[fpc-devel] FPC-JVM: Problem with String => CharSequence

Sven Barth pascaldragon at googlemail.com
Sat Aug 27 12:00:26 CEST 2011

Hello together!

Now that the cycle problem was solved  (I don't know whether it works, 
because I'm still trying to get a test working ^^), I've encountered the 
next problem. The android.widget.TextView class has a method setText 
that takes a CharSequence which is implemented by java.lang.String. As 
I've read in the wiki UnicodeString is mapped to that type. But the 
following code pieces don't compile (tv is the TextView of type AWTextView):

=== source begin ===

tv.setText('Hello World'); // Incompatible type for arg no. 1: Got 
"Constant String", expected "LongInt"

   s: UnicodeString;

s := 'Hello World';
tv.setText(s); // Incompatible types: got "UnicodeString" expected 

   s: UnicodeString;
   c: JLCharSequence;

s := 'Hello World';
c := s;
tv.setText(c); // Incompatible types: got "UnicodeString" expected 

// the following works though
   s: JLString;

s := 'Hello World';

=== source end ===

Can it be that the compiler doesn't check for the interfaces implemented 
by the mapped string type?


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