By Kyle Mew, Rick Boyer
The Android OS has the biggest set up base of any working procedure on the planet; there hasn't ever been a greater time to profit Android improvement to jot down your personal functions, or to make your personal contributions to the open resource community!
This “cookbook” will make it effortless that you should bounce to an issue of curiosity and get what you want to enforce the characteristic on your personal software. while you are new to Android and research most sensible by means of “doing,” then this ebook will offer many themes of interest.
Starting with the fundamentals of Android improvement, we movement directly to extra complex ideas, and we'll consultant you thru universal projects builders fight to unravel. the 1st few chapters disguise the fundamentals together with actions, Layouts, Widgets, and the Menu. From there, we disguise fragments and knowledge garage (including SQLite), equipment sensors, the digicam, and GPS. Then we circulation on extra complicated themes corresponding to pics and animation (including OpenGL), multi-threading with AsyncTask, and web performance with Volley. We'll additionally show Google Maps and Google Cloud Messaging (also referred to as Push Notifications) utilizing the Google API Library.
Finally, we'll look at a number of on-line providers designed specially for Android improvement. Take your program big-time with complete net internet companies with no need to develop into a server admin by means of leveraging the ability of Backend as a provider (BaaS) prone.
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Extra resources for Android Application Development Cookbook Second Edition
It will then immediately call onResume() and continue. 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.
Finishing"); } } When implementing these methods, always call the superclass before doing any work. There's more... Shutting down an activity To shut down an activity, directly call its finish() method, which in turn calls onDestroy(). To perform the same action from a child activity, use finishFromChild(Activity child), where child is the calling subactivity. It is often useful to know whether an activity is being shut down or merely paused, and the isFinishing(boolean) method returns a value that indicates which of these two states the activity is in.
The first two Views use the android:layout_ height="wrap_content" attribute, giving them a single line each. editTextMessage uses the following to specify the height: android:layout_height="0dp" android:layout_weight="1" When using the LinearLayout, it tells Android to calculate the height based on the weight. A weight of 0 (the default if not specified) indicates the View should not expand. In this example, editTextMessage is the only View defined with a weight, so it alone will expand to fill any remaining space in the parent layout.
Android Application Development Cookbook Second Edition by Kyle Mew, Rick Boyer