Android Studio Error: Illegal characters: ' \ufeff ' and Gradle cannot automatically find XML custom attributes

one, illegal characters: ' \ufeff '

prompt when importing a project into Studio Error: Illegal character: ' \ufeff ' , the compiler did not error, but the compilation error, more headaches, and later found that the reason is because there is no use UTF-8 No BOM mode , Open the file with notepad++ or another editor and change the format to resolve it:

note: eclipse can intelligently convert a BOM file to a BOM-free file, currently Andorid studio did not do the processing. Below also simple say what is BOM (B byte order mark , is the name of the Uniform Code character located at the code point U+feff. When UTF-16 or UTF-32 is used to encode a string of ucs/Uniform code characters, this character is applied to indicate its byte order. It is often used as a notation for marking documents encoded in UTF-8, UTF-16, or UTF-32. The popular point is understood as

Second, Gradle cannot automatically find XML custom attribute problems

Gradle does not automatically find custom properties when a layout XML file appears:

In Gradle projects, always use Http://schemas.android.com/apk/res-auto for custom attributes

custom properties  < Span style= "Color:rgb (51, 51, 255); >http://schemas.android.com/apk/res/ http://schemas.android.com/apk/res-auto  > you can. example:

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Android Studio Error: Illegal characters: ' \ufeff ' and Gradle cannot automatically find XML custom attributes