Android Dialogs(1)Dialog簡介及Dialog分類

Dialogs

　　A dialog is a small window that prompts the user to make a decision or enter additional information. A dialog does not fill the screen and is normally used for modal events that require users to take an action before they can proceed.

Dialog Design

　　For information about how to design your dialogs, including recommendations for language, read the Dialogs design guide.

The 

Dialog

 class is the base class for dialogs, but you should avoid instantiating 

Dialog

 directly. Instead, use one of the following subclasses:

AlertDialog

        A dialog that can show a title, up to three buttons, a list of selectable items, or a custom layout.

DatePickerDialog

 or 

TimePickerDialog

        A dialog with a pre-defined UI that allows the user to select a date or time. ProgressDialog

　　Android includes another dialog class called 

ProgressDialog

 that shows a dialog with a progress bar. However, if you need to indicate loading or indeterminate progress, you should instead follow the design guidelines for Progress & Activity and use a

ProgressBar

 in your layout.

These classes define the style and structure for your dialog, but you should use a 

DialogFragment

 as a container for your dialog. The

DialogFragment

 class provides all the controls you need to create your dialog and manage its appearance, instead of calling methods on the 

Dialog

 object.

Using 

DialogFragment

 to manage the dialog ensures that it correctly handles lifecycle events such as when the user presses the Backbutton or rotates the screen. The 

DialogFragment

 class also allows you to reuse the dialog's UI as an embeddable component in a larger UI, just like a traditional 

Fragment

 (such as when you want the dialog UI to appear differently on large and small screens).

　　The following sections in this guide describe how to use a 

DialogFragment

 in combination with an

AlertDialog

 object. If you'd like to create a date or time picker, you should instead read the Pickers guide.

Note: Because the 

DialogFragment

 class was originally added with Android 3.0 (API level 11), this document describes how to use the 

DialogFragment

 class that's provided with the Support Library. By adding this library to your app, you can use 

DialogFragment

 and a variety of other APIs on devices running Android 1.6 or higher. If the minimum version your app supports is API level 11 or higher, then you can use the framework version of 

DialogFragment

, but be aware that the links in this document are for the support library APIs. When using the support library, be sure that you import 

android.support.v4.app.DialogFragment

 class and not 

android.app.DialogFragment

.

轉載于:https://www.cnblogs.com/sjjg/p/4622823.html