By Kyle Mew, Rick Boyer
The Android OS has the biggest deploy base of any working procedure on the earth; there hasn't ever been a greater time to profit Android improvement to put in writing your personal purposes, or to make your individual contributions to the open resource community!
This “cookbook” will make it effortless so that you can leap to an issue of curiosity and get what you want to enforce the function on your personal program. while you are new to Android and study top by way of “doing,” then this e-book will offer many subject matters of interest.
Starting with the fundamentals of Android improvement, we flow directly to extra complex innovations, and we'll advisor you thru universal initiatives builders fight to resolve. 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 flow on extra complicated issues equivalent to pics and animation (including OpenGL), multi-threading with AsyncTask, and net performance with Volley. We'll additionally reveal Google Maps and Google Cloud Messaging (also often called Push Notifications) utilizing the Google API Library.
Finally, we'll look at numerous on-line prone designed particularly for Android improvement. Take your program big-time with complete web internet companies with no need to develop into a server admin via leveraging the facility of Backend as a carrier (BaaS) companies.
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Extra resources for Android Application Development Cookbook Second Edition
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. 23 2 Layouts In this chapter, we will cover the following topics: ff Defining and inflating a layout ff Using RelativeLayout ff Using LinearLayout ff Creating tables – TableLayout and GridLayout ff Using ListView, GridView, and Adapters ff Changing layout properties during runtime ff Optimizing layouts with the Hierarchy Viewer Introduction In Android, the User Interface is defined in a Layout.
Xml file so it includes a button as defined here: 2. xml. Change the button so it matches the following: 3.
Show(); } }); } 40 Layouts As you can see, there's more setup code for the GridView than there was for the ListView. The onCreate() method creates a new GridView and passes it in the setContentView() call. ) The ListViewActivity base class handles much of this, but the GridView does not have a corresponding activity class to extend. Changing layout properties during runtime In Android development, it's generally the preferred practice to define the UI with XML and the application code in Java, keeping the User Interface code separate from the application code.