Save view state with onSaveInstanceState #661
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Does not work properly for configuration change
Finish state-saving api.
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The PDFView now automatically and accurately saves its view state (position, zoom) on configuration change and process destruction.
Additionally it provides apis to manually save and restore state in case you'd want to keep states of previous documents the user might return to.
The application developer has to make sure the same document is loaded after the restoration as before. The view has no ability to save and restore whole documents so relies on the host activity calling
load()with the same source as before the save.The automatic behaviour can be disabled with
setSaveEnabled(false);Close #330
Close #607