By C. Thomas Wu;Theodore A. Norman
This can be an introductory e-book for college kids with out historical past in programming, which teaches them how one can write object-oriented courses. scholars first research programming fundamentals by utilizing predefined Graphical person Interface (GUI) items. by utilizing those predefined items, they need to clutch the techniques and merits to object-oriented programming, how to find their very own gadgets and the way to advance courses utilizing object-oriented layout technique. in addition they are taught glossy programming subject matters, comparable to event-driven programming.
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Additional info for An Introduction to Programming: An Object-Oriented Approach With C++
If the user presses the Back button, because you’ve saved this transaction on the back stack, the new dialog is dismissed and the previous dialog is displayed. This is a handy way of displaying a help dialog, for example. 52 CHAPTER 3: Working with Dialogs Implications of a Dialog Dismiss When you add any fragment to a fragment manager, the fragment manager does the state management for that fragment. This means when a device configuration changes (for example, the device rotates), the activity is restarted and the fragments are also restarted.
Taking advantage of these makes configuration changes quick and painless. Keep data and business logic outside of activities if you can. The configuration change process is somewhat similar between activities and fragments. When an activity is being destroyed and re-created, the fragments within that activity get destroyed and re-created. What we need to worry about then is state information about our fragments and activity, such as data currently being displayed to the user, or internal values that we want to preserve.
It’s very nice that your titles fragment class doesn’t need to include much code to deal with the device reconfiguration. Take a moment to view this application’s manifest file. In it you find the main activity with a category of LAUNCHER so that it will appear in the device’s list of apps. Then you have the separate DetailsActivity with a category of DEFAULT. This allows you to start the details activity from code but will not show the details activity as an app in the App list. Persistence of Fragments When you play with this sample application, make sure you rotate the device (pressing Ctrl+F11 rotates the device in the emulator).