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Download Android 3.0 Application Development Cookbook by Merrifield Mew Kyle PDF

By Merrifield Mew Kyle

The publication is written in a cookbook type, offering examples within the sort of recipes, permitting you to move on to your subject of curiosity, or keep on with themes all through a bankruptcy to realize in-depth wisdom. when you are new to Android program improvement and seeking out a short commence, or when you are an skilled Android developer trying to find a reference consultant, then this publication is for you. preferably, you'll want to understand a few Java and a bit approximately mark-up languages yet this is often on no account helpful. This e-book will educate you the way to write down wealthy Android purposes from scratch very quickly.

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Example text

With the use of the pipe character ( | )it is possible to apply more than one gravity attribute to a view or view group. For example, the following will both centre and raise its owner: android:layout_gravity="top|center" It should be noted that the layout_gravity and gravity tags are not the same thing. Where layout_gravity dictates where in its parent a view should lie, gravity simply controls the positioning of the contents of a view—for example the alignment of text in a button or text view.

This Bundle is then handed back when the activity restarts to both the onRestoreInstanceState() and the onCreate() methods. This is an important point as the Bundle is made available to both procedures and gives us a choice over where and how to handle activity restarts. This is because onRestoreInstanceState() is not called until after onStart() meaning we can apply any initialization that we may need before restoring our values. There's more... The two methods introduced here are not the only way to ensure that a screen component's state is stored.

Append("\n pausing"); } 5. append("\n resuming"); } 6. Repeat this for each of the remaining lifecycle callbacks, onStart(), onRestart(), onStop(), and onDestroy(). 7. Run the application and observe what happens when the activity is interrupted by pressing the Back and Home keys or when a call is sent to or from the phone. 28 Chapter 1 How it works... Take a look at the next diagram. Our activity can exist in one of three states: active, paused, or stopped. There is also a fourth state, destroyed, but we can safely ignore it: 29 Activities An activity is in the active state when its interface is available to the user.

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