android使用usb外接摄像头拍照并保存照片
在Android平台上，开发一款应用以支持USB外接摄像头进行拍照并保存照片是一项具有挑战性的任务。这个"android使用usb外接摄像头拍照并保存照片"的示例项目，旨在解决这个问题，提供了一个完整的解决方案，涵盖了从连接摄像头到捕获图像再到本地存储的全过程。
我们需要了解Android对USB设备的支持。Android系统支持USB主机模式（USB Host Mode），允许设备作为USB控制器，连接和支持其他USB设备，如外部摄像头。要启用这一功能，应用需要在AndroidManifest.xml文件中声明``标签，明确表示应用需要USB主机功能：
```xml
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