android:theme = "@android:style/Theme.Dialog" 将一个Activity显示为对话框模式

android:theme = "@android:style/Theme.NoTitleBar" 不显示应用程序标题栏

android:theme = "@android:style/Theme.NoTitleBar.Fullscreen" 不显示应用程序标题栏，并全屏

android:theme = "Theme.Light" 背景为白色

andorid:theme = "Theme.Light.NoTitleBar" 白色背景并无标题栏

android:theme = "Theme.Black" 背景为黑色

android:theme = "Theme.Black.NoTitleBar" 黑色背景并无标题栏

android:theme = "Theme.Black.NoTitleBar.Fullscreen" 黑色背景，无标题栏，全屏

android:theme = "Theme.Wallpaper" 用系统桌面为应用程序背景

android:theme = "Theme.Wallpaper.NoTitleBar" 用系统桌面为应用程序背景，且无标题栏

android:theme = "Theme.Wallpaper.NoTitleBar.Fullscreen" 用系统桌面为应用程序背景，无标题栏，全屏

android:theme = "Translucent" 透明背景

android:theme = "Theme.Translucent.NoTitleBar" 透明背景并无标题

android:theme = "Theme.Translucent.NoTitleBar.Fullscreen" 透明背景并无标题，全屏

android:theme = "Theme.Panel" 面板风格显示

android:theme = "Theme.Light.Panel" 平板风格显示