Add external lib in Android.mk

1. add LOCAL_STATIC_JAVA_LIBRARIES += jar'sFileName . This line must be added above "include $(BUILD_PACKAGE)"

2. add LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := pathtoyourlib.jar This line must be added after "include $(BUILD_PACKAGE)"

3. add include $(BUILD_MULTI_PREBUILT)


then compile it