Android 自定义注解

public interface UserConstant {
    /**
     * 性别
     */
    int GIRL = 0;
    int BOY = 1;
}

@Retention(RetentionPolicy.SOURCE)
@Target({ElementType.PARAMETER})
@IntDef(value = {UserConstant.BOY, UserConstant.GIRL})
public @interface Gender {
}