How to give input field cursor focus in sapui5 mobile application?

I have tried many ways but Its not working. I tried this methods.

1) sap.ui.getCore().byId("GmapLocinput").focus();

2) var inputfield = new sap.m.input("",{placeholder:"Name"});

     inputfield.focus();

This two method i tried but i'm not getting. please assist me.