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Extra info for Pro Android 5

Sample text

Going from onStop to onStart. You can use this knowledge in onStart if you want to optimize code there based on whether it is a fresh start or a restart. When it is a restart the view and their state are fairly intact. You can do things in this method that would have been done in onStart, but optimized when the activity is not visible, but too expensive to be done multiple times in onResume. Object onRetainNonConfigurationInstance( ) This callback method is in place to deal with activity re-creation due to configuration changes.

This is an indication that this method is for storing persistent data and also in an external storage medium such as a file or a network. You can also use this method to stop any counters, animations, or status displays of a background task. You can resume them in onResume. void onStop( ) The callback method onStop() moves the activity from partially visible to the background state while keeping all of the view hierarchies intact. This is the counterpart of onStart. The activity can be taken back to the visible cycle by calling onStart.

The uses-sdk directive indicates the API for which this app is backward compatible. The application node has a number of properties including its label and an icon that will show up in the Android device apps menu. Inside an application node we need to define all of the activities that make up this application. Each activity is identified by its respective java classname. If the activity classname is not fully qualified, then the java package is assumed to be the same as the application package identified.

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