@Override public boolean onCreate() {
		Log.v(TAG, "onCreate()");
		final int priority = IntentFilter.SYSTEM_HIGH_PRIORITY - 1;
		@SuppressLint("InlinedApi") final String ACTION_PROFILE_OWNER_CHANGED = DevicePolicyManager.ACTION_PROFILE_OWNER_CHANGED;
		context().registerReceiver(mProfileChangeObserver, IntentFilters.forActions(Intent.ACTION_MANAGED_PROFILE_ADDED,// ACTION_MANAGED_PROFILE_ADDED is sent by DevicePolicyManagerService.setProfileEnabled()
				Intent.ACTION_MANAGED_PROFILE_REMOVED, ACTION_PROFILE_OWNER_CHANGED).inPriority(priority));             // ACTION_PROFILE_OWNER_CHANGED is sent after "dpm set-profile-owner ..."
		refreshUsers(context());
		return true;
	}
Utility class for user-related helpers. Only works within the process where this provider is declared to be running.

Created by Oasis on 2016/9/25.
shared/src/main/java/com/oasisfeng/island/util/Users.java