[DUG] Strange Error in Android

[Jolyon Smith]

Also, to fix the problem you can avoid the bug by ensuring that your 
string is loaded via the stream based code path by ensuring that your 
UTF-8 encoded XML is not using the inappropriate 
WideString/DOMString/UnicodeString type, but the more appropriate 
ANSIString/UTF8String type.

This is why CheckEncoding is trying to remove the encoding declaration 
from the XML string in the first place: the string based loading path 
only supports WideStrings, only Wide encodings are supported (UTF-16, 
UCS-2 etc).

Unfortunately, in your case, things aren't quite so simple because the 
ANSIString version of LoadXMLData is not supported by NEXTGEN compilers, 
of which the Android compiler is one.

This means that you can't use the LoadXMLData() convenience method and 
will instead have to instantiate a TXMLDocument yourself.  Even then, 
the ANSIString version of LoadFromXML() is again not supported on 
NEXTGEN compilers, so to trigger a codepath that does not invoke 
CheckEncoding you will have to use the XML TStrings property:

   doc := TXMLDocument.Create;
   doc.XML.Text := myXMLString;

I haven't checked to see whether assigning a WideString XML string that 
contains an encoding declaration that identifies UTF-8 (incorrectly) 
will cause problems if the DOM implementation then attempts to respect 
the declared encoding (since the stringlist code path will leave the XML 
encoding declaration intact and process the XML string itself as a 
WideString, contrary to the declared encoding).

Perhaps the safest approach, given that unless you have taken specific 
steps to ensure otherwise, your string is almost certainly a WideString 
and so the UTF-8 encoding declaration is indeed incorrect, would be to 
remove the encoding yourself using a more robust method than 
CheckEncoding() employs, and ensure that you remove the encoding before 
passing it to LoadXMLData().



If it were me I would simply use the platform's own XML support, but 
that is even more difficult given that you are using Delphi for your 
Android code so access to those platform capabilities is even more 
difficult than wrestling with the mess that String support has become in 
Delphi these days.

Good luck.



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