Dagger2之Lazy和Provider(懒加载)-第六章

本文详细探讨了Dagger2中的Lazy和Provider组件,重点讲解它们在实现懒加载策略中的作用。通过使用Lazy和Provider,可以确保依赖项在真正需要时才进行初始化,从而优化应用性能,减少资源消耗。

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    @Inject
    Lazy<User> lazyUser; //注入Lazy元素
    @Inject
    Provider<User> providerUser; //注入Provider元素

    public void init() {
        DaggerComponent.create().inject(this);
        User user1 = lazyUser.get();
        //在这时才创建user1,以后每次调用get会得到同一个user1对象
        User user2 = providerFruit.get();
        //在这时创建user2,以后每次调用get会再强制调用Module的Provides方法一次,根据Provides方法具体实现的不同,可能返回跟user2是同一个对象,也可能不是。
    }

}

06-05 05:19:55.434 8556 8556 D AndroidRuntime: Shutting down VM 06-05 05:19:55.437 8556 8556 E AndroidRuntime: FATAL EXCEPTION: main 06-05 05:19:55.437 8556 8556 E AndroidRuntime: Process: com.avatr.commonservice, PID: 8556 06-05 05:19:55.437 8556 8556 E AndroidRuntime: java.util.ServiceConfigurationError: com.avatr.common.base.modules.BusinessInterface: Provider com.avatr.commonservice.updatecountry.UpdateCountryManager could not be instantiated 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.util.ServiceLoader.fail(ServiceLoader.java:233) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.util.ServiceLoader.-$$Nest$smfail(Unknown Source:0) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:392) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:416) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.util.ServiceLoader$1.next(ServiceLoader.java:494) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at com.avatr.common.base.BusinessImplClassFactory.next(BusinessImplClassFactory.java:41) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at com.avatr.common.base.modules.ModulesManaer.initModule(ModulesManaer.java:37) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at com.avatr.common.base.ComService.onCreate(ComService.java:39) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:4736) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.app.ActivityThread.-$$Nest$mhandleCreateService(Unknown Source:0) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2333) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.os.Looper.loopOnce(Looper.java:218) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.os.Looper.loop(Looper.java:307) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:8309) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:573) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: Caused by: java.lang.IllegalAccessException: void com.avatr.commonservice.updatecountry.UpdateCountryManager.<init>() is not accessible from java.lang.Class<java.util.ServiceLoader$LazyIterator> 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.lang.Class.newInstance(Native Method) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:388) 06-05 05:19:55.437 8556 8556 E AndroidRuntime: ... 15 more
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06-07
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