By Kyle Mew, Rick Boyer
The Android OS has the most important deploy base of any working method on the earth; there hasn't ever been a greater time to profit Android improvement to write down your individual purposes, or to make your individual contributions to the open resource community!
This “cookbook” will make it effortless so that you can bounce to an issue of curiosity and get what you want to enforce the characteristic on your personal program. while you're new to Android and examine most sensible by way of “doing,” then this publication will offer many subject matters of interest.
Starting with the fundamentals of Android improvement, we circulate directly to extra complex techniques, and we'll advisor you thru universal initiatives builders fight to unravel. the 1st few chapters hide the fundamentals together with actions, Layouts, Widgets, and the Menu. From there, we conceal fragments and information garage (including SQLite), gadget sensors, the digital camera, and GPS. Then we circulation on extra complex themes similar to photographs and animation (including OpenGL), multi-threading with AsyncTask, and web performance with Volley. We'll additionally exhibit Google Maps and Google Cloud Messaging (also often called Push Notifications) utilizing the Google API Library.
Finally, we'll seriously look into numerous on-line prone designed specially for Android improvement. Take your program big-time with complete net net providers with no need to develop into a server admin by means of leveraging the ability of Backend as a provider (BaaS) services.
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Additional resources for Android Application Development Cookbook Second Edition
Within various layouts, we can also justify Views with Gravity and provide proportional size with Weight control. Layouts and ViewGroups can be nested within each other to create complex configurations. Over a dozen different Layout objects are provided for managing widgets, lists, tables, galleries, and other display formats, plus you can always derive from the base classes to create your own custom layouts. xml file (as shown in the following screenshot). layout. activity_main). For this recipe, we will create two, slightly different layouts and switch between them with a button.
Ff When a newly started activity fills the screen or makes our activity invisible, then our activity will enter the stopped state, and the resumption will always invoke a call to onRestart(). ff When an activity is in either the paused or stopped state, the operating system can (and will) remove it from the memory when the memory is low or when other applications demand it. 22 Chapter 1 ff It is worth noting that we never actually see the results of the onDestroy() method, as the activity is removed by this point.
Check for either RESULT_OK or RESULT_CANCEL and proceed accordingly. In our example, the second activity doesn't have a cancel button, so why bother to check? What if the user hits the back button? The system will set the result code to RESULT_CANCEL and the intent to null, which will cause our code to throw an exception. We made use of the Toast object, which is a convenient pop-up message that can be used to unobtrusively notify the user. It also functions as a handy method for debugging as it doesn't need a special layout or screen space.