Android错误：找不到符号类DaggerAppComponent

我的同事根据此开发了一个应用程序，我应该做一些更改

在我的案例中，经过一些更改并删除Google Room库后，我遇到了以下问题：

错误：找不到符号类DaggerApplicationComponent

经过多次重建后仍然无法生成项目

dagger2Version='2.20'

应用程序类

ActivityBuilder类 进口匕首模块； 导入dagger.android.contributesandroid注入器

@Module
public abstract class ActivityBuilder {

    @ContributesAndroidInjector(modules = {
            FeedActivityModule.class,
            BlogFragmentProvider.class,
            OpenSourceFragmentProvider.class})
    abstract FeedActivity bindFeedActivity();

    @ContributesAndroidInjector(modules = LoginActivityModule.class)
    abstract LoginActivity bindLoginActivity();

    // ...

    @ContributesAndroidInjector(modules = SettingsActivityModule.class)
    abstract SettingsActivity bindPageSixActivity();

    @ContributesAndroidInjector(modules = ChoosingModeActivityModule.class)
    abstract ChoosingModeActivity bindChoosingModeActivity();

}

错误日志：

错误：[Dagger/MissingBinding]com.packagename.data.DataManager在没有@Provides注释方法的情况下无法提供

com.packagename.data.DataManager在

com.packagename.ui.feed.FeedActivityModule.provideFeedViewModeldataManager

com.packagename.ui.feed.FeedViewModel在

com.packagename.ui.feed.FeedActivity.mFeedViewModel

com.packagename.ui.feed.FeedActivity在

dagger.android.android注射器.injectT[com.packagename.di.component.AppComponent？com.packagename.di.builder.ActivityBuilder_BindFeedActivity.FeedActivitySubcomponent]

饲料活性模块

FeedViewModel

---

问题是您尚未注入DataManager类，因此需要通过构造函数注入注入DataManager，或者必须在AppComponent中提供@Provides注释，并且在活动扩展AppActivity时，应使用AndroidSupportInjectionModule.class代替AndroidInjectionModule.class然后使用雄激素支持注射

@Component(modules = {AndroidSupportInjectionModule.class, AppModule.class, ActivityBuilder.class})
public interface AppComponent {

    void inject(AppApplication networkApplication);

    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(AppApplication application);

        AppComponent build();
    }

}

---

你必须检查日志中的错误，然后才能解决。一定是有错误。我在日志中添加了一些详细信息。FeedActivityModule你能发布这个类吗，最后，问题是你没有注入DataManager类，所以你需要通过构造函数注入来注入DataManager，或者你必须在AppComponent中用@Provides注释来提供DataManager，希望这能奏效

import javax.inject.Singleton;

import dagger.BindsInstance;
import dagger.Component;
import dagger.android.AndroidInjectionModule;

@Singleton
@Component(modules = {AndroidSupportInjectionModule.class, AppModule.class, ActivityBuilder.class})
public interface AppComponent {

    void inject(MvvmApp app);

    @Component.Builder
    interface Builder {

        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }
}

@Module
public abstract class ActivityBuilder {

    @ContributesAndroidInjector(modules = {
            FeedActivityModule.class,
            BlogFragmentProvider.class,
            OpenSourceFragmentProvider.class})
    abstract FeedActivity bindFeedActivity();

    @ContributesAndroidInjector(modules = LoginActivityModule.class)
    abstract LoginActivity bindLoginActivity();

    // ...

    @ContributesAndroidInjector(modules = SettingsActivityModule.class)
    abstract SettingsActivity bindPageSixActivity();

    @ContributesAndroidInjector(modules = ChoosingModeActivityModule.class)
    abstract ChoosingModeActivity bindChoosingModeActivity();

}

import dagger.Module;
import dagger.Provides;

@Module
public class FeedActivityModule {

    @Provides
    FeedPagerAdapter provideFeedPagerAdapter(FeedActivity activity) {
        return new FeedPagerAdapter(activity.getSupportFragmentManager());
    }

    @Provides
    FeedViewModel provideFeedViewModel(DataManager dataManager, SchedulerProvider schedulerProvider) {
        return new FeedViewModel(dataManager, schedulerProvider);
    }
}

public class FeedViewModel extends BaseViewModel/*<FeedNavigator>*/ {

    public FeedViewModel(DataManager dataManager, SchedulerProvider schedulerProvider) {
        super(dataManager, schedulerProvider);
    }
}

@Component(modules = {AndroidSupportInjectionModule.class, AppModule.class, ActivityBuilder.class})
public interface AppComponent {

    void inject(AppApplication networkApplication);

    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(AppApplication application);

        AppComponent build();
    }

}