Cannot resolve symbol 'layout_all_commodity'

"Cannot resolve symbol 'layout_all_commodity'" 这个错误通常意味着 Android Studio 无法找到名为 'layout_all_commodity' 的布局文件。这可能是由以下几个原因导致的：

1. 布局文件名称错误：请确保你的布局文件名为 'layout_all_commodity.xml'，并且位于正确的目录中。检查文件名的拼写和大小写是否与代码中引用的一致。

2. 布局文件未在项目中：如果你刚刚创建了布局文件，可能需要重新构建项目以使 Android Studio 更新项目索引。尝试点击菜单栏中的 "Build"，然后选择 "Rebuild Project"。

3. 布局文件在其他模块中：如果你的项目有多个模块，可能需要在代码中正确引用布局文件所在的模块。确保使用正确的模块名称来引用布局文件。

4. 布局文件存在语法错误：检查布局文件的内容是否存在任何语法错误。如果有，修复这些错误，并重新构建项目。

如果以上步骤都没有解决问题，可以尝试清理项目并重新构建。点击菜单栏中的 "Build"，然后选择 "Clean Project"，然后再次尝试导入布局文件。

相关问题

Cannot resolve symbol 'ACTION_USB_STATE'

`ACTION_USB_STATE` is a constant defined in the `android.hardware.usb.UsbManager` class. It is used to broadcast USB state changes. If you are getting the error "Cannot resolve symbol 'ACTION_USB_STATE'", it means that you haven't imported the necessary class or there might be an issue with your Android project configuration.

To resolve this issue, make sure you have the following import statement at the top of your Java file:

import android.hardware.usb.UsbManager;

Also, ensure that you have the necessary permissions declared in your AndroidManifest.xml file:

<uses-permission android:name="android.permission.USB_PERMISSION" />

If you have already done these steps and still encounter the issue, try cleaning and rebuilding your project or restarting your IDE.

Cannot resolve symbol 'WRITE_EXTERNAL_STORAGE'

This error typically occurs when you are trying to use the WRITE_EXTERNAL_STORAGE permission in your Android application but have not declared it in the AndroidManifest.xml file.

To resolve this error, add the following line of code to your AndroidManifest.xml file:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

This will declare the WRITE_EXTERNAL_STORAGE permission and allow your application to write to external storage.