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Question
(True/False) When an app first executes, overridden Activity lifecycle method onStart is before after onCreate.Answer
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Related questions
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To use in-app billing, you"ll need a ________ account and a Google Wallet merchant account. Google pays you 70% of the revenue for all in-app purchases made through your apps.
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(True/False) According to Google, apps that use in-app billing earn profoundly more revenue than paid apps alone.
Q:
(True/False) It's considered a good practice to place strings, string arrays, images, colors, font sizes, dimensions and other app resources in XML files within the subfolders of the project's res folder, so that the resources can be managed separately from your app's Java code. This is known as internalizing the resources.
Q:
(True/False) High-resolution images do not scale well.
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A ________ layout arranges GUI components relative- to one another or relative to the layout itself; for example, you can specify that a GUI component should appear below another GUI component and centered horizontally within the layout.
Q:
(True/False) When developing apps for distribution, to reach the largest audience, you should target all Android devices.
Q:
Android's ________ enables the user to touch the screen to hear TalkBack speak what's on the screen near the touch.
Q:
People with visual and physical disabilities can use Android's ________ to allow a device to speak screen text or text that you provide to help them understand the purpose and contents of a GUI component.
Q:
Which of the following statements is false?
a. Text can be displayed in a TextView and pictures can be displayed in ImageViews.
b. You use the Graphical Layout editor's Palette of GUI controls to drag and drop ImageViews onto the GUI.
c. It's considered good practice to define all strings and numeric values in resource files that are placed in the subfolders of a project's resources.xml folder.
d. An example of a string resource is the text on a TextView. An example of a measurements resource is a font's size.
Q:
Which of the following statements about workspaces is false?
a. A workspace is a collection of projects, and each project is typically an app or a library that can be shared among apps.
b. Each workspace also has its own settings, such as where various Eclipse subwindows are displayed.
c. You can have many workspaces and switch between them for different development tasks.
d. You could have separate workspaces for Android app development, Java app development and web app development, each with its own custom settings.
e. All of the above statements are true.
Q:
(True/False)You call CursorAdapter method changeCursor with the argument true to remove the Cursor from the CursorAdapter.
Q:
(True/False) Each AsyncTask can be executed many times.
Q:
You call ListView method ________ to indicate that only one item can be selected at a time.
Q:
When we need a database operation's results in the GUI thread, we"ll use a subclass of ________ (package android.os) to perform the operation in one thread and receive the results in the GUI thread.
Q:
Color's static methods alpha-, red, green and blue extract the ARGB values from the color, and SeekBar's ________ method positions the thumbs.
Q:
(True/False) Store the image in the device's Gallery by calling class MediaStore.Images.Media's insertImage method. Method insertImage returns a String representing the image's location on the device, or null if the image could not be saved.
Q:
Call Path's ________ method to set the Path's starting coordinates and specify the new Point's x and y values.
Q:
Which of the following statements is false?a. Motion-Event's getActionMaskedmethod returns an int representing the MotionEvent type, which you can use with constants from class MotionEvent to determine how to handle each event.b. Motion-Event's getActionIndex method returns an integer index representing which finger caused the event. This index is the finger's unique ID.c. To get the finger's unique ID that persists across MotionEvents until the user removes that finger from the screen, we"ll use Motion-Event's getPointerID method, passing the finger index as an argument.d. If the action is MotionEvent.ACTION_DOWN or Motion Event.ACTION_POINTER_DOWN, the user touched the screen with a new finger.
Q:
When a View needs to be redrawn, its onDraw method is called. The first argument is the Bitmap to draw, the next two arguments are the x-y coordinates where the upper-left corner of the Bitmap should be placed on the View and the last argument is the ________ object that specifies the drawing characteristics.
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(True/False) You set a line's width using Paint's setLineWidth method.
Q:
You register to receive accelerometer events using SensorManager's registerListener method. One of its arguments is the rate at which sensor events should be delivered to the app. Why would you specify SENSOR_DELAY_NORMAL to receive sensor events at the default rate, instead of choosing a faster rate?
Q:
(True/False) Like an Activity, a Fragment can place items in the app's action bar and options menu. To do so, the Fragment must call its setHasOptionsMenu method with the argument true.
Q:
(True/False) A GestureDetector allows an app to react to user interactions such as flings, single taps, double taps, long presses and scrolls by implementing the methods of interfaces GestureDetector.OnGestureListener and Gesture-Detector.On-Double-Tap-Listener interfaces.
Q:
You use the type of a ________ to determine whether the user has touched the screen, dragged across the screen or lifted a finger from the screen.
Q:
(True/False) You process touch events by overriding the View method on Touch Event.
Q:
The last Fragment lifecycle method called when a Fragment is about to be detached from a parent Activity is ________.
Q:
Q: The process of building an object of a class before a program can perform the tasks that the class's methods define is called instantiation. A class is then referred to as an instance of its object.
Q:
Before running an app in the emulator, you"ll need to create a(n) ________, which defines the characteristics of the device on which you want to test, including the hardware, system image, screen size, data storage and more.
Q:
Which package includes user interface classes for layout and user interactions?
a. android.app
b. android.graphics
c. android.media
d. android.view
Q:
Android uses a collection of ________, which are named groups of related, predefined classes.