ANDROID.COM

android.com

Understand Tasks and Back Stack | Android Developers — A task is a cohesive unit that can move to the "background" when users begin a new task or go to the Home screen, via the Home button. While in the background, all the activities in the task are stopped, but the back stack for the task remains intact—the task has simply lost focus while another task takes place, as shown in figure 2.

MKYONG.COM

mkyong.com

Android button example – Mkyongcom — In Android, just use “android.widget.Button” class to display a normal button. In this tutorial, we show you how to display a normal button, add a click listener, when user click on the button, open an URL in your Android’s internet browser.

AMAZON.COM

amazon.com

Android - Login with Amazon Developer Center — In this guide we will show you how to add Login with Amazon to your Android app, using the Login with Amazon SDK for Android. After completing this guide you should have a working Login with Amazon button in your app that allows users to login with their Amazon credentials.

ANDROID.COM

android.com

Back up user data with Auto Backup | Android Developers — Auto Backup for Apps automatically backs up a user's data from apps that target and run on Android 6.0 (API level 23) or later. Android preserves app data by uploading it to the user's Google Drive—where it's protected by the user's Google Account credentials.