Android 匕首2继承活动和碎片

我在我的应用程序中使用了dagger 2，我得到了这个错误

我有基本活动：

public abstract class QuestionBaseActivity extends DaggerAppCompatActivity implements View.OnClickListener {

protected QuestionViewPager questionsViewPager;
protected TabLayout questionTabs;
protected ProgressBar progressBar;
protected TextView questionNumber;
protected FloatingActionButton nextButton;
protected long testTime;
protected Chronometer chronometer;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
}

public class QuestionControlActivity extends QuestionBaseActivity implements View.OnClickListener, QuestionControlFragment.OnQuestionListener, ControlDialogFragment.OnControlDialogFragmentListener {

private QuestionControlViewModel viewModel;
private FloatingActionButton finishButton;
private Theme currentTheme;
private int correctAnswerCount = 0;

@Inject
ViewModelProviderFactory providerFactory;

@Inject
QuestionControlAdapter questionAdapter;

@Inject
ControlDialogFragment controlDialogFragment;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
}

public class QuestionControlFragment extends QuestionBaseFragment implements View.OnClickListener, OptionViewHolder.OnOptionListener {

@Inject
QuestionControlActivity questionActivity;

public static QuestionControlFragment newInstance(int position) {
    QuestionControlFragment fragment = new QuestionControlFragment();
    Bundle args = new Bundle();
    args.putInt("position", position);
    fragment.setArguments(args);
    return fragment;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    AndroidSupportInjection.inject(this);
    super.onViewCreated(view, savedInstanceState);
}

儿童活动：

public abstract class QuestionBaseActivity extends DaggerAppCompatActivity implements View.OnClickListener {

protected QuestionViewPager questionsViewPager;
protected TabLayout questionTabs;
protected ProgressBar progressBar;
protected TextView questionNumber;
protected FloatingActionButton nextButton;
protected long testTime;
protected Chronometer chronometer;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
}

public class QuestionControlActivity extends QuestionBaseActivity implements View.OnClickListener, QuestionControlFragment.OnQuestionListener, ControlDialogFragment.OnControlDialogFragmentListener {

private QuestionControlViewModel viewModel;
private FloatingActionButton finishButton;
private Theme currentTheme;
private int correctAnswerCount = 0;

@Inject
ViewModelProviderFactory providerFactory;

@Inject
QuestionControlAdapter questionAdapter;

@Inject
ControlDialogFragment controlDialogFragment;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
}

public class QuestionControlFragment extends QuestionBaseFragment implements View.OnClickListener, OptionViewHolder.OnOptionListener {

@Inject
QuestionControlActivity questionActivity;

public static QuestionControlFragment newInstance(int position) {
    QuestionControlFragment fragment = new QuestionControlFragment();
    Bundle args = new Bundle();
    args.putInt("position", position);
    fragment.setArguments(args);
    return fragment;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    AndroidSupportInjection.inject(this);
    super.onViewCreated(view, savedInstanceState);
}

此活动包含一个片段

碱基片段：

public class QuestionBaseFragment extends DaggerFragment implements OptionViewHolder.OnOptionListener {

protected View view;
protected TextView questionText;
protected PhotoView questionImage;
protected RecyclerView options;
protected FloatingActionButton submitButton;
protected SingleQuestionViewModel viewModel;
protected int position;
protected Question question;
protected OnQuestionListener questionListener;
protected ProgressBar loadQuestionProgress;
protected Button skipQuestButton;
protected AnswerTask answerTask = new AnswerTask();

@Inject
ViewModelProviderFactory providerFactory;

@Inject
OptionAdapter optionAdapter;

@Inject
CountTimer timer;

@Inject
protected FrontCameraProvider frontCam;


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.fragment_question, container, false);
    position = getArguments().getInt("position");

    return view;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    AndroidSupportInjection.inject(this);
}

需要活动的子片段：

public abstract class QuestionBaseActivity extends DaggerAppCompatActivity implements View.OnClickListener {

protected QuestionViewPager questionsViewPager;
protected TabLayout questionTabs;
protected ProgressBar progressBar;
protected TextView questionNumber;
protected FloatingActionButton nextButton;
protected long testTime;
protected Chronometer chronometer;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
}

public class QuestionControlActivity extends QuestionBaseActivity implements View.OnClickListener, QuestionControlFragment.OnQuestionListener, ControlDialogFragment.OnControlDialogFragmentListener {

private QuestionControlViewModel viewModel;
private FloatingActionButton finishButton;
private Theme currentTheme;
private int correctAnswerCount = 0;

@Inject
ViewModelProviderFactory providerFactory;

@Inject
QuestionControlAdapter questionAdapter;

@Inject
ControlDialogFragment controlDialogFragment;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
}

public class QuestionControlFragment extends QuestionBaseFragment implements View.OnClickListener, OptionViewHolder.OnOptionListener {

@Inject
QuestionControlActivity questionActivity;

public static QuestionControlFragment newInstance(int position) {
    QuestionControlFragment fragment = new QuestionControlFragment();
    Bundle args = new Bundle();
    args.putInt("position", position);
    fragment.setArguments(args);
    return fragment;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    AndroidSupportInjection.inject(this);
    super.onViewCreated(view, savedInstanceState);
}

匕首2。片段生成器模块：

@Module

@QuestionScope
@ContributesAndroidInjector(
      //  modules = {QuestionFragmentBuilderModule.class, QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
        modules = { QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
)
abstract QuestionActivity contributeQuestionActivity();

@QuestionScope
@ContributesAndroidInjector(
        //  modules = {QuestionFragmentBuilderModule.class, QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
        modules = { QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
)
abstract QuestionBaseActivity contributeQuestionBaseActivity();

@QuestionScope
@ContributesAndroidInjector (
      //  modules = {QuestionModule.class, QuestionViewModelsModule.class, ControlQuestionFragmentBuilderModule.class}
        modules = {QuestionModule.class, QuestionViewModelsModule.class, QuestionBaseFragmentBuilderModule.class}
)
abstract QuestionControlActivity contributeQuestionControlActivity();

公共抽象类QuestionBaseFragmentBuilderModule{

@OptionScope
@ContributesAndroidInjector (
        modules = {OptionModule.class}
)
abstract QuestionBaseFragment contributeQuestionBaseFragment();

@OptionScope
@ContributesAndroidInjector (
        modules = {OptionModule.class}
)
abstract QuestionFragment contributeQuestionFragment();

@OptionScope
@ContributesAndroidInjector (
        modules = {OptionModule.class}
)
abstract InteractiveQuestionFragment contributeInteractiveQuestionFragment();

@OptionScope
@ContributesAndroidInjector(
        modules = {OptionModule.class}
)
abstract QuestionControlFragment contributeQuestionControlFragment();
}

活动生成器模块：

@Module

@QuestionScope
@ContributesAndroidInjector(
      //  modules = {QuestionFragmentBuilderModule.class, QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
        modules = { QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
)
abstract QuestionActivity contributeQuestionActivity();

@QuestionScope
@ContributesAndroidInjector(
        //  modules = {QuestionFragmentBuilderModule.class, QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
        modules = { QuestionViewModelsModule.class, QuestionModule.class, QuestionBaseFragmentBuilderModule.class}
)
abstract QuestionBaseActivity contributeQuestionBaseActivity();

@QuestionScope
@ContributesAndroidInjector (
      //  modules = {QuestionModule.class, QuestionViewModelsModule.class, ControlQuestionFragmentBuilderModule.class}
        modules = {QuestionModule.class, QuestionViewModelsModule.class, QuestionBaseFragmentBuilderModule.class}
)
abstract QuestionControlActivity contributeQuestionControlActivity();

生成错误：

error: [Dagger/MissingBinding] com.example.nktest.ui.question.QuestionControlActivity cannot be provided without an @Inject constructor or an @Provides-annotated method. This type supports members injection but cannot be implicitly provided.
A binding with matching key exists in component: com.example.nktest.di.ActivityBuilderModule_ContributeQuestionControlActivity.QuestionControlActivitySubcomponent
com.example.nktest.ui.question.QuestionControlActivity is injected at
com.example.nktest.ui.question.QuestionControlFragment.questionActivity
com.example.nktest.ui.question.QuestionControlFragment is injected at
dagger.android.AndroidInjector.inject(T) [com.example.nktest.di.AppComponent ? com.example.nktest.di.ActivityBuilderModule_ContributeQuestionActivity.QuestionActivitySubcomponent ? com.example.nktest.di.question.QuestionBaseFragmentBuilderModule_ContributeQuestionControlFragment.QuestionControlFragmentSubcomponent]
The following other entry points also depend on it:
dagger.android.AndroidInjector.inject(T) [com.example.nktest.di.AppComponent ? com.example.nktest.di.ActivityBuilderModule_ContributeQuestionBaseActivity.QuestionBaseActivitySubcomponent ? com.example.nktest.di.question.QuestionBaseFragmentBuilderModule_ContributeQuestionControlFragment.QuestionControlFragmentSubcomponent]
dagger.android.AndroidInjector.inject(T) [com.example.nktest.di.AppComponent ? com.example.nktest.di.ActivityBuilderModule_ContributeQuestionControlActivity.QuestionControlActivitySubcomponent ? com.example.nktest.di.question.QuestionBaseFragmentBuilderModule_ContributeQuestionControlFragment.QuestionControlFragmentSubcomponent]

---

如何在体系结构中使用dagger？

您不需要将活动注入片段，因为片段已经有

getActivity（）

和

requireAction（）

方法。您可以使用

onAttach（上下文）

callback，以将对该上下文的引用保留为活动。例如，您是否能够解决此问题？如果可以，请共享答案。根据以下代码实验室，在调用super之后，调用inject in fragment的最佳位置是在onAttach（）方法中。