为EventBus添加注解处理器

来源：互联网发布：微商城数据统计编辑：程序博客网时间：2024/06/10 01:07

EventBus同时支持编译时注解和运行时注解, 当没配置编译时注解处理器时, 会自动通过反射查找运行时的注解, 这将有轻微的性能损失. 可以添加注解处理器, 让其支持编译时注解.

build.gradle(Project)中添加 classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’

buildscript {    repositories {        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.2.3'        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'    }}

app/build.gradle(Module)的配置

添加 apply plugin: 'com.neenbedankt.android-apt'......android {    compileSdkVersion 23    buildToolsVersion "23.0.3"......    apt {        arguments {        //生成java文件路径, 比如            eventBusIndex "com.maimiho.config.EventBusIndex"        }    }......}dependencies {    compile 'org.greenrobot:eventbus:3.0.0'    apt 'org.greenrobot:eventbus-annotation-processor:3.0.1'}

然后正常的使用EventBus, 最终编译出的Apk中就能找到生成的文件EventBusIndex.class

如下:

package com.maimiho.config;import com.maimiho.EventBusActivity;import com.maimiho.entity.Entry;import java.util.HashMap;import java.util.Map;import org.greenrobot.eventbus.ThreadMode;import org.greenrobot.eventbus.meta.SimpleSubscriberInfo;import org.greenrobot.eventbus.meta.SubscriberInfo;import org.greenrobot.eventbus.meta.SubscriberInfoIndex;import org.greenrobot.eventbus.meta.SubscriberMethodInfo;public class EventBusIndex  implements SubscriberInfoIndex{  private static final Map<Class<?>, SubscriberInfo> SUBSCRIBER_INDEX = new HashMap();  static  {    putIndex(new SimpleSubscriberInfo(EventBusActivity.class, true, new SubscriberMethodInfo[] { new SubscriberMethodInfo("onEvent", Entry.class, ThreadMode.MAIN) }));  }  private static void putIndex(SubscriberInfo paramSubscriberInfo)  {    SUBSCRIBER_INDEX.put(paramSubscriberInfo.getSubscriberClass(), paramSubscriberInfo);  }  public SubscriberInfo getSubscriberInfo(Class<?> paramClass)  {    paramClass = (SubscriberInfo)SUBSCRIBER_INDEX.get(paramClass);    if (paramClass != null) {      return paramClass;    }    return null;  }}

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