Android InApp, java.lang.NullPointerException purchasing item from JsInterface

android,in-app-purchase,in-app-billing,in-app,android-jsinterface

Change this: MainActivity cls2= new MainActivity(); cls2.purchaseItem(sku); To : mContext.startActivity(new Intent(mContext, MainActivity.class).putExtra("item", sku)); And then, in your OnCreate in MainActivity: String item = getIntent().getStringExtra("item"); purchaseItem(item); ...