i have put com.saikoa.dexguard.eclipse.adt_*.jar file in dropin folders of eclipse.And modified the Proguard-Project and Project-Properties Files in android Project.And i build
DexGuard provides the option -encryptassetfiles to encrypt assets. It is documented in the DexGuard manual > Settings > -encryptassetfiles. The samples directory also contains a sample project that illustrates the feature.