Answer by bpr10 for How do I fix 'android.os.NetworkOnMainThreadException'?

We can also use RxJava to move network operations to a background thread. And it's fairly simple as well.

webService.doSomething(someData)
          .subscribeOn(Schedulers.newThread())-- This for background thread
          .observeOn(AndroidSchedulers.mainThread()) -- for callback on UI              
          .subscribe(result -> resultText.setText("It worked!"),
              e -> handleError(e));

You can do a lot more stuff with RxJava.Here are some links for RxJava. Feel free to dig in.

RxJava Async task in Android

http://blog.stablekernel.com/replace-asynctask-asynctaskloader-rx-observable-rxjava-android-patterns/