Download Android 3.0 Application Development Cookbook by Merrifield Mew Kyle PDF

By Merrifield Mew Kyle

The ebook is written in a cookbook type, featuring examples within the form of recipes, permitting you to head on to your subject of curiosity, or persist with issues all through a bankruptcy to achieve 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 searching for a reference advisor, then this booklet is for you. preferably, you'll want to recognize a few Java and a bit approximately mark-up languages yet this is often on no account invaluable. This ebook will educate you ways to jot down wealthy Android purposes from scratch very quickly.

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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. 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.

20 Chapter 1 1. Create a new application project and call it StateSaver. 2. xml layout file: ‰‰ An EditText ‰‰ A Button ‰‰ A TextView 3. Provide them with the following android:ids: ‰‰ @+id/edit_text ‰‰ @+id/button ‰‰ @+id/text_view 4. Change the text in the boxes to match the following screenshot: How to do it... In this recipe we will create a simple application that 'remembers' a line of text that we enter when the activity is reloaded. To do this we override the activity's onSaveInstanceState() and onRestoreInstanceState() methods: 1.

My_layout); } } 11. Finally, run this exercise on a handset or emulator and use the two buttons to switch between layouts. How it works... Clearly the key command here is the call to setContentView() which we have come across before, as Eclipse includes it in the onCreate() method, to automatically inflate the main layout, whenever we build a new project. The setting of orientation to horizontal is not connected to screen orientation but controls whether each view in the layout is placed to the right-hand side of or beneath the preceding one, regardless of which way the handset is being held.

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