Not crash when UI objects disappear during visible objects verification

import androidx.test.uiautomator.BySelector;

import androidx.test.uiautomator.Configurator;

import androidx.test.uiautomator.Direction;

import androidx.test.uiautomator.StaleObjectException;

import androidx.test.uiautomator.UiDevice;

import androidx.test.uiautomator.UiObject2;

import androidx.test.uiautomator.Until;

    private String getVisiblePackages() {

        return mDevice.findObjects(By.textStartsWith(""))

                .stream()

                .map(object -> object.getApplicationPackage())

                .map(LauncherInstrumentation::getApplicationPackageSafe)

                .distinct()

                .filter(pkg -> !"com.android.systemui".equals(pkg))

                .filter(pkg -> pkg != null && !"com.android.systemui".equals(pkg))

                .collect(Collectors.joining(", "));

    }

    private static String getApplicationPackageSafe(UiObject2 object) {

        try {

            return object.getApplicationPackage();

        } catch (StaleObjectException e) {

            // We are looking at all object in the system; external ones can suddenly go away.

            return null;

        }

    }

    private String getVisibleStateMessage() {

        if (hasLauncherObject(CONTEXT_MENU_RES_ID)) return "Context Menu";

        if (hasLauncherObject(WIDGETS_RES_ID)) return "Widgets";