Deck 14: Making an Android Widget

Question 1

App widgets, also known as widgets, are small apps that are embedded in other apps, called app widget hosts.

Answer 1

True

Question 2

The Home screen and the ____________ screen are examples of app widget hosts.

Answer 2

Lock

Question 3

It is possible to style a widget with colors.

Answer 3

True

Question 4

What method of the RemoteViews class is the equivalent of the setText method of the TextView class?

A) setText
B) setViewText
C) setTextViewText
D) setTextView

Question 5

The minimum time between automatic updates for a widget is 30 minutes.

Question 6

What static method of the PendingIntent class can we use to create a PendingIntent?

A) createIntent
B) createPendingIntent
C) makePendingIntent
D) getBroadcast

Question 7

A JSON string can include two data structures: an object and a(n) ____________.

Question 8

It is possible to let the user customize a widget based on some user input.

Question 9

What is another name for the Lock screen?

A) Key
B) Guard
C) Keyguard
D) GuardKey

Question 10

The AppWidgetProviderInfo includes two constants that correspond to the Home screen and Lock screen widget categories.

Question 11

To create a widget, we need to extend the ____________ class or the BroadcastReceiver class.

Question 12

What is the name of the class that describes the metadata in a widget provider, such as icon and minimum width and height?

A) WidgetInfo
B) AppWidgetInfo
C) AppWidgetProviderInfo
D) ProviderInfo

Question 13

To create a widget, we define an AppWidgetProviderInfo object in an XML ____________ located in the res/xml directory.

Question 14

The URL class encapsulates a URL.

Question 15

The openConnection method of the URL class returns a(n) ____________ reference.

Question 16

The getInputStream method from the URLConnection class returns an InputStream.

Question 17

The AsyncTask class, from the android.os package, allows us to perform a task in the ____________.

Question 18

What package contains classes that enable us to create and manage widgets?

A) android.widgets
B) android.appwidget
C) widget.android
D) widget.app

Question 19

What method of the AppWidgetProvider class is called when the last widget of a type of widget is deleted from the host screen?

A) onDone
B) onDisabled
C) onUninstalled
D) onDestroyed

Question 20

What method of the RemoteViews class is the equivalent of the setTextColor method of the TextView class?

A) setColor
B) setTextColor
C) setTextViewTextColor
D) setTextViewColor

Question 21

Which one of these strings is the only valid JSON string?

A) { "cities": ("New York", "Palo Alto", "Boston") }
B) { "cities": {"New York", "Palo Alto", "Boston"} }
C) [ "cities": {"New York", "Palo Alto", "Boston"} ]
D) { "cities": ["New York", "Palo Alto", "Boston"] }

Question 22

What method of the AsyncTask class is automatically called after doInBackground finishes?

A) run
B) execute
C) onPostExecute
D) finish

Question 23

What attribute, included in the XML file defining the AppWidgetProviderInfo for the widget, specifies the frequency of updates of the widget?

A) android:updatePeriodMillis
B) android:millis
C) android:update
D) android:periodic

Question 24

What attribute, included in the XML file defining the AppWidgetProviderInfo for the widget, specifies the XML layout resource of the widget?

A) android:layout
B) android:view
C) android:initialLayout
D) android:xml

Question 25

What method of the AppWidgetProvider class is called when the widget first runs and when the widget is updated?

A) onRun
B) onStart
C) onUpdate
D) onRestart

Question 26

The getJSONObject method of the JSONObject class has this API:
JSONObject getJSONObject( String name )
What does it return?

A) The JSONObject calling that method
B) The JSONObject mapped to name if there is one
C) The string name
D) null

Question 27

Widgets can receive periodic updates.

Question 28

If we allow the user to configure the widget, we need to add to the app-provider element an android:configure attribute in the widget configuration XML file.

Question 29

There are no restrictions regarding the use of Views and layout managers inside a widget.

Question 30

A RemoteViews reference can be obtained by inflating an XML resource.

Question 31

It is possible to test a widget inside the emulator.

Question 32

The execute method of the AsyncTask class accepts a variable number of arguments.

Question 33

The __________________ method of the AppWidgetManager sets the RemoteViews for a widget based on its id.

Question 34

The JSONObject class, part of the org.json package, includes methods to parse a __________________ string.

Question 35

The AsyncTask class uses three generic types that we must specify when extending it. The class header of a subclass is as follows:
AccessModifier ClassName extends AsyncTask< Params, Progress, Result>
where Params, Progress, and Result are placeholders for actual __________________ names.