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Questions and Answers
What function is used to set the title of a dialog in Android?
setTitle
What function is used to add multiple choice items to a dialog in Android?
In Android, how can a custom layout be added to a dialog?
setView
Match the following Android components with their functionalities:
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What is the purpose of toasts in Android applications?
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How can you create and display a toast in Android?
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What are some similarities between Snackbars and Toasts?
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Dialogs in Android are used for prompting users to make decisions.
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The base class for dialogs in Android is ___.
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Study Notes
Short Interactions with the User
- Android offers different ways to implement short interactions with the user, including toasts, snackbars, and dialogs.
Toasts
- Toasts are short messages shown in a small window for a limited period of time.
- They can be created using the
makeTextmethod and made visible using theshowmethod. - There are two durations for toasts:
Toast.LENGTH_LONGandToast.LENGTH_SHORT. - Toasts can be created in one line of code using the
makeTextmethod and theshowmethod.
Snackbars
- Snackbars are a new way of communication from Material Design.
- They are very similar to toasts.
- Snackbars can include an action button.
- They can be created using the
Snackbar.makemethod and made visible using theshowmethod. - Snackbars can be used to show a message and an action button, and can be customized with a callback.
Dialogs
- Dialogs are small windows that prompt the user to make a decision or enter additional information.
- The base class for dialogs is
Dialog, but it's better to use one of the subclasses, such asAlertDialogorDatePickerDialog. - Dialogs can be managed using a
DialogFragment. - Dialogs can be used for short interactions, and can be created with a builder and presented using the
showmethod.
Dialog Creation
- Dialogs can be created using a
DialogFragmentand overriding theonCreateDialogfunction. - The creation of the dialog works as before, and it is possible to pass information to and from the activity.
- Dialogs can have a title, content area, and buttons.
Dialog Components
- The title is optional and can be set using the
setTitlemethod. - The content area can have a message, list, or custom layout.
- Buttons can be positive, negative, or neutral, and can have a listener to respond to the action.
Accessing the View Model
- The
DialogFragmentcan recover theViewModelof the activity using theactivityViewModelsfunction. - This requires the
fragment-ktxdependency in the app build.gradle file.
Adding Lists and Radio Buttons
- Lists can be added to a dialog using the
setItemsfunction. - Radio buttons can be added to a dialog using the
setSingleChoiceItemsfunction. - Multiple choice lists can be added to a dialog using the
setMultiChoiceItemsfunction.
Using a Custom View
- It is possible to use a custom layout in a dialog.
- The layout is inflated and added to the dialog using the
setViewfunction. - The custom view can be used to display custom data and can be customized with a callback.
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Description
This quiz covers different ways of implementing short interactions with the user in Android, including Toasts, Snackbars, and Dialogs.
