标签:
dagger 2是android下的IOC框架,类似java服务端的spring,但功能上远没有其强大。个人理解不管是APP还是服务端依赖注入的本质都是一样的,用于解耦某个服务的定义和实现。我自己给出下面这个简单的例子:
1、在android studio中增加配置如下:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath ‘com.android.tools.build:gradle:1.5.0‘,
‘com.neenbedankt.gradle.plugins:android-apt:1.4+‘
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
apply plugin: ‘android-apt‘
//此处要注意dagger的版本号
dependencies {
compile fileTree(dir: ‘libs‘, include: [‘*.jar‘])
testCompile ‘junit:junit:4.12‘
compile ‘com.android.support:appcompat-v7:23.2.0‘
compile ‘com.android.support:design:23.2.0‘
compile ‘com.google.dagger:dagger:2.0‘
apt ‘com.google.dagger:dagger-compiler:2.0‘
provided ‘org.glassfish:javax.annotation:10.0-b28‘
}
2、定义服务的实现如下:
public interface IStoreInfo { void storeInfo(String info); }
public class StoreInfoInDb implements IStoreInfo{ @Override public void storeInfo(String info) { System.out.println("In DB:" + info); } } public class StoreInfoInFile implements IStoreInfo{ @Override public void storeInfo(String info) { System.out.println("In File:" + info); } }
3、定义module和component
@Module public class InfoServiceModule { @Provides @Singleton IStoreInfo setIStoreInfo(){ return new StoreInfoInFile(); } }
@Singleton @Component(modules = InfoServiceModule.class) public interface InfoServiceComponent { void inject(InfoService service); IStoreInfo setIStoreInfo(); }
备注:这里其实相当于spring XML定义的部分,只是这里是采用硬编码的形式绑定接口的定义和实现
4、使用:
public class InfoService { @Inject public IStoreInfo info; public void initService(){ InfoServiceComponent component = DaggerInfoServiceComponent.builder().infoServiceModule(new InfoServiceModule()).build(); component.inject(this); } public void infoHandler(String input){ info.storeInfo(input); } }
标签:
原文地址:http://www.cnblogs.com/Fredric-2013/p/5379073.html