Android recyclerView数据绑定适配器数据

Question

我正在使用Android Data Binding实现Recycler View及其相应的adapter 。 问题是在我所见过的所有教程中，它们都使用View model类的Collection来初始化适配器的数据，如下所示：

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> implements View.OnClickListener {

private ArrayList<ViewModel> items;

public RecyclerViewAdapter(ArrayList<ViewModel> items) {
    this.items = items;
}

.....
}

但是我要传递到“ Recycler View的records是database中records的Collection ：

private ArrayList<Record> items;

我怎样才能做到这一点？？

提前致谢！

编辑

li_item.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

<data>
    <variable
        name="report"
        type="viewmodel.ReportVM"/>
</data>

....

<TextView
        android:id="@+id/tv_report_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:textSize="18sp"
        android:paddingBottom="6dp"
        android:text="@{report.name}"
        tools:text="Report 1"
        />

....

适配器

    public class ReportRVAdapter extends RecyclerView.Adapter<ReportRVAdapter.ReportViewHolder> {

private List<ReportDb> data;


public ReportRVAdapter(final List<ReportDb> reportData) {
    this.data = reportData;
}

@Override
public ReportRVAdapter.ReportViewHolder onCreateViewHolder(final ViewGroup parent, final int viewType) {
    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.li_item, parent, false);
    return new ReportViewHolder(v);
}

@Override
public void onBindViewHolder(final ReportViewHolder holder, final int position) {
    ReportDb item = data.get(position);

    holder.getBinding().setVariable(BR.name, item.getName());
    holder.getBinding().setVariable(BR.contractor, item.getContractor());

    //make binding happen immediately
    holder.getBinding().executePendingBindings();
}

@Override
public int getItemCount() {
    return data == null ? 0 : data.size();
}


public class ReportViewHolder extends RecyclerView.ViewHolder {
    private ViewDataBinding binding;

    public ReportViewHolder(final View rowView) {
        super(rowView);

        binding = DataBindingUtil.bind(rowView);
    }

    public ViewDataBinding getBinding() {
        return binding;
    }
}
}

模型图

public class ReportVM extends BaseObservable {

public String name;
public String contractor;

public ReportVM() {
}

@Bindable
public String getName() {
    return name;
}

public void setName(final String name) {
    this.name = name;
}

@Bindable
public String getContractor() {
    return contractor;
}

public void setContractor(final String contractor) {
    this.contractor = contractor;
}
}

Answer 1

您可以在RecyclerView中使用任何集合，这取决于您如何将值与View（TextView，ImageView）绑定。 例：-

@Override
    public void onBindViewHolder(ViewHolder holder, int position) {
            // - get element from your dataset at this position
            // - replace the contents of the view with that element
            final String name = mDataset.get(position);
            holder.txtHeader.setText(mDataset.get(position));
}

在上面的示例中，这取决于您，如果您使用Map，则需要使用键来获取价值。 对于设置，可以使用相同的get方法。

Answer 2

最终我意识到了，而不是：

holder.getBinding().setVariable(BR.name, item.getName());
holder.getBinding().setVariable(BR.contractor, item.getContractor());

//make binding happen immediately
holder.getBinding().executePendingBindings();

我应该这样写：

holder.getBinding().setReport(new ReportVM(item));

和我的POJO：

private ReportDb report;

public ReportVM(final ReportDb report) {
    this.report = report;
}

public String getName() {
    return report.getName();
}

public String getContractor() {
    return report.getContractor();
}