Merge "Fix the issue the setting crashes after unmount SD card in landscape"

    // The mountToggle Preference that has last been clicked.

    // Assumes no two successive unmount event on 2 different volumes are performed before the first

    // one's preference is disabled

    private Preference mLastClickedMountToggle;

    private String mClickedMountPoint;

    private static Preference mLastClickedMountToggle;

    private static String mClickedMountPoint;

    // Access using getMountService()

    private IMountService mMountService = null;