java - 如何处理fragment上的recyclerview点击事件？

Question

我知道这个问题已经在社区中提出，但我仍然无法解决我的问题。这就是为什么再次发布此内容。如何将数据从 recyclerview 适配器传递到 fragment 。我已成功将数据从适配器传递到 Activity 。但无法了解如何将数据从适配器传递到 fragment 。我的数据库中有两个参数(1)mSliderImage 和(2)mTitle。 mSliderImage 显示在主页 fragment 上。但现在我希望当用户单击 slider 的特定图像时，会打开一个新 fragment 并显示 mTitle。我成功地能够根据图像位置单击图像 slider 来打开新 fragment 。但不知道如何在该 fragment 中传递 mTitle。请有人帮助我完整的代码，因为我必须在 1 月 17 日之前提交这个大学级别的项目。我只发布重要的代码，而不是我的全部代码。我只想要如何将 mSliderTitle 从适配器传递到 fragment 的编码解决方案。当我单击图像 slider 的某些图像时。

下面是我的代码:

在模型中，我已经传递了上面已经提到的 2 个 Getters 和 Setters。 (1) mSliderImage 和 (2) mTitle。

slider 适配器:

public class SliderImageAdapter extends SliderViewAdapter<SliderImageAdapter.SliderAdapterVH>{

    public List<Banner> bannerList;
    public Context context;
    private OnItemClicked onClick;

    public interface OnItemClicked {
        void onItemClick(int position);
    }

    public SliderImageAdapter(Context context, List<Banner> bannerList, OnItemClicked onClick) {

        this.bannerList = bannerList;
        this.context = context;
        this.onClick = onClick;
    }

    @Override
    public SliderAdapterVH onCreateViewHolder(ViewGroup parent) {
        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_slider_myshop, parent, false);
        return new SliderAdapterVH(inflate);
    }

    @Override
    public void onBindViewHolder(final SliderAdapterVH viewHolder, final int position) {

Glide.with(viewHolder.itemView)
                .load(bannerList.get(position).getmSliderImage())
                .into(viewHolder.imageViewBackground);


        viewHolder.itemView.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                onClick.onItemClick(position);
            }
        });
    }

    @Override
    public int getCount() {
        return bannerList.size();
    }

    public int getItemPosition (Object object) {
        return POSITION_NONE;
    }

    public void setOnClick(OnItemClicked onClick) {
        this.onClick = onClick;
    }



    class SliderAdapterVH extends SliderViewAdapter.ViewHolder {
View itemView;
    ImageView imageViewBackground;

    public SliderAdapterVH(View itemView) {
        super(itemView);
        imageViewBackground = itemView.findViewById(R.id.iv_auto_image_slider);
        this.itemView = itemView;

        }
    }

主页 fragment :(此处显示图像 slider 。我希望当用户单击新 fragment 时打开并显示 mTitle)。

public class HomeFragment extends Fragment implements SliderImageAdapter.OnItemClicked {

private SliderImageAdapter sliderImageAdapter;
    private List<Banner> bannerList;

bannerList = new ArrayList<>();
        sliderImageAdapter = new SliderImageAdapter(getActivity(), bannerList, this);

@Override
    public void onItemClick(int position) {

        FragmentManager fm = getFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.add(R.id.fragment_container_dashboard, SliderClickFragment.newInstance());
        ft.addToBackStack(null);
        ft.commit();
    }

slider 点击 fragment XML:

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<TextView
 android:id="@+id/mSliderTitle"
 android:layout_width="match_parent"
 android:layout_height="match_parent"/>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Slider Click Fragment Java:(这里我想在用户单击图像时显示 mTitle)

public class SliderClickFragment extends Fragment {

    public static SliderClickFragment newInstance() {
        Bundle args = new Bundle();
        SliderClickFragment fragment = new SliderClickFragment();
        fragment.setArguments(args);
        return fragment;
    }

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

        return view;
    }
}

Answer 1

试试这个。我还没有测试过，但这个流程应该能达到您想要实现的目标。

HomeFragment.java

public class HomeFragment extends Fragment implements SliderImageAdapter.OnItemClicked {

private SliderImageAdapter sliderImageAdapter;
    private List<Banner> bannerList;

bannerList = new ArrayList<>();
        sliderImageAdapter = new SliderImageAdapter(getActivity(), bannerList, this);

@Override
    public void onItemClick(int position) {

    //GET THE TITLE STRING HERE
    String title = bannerList.get(position).getmSliderTitle();

    FragmentManager fm = getFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();

    //PASS THIS TITLE TO THE FRAGMENT INSTANCE LIKE THIS
    ft.add(R.id.fragment_container_dashboard, SliderClickFragment.newInstance(title));

    ft.addToBackStack(null);
    ft.commit();
}

SliderClickFragment.java

public class SliderClickFragment extends Fragment {

//EDIT the newInstance Method definition to include title like this:
public static SliderClickFragment newInstance(String title) {
    Bundle args = new Bundle();

    //PASS THE STRING IN THE BUNDLE WHICH WILL THEN BE FETCHED IN ONCREATEVIEW LATER LIKE THIS
    args.putString("title", title);

    SliderClickFragment fragment = new SliderClickFragment();
    fragment.setArguments(args);
    return fragment;
}

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

    //GET THE STRING HERE AND THEN USE IT HOWEVER YOU LIKE
    String title = getArguments().getString("title");

    return view;
}

}