Question

我想将一些数据从片段父级传递给对话框片段子级。问题是我无法通过bundle传递数据，因为dagger实例化片段对话框，所以bundle总是为null。我正在使用匕首2.12 ..

我是Dagger 2的新手，所以这可能是微不足道的。我仍然试图绕过它。

我按照this教程，并采用它来适应我的应用程序。为了简单起见，我的MainFragment：

public class MainFragment extends BaseFragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        this.setHasOptionsMenu(true);
        return inflater.inflate(R.layout.my_fragment, container, false);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.my_menu, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()) {
            case R.id.action_delete:
                Bundle args = new Bundle();
                args.putString("BUNDLE_TITLE_KEY", getResources().getString(R.string.dialog_delete_name));
                args.putString("BUNDLE_MESSAGE_KEY", getResources().getString(R.string.delete_message));
                addDialogFragment(new ConformationFragmentDialog(), args);
                break;
            default:
                return super.onOptionsItemSelected(item);
        }
        return true;
    }
}

这是BaseFragment（由MainFragment扩展）：

public class BaseFragment extends Fragment implements HasFragmentInjector {

    @Inject
    @Named(BaseFragmentModule.CHILD_FRAGMENT_MANAGER)
    FragmentManager childFragmentManager;

    @Inject
    DispatchingAndroidInjector<Fragment> childFragmentInjector;

    @Override
    public void onAttach(Context context) {
        AndroidInjection.inject(this);
        super.onAttach(context);
    }

    @Override
    public AndroidInjector<Fragment> fragmentInjector() {
        return childFragmentInjector;
    }

    protected final void addDialogFragment(DialogFragment dialogFragment, Bundle bundle) {
        dialogFragment.setArguments(bundle);
        childFragmentManager.beginTransaction().add(dialogFragment, "Hello").commit();
    }
}

这是ConformationFragmentDialog：

public class ConformationFragmentDialog extends DialogFragment {

    @Override
    public void onAttach(Context context) {
        AndroidInjection.inject(this);
        super.onAttach(context);
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
        dialogBuilder.setNegativeButton(R.string.common_odustani, new DialogInterface.OnClickListener() {
            //TODO: set title and message dynamically, bundle is null
        }).setTitle("TITLE").setMessage("MESSAGE");
        return dialogBuilder.create();
    }
}

这是BaseFragmentModule和MainFragmentModule：

@Module
public abstract class BaseFragmentModule {
    public static final String FRAGMENT = "BaseFragmentModule.fragment";
    public static final String CHILD_FRAGMENT_MANAGER = "BaseFragmentModule.ChildFragmentManager";


    @Provides
    @Named(CHILD_FRAGMENT_MANAGER)
    static FragmentManager childFragmentManager(@Named(FRAGMENT) Fragment fragment) {
        return fragment.getChildFragmentManager();
    }
}


@Module(includes = BaseFragmentModule.class, subcomponents = ConformationFragmentDialogSubcomponent.class)
public abstract class MainFragmentModule {

    @Binds
    @IntoMap
    @FragmentKey(ConformationFragmentDialog.class)
    abstract AndroidInjector.Factory<? extends Fragment> conformationFragmentDialog(ConformationFragmentDialogSubcomponent.Builder builder);


    @Binds
    @Named(BaseFragmentModule.FRAGMENT)
    abstract Fragment fragment(UvjetListFragment uvjetListFragment);

}

目前，ConformationFragmentDialogModule为空，子组件是基本子组件。

我希望ConformationFragmentDialog可以在不同的片段中重复使用。如何为我调用ConformationFragmentDialog的每个片段设置不同的标题和消息，同时仍以适当的方式处理匕首？

Answer 1

在ConfirmationFragmentDialog类中使用静态newInstance创建一个片段，如下所示

public class ConformationFragmentDialog extends DialogFragment {
    public static ConformationFragmentDialog newInstance(String title,String msg) {
        ConformationFragmentDialog fragment = new ConformationFragmentDialog();

        // Supply string input as an argument.
        Bundle args = new Bundle();
        args.putString("BUNDLE_TITLE_KEY", title);
        args.putString("BUNDLE_MESSAGE_KEY", msg);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        String title = getArguments.getStrings("BUNDLE_TITLE_KEY");
        String message = getArguments.getStrings("");
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
        dialogBuilder.setNegativeButton(
            R.string.common_odustani, 
            new DialogInterface.OnClickListener() {
                //TODO: set title and message dynamically, bundle is null
            }
        ).setTitle("TITLE").setMessage("MESSAGE");
        return dialogBuilder.create();
    }
}

还可以通过调用newInstance方法返回MainFragment返回片段。

如何在使用dagger 2时将数据传递给子片段

1 个答案: