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Question
Lengthy data access should not be done in the UI thread; otherwise, the app will display an ________ (ANR) dialog, typically after five seconds of preventing the user from interacting with the app.Answer
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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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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?
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(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.
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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.
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(True/False) You process touch events by overriding the View method on Touch Event.
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(True/False) A FrameLayout is designed to display many Views.
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(True/False) You typically provide images and other visual resources in the highest available resolution so Android can scale each appropriately for each particular device's pixel density.
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(True/False) Unlike an app's drawable folders, which require their image contents to be at the root level in each folder, the assets folder may contain files of any type and they can be organized in subfolders.
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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.