使用RecyclerView创建动态列表:

当我们创建一个RecyclerView时。适配器我们必须指定ViewHolder,它将绑定到适配器。

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    private String[] mDataset;

    public MyAdapter(String[] myDataset) {
        mDataset = myDataset;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;
        public ViewHolder(TextView v) {
            super(v);
            mTextView = v;
        }
    }

    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.some_layout, parent, false);

        //findViewById...

        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.mTextView.setText(mDataset[position]);
    }

    @Override
    public int getItemCount() {
        return mDataset.length;
    }
}

有可能创建多个视图类型的RecyclerView吗?


当前回答

如果有人有兴趣看看用Kotlin编写的超级简单的解决方案,请查看我刚刚创建的博客文章。博客中的例子是基于创建Sectioned RecyclerView的:

https://brona.blog/2020/06/sectioned-recyclerview-in-three-steps/

其他回答

如果视图类型的布局很少,而且绑定逻辑很简单,那么请遵循Anton的解决方案。但是,如果需要管理复杂的布局和绑定逻辑,代码就会很混乱。

我相信下面的解决方案对于需要处理复杂视图类型的人是有用的。

基本DataBinder类

abstract public class DataBinder<T extends RecyclerView.ViewHolder> {

    private DataBindAdapter mDataBindAdapter;

    public DataBinder(DataBindAdapter dataBindAdapter) {
        mDataBindAdapter = dataBindAdapter;
    }

    abstract public T newViewHolder(ViewGroup parent);

    abstract public void bindViewHolder(T holder, int position);

    abstract public int getItemCount();

......

}

在这个类中需要定义的函数与创建单一视图类型时的适配器类几乎相同。

对于每个视图类型,通过扩展这个DataBinder来创建类。

样例DataBinder类

public class Sample1Binder extends DataBinder<Sample1Binder.ViewHolder> {

    private List<String> mDataSet = new ArrayList();

    public Sample1Binder(DataBindAdapter dataBindAdapter) {
        super(dataBindAdapter);
    }

    @Override
    public ViewHolder newViewHolder(ViewGroup parent) {
        View view = LayoutInflater.from(parent.getContext()).inflate(
            R.layout.layout_sample1, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void bindViewHolder(ViewHolder holder, int position) {
        String title = mDataSet.get(position);
        holder.mTitleText.setText(title);
    }

    @Override
    public int getItemCount() {
        return mDataSet.size();
    }

    public void setDataSet(List<String> dataSet) {
        mDataSet.addAll(dataSet);
    }

    static class ViewHolder extends RecyclerView.ViewHolder {

        TextView mTitleText;

        public ViewHolder(View view) {
            super(view);
            mTitleText = (TextView) view.findViewById(R.id.title_type1);
        }
    }
}

为了管理DataBinder类,需要创建一个适配器类。

基DataBindAdapter类

abstract public class DataBindAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return getDataBinder(viewType).newViewHolder(parent);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
        int binderPosition = getBinderPosition(position);
        getDataBinder(viewHolder.getItemViewType()).bindViewHolder(viewHolder, binderPosition);
    }

    @Override
    public abstract int getItemCount();

    @Override
    public abstract int getItemViewType(int position);

    public abstract <T extends DataBinder> T getDataBinder(int viewType);

    public abstract int getPosition(DataBinder binder, int binderPosition);

    public abstract int getBinderPosition(int position);

......

}

通过扩展这个基类来创建类,然后实例化DataBinder类并覆盖抽象方法

getItemCount 返回DataBinders的项目总数 getItemViewType 定义适配器位置和视图类型之间的映射逻辑。 getDataBinder 根据视图类型返回DataBinder实例 getPosition 定义从指定DataBinder中的位置到适配器位置的转换逻辑 getBinderPosition 定义从适配器位置到DataBinder中的位置的转换逻辑

我在GitHub上留下了更详细的解决方案和示例,所以如果你需要,请参考RecyclerView-MultipleViewTypeAdapter。

如果有人有兴趣看看用Kotlin编写的超级简单的解决方案,请查看我刚刚创建的博客文章。博客中的例子是基于创建Sectioned RecyclerView的:

https://brona.blog/2020/06/sectioned-recyclerview-in-three-steps/

实际上,我想改进一下安东的回答。

由于getItemViewType(int position)返回一个整数值,您可以返回需要膨胀的布局资源ID。这样你就可以在onCreateViewHolder(ViewGroup parent, int viewType)方法中保存一些逻辑。

此外,我不建议在getItemCount()中进行密集的计算,因为在呈现列表时,以及在呈现可见项之外的每个项时,该特定函数至少被调用了5次。遗憾的是,由于notifyDatasetChanged()方法是final方法,所以不能重写它,但是可以从适配器中的另一个函数调用它。

你可以使用这个图书馆:https://github.com/vivchar/RendererRecyclerViewAdapter

mRecyclerViewAdapter = new RendererRecyclerViewAdapter(); /* Included from library */
mRecyclerViewAdapter.registerRenderer(new SomeViewRenderer(SomeModel.TYPE, this));
mRecyclerViewAdapter.registerRenderer(...); /* You can use several types of cells */

对于每一个项目,你应该实现一个ViewRenderer, ViewHolder, SomeModel:

ViewHolder -它是回收器视图的一个简单视图持有者。

SomeModel -它是你的模型与ItemModel接口

public class SomeViewRenderer extends ViewRenderer<SomeModel, SomeViewHolder> {

    public SomeViewRenderer(final int type, final Context context) {
        super(type, context);
    }

    @Override
    public void bindView(@NonNull final SomeModel model, @NonNull final SomeViewHolder holder) {
        holder.mTitle.setText(model.getTitle());
    }

    @NonNull
    @Override
    public SomeViewHolder createViewHolder(@Nullable final ViewGroup parent) {
        return new SomeViewHolder(LayoutInflater.from(getContext()).inflate(R.layout.some_item, parent, false));
    }
}

有关更多详细信息,您可以查看文档。

您可以通过使getItemViewType()返回该位置的预期viewType值来处理multipleViewTypes RecyclerAdapter。

我准备了一个MultipleViewTypeAdapter用于构造一个MCQ列表的考试,它可能抛出一个可能有两个或多个有效答案(复选框选项)和一个单一答案问题(单选按钮选项)的问题。

为此,我从API响应中获得问题的类型,并使用它来决定我必须为该问题显示哪个视图。

public class MultiViewTypeAdapter extends RecyclerView.Adapter {

    Context mContext;
    ArrayList<Question> dataSet;
    ArrayList<String> questions;
    private Object radiobuttontype1;


    //Viewholder to display Questions with checkboxes
    public static class Checkboxtype2 extends RecyclerView.ViewHolder {
        ImageView imgclockcheck;
        CheckBox checkbox;

        public Checkboxtype2(@NonNull View itemView) {
            super(itemView);
            imgclockcheck = (ImageView) itemView.findViewById(R.id.clockout_cbox_image);
            checkbox = (CheckBox) itemView.findViewById(R.id.clockout_cbox);
        }
    }

    //Viewholder to display Questions with radiobuttons

    public static class Radiobuttontype1 extends RecyclerView.ViewHolder {
        ImageView clockout_imageradiobutton;
        RadioButton clockout_radiobutton;
        TextView sample;

        public radiobuttontype1(View itemView) {
            super(itemView);
            clockout_imageradiobutton = (ImageView) itemView.findViewById(R.id.clockout_imageradiobutton);
            clockout_radiobutton = (RadioButton) itemView.findViewById(R.id.clockout_radiobutton);
            sample = (TextView) itemView.findViewById(R.id.sample);
        }
    }

    public MultiViewTypeAdapter(ArrayList<QueDatum> data, Context context) {
        this.dataSet = data;
        this.mContext = context;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
        if (viewType.equalsIgnoreCase("1")) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
            return new radiobuttontype1(view);

        } else if (viewType.equalsIgnoreCase("2")) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_cbox_list_row, viewGroup, false);
            view.setHorizontalFadingEdgeEnabled(true);
            return new Checkboxtype2(view);

        } else if (viewType.equalsIgnoreCase("3")) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
            return new Radiobuttontype1(view);

        } else if (viewType.equalsIgnoreCase("4")) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
            return new Radiobuttontype1(view);

        } else if (viewType.equalsIgnoreCase("5")) {
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
            return new Radiobuttontype1(view);
        }

        return null;
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int viewType) {
        if (viewType.equalsIgnoreCase("1")) {
            options =  dataSet.get(i).getOptions();
            question = dataSet.get(i).getQuestion();
            image = options.get(i).getValue();
            ((radiobuttontype1) viewHolder).clockout_radiobutton.setChecked(false);
            ((radiobuttontype1) viewHolder).sample.setText(question);
            //Loading image bitmap in the ViewHolder's View
            Picasso.with(mContext)
                    .load(image)
                    .into(((radiobuttontype1) viewHolder).clockout_imageradiobutton);

        } else if (viewType.equalsIgnoreCase("2")) {
            options = (ArrayList<Clockout_questions_Option>) dataSet.get(i).getOptions();
            question = dataSet.get(i).getQuestion();
            image = options.get(i).getValue();
            //Loading image bitmap in the ViewHolder's View
            Picasso.with(mContext)
                    .load(image)
                    .into(((Checkboxtype2) viewHolder).imgclockcheck);

        } else if (viewType.equalsIgnoreCase("3")) {
            //Fit data to viewHolder for ViewType 3
        } else if (viewType.equalsIgnoreCase("4")) {
            //Fit data to viewHolder for ViewType 4
        } else if (viewType.equalsIgnoreCase("5")) {
            //Fit data to viewHolder for ViewType 5
        }
    }

    @Override
    public int getItemCount() {
        return dataSet.size();
    }

    /**
     * Returns viewType for that position by picking the viewType value from the
     *     dataset
     */
    @Override
    public int getItemViewType(int position) {
        return dataSet.get(position).getViewType();
    }
}

你可以避免在onBindViewHolder()中基于多个条件的viewHolder数据填充,通过为不同位置的viewHolder中相似的视图分配相同的id。