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Composed View Holder with decoupled OnClickListener
package com.example.ui.utils;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
import static com.example.util.Preconditions.checkPositionIndex;
public abstract class ModelAdapter<Model, VH extends ModelViewHolder<Model>>
extends RecyclerView.Adapter<VH> {
private List<Model> data = new ArrayList<>();
private final int layoutId;
private Context context;
protected OnItemClickListener<Model> clickListener;
public interface OnItemClickListener<Model> {
void onItemClick(View view, int position, Model model);
}
public ModelAdapter(int layoutId) {
this.layoutId = layoutId;
}
protected abstract VH createViewHolder(View view);
@Override
public VH onCreateViewHolder(final ViewGroup parent, final int viewType) {
final View view = LayoutInflater
.from(parent.getContext())
.inflate(layoutId, parent, false);
context = parent.getContext();
VH holder = createViewHolder(view);
holder.setOnItemClickListener(clickListener);
return holder;
}
@Override
public int getItemCount() {
return data.size();
}
@Override
public void onBindViewHolder(VH holder, final int position) {
checkPositionIndex(position, data.size());
Model model = data.get(position);
holder.setModel(model);
}
public void setData(List<Model> data) {
this.data = data;
notifyDataSetChanged();
}
public void setOnItemClickListener(OnItemClickListener<Model> listener) {
this.clickListener = listener;
}
protected Context getContext() {
return this.context;
}
}
package com.example.ui.utils;
import android.support.v7.widget.RecyclerView;
import android.view.View;
public abstract class ModelViewHolder<Model> extends RecyclerView.ViewHolder
implements View.OnClickListener {
private ModelAdapter.OnItemClickListener<Model> clickListener;
private Model model;
public ModelViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
}
void setModel(Model model) {
this.model = model;
bindModel(model);
}
protected abstract void bindModel(Model model);
public void onClick(View view) {
if (clickListener != null) {
clickListener.onItemClick(view, getAdapterPosition(), model);
}
}
void setOnItemClickListener(ModelAdapter.OnItemClickListener listener) {
this.clickListener = listener;
}
}
// This class is generated. Do not modify!
package com.example.data.api.model;
import com.google.gson.annotations.SerializedName;
public final class Test {
@SerializedName("title")
public final String title;
@SerializedName("subtitle")
public final String subtitle;
public Test(
String title,
String subtitle,
) {
this.title = title;
this.subtitle = subtitle;
}
}
package com.example.ui.test;
import android.view.View;
import android.widget.TextView;
import com.example.R;
import com.example.data.api.model.Test;
import com.example.ui.utils.ModelViewHolder;
import com.example.ui.utils.ModelAdapter;
import butterknife.Bind;
import butterknife.ButterKnife;
public class TestAdapter extends ModelAdapter<Test, TestAdapter.TestViewHolder>{
public TestAdapter() {
super(R.layout.test_item);
}
@Override
protected TestViewHolder createViewHolder(View view) {
return new TestViewHolder(view);
}
public static class TestViewHolder extends ModelViewHolder<Test> {
@Bind(R.id.text1)
TextView text1;
@Bind(R.id.text2)
TextView text2;
public TestViewHolder(final View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
@Override
protected void bindModel(Test test) {
text1.setText(test.title);
text2.setText(test.subtitle);
}
}
}
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