Android注解学习(2)

最近考试周没什么时间写,回归正题。前面的一次简单的讲了关于注解的的基础部分,这一次分析xutils注解封装的源码(奉上github源码)。

补充下:xUtils 2.x对Android 6.0兼容不是很好, 请尽快升级至xUtils3。(如网络部分:android 6.0(api 23) SDK,不再提供org.apache.http.*(只保留几个类))

(1) 注解模块目录结构

Android注解学习(2)Android注解学习(2)Android注解学习(2)

 (2) 分析源代码

  1.元注解--annoation文件夹下三个注解

ContentView:对于activity设置布局文件

/*
* Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ package org.xutils.view.annotation; import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target; @Target(ElementType.TYPE)//使用范围--类,接口,枚举,Annotation类型
@Retention(RetentionPolicy.RUNTIME)//有效范围--运行时有效
public @interface ContentView {
int value();//布局资源
}

Event:

package org.xutils.view.annotation;

import android.view.View;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target; /**
* 事件注解.
* 被注解的方法必须具备一下形式:
* 1. private 修饰
* 2. 返回值类型没有要求
* 3. 方法名以Click或Event结尾, 否则可能被混淆编译时删除. (方法签名形式为void *(android.view.View)也可以)
* 4. 参数签名和type的接口要求的参数签名一致.
* Author: wyouflf
* Date: 13-9-9
* Time: 下午12:43
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Event { /**
* 控件的id集合, id小于1时不执行ui事件绑定.
*
* @return
*/
int[] value(); /**
* 控件的parent控件的id集合, 组合为(value[i], parentId[i] or 0).
*
* @return
*/
int[] parentId() default 0; /**
* 事件的listener, 默认为点击事件.
*
* @return
*/
Class<?> type() default View.OnClickListener.class; /**
* 事件的setter方法名, 默认为set+type#simpleName.
*
* @return
*/
String setter() default ""; /**
* 如果type的接口类型提供多个方法, 需要使用此参数指定方法名.
*
* @return
*/
String method() default "";
}

ViewInject:绑定控件id

/*
* Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ package org.xutils.view.annotation; import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target; @Target(ElementType.FIELD)//字段
@Retention(RetentionPolicy.RUNTIME)//运行时有效
public @interface ViewInject { int value();//绑定控件id /* parent view id */
int parentId() default 0;//绑定控件父布局id 默认是取0
}

2.View文件夹下4个类

ViewInfo--1.控件注解生成ViewInfo;
2.对于散列集合包括HashSet、HashMap以及HashTable通过先比较hashcode相等再比较equals来提高效率
package org.xutils.view;

/**
* 比较两个ViewInfo是否相等
* Author: wyouflf
* Date: 13-12-5
* Time: 下午11:25
*/
/*package*/ final class ViewInfo {
public Object value;
public int parentId; @Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof ViewInfo)) return false; ViewInfo that = (ViewInfo) o; if (parentId != that.parentId) return false;
if (value == null) return (null == that.value); return value.equals(that.value);
} @Override
public int hashCode() {
int result = value.hashCode();
result = 31 * result + parentId;
return result;
}
}

 ViewInjector--定义注解绑定的接口不再详细贴了

 ViewInjectorImpl(重点)--实现注解绑定接口的实现类(包括控件绑定,布局资源绑定,控件的事件绑定)

 使用单例模式双重检查锁定创建ViewInjectorImpl对象并保证线程安全

 简单的做了ViewInjectorImpl类的分析:Android注解学习(2)

错误之处还请指出-_-。。。

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