asmack4.0.0-rc1 and later version run crash

I build with Eclipse added asmack 4.0.4 and dnsjava2.0.1, compile success, but crash when running in android pad. The error is: java.lang.NoClassDefFoundError:org.jivesoftware.smack.SmackAndroid. If I replace with asmack0.8.10, it work well. Please give me some advise, thank you!