By Merrifield Mew Kyle
The e-book is written in a cookbook type, offering examples within the type of recipes, permitting you to move on to your subject of curiosity, or stick to subject matters all through a bankruptcy to realize in-depth wisdom. while you are new to Android program improvement and seeking out a brief begin, or while you're an skilled Android developer trying to find a reference advisor, then this booklet is for you. preferably, you have to understand a few Java and a bit approximately mark-up languages yet this can be certainly not worthwhile. This e-book will educate you the way to jot down wealthy Android purposes from scratch very quickly.
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Extra resources for Android 3.0 Application Development Cookbook
6. onSaveInstanceState(state); } 7. getString(KEY)); } 8. Run the project on a device or emulator. Enter some text into the EditText view and click on the button. Then restart the activity by exiting and restarting or by rotating the handset. When the activity begins afresh, the TextView restores to its remembered state. 22 Chapter 1 How it works... The way these state saving methods work is really quite simple. When our application is dropped from memory, a Bundle of name/value pairs can be stored with the onSaveInstanceState() method.
To perform the same action from a child activity use the finishFromChild(Activity child) where child is the calling sub-activity. It is often useful to know whether an activity is being shut down or merely paused, and the isFinishing(boolean) method returns a value indicating which of these two states the activity is in. In this chapter we have seen the fundamental role that the Activity class plays in an Android application. Now that we can control the general structure of our projects, it's time to look more closely at the individual components such as layouts and fragments, components that make up the detail of our applications.
Fortunately, Android provides a way for us to not only ensure that our applications look how we want on any targeted screen configuration, but also make sure that they will not even be available to users with handsets that would not do our application justice. In this recipe we will configure an application using the
Android 3.0 Application Development Cookbook by Merrifield Mew Kyle