问题：
error: Error: No resource found that matches the given name (at 'icon' with value '@mipmap/Icon'). Phoneword E:\Phoneword\Phoneword\obj\Debug\android\manifest\AndroidManifest.xml
解决方法：
Here's a workaround. Go into assemblyinfo.cs (it's in the Properties folder in your project) and add the following line in there:
[assembly: Application(Icon = "@mipmap/icon")]
