-keepattributes Signature,*Annotation*
-keep public class org.xutils.** {
    public protected *;
}
-keep public interface org.xutils.** {
    public protected *;
}
-keepclassmembers class * extends org.xutils.** {
    public protected *;
}
-keepclassmembers @org.xutils.db.annotation.* class * {*;}
-keepclassmembers @org.xutils.http.annotation.* class * {*;}
-keepclassmembers class * {
    @org.xutils.view.annotation.Event <methods>;
}