Dagger 2 Basics

Dagger 2 is the IOC framework under Android, similar to the Java server's spring, but functionally far from its power. Personal Understanding the essence of both app and server-dependent injection is the same, used to decouple the definition and implementation of a service. Let me give you the following simple example:

1. Add the following configuration in Android Studio:

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 '
///Note Here Dagger version number 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, the implementation of the definition of services are as follows:

 Public Interface istoreinfo {    void  storeinfo (String info);}

 Public class Implements istoreinfo{    @Override    publicvoid  storeinfo (String info) {        System.out.println ("in DB:" + info);}    }  Public class Implements istoreinfo{    @Override    publicvoid  storeinfo (String info) {        System.out.println ("in File:" + info);}    }

3. Define module and component

@Module  Public class infoservicemodule {    @Provides    @Singleton    istoreinfo setistoreinfo () {        return New storeinfoinfile ();    }}

= Infoservicemodule. class )publicinterface  infoservicecomponent {    void  Inject (infoservice service);    Istoreinfo setistoreinfo ();}

Note: This is actually equivalent to the part of the spring XML definition, but here is the definition and implementation of a hard-coded form binding interface

4. Use:

 Public class Infoservice {    @Inject    public  istoreinfo info;      Public void Initservice () {        = Daggerinfoservicecomponent.builder (). Infoservicemodule (new  Infoservicemodule ()). build ();        Component.inject (this);    }      Public void Infohandler (String input) {        info.storeinfo (input);}    }

Dagger 2 Basics