The fragment lifecycle is embedded within the activity lifecycle but has some details and extra steps in it. Within this, you can handle when the activity is destroyed, paused, resumed, or created. When an application is opened and shows its first activity, it follow a specific lifecycle. The fragment's lifecycle is directly affected by the host activity's lifecycle - in other words, a fragment cannot be instantiated alone! And it must always be embedded in an activity. You can think of a fragment as a modular section of an activity, which has its own lifecycle, receives its own input events, and to which you can add or remove while the activity is running (sort of like a 'sub activity' that you can reuse in different activities).

You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities.

Fragment represents a behavior or a portion of user interface in an Activity.

(UI components and how to build a layout will be discussed in another article).

In other words, it is responsible for creating a window to hold your UI components. Activity is the part where the user will interacts with your application.In this first article we will talk about activities, fragments, show example codes, and look at the lifecycle of the Android application. Android's user interface is mainly based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input.'Īs the most of you know, the Android system runs its features using applications. 'Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Let's start with a little history: What is Android? In this collection of articles about Android, I will guide you through the basic topics that you'll need to get started in this mobile world - even if you're completely new to the Android operating system.

Android studio fragment