FirstActivity.java

package com.patryklenza.androidespressoidlingresource;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;

import java.util.concurrent.TimeUnit;

import rx.Observable;
import rx.Subscriber;
import rx.Subscription;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;

public class FirstActivity extends Activity {

    private Button button1OnFirstActivity;
    private Button button2OnFirstActivity;
    private Subscription subscription;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);

        button1OnFirstActivity = (Button) findViewById(R.id.button1OnFirstActivity);
        button2OnFirstActivity = (Button) findViewById(R.id.button2OnFirstActivity);

        button1OnFirstActivity.setOnClickListener(v -> {
            button1OnFirstActivity.setEnabled(false);
            subscription = Observable.empty()
                                               .subscribeOn(Schedulers.newThread())
                                               .observeOn(AndroidSchedulers.mainThread())
                                               .delay(10, TimeUnit.SECONDS)
                                               .subscribe(launchSecondActivity());
        });

        button2OnFirstActivity.setOnClickListener(v -> {
            Intent thirdActivity = new Intent(FirstActivity.this, ThirdActivity.class);
            startActivity(thirdActivity);
        });
    }

    @Override
    protected void onDestroy() {
        if(subscription != null) {
            subscription.unsubscribe();
        }
        super.onDestroy();
    }

    private Subscriber<Object> launchSecondActivity() {
        return new Subscriber<Object>() {
            @Override
            public void onCompleted() {
                if(!isUnsubscribed()) {
                    Intent secondActivity = new Intent(FirstActivity.this, SecondActivity.class);
                    startActivity(secondActivity);
                }
            }

            @Override
            public void onError(Throwable e) {
            }

            @Override
            public void onNext(Object o) {
            }
        };
    }
}