自定义注解Annotation的注释

自定义注解Annotation的注释

1.很不错的一个例子

Name姓名注解：

@Target(ElementType.FIELD)  
@Retention(RetentionPolicy.RUNTIME)  
@Documented  
public @interface Name {  
    String value() default "";  
} 

Gander性别注解：

@Target(ElementType.FIELD)  
@Retention(RetentionPolicy.RUNTIME)  
@Documented  
public @interface Gender {  
    public enum GenderType {  
        Male("男"),  
        Female("女"),  
        Other("中性");  
        private String genderStr;  
        private GenderType(String arg0) {  
            this.genderStr = arg0;  
        }  
        @Override  
        public String toString() {  
            return genderStr;  
        }  
    }  
    GenderType gender() default GenderType.Male;  
}  

Profile个人资料注解：

@Target(ElementType.FIELD)  
@Retention(RetentionPolicy.RUNTIME)  
@Documented  
public @interface Profile {  
    public int id() default -1;  
    public int height() default 0;  
    public String nativePlace() default "";  
}  

一个简单的处理器

public class CustomUtils {  
    public static void getInfo(Class<?> clazz) {  
        String name = ""; 
        String gender = ""; 
        String profile = ""; 
        Field fields[] = clazz.getDeclaredFields(); 
        for (Field field : fields) {  
            if (field.isAnnotationPresent(Name.class)) {  
                Name arg0 = field.getAnnotation(Name.class); 
                name = name + arg0.value(); 
                Log.i("Gmw", "name=" + name); 
            }  
            if (field.isAnnotationPresent(Gender.class)) {  
                Gender arg0 = field.getAnnotation(Gender.class); 
                gender = gender + arg0.gender().toString(); 
                Log.i("Gmw", "gender=" + gender); 
            }  
            if (field.isAnnotationPresent(Profile.class)) {  
                Profile arg0 = field.getAnnotation(Profile.class); 
                profile = "[id=" + arg0.id() + ",height=" + arg0.height() + ",nativePlace=" + arg0.nativePlace() + "]"; 
                Log.i("Gmw", "profile=" + profile); 
            }  
        }  
    }  

}  

使用自定义注解：

public class Person {  
    @Name("阿特罗伯斯")  
    private String name;  
    @Gender(gender = Gender.GenderType.Male)  
    private String gender;  
    @Profile(id = 1001, height = 180, nativePlace = "CN")  
    private String profile;  
    public String getName() {  
        return name;  
    }  
    public void setName(String name) {  
        this.name = name;  
    }  
    public String getGender() {  
        return gender;  
    }  
    public void setGender(String gender) {  
        this.gender = gender;  
    }  
    public String getProfile() {  
        return profile;  
    }  
    public void setProfile(String profile) {  
        this.profile = profile;  
    }  
}  

运行：

CustomUtils.getInfo(Person.class); 

结果

I/Gmw: gender=男
I/Gmw: name=阿特罗伯斯
I/Gmw: profile=[id=1001,height=180,nativePlace=CN]

2.若有所思….

3.最后

造神计划。