Android Resources for Beginner

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Getting Started

Welcome to Training for Android developers. Here you'll find sets of lessons within classes that describe how to accomplish a specific task with code samples you can re-use in your app. Classes are organized into several groups you can see at the top-level of the left navigation.

This first group, Getting Started, teaches you the bare essentials for Android app development. If you're a new Android app developer, you should complete each of these classes in order.

If you think you might prefer to learn the basics through interactive video training, check out this trailer for a course in the fundamentals of Android development. Read more...

 

Building Your First App

This class teaches you how to build your first Android app. You’ll learn how to create an Android project and run a debuggable version of the app. You'll also learn some fundamentals of Android app design, including how to build a simple user interface and handle user input. Read more...

 

Adding the Action Bar

 The action bar is one of the most important design elements you can implement for your app's activities. It provides several user interface features that make your app immediately familiar to users by offering consistency between other Android apps. Key functions include:

• A dedicated space for giving your app an identity and indicating the user's location in the app.
• Access to important actions in a predictable way (such as Search).
• Support for navigation and view switching (with tabs or drop-down lists). Read more...

 

Supporting Different Devices

Android devices come in many shapes and sizes all around the world. With a wide range of device types, you have an opportunity to reach a huge audience with your app. In order to be as successful as possible on Android, your app needs to adapt to various device configurations. Some of the important variations that you should consider include different languages, screen sizes, and versions of the Android platform.

This class teaches you how to use basic platform features that leverage alternative resources and other features so your app can provide an optimized user experience on a variety of Android-compatible devices, using a single application package (APK). Read more...

 

Managing the Activity Lifecycle

As a user navigates through, out of, and back to your app, the Activity instances in your app transition between different states in their lifecycle. For instance, when your activity starts for the first time, it comes to the foreground of the system and receives user focus. During this process, the Android system calls a series of lifecycle methods on the activity in which you set up the user interface and other components. If the user performs an action that starts another activity or switches to another app, the system calls another set of lifecycle methods on your activity as it moves into the background (where the activity is no longer visible, but the instance and its state remains intact).
Within the lifecycle callback methods, you can declare how your activity behaves when the user leaves and re-enters the activity. For example, if you're building a streaming video player, you might pause the video and terminate the network connection when the user switches to another app. When the user returns, you can reconnect to the network and allow the user to resume the video from the same spot.
This class explains important lifecycle callback methods that each Activity instance receives and how you can use them so your activity does what the user expects and does not consume system resources when your activity doesn't need them. Read more...

Building a Dynamic UI with Fragments

To create a dynamic and multi-pane user interface on Android, you need to encapsulate UI components and activity behaviors into modules that you can swap into and out of your activities. You can create these modules with the Fragment class, which behaves somewhat like a nested activity that can define its own layout and manage its own lifecycle.
When a fragment specifies its own layout, it can be configured in different combinations with other fragments inside an activity to modify your layout configuration for different screen sizes (a small screen might show one fragment at a time, but a large screen can show two or more).
This class shows you how to create a dynamic user experience with fragments and optimize your app's user experience for devices with different screen sizes, all while continuing to support devices running versions as old as Android 1.6. Read more...

Saving Data

Most Android apps need to save data, even if only to save information about the app state during onPause() so the user's progress is not lost. Most non-trivial apps also need to save user settings, and some apps must manage large amounts of information in files and databases. This class introduces you to the principal data storage options in Android, including:

• Saving key-value pairs of simple data types in a shared preferences file
• Saving arbitrary files in Android's file system
• Using databases managed by SQLite  Read more...

 

Interacting with Other Apps

An Android app typically has several activities. Each activity displays a user interface that allows the user to perform a specific task (such as view a map or take a photo). To take the user from one activity to another, your app must use an Intent to define your app's "intent" to do something. When you pass an Intent to the system with a method such as startActivity(), the system uses the Intent to identify and start the appropriate app component. Using intents even allows your app to start an activity that is contained in a separate app.
An Intent can be explicit in order to start a specific component (a specific Activity instance) or implicit in order to start any component that can handle the intended action (such as "capture a photo").
This class shows you how to use an Intent to perform some basic interactions with other apps, such as start another app, receive a result from that app, and make your app able to respond to intents from other apps. Read more...

Google Android:

• Google Projects for Android
• Android Source
• Android Training
• Android lollipop 5.0