JasperSoft has resolved this issue in the updated version of JasperMobile 1.7 app. It's working fine now for my android. Download it from Android Play Store.
Solution found bcprov-jdk16-145.jar file was missing, downloaded from Include jar file in lib or classpath folder. Below is the list of all required jars jasperreports-3.7.0.1.jar commons-io-1.3.1.jar commons-logging-1.0.4.jar commons-collections-3.2.jar commons-digester-1.7.jar commons-beanutils-1.8.0.jar groovy-all-1.5.5.jar itext-2.1.0.jar bcprov-jdk16-145.jar
Thanks very much friend. BUt this is not working. Its giving error message as "IncompatibleÂconditionalÂoperandÂtypesÂStringÂandÂBigDecimal"
But I did by other method and its working fine. I changed the field type "marks" to String and then I wrote following expression in Text field expression "$F{marks}.equals("0") ? "--" : $F{marks}"