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標題: 商城開發筆記-10-Adapter的封裝以及使用 [打印本頁]

作者: 51黑bing 時間: 2016-3-22 17:27
標題: 商城開發筆記-10-Adapter的封裝以及使用
一、Adapter的封裝

由于我們的RecycleView在項目中很常用，因此有必要對Adapter進行封裝。

封裝的原則是：

BaseAdapter的代碼如下：

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;

/**

* Adapter的簡單封裝

public abstract class BaseAdapter<T, H extends BaseViewHolder> extends RecyclerView.Adapter<BaseViewHolder> {

protected static final String TAG = BaseAdapter.class.getSimpleName();

protected final Context context;

protected final int layoutResId;

protected List<T> datas;

private OnItemClickListener mOnItemClickListener = null;

public interface OnItemClickListener {

void onItemClick(View view, int position);

}

public BaseAdapter(Context context, int layoutResId) {

this(context, layoutResId, null);

}

public BaseAdapter(Context context, int layoutResId, List<T> datas) {

this.datas = datas == null ? new ArrayList<T>() : datas;

this.context = context;

this.layoutResId = layoutResId;

}

@Override

public BaseViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {

View view = LayoutInflater.from(viewGroup.getContext()).inflate(layoutResId, viewGroup, false);

BaseViewHolder vh = newBaseViewHolder(view, mOnItemClickListener);

return vh;

}

@Override

public void onBindViewHolder(BaseViewHolder holder, int position) {

T item = getItem(position);

convert((H) holder, item);

}

@Override

public int getItemCount() {

if (datas == null || datas.size() <= 0)

return 0;

return datas.size();

}

public T getItem(int position) {

if (position >= datas.size()) return null;

return datas.get(position);

}

/**

* 清空數據

public void clearData() {

int size = datas.size();

datas.clear();

notifyItemRangeRemoved(0, size);

}

/**

* 下拉刷新，清除原有數據，添加新數據

* @param newData

public void refreshData(List<T> newData) {

datas.clear();

datas.addAll(newData);

notifyItemRangeChanged(0, datas.size());

}

/**

* 在原來數據的末尾追加新數據

* @param moreData

public void loadMoreData(List<T> moreData) {

int lastPosition = datas.size();

datas.addAll(lastPosition, moreData);

notifyItemRangeInserted(lastPosition, moreData.size());

}

/**

* Implement this method and use the helperto adapt the view to the given item.

* @param viewHoder A fully initializedhelper.

* @param item The item that needs to be displayed.

protected abstract void convert(H viewHoder, T item);

public void setOnItemClickListener(OnItemClickListener listener) {

this.mOnItemClickListener = listener;

}

BaseViewHolder的代碼如下：

import android.support.v7.widget.RecyclerView;

import android.util.SparseArray;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

/**

* 封裝的ViewHolder

public class BaseViewHolder extendsRecyclerView.ViewHolder implements View.OnClickListener {

//使用數組把條目中的View保存起來

private SparseArray<View> views;

private BaseAdapter.OnItemClickListener mOnItemClickListener;

public BaseViewHolder(ViewitemView, BaseAdapter.OnItemClickListener onItemClickListener) {

super(itemView);

itemView.setOnClickListener(this);

this.mOnItemClickListener = onItemClickListener;

this.views = new SparseArray<View>();

}

public TextView getTextView(int viewId) {

return retrieveView(viewId);

}

public Button getButton(int viewId) {

return retrieveView(viewId);

}

public ImageView getImageView(int viewId) {

return retrieveView(viewId);

}

public View getView(int viewId) {

return retrieveView(viewId);

}

protected <T extends View> T retrieveView(int viewId) {

View view = views.get(viewId);

if (view == null) {

view = itemView.findViewById(viewId);

views.put(viewId, view);

}

return (T) view;

}

@Override

public void onClick(View v) {

if (mOnItemClickListener != null) {

mOnItemClickListener.onItemClick(v, getLayoutPosition());

}

為了使用方便，再提供一個SimpleAdapter：

import android.content.Context;

import java.util.List;

/**

* 一個簡易的adapter

public abstract class SimpleAdapter<T> extends BaseAdapter<T, BaseViewHolder> {

public SimpleAdapter(Context context, int layoutResId) {

super(context, layoutResId);

}

public SimpleAdapter(Contextcontext, int layoutResId, List<T> datas) {

super(context, layoutResId, datas);

}

二、封裝Adapter的基本使用

1、使用

mAdapter = newSimpleAdapter<Page.Ware>(getActivity(), R.layout.item_hot_wares) {

@Override

protected void convert(BaseViewHolder holder, final Page.Ware item) {

SimpleDraweeView s = (SimpleDraweeView) holder.getView(R.id.drawee_view);

s.setImageURI(Uri.parse(item.getImgUrl()));

holder.getTextView(R.id.text_title).setText(item.getName());

holder.getTextView(R.id.text_price).setText(item.getPrice() + "");

holder.getButton(R.id.btn_add).setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Toast.makeText(getActivity(), item.getName(), Toast.LENGTH_SHORT).show();

}

});

}

};

2、還可以進行點擊監聽

mAdapter.setOnItemClickListener(new BaseAdapter.OnItemClickListener() {

@Override

public void onItemClick(View view, int position) {

}

});

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