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Commit 46eb2d09 authored by Jeff Chang's avatar Jeff Chang
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Update saving persistent state documentation 

Updated the code snippet for saving persistent state to make the code
workable.
 - Update usage for getSharedPreferences.
 - Fix NPE when access mPrefs

Bug: 181924060
Test: Build
Change-Id: I695ad13282d5d9adb4a79108dfd1b6aae7b5a167
parent 238ab956
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