By Jason Ostrander
Writer Jason Ostrander walks builders in the course of the varied offerings to be had on their technique to making a well-designed software for Android. whereas development an easy program, Jason works throughout the fundamentals of Android UI improvement together with structure, occasion dealing with, menus and notifications. the writer then exhibits the right kind method to load and demonstrate pictures, create complex dialogs and growth signs, upload animation, and the way to construct customized UI components. Jason discusses the correct method of including interplay via gestures and the complex graphical innovations to be had utilizing Canvas, Renderscript and OpenGL. ultimately, he discusses pill improvement, the original modifications among mobilephone and capsule UI, and the recent APIs on hand to pill builders.
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Extra resources for Android UI Fundamentals: Develop & Design
Here, we舗ll go over the most important attributes and behaviors, covering a few confusing aspects along the way. Note Android uses special dimension units called density-independent pixels, or dp. This is one way that Android handles varying screen sizes and densities. You舗ll learn more about this in Chapter 3. For now, know that you should almost always use dp units when specifying the size of your UI elements. Height and width Every view in Android is required to have a height and width. These are specified using the layout_height and layout_width attributes.
You舗ll learn about more attributes throughout this book, but there are too many to cover them all. Arranging Views The Android view hierarchy starts with a layout container. These containers hold the child views and arrange them relative to each other. There are several container types with different characteristics, optimizing them for different situations. FrameLayout The simplest layout container is the FrameLayout. This container does not arrange child views at all. It simply presents each view, one on top of the other.
Android uses a standard Java application layout. 1 summarizes the project structure. 1 Android Project Folder Structure Android Manifest The Android manifest contains all the information about your app舗s structure and functionality. It includes all the activities your app uses, the services it provides, any database content it makes available via a content provider, and any intents it processes. LAUNCHER" /> ŠŠŠŠŠŠŠŠŠŠŠŠ ŠŠŠŠŠŠŠŠ ŠŠŠŠ The manifest is where you declare the physical hardware features your app needs to run.