BaseAdapter.java
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package com.ys.yslibrary.ui.adapter;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.databinding.DataBindingUtil;
import androidx.databinding.ViewDataBinding;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public abstract class BaseAdapter<T> extends RecyclerView.Adapter<BaseAdapter.BaseViewHolder> implements View.OnClickListener {
private Activity context;
private List<T> list;
private LayoutInflater inflate;
public BaseAdapter(Activity context, List<T> list) {
if (context == null) {
throw new NullPointerException("context can't NULL");
}
this.context = context;
this.list = list;
this.inflate = LayoutInflater.from(context);
}
public T getItemData(int pos) {
return list.get(pos);
}
public Activity getContext() {
return context;
}
public List<T> getList() {
return list;
}
@NonNull
@Override
public final BaseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new BaseViewHolder(DataBindingUtil.inflate(inflate, getItemLayoutId(viewType), parent, false));
}
@Override
public final void onBindViewHolder(@NonNull BaseViewHolder holder, int position) {
bindHolder(holder.binding, position, getItemData(position), getItemViewType(position));
}
@Override
public final void onBindViewHolder(@NonNull BaseViewHolder holder, int position, @NonNull List<Object> payloads) {
super.onBindViewHolder(holder, position, payloads);
bindHolder(holder.binding, position, getItemData(position), payloads);
}
@Override
public int getItemCount() {
return list.size();
}
abstract int getItemLayoutId(int viewType);
abstract void bindHolder(ViewDataBinding viewDataBinding, int position, T itemBean, int viewType);
public void bindHolder(ViewDataBinding viewDataBinding, int position, T itemBean, @NonNull List<Object> payloads) {
}
@Override
public void onClick(View v) {
}
public static class BaseViewHolder<B extends ViewDataBinding> extends RecyclerView.ViewHolder {
private final B binding;
public BaseViewHolder(B binding) {
super(binding.getRoot());
this.binding = binding;
}
}
public void clear() {
if (list != null) {
list.clear();
}
notifyDataSetChanged();
}
/**
* 是否是相同的item
*
* @param oldItem
* @param newItem
* @return
*/
public abstract boolean areItemsTheSame(T oldItem, T newItem);
public void replaceData(List<T> newData) {
if (newData == null || newData.isEmpty()) {
return;
}
DiffUtil.DiffResult result = DiffUtil.calculateDiff(new DiffCallBack(list, newData), true);
result.dispatchUpdatesTo(this);
this.list = newData;
}
public void insertData(List<T> newData) {
if (list == null || newData == null || newData.isEmpty()) {
return;
}
int index = list.size();
if (!list.containsAll(newData)) {
list.addAll(newData);
}
if (index != list.size()) {
notifyItemRangeInserted(index, list.size());
}
}
/**
* 是否内容相同
*
* @param oldItem
* @param newItem
* @return
*/
public abstract boolean areContentsTheSame(T oldItem, T newItem);
private class DiffCallBack extends DiffUtil.Callback {
private List<T> oldData;
private List<T> newData;
public DiffCallBack(List<T> oldData, List<T> newData) {
this.oldData = oldData;
this.newData = newData;
}
@Override
public int getOldListSize() {
return oldData != null ? oldData.size() : 0;
}
@Override
public int getNewListSize() {
return newData != null ? newData.size() : 0;
}
@Override
public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
T oldT = oldData.get(oldItemPosition);
T newT = oldData.get(newItemPosition);
// 若此处返回true，则DiffUtil会再调用下面的areContentsTheSame方法，进一步对比UI是否有变化
// 若此处返回false，则说明id都不同，肯定不是一个item
return BaseAdapter.this.areItemsTheSame(oldT, newT);
}
@Override
public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
// TODO 比较新旧数据（主要是UI展示内容）是否相同，这里为了方便示例直接返回true
T oldT = oldData.get(oldItemPosition);
T newT = oldData.get(newItemPosition);
return BaseAdapter.this.areItemsTheSame(oldT, newT);
}
}
}