RecyclerView with DataBinding
suggest changeHere is a generic ViewHolder class that you can use with any DataBinding layout. Here an instance of particular ViewDataBinding
class is created using the inflated View
object and DataBindingUtil
utility class.
import android.databinding.DataBindingUtil;
import android.support.v7.widget.RecyclerView;
import android.view.View;
public class BindingViewHolder<T> extends RecyclerView.ViewHolder{
private final T binding;
public BindingViewHolder(View itemView) {
super(itemView);
binding = (T)DataBindingUtil.bind(itemView);
}
public T getBinding() {
return binding;
}
}
After creating this class you can use the <layout>
in your layout file to enable databinding for that layout like this:
file name: my_item.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="item"
type="ItemModel" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{item.itemLabel}" />
</LinearLayout>
</layout>
and here is your sample dataModel:
public class ItemModel {
public String itemLabel;
}
By default, Android Data Binding library generates a ViewDataBinding
class based on the layout file name, converting it to Pascal case and suffixing “Binding” to it. For this example it would be MyItemBinding
for the layout file my_item.xml
. That Binding class would also have a setter method to set the object defined as data in the layout file(ItemModel
for this example).
Now that we have all the pieces we can implement our adapter like this:
class MyAdapter extends RecyclerView.Adapter<BindingViewHolder<MyItemBinding>>{
ArrayList<ItemModel> items = new ArrayList<>();
public MyAdapter(ArrayList<ItemModel> items) {
this.items = items;
}
@Override public BindingViewHolder<MyItemBinding> onCreateViewHolder(ViewGroup parent, int viewType) {
return new BindingViewHolder<>(LayoutInflater.from(parent.getContext()).inflate(R.layout.my_item, parent, false));
}
@Override public void onBindViewHolder(BindingViewHolder<ItemModel> holder, int position) {
holder.getBinding().setItemModel(items.get(position));
holder.getBinding().executePendingBindings();
}
@Override public int getItemCount() {
return items.size();
}
}