March 2013
Beginner to intermediate
580 pages
16h 11m
English
Content preview from Android Programming: The Big Nerd Ranch GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Saving Data Across Rotation
Android does a great job of providing alternative resources at the right time. However, destroying and recreating activities on rotation can cause headaches, too, like GeoQuiz’s bug of reverting back to the first question when the device is rotated.
To fix this bug, the post-rotation QuizActivity needs to know the old value of mCurrentIndex. You need a way to save this data across a runtime configuration change, like rotation. One way to do this is to override the Activity method
protected void onSaveInstanceState(Bundle outState)
This method is normally called by the system before onPause(), onStop(), and onDestroy().
The default implementation of onSaveInstanceState(…) asks all of the activity’s views to save ...
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