Preview - Programming Mobile Services for Android Handheld Systems

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来自 University of Maryland, College Park 的课程

Programming Mobile Applications for Android Handheld Systems: Part 1

504 个评分

University of Maryland, College Park

Programming Mobile Applications for Android Handheld Systems: Part 1

504 个评分

This course introduces you to the design and implementation of Android applications for mobile devices. You will develop an app from scratch, assuming a basic knowledge of Java, and learn how to set up Android Studio, work with various Activities and create simple user interfaces to make your apps run smoothly.

从本节课中

Application Fundamentals and the Activity Class

Application Fundamentals - Part 115:27

Application Fundamentals - Part 211:17

The Activity Class - Part 114:07

The Activity Class - Part 214:35

Introduction to Amazon Guest Lecture - AppStores and Free Ebook2:25

Introduction to Amazon Guest Lecture - App Monetization0:52

Preview - Programming Mobile Services for Android Handheld Systems2:18

与讲师见面

Dr. Adam Porter
Professor
Computer Science

[MUSIC]

Welcome to the module on Android Concurrency Frameworks.

Although the standard Java threading, synchronizer, and

coordination features, covered in the previous module,

provide the foundation for Android's concurrency mechanisms.

They can be tedious and error-prone to use, and

don't shield application developers from Android's design constraints,

such as its non-thread safe GUI libraries, and

its limits on the amount of time the one the only user interface thread can block.

Therefore, to ensure the concurrency can be used correctly, efficiently and

scalably in applications and middleware, as well as to elevate the complexity of

its design constraints, Android provides several concurrency frameworks that allow

background threads to run in parallel on multiple cause.

And communicate in various ways with its user interface thread.

This module focuses on two Android concurrency frameworks.

First we cover its handlers, runables and messages.

Or hammer framework, which provides a loosely connected set of classes,

that allow long duration operations to run in one ore more background threads, and

then publish the results of these operations to the user interface thread.

Second, we cover Androids async task framework,

which provides a more tightly connected set of classes,

that executes long duration operations in one or more background threads.

And publish the results to the user interface thread without manipulating

threads, handlers, messages or runables explicitly.

We'll explore the structure and functionality of these frameworks, and

show how to apply them to develop concurrent programs.

Such as a threaded downloads application that implements three

concurrency models using the Android Hammer, and AsyncTask frameworks.

We also demonstrate how Android concurrency frameworks are applied to

its middleware and packaged applications.

As well has how its frameworks are enhanced, by the application of

Gang of Four patterns, such as template method, strategy, and factory method.

And POSA patterns, such as active object, command processor, half sync half async,

and threat specific storch.

[MUSIC]

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