jackqdyulei c76bb78758 Make BatteryDatabaseManager singleton
In BatteryTipLoader, two threads may access BatteryDatabaseManager
simultaneously. In this case thread A may close the database thread B
holds, then settings will crash.

In this cl, we make the BatteryDatabaseManager as singleton and
synchronize all the database related method. Then it shouldn't have
the crash anymore.

Bug: 73346734
Test: RunSettingsRoboTests
Change-Id: Ib53b2894b25155cca0c6ec60d1a816663d27a578
2018-02-14 14:24:02 -08:00
2015-04-13 09:21:39 -07:00
2017-10-13 15:59:03 -07:00
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3.1 GiB
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Java 89.8%
Kotlin 10.2%