Hi DonManfred,
I tried the code from your given link but now have some another error like this
javac 1.8.0_152
shell\src\b4a\example\billing_subs_0.java:100: error: cannot find symbol
billing.mostCurrent._edttableno.runMethodAndSync(true,"setText",BA.ObjectToCharSequence(billing.mostCurrent._service._tablno));
What is the problem behind this.