android - My call application stops running, I don't have any code errors -


my application stops running , don't understand why; think code correct. it's simple call application

button b;  context= mcontext; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     b = (button) findviewbyid(r.id.call);     b.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {              if (activitycompat.checkselfpermission(mcontext, manifest.permission.call_phone) != packagemanager.permission_granted) {                 intent call = new intent(intent.action_dial, uri.parse("tel:0102030405"));                 startactivity(call);                   return;             }          }          }      ); }

initialize context mcontext = getapplicationcontext(); inside oncreate()


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