By Merrifield Mew Kyle
The publication is written in a cookbook sort, providing examples within the form of recipes, permitting you to head on to your subject of curiosity, or keep on with themes all through a bankruptcy to realize in-depth wisdom. while you're new to Android program improvement and seeking out a short begin, or when you are an skilled Android developer searching for a reference advisor, then this e-book is for you. preferably, you want to recognize a few Java and a bit approximately mark-up languages yet this can be not at all worthwhile. This e-book will educate you the way to put in writing wealthy Android purposes from scratch very quickly.
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Additional resources for Android 3.0 Application Development Cookbook
Storing an activity's state A smart phone is a dynamic environment for software to exist in and an application can be interrupted for any number of reasons. Even turning the handset on its side will cause an activity to reload in orientation sensitive programs. Android provides SQLite for storing and retrieving data but this would a little heavy handed for storing an instance value or two and fortunately the activity class has built-in methods that we can override and use to store primitive name or value pairs.
In the code here we have named them mTextView, mEditText and mButton. 24 Chapter 1 How to do it... In this recipe the persistent data that we want to store is a string value used to represent the user's name. We will store this during the activity's onPause() method and restore the value in the onCreate() method (as they are called when we most likely need to restore and retrieve our preferences) but SharedPreferences can be applied anywhere: 1. Declare a class-wide String field, mUserName and a String constant KEY with value null.
Edit the default TextView so that it has a height of 100dip, text size of 26sp, and a background color of #333: android:layout_height="100dip" android:textSize="26sp" android:background="#333" 50 Chapter 2 2. Add another TextView beneath this one and give it both height and width of MATCH_ PARENT (or FILL_PARENT) and a background color of #666. 3. Using the AVD Manager, set up an emulator with an API level to match the project (no lower than 9). Give it a Resolution of 640 x 1024 pixels and an Abstracted LCD density of 320 dpi: 4.
Android 3.0 Application Development Cookbook by Merrifield Mew Kyle