Android How to Program 2nd Edition

When you create an app project, the IDE generates ________ as a subclass of Activity and provided the shell of an overridden onCreate method, which every Activity subclass must override. Answer: Main Activity Answer: Main Activity Answer: Main Activity ________ computing allows you to use software and data stored on remote computers (or servers)

You should ________ any apps you upload to Google Play to discourage reverse engineering of your code and further protect your apps. Answer: obfuscate Answer: obfuscate Answer: obfuscate The NumberFormat objects are used to format currency values and percentages, respectively. NumberFormat static method getCurrencyInstance returns a NumberFormat object that formats values as currency

Toast method makeText receives as arguments the Context on which the Toast is displayed, the message to display and the ________. Toast method show displays the Toast. Answer: duration for which the Toastwill be displayed Answer: duration for which the Toastwill be displayed Answer: duration for which the Toastwill be

(True/False) A SoundPool can play only one sound stream at once. Answer: False. A SoundPool can play many simultaneous sound streams. Answer: False. A SoundPool can play many simultaneous sound streams. Answer: False. A SoundPool can play many simultaneous sound streams. (True/False) If Android cannot find an image in the

To process simple touch events, you"ll override View method onTouchEvent, then use constants from class ________ (package android.view) to test which type of event occurred and process it accordingly. Answer: MotionEvent Answer: MotionEvent Answer: MotionEvent When a View is inflated, its constructor is called with a(n) ________ and an AttributeSet as arguments. Answer:

(True/False) Generally, each EditText should have a descriptive TextView that helps the user understand the EditText's purpose (also helpful for accessibility)otherwise, Android Lint issues a warning. Answer: True. Answer: True. Answer: True. You implement interfaceAdapterView.OnItemClickListener to respond when the user touches an item in a ListView. Answer: True. Answer: True. Answer: True. (True/False) Fragment lifecycle method onStop

A new class of objects can be created quickly and conveniently by ________; the new class absorbs the characteristics of an existing one, possibly customizing them and adding unique characteristics of its own. Answer: inheritance Answer: inheritance Answer: inheritance (True/False) According to the Android design guidelines for dialogs, most dialogs need

An AlertDialog.Builder object helps you configure and create an AlertDialog. The argument to the constructor is the ________ in which the dialog will be displayed. Answer: Context Answer: Context Answer: Context Before uploading your app to a device, Google Play or other app marketplaces, you must digitally sign the .apk file using a

Inherited method getResources returns the app's Resources object (package android.content.res) that can be used to ________ and determine information about the app's environment. Answer: access an app's resources Answer: access an app's resources Answer: access an app's resources Android's ________ feature enables the user to touch the screen to hear TalkBack speak what's on

Android devices are used worldwide. To reach the largest possible audience, you should consider customizing your apps for various locales and spoken languagesthis is known as ________. Answer: internationalization Answer: internationalization Answer: internationalization Your app must adhere to the ________ Policies. If your app is in violation of these policies, it can be removed

(True/False) By default, animations in an animation set are applied sequentially (i.e., one after the other). Answer: False. Actually, by default, animations in an animation setare applied simultaneously(i.e., in parallel). You can use the android:startOffsetattribute to specify the number of milliseconds into the future at which an animation should begin Answer: