By Chris Haseman

Android necessities is a no-frills, no-nonsense, code-centric run during the guts of software improvement on Google's cellular OS. This e-book makes use of the improvement of a pattern program to paintings via issues, targeting giving builders the basic instruments and examples required to make plausible advertisement functions paintings. overlaying everything of the Android catalog in below one hundred fifty pages is just very unlikely. in its place, this ebook specializes in simply 4 major issues: the appliance existence cycle and OS integration, consumer interface, location-based providers, and networking.

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Each activity, as it’s launched from within your application, is placed on a screen stack. Android is already configured to handle closing down the top activity and activating the one under it when you ask or when the user presses Back. This setup allows you to think of every activity as the base for a single screen. Each activity may contain different views and view groups in a hierarchical tree. You can visualize this tree with the view groups and layout objects as the trunk and branches (because view group objects can be cast into views) and with the views or widgets as the leaves.

You do not have direct access to files inside of a content provider. Don't touch this. ” It’s good to know that even the technical writers for Android’s documentation have a sense of humor. Fetching the User’s Bookmarks It should be obvious, at least at this point, that a developer could do some fairly nefarious things with access to a user’s bookmarks. It’s not clear, at this point, what Android will do to keep this sort of thing from happening. I suppose it’s up to the carriers to lock down or monitor this behavior.

The following is an example of how to get a pointer to the View object when your application starts up. loginbutton); } Here you’ve acquired a pointer to the login button by calling findViewById. This allows you to add a click listener so that you’ll be notified when the button is selected (on a touch screen with a stylus) or selected by the center softkey. info { public void onClick(View v) { grabEnteredText(); } }; ... } The previous inline definition, when notified that a selection has occurred, calls the grabEnteredText method.

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