add new method callShowLocked() method so that subclass is able to call showLocked() method

MIUI-9411

add new method callShowLocked() method so that subclass is able to call showLocked() method

Change-Id: I2f22e806714d7e47376fbccabc83fff63f8f9caf
Fix the defect that auto-start mechanism cause null pointer crash

Change-Id: I34836da811c59c5af1c71a1e8a7927619798edaa