您可以通过 File => Settings (快捷键 CTRL+ ALT+ S) ，从左侧面板选择 Appearance ，现在从右侧面板选择 主题.

You can change it by going File => Settings (Shortcut CTRL+ ALT+ S) , from Left panel Choose Appearance , Now from Right Panel choose theme.

Android Studio 2.1

偏好 ->搜索外观 ->UI 选项，点击下拉主题

Preference -> Search for Appearance -> UI options , Click on DropDown Theme

Android 2.2

Android 工作室 ->文件 ->设置 ->外观&行为 ->寻找 UI 选项

Android studio -> File -> Settings -> Appearance & Behavior -> Look for UI Options

导入外部主题

您可以从这个网站下载自定义主题.选择你的主题，下载它.设置主题转到 Android studio ->文件 ->导入设置 -> 选择下载的 .jar 文件.

You can download custom theme from this website. Choose your theme, download it. To set theme Go to Android studio -> File -> Import Settings -> Choose the .jar file downloaded.