanager.extra_state)))

and in oncreate() might consider being bit paranoid

    intent intent = getintent();     if (null != intent) {          bundle gotbasket = intent.getextras();          if (null != gotbasket) {              gotbread = gotbasket.getstring("key");              tv2.settext(gotbread);         }     }

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