public class RecyclerViewHolder extends RecyclerView.ViewHolder {
private SparseArrayarrayView;
public RecyclerViewHolder(View itemView) {
super(itemView);
arrayView =new SparseArray<>();
}
/**
* 通过填写的itemId来获取具体的View的对象
* @param itemId R.id.***
* @param <T> 必须是View的子类
* @return
*/
public T getView(int itemId){
//arrayVie类似于Map容器，get(key)取出的是value值
View mView =arrayView.get(itemId);
if(mView ==null){
//实例化具体的View类型
mView =itemView.findViewById(itemId);
arrayView.put(itemId,mView);
}
return (T) mView;
}
}
新建BaseRecyclerAdapter 所有的Recycler 使用的Adapter 都继承于这个
public abstract class BaseRecyclerAdapter<T> extends RecyclerView.Adapter<RecyclerViewHolder> {
private List<T> mDatas;
private Context mContext;
private LayoutInflater mInflater;
private OnItemClickListener mOnItemClickListener;
public BaseRecyclerAdapter(Context context) {
this.mContext = context;
mInflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = mInflater.inflate(getLayoutId(), parent, false);
return new RecyclerViewHolder(view);
}
@Override
public void onBindViewHolder(RecyclerViewHolder holder, final int position) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) mOnItemClickListener.onItemClick(position);
}
});
bindView(holder, position);
}
abstract public void bindView(RecyclerViewHolder holder, final int position);
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
mOnItemClickListener = onItemClickListener;
}
@LayoutRes
abstract public int getLayoutId();
/**
* 获取上下文对象
*
* @return
*/
public Context getContext() {
return mContext;
}
@Override
public int getItemCount() {
return mDatas == null ? 0 : mDatas.size();
}
/**
* 获取指定item数据
*
* @param position
* @return
*/
public T getItemData(int position) {
return mDatas == null ? null : mDatas.get(position);
}
/**
* 获取数据集合
*
* @return
*/
public List<T> getData() {
return mDatas;
}
/**
* 设置数据集合
*
* @param datas
*/
public void setData(List<T> datas) {
this.mDatas = datas;
}
/**
* 移除指定item的数据
*
* @param position
*/
public void removeData(int position) {
this.mDatas.remove(position);
}
public interface OnItemClickListener {
void onItemClick(int position);
}
}
用法：
public class MyAdapter extends BaseRecyclerAdapter {
public MyAdapter (Context context) {
super(context);
}
@Override
public void bindView(RecyclerViewHolder holder, int position) {
TextView tvName = holder.getView(R.id.tv_name);
}
@Override
public int getLayoutId() {
return R.layout.item;
}
}
