如何将TypeDef保留在Proguard中？

Question

我正在尝试使用android proguard混淆TypeDef。

@Retention(RetentionPolicy.SOURCE)
@IntDef({NumberId.NUMBER_ONE, NumberId.NUMBER_TWO, NumberId.NUMBER_THREE, NumberId.NUMBER_FOUR})
public @interface NumberId {
    int NUMBER_ONE = 1;
    int NUMBER_TWO = 2;
    int NUMBER_THREE = 3;
    int NUMBER_FOUR = 4;
}

我正在使用的proguard保持不变

-keepattributes *Annotation*

-keepclassmembers class ** {
      @<package_name>.NumberId public *;
}