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This article mainly explains "how to use Activity to achieve custom dialog box", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "how to use Activity to achieve custom dialog box" bar!

In the Android Demo instance App- > Activity- > CustomDialog, use Activity to implement the custom dialog box, and there is nothing special about the class CustomDialogActivity itself. The key point is its definition in AndroidManifest.xml:

CustomDialogActivity uses the CustomDialog style (Theme).

Android applications can use custom interface styles (Theme), and Theme is a set of related Style definitions that can be applied to an Activity or an entire Application. One of the benefits of using Theme is that you can define a uniform interface style (uniform background colors, fonts, etc.) for the entire application.

Defining Theme is the same as defining Style, which must be defined under the / res/ values subdirectory. The difference between the root element name resources,Theme and Style is that Theme applies to Activity and Application, while Style applies to a single View. The method of definition is consistent. Style definitions support Inheritance, that is, new styles can be defined based on system-defined styles or previously defined styles:

For example, the definition of Theme.CustomDialog is based on Android's Dialog style (parent) and only modifies the WindowsBackground attribute, using a brown background.

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