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应用的用户界面包含用户可查看并与之交互的所有内容。Android 提供丰富多样的预置 UI 组件,例如结构化布局对象和 UI 控件,您可以利用这些组件为您的应用构建图形界面。Android 还提供其他 UI 模块用于构建特殊界面,例如对话框、通知和菜单。

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