By Merrifield Mew Kyle
The booklet is written in a cookbook kind, offering examples within the form of recipes, permitting you to head on to your subject of curiosity, or persist with subject matters all through a bankruptcy to realize in-depth wisdom. while you are new to Android program improvement and searching out a short begin, or when you are an skilled Android developer searching for a reference consultant, then this e-book is for you. preferably, you need to comprehend a few Java and a bit approximately mark-up languages yet this can be in no way invaluable. This ebook will educate you the way to write down wealthy Android purposes from scratch very quickly.
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Extra info for Android 3.0 Application Development Cookbook
We also need a String constant: private static final String KEY = null; 21 Activities 3. text_view); 4. toString); } }); 5. Now is a good time to import any libraries. OnClickListener. View. 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.
Connect these up in the Java code using findViewById(). 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.
The demand for resources on a batteryoperated platform is managed quite ruthlessly by the system. Our activities can be dumped from memory when it's running low, without even a moment's notice, along with any data they contain. It is therefore essential that we understand the activity lifecycle and where our activities are on the back stack. Getting ready Android supplies a series of callbacks that are executed at each stage of the activity lifecycle and can be overridden, enabling us to anticipate user actions and execute code when the state of an activity changes.