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Take your Android programming skills to the next level with the Android built-in framework that enables local data management in text files and SQLite-based relational databases. This course shows you how to create datacentric apps for Android devices, using SQLite, Java, and the built-in android.database packages. Author David Gassner describes how to define shared preferences, work with JSON and XML files in internal and external data stores, and create new local SQLite databases.
I'll be using the Android emulator to test and debug my applications throughout this video series. Here I'll show you the steps I follow to create my emulator. I'll go to the ADT menu and choose Window > Android Virtual Device Manager. You can either go to the Device Definitions screen and choose one of the preexisting definitions or you can create a definition from scratch on the Android Virtual Devices tab. I will start from that tab and click New.
I'll name my new Android virtual device JellyBean. In this version of ADT, there are four specific device definitions for actual devices: the Nexus 7, the Galaxy Nexus, the Nexus S, and the Nexus One. Then there are a bunch of predefined device definitions that are generic. I'm going to start with a fairly small device, which will make everything very readable on my screen. It will be the 3.2 QVGA device definition, which uses a medium pixel density.
I'm setting my target to the only SDK that I have installed: Android 4.2. Because all of the exercise files for this course are defined for that version of the SDK, I recommend that you do the same. Make sure that you've selected the options to allow hardware keyboard input. This will let you type values in from your own keyboard and the skin that displays the skin with hardware controls. I'll add a virtual SD card with a size of 64, and then I'll click OK and that creates the virtual device.
Then I'll click on the virtual device and I'll click Start. On the Launch Options screen, I'll accept all of the defaults and click Launch. That starts up your emulator. Now this will be for a very small cellphone, and if you want to emulate a more recent device, such as the Nexus 7, you can choose that too. I'm using this particular virtual device to make all of the text very readable on the screen. You might also see a dialog that pops up, asking you whether you want to use Logcat to log information from the emulator.
I recommend saying yes. This will cause the emulator to take quite a while to start up the first time, but once it's open, you can keep the emulator open throughout all of your development work and not have to hit this pause every time you want to test an application. Once the emulator comes to life, you should see this Welcome screen. You can click OK and that will take you to the emulator's home screen. From this screen, you can do any setup you'd like. For example, the emulator goes to sleep by default after a very short amount of inactive time.
To change that, I'll go to my apps list and then I'll type settings. That should take me to a search screen and I can choose the Settings application. I'll click on Display and then on Sleep, which defaults to sleeping after one minute of inactivity. I'll change that to 30 minutes. Then I'll click the Home button and that takes me back to the Home screen. So now my virtual device is set up and ready to use, and I'm ready to create my first application.
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