Systems Analysis Design

Android Best Practices by Godfrey Nolan

By Godfrey Nolan

Android most sensible Practices through Godfrey Nolan exhibits you the way to make your Android apps stand proud of the gang with nice stories. Why accept simply making any Android app? construct a super Android app as an alternative that shall we your clients compliment it for ease of use, higher functionality, and extra.

Using a sequence of instance apps which progressively evolve all through this book, Android top Practices brings jointly present Android most sensible practices from person interface (UI)/user event (UX) layout, test-driven improvement (TDD), and layout styles (e.g., MVC) that can assist you take your app to the subsequent level.

In this publication you’ll learn the way to:

• Use Android layout styles for constant UI event on many devices

• Use agile strategies equivalent to test-driven improvement, behavior-driven improvement, and non-stop integration

• enhance the rate and performance of your app

• arrange an Android app utilizing layout styles reminiscent of MVC/MVP

• Create and devour leisure and cleaning soap net services

Designing and constructing an app that runs good on many if now not the entire prime Android smartphones and capsules at the present time may be probably the most daunting demanding situations for Android builders. good, this ebook takes a lot of the secret out of that for you.

After examining and utilizing Android most sensible Practices, you will develop into a higher Android app clothier and developer, which in flip could make your apps greater positioned and extra winning out there place.

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Additional resources for Android Best Practices

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Figure 3-7 shows Biggest Objects by Retained Size. 60 CHAPTER 3: Performance Figure 3-7. Memory Analyzer Tool overview Memory Allocation The next level of detail about allocations is shown in the Allocation Tracker view (Figure 3-8). To display it, click Start Tracking, perform an action in the application, and then click Get Allocations. The list presented is in allocation order, with the most recent memory allocation displayed first. Highlighting it will give you a stack trace showing how that allocation was created.

Avoid internal getters/setters. Virtual method calls are expensive, more so than instance field lookups. It’s reasonable to follow common object-oriented programming practices and have getters and setters in the public interface, but within a class you should always access fields directly. dex in the APK. Use static/final where appropriate. Because of the way the code is compiled into Davlik bytecode, any code that refers to intVal will use the integer value 42 directly if you use a static final, and accesses to strVal will use a relatively inexpensive “string constant” instruction instead of a field lookup.

Listing 2-15. TaskListManager { /*The ViewModel acts as a delegate between the ToDoActivity (View) *and the ToDoProvider (Model). * The ViewModel receives references from the View and uses them * to update the UI. */ private TodoModel db_model; private List tasks; private Context main_activity; private ListView taskView; private EditText newTask; public TodoViewModel(Context app_context) { tasks = new ArrayList(); main_activity = app_context; db_model = new TodoModel(app_context); } //Overrides to handle View specifics and keep Model straightforward.

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