NO.23 When you build a Flutter app, you can use an Android or an IPhone emulator to test your app UI (user interface ) and its work flow. But you can NOT test this app on a real Android or IPhone device before publishing your app on Apple or Google store.

NO.24 Fill in the blank with the correct answer that completes the following sentence.
If you have any error in your Dart code of your Flutter app, the …………………….. at the status bar of your Android Studio displays the error description and also displays the line of the code on which the error is.
Also, in most cases the description field in this console gives you an idea about the reason of the error.
What is the name of this console?

NO.25 Assume that you have a Flutter app and the code of main.dart file is as follows:

Check the images in this question and answer which of these images is the run output of this app?

NO.26 A plug-in is used to enter the date in your Flutter app interface instead of asking an app user to add it manually.
Which is of the choices below represents this definition?

NO.27 Select the correct choice below to complete the following sentence:
SnackBar widget is used if you want to let your app pop up a message…………… at the bottom of your app interface.

NO.28 A Stateful widget is a dynamic widget which can change the appearance of its content in response to events triggered by user’s interactions or when it receives data.

NO.29 This Flutter widget is used to toggle the on/off state of a single setting. Which of the following choices represents this definition?

NO.30 Which of the following property should you use to add a label, icon, and an inline hint text to the TextField widget ?

NO.31 The following code is used to add a floating action button to a Flutter app interface.
Which of the following function or method can be used to add an action to this button if the app user tapsthis button?

NO.32 The image in this question includes a Dart code for a Raised button widget. When the app user taps this button, the app will display the content of Screen2( ) class of this app using Navigator.push navigation technique.

To do this you should replace the xxx in this Navigator.push class with …………

NO.33 The image in this question includes a Flutter app interface. Which Flutter widget has been added to this app title bar to add this navigation button?

NO.34 Flutter widgets are the basic building blocks of a Flutter user interface. Almost everything in Flutter app is a widget such as images, icons, texts, menus, buttons, row, column etc.

NO.35 You may add a lot of properties to your Container widget such as background color, size, padding, margins, borders or the shape of text, and other properties.

NO.36 How many child widgets can be added to the Container widget?

NO.37 While configuring your Android app on Firebase web site, you should download the google- services.json file from Firebase web site and add it to your Android app files as illustrated in the image of this question.

Select the best answer from the following choices: What is the main role of this file for your app?

NO.38 A floating action button in Flutter development is by default a circular icon button, and you should add the Icon widget as a child widget of FloatingActionButton widget.
Which of the following choices is correct to add a phone icon to the FloatingActionButton widget in a Flutter app ?

NO.39 Adding a Slider widget in a Flutter app interface should be used to select multiple values at the same time.

NO.40 …………….. command checks your environment and displays a report of the status of your Flutter and Android Studio other than IDE software installation.
Which of the following choices is the correct answer to fill in the blank above?