By Jason Ostrander
Writer Jason Ostrander walks builders during the various offerings on hand on their technique to making a well-designed software for Android. whereas construction an easy program, Jason works in the course of the fundamentals of Android UI improvement together with structure, occasion dealing with, menus and notifications. the writer then indicates the correct technique to load and show photos, create complex dialogs and growth signs, upload animation, and the way to construct customized UI components. Jason discusses the correct means of including interplay via gestures and the complicated graphical concepts to be had utilizing Canvas, Renderscript and OpenGL. eventually, he discusses capsule improvement, the original modifications among mobile and capsule UI, and the recent APIs on hand to pill builders.
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Now try changing the size of the TextView. 5. Make it fill the width of the window. 6. Add a Button below your newly created TextView, and expand it to fill the width of the window. 15. As you can see, the graphical layout editor makes it possible to quickly create complex layouts with very little effort. Tools 25 Android Virtual Devices Android is designed to run on a wide range of hardware. It’s important to test your code extensively before release to ensure that your app is compatible with most Android devices.
Use the options menu for displaying infrequently used options for your application. 0 or greater, this button is not available, and options are instead presented on the action bar. 0 devices and previous versions of Android in a later chapter. Tip: It is often difficult for users to discover features hidden behind the Menu button. Carefully consider your application’s needs, and provide space in your layout for all common operations that the user will need to take. 20 Chapter 1 Getting Started Finally, the Search button exists to provide a quick interface for launching a search on Android.
For example, there is no support for emulating OpenGL graphics, Near Field Communication (NFC), or even Wi-Fi. To ensure maximum compatibility, you should always test your final application on a real hardware device. 26 Chapter 1 Getting Started Hierarchy Viewer When developing any application, it is important that the app feel very responsive. Often, an unresponsive app is due to slowdowns in drawing the UI. To assist in debugging these situations, Android includes a tool called the Hierarchy Viewer.