@OnClick(R.id.btn1)
public void onViewClicked() {
Toast.makeText(this, student.toString(), Toast.LENGTH_SHORT).show();
}
}
2、源码解析
======
打开目录结构：
我们不难发现，编译器已经帮我们生成了这样几个文件：
-
Student_Factory
-
DaggerTest1Component
-
Test1Activity_MembersInjector
-
Test1Activity_ViewBinding（不用管，butterknife）
我们一一进行分析：
2.1、Student_Factory
上一篇文章我们已经进行了分析，很简单，当我们@Inject注解一个类的构造方法时，编译器会自动帮我们生成一个工厂类，负责生产该类的对象，类似于商品的厂家：
package com.gs.dagtest1.bean;
import dagger.internal.Factory;
public final class Student_Factory implements Factory {
private static final Student_Factory INSTANCE = new Student_Factory();
@Override
public Student get() {
return provideInstance();
}
public static Student provideInstance() {
return new Student();
}
public static Student_Factory create()
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{
return INSTANCE;
}
public static Student newStudent() {
return new Student();
}
}
2.2、DaggerTest1Component
public final class DaggerTest1Component implements Test1Component {
private DaggerTest1Component(Builder builder) {}
public static Builder builder() {
return new Builder();
}
public static Test1Component create() {
return new Builder().build();
}
@Override
public void inject(Test1Activity activity) {
injectTest1Activity(activity);
}
private Test1Activity injectTest1Activity(Test1Activity instance) {
Test1Activity_MembersInjector.injectStudent(instance, new Student());
return instance;
}
public static final class Builder {
private Builder() {}
public Test1Component build() {
return new DaggerTest1Component(this);
}
/**
-
@deprecated This module is declared, but an instance is not used in the component. This
-
method is a no-op. For more, see https://google.github.io/dagger/unused-modules.
*/
@Deprecated
public Builder test1Module(Test1Module test1Module) {
Preconditions.checkNotNull(test1Module);
return this;
}
}
}
2.3、Test1Activity_MembersInjector
public final class Test1Activity_MembersInjector implements MembersInjector {
private final Provider studentProvider;
public Test1Activity_MembersInjector(Provider studentProvider) {
this.studentProvider = studentProvider;
}
public static MembersInjector create(Provider studentProvider) {
return new Test1Activity_MembersInjector(studentProvider);
}
@Override
public void injectMembers(Test1Activity instance) {
injectStudent(instance, studentProvider.get());
}
public static void injectStudent(Test1Activity instance, Student student) {
instance.student = student;
}
}
很熟悉，我们在Activity中就用到了这个生成的类，编译器起名方式也很简洁：Dagger+你的Component接口名。
在我们的Activity中我们是这样使用：
DaggerTest1Component.builder()
// .test1Module(new Test1Module(this))
.build()
.inject(this);
我们根据这个步骤查看源码，发现
DaggerTest1Component.builder().build()
实际上是通过建造者模式创建了一个新的DaggerTest1Component对象而已。
然后通过调用
DaggerTest1Component.java
DaggerTest1Component.builder().build().inject(this);
@Override
public void inject(Test1Activity activity) {
injectTest1Activity(activity);
}
private Test1Activity injectTest1Activity(Test1Activity instance) {
Test1Activity_MembersInjector.injectStudent(instance, new Student());
return instance;
}
Test1Activity_MembersInjector.java
public static void injectStudent(Test1Activity instance, Student student) {
instance.student = student;
}
可以看到这些代码最终是把activity对象和student对象都 传入到了Test1Activity_MembersInjector的injectStudent()方法中。
2.4、Test1Activity_MembersInjector类，将Student和Activity进行连接
public final class Test1Activity_MembersInjector implements MembersInjector {
private final Provider studentProvider;
public Test1Activity_MembersInjector(Provider studentProvider) {
this.studentProvider = studentProvider;
}
public static MembersInjector create(Provider studentProvider) {
return new Test1Activity_MembersInjector(studentProvider);
}
@Override
public void injectMembers(Test1Activity instance) {
injectStudent(instance, studentProvider.get());
}
public static void injectStudent(Test1Activity instance, Student student) {
instance.student = student;
}
}
其实已经很简单了，在该Injector的injectMembers()方法中，已经将Student对象通过Student_Factory的get()方法获得，然后直接赋值给Activity的student对象了！
而create() 方法中传入的参数 Provider 就是Student_Factory工厂类。
public final class Student_Factory implements Factory {