CommonAdapter-万能的ListView.GridView的适配器

大家对于ListView的适配器的使用相信十分熟悉，因为在开发工程中。我们需要经常使用他，重复地进行着继承BaseAdapter、写ViewHolder的繁琐的工作。这时，你是否急需一个万能的Adapter能够让我们远离那些繁琐的工作呢？ CommonAdapter就能够满足大家的需求。

首先我们还是先来介绍一下listView的使用方法吧。

基本的使用就不说了 就粘一下他的Adapter的写法：

<span style="font-size:18px;">import java.util.List;
import java.util.Map;

import com.aaron.util.R;

import android.content.Context;
import android.text.Html;
import android.text.Spanned;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

/**
* @author aaron
*
*/
public class TextSearchAdapter extends BaseAdapter {

private LayoutInflater inflater;
private String keyword;
private PageModel mModel;
private Context mContext;
List<Map<String, Object>> ItemInfoList;

public TextSearchAdapter(Context context,
List<Map<String, Object>> ItemInfoList, PageModel pageModel,
String keyword) {

this.ItemInfoList = ItemInfoList;
this.mContext = context;
this.mModel = pageModel;
this.keyword = keyword;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

static class ViewHolder {
TextView name;
TextView department;
TextView content;
}

/**
* [突出显示]
*
* @param key
* @param s
* @param color
* @return
*/
private Spanned setKeyColor(String key, String s, String color) {
String colorKey = "<font color=\"" + color + "\">" + key + "</font>";
return Html.fromHtml(s.replace(key, colorKey));

}

@Override
public int getCount() {
// TODO Auto-generated method stub
return ItemInfoList.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return ItemInfoList.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;

if (holder == null) {
convertView = inflater.inflate(R.layout.listview_item_sql, null);
holder = new ViewHolder();

holder.name = (TextView) convertView
.findViewById(R.id.list_item_name);
holder.department = (TextView) convertView
.findViewById(R.id.list_item_department);
holder.content = (TextView) convertView
.findViewById(R.id.list_item_content);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
String item = (String) ItemInfoList.get(position).get("content");
holder.content.setText(setKeyColor(keyword, item, "red"));
holder.name.setText((CharSequence) ItemInfoList.get(position).get(
"name"));
holder.department.setText((CharSequence) ItemInfoList.get(position)
.get("department"));
return convertView;
}

} </span>

listView的细节设置：

去除掉ListView的缓存颜色的方法，在设置属性那里设置缓存颜色为透明：

android:cacheColorHint="#00000000"

设置分割线的颜色以及宽度的方法：

android:divider="#cbcbcb"
android:dividerHeight="1dp"

去掉滑动条效果：

android:scrollbars="none"
去掉滑动时listView产生的缓存背景
android:scrollingCache="false"

<ListView
android:id="@+id/lv_orderhandler"
android:layout_width="match_parent"
android:background="#80ECECEC"
android:divider="#cbcbcb"
android:dividerHeight="1dp"
android:cacheColorHint="#00000000"<pre name="code" class="html">                android:scrollbars="none"
android:layout_height="match_parent">
</ListView>

下面我们来介绍一下CommonAdapter的使用：

1.首先我们需要定义我们需要创建一个万能的ViewHolder

此处我就不详细接受ViewHolder的使用含义了，不懂的自己问度娘。

我们可以在这个使用这个万能ViewHolder来设置我们的控件的属性，不过这个ViewHolder只是包含了结果通用的控件的属性标签。如果大家有什么特别的属性标签的，可以自己修改代码。如果不懂，可以模仿我在代码中写的那个setTextBg方法来进行修改。

<span style="font-size:18px;">package com.tutu.common.adapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.tutu.common.ImageLoader;
import com.tutu.common.ImageLoader.Type;

public class ViewHolder
{
private final SparseArray<View> mViews;
private int mPosition;
private View mConvertView;

private ViewHolder(Context context, ViewGroup parent, int layoutId, int position)
{
this.mPosition = position;
this.mViews = new SparseArray<View>();
mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);
// setTag
mConvertView.setTag(this);
}

/**
* 拿到一个ViewHolder对象
*
* @param context
* @param convertView
* @param parent
* @param layoutId
* @param position
* @return
*/
public static ViewHolder get(Context context, View convertView,
ViewGroup parent, int layoutId, int position)
{
if (convertView == null)
{
return new ViewHolder(context, parent, layoutId, position);
}
return (ViewHolder) convertView.getTag();
}

public View getConvertView()
{
return mConvertView;
}

/**
* 通过控件的Id获取对于的控件，如果没有则加入views
*
* @param viewId
* @return
*/
public <T extends View> T getView(int viewId)
{
View view = mViews.get(viewId);
if (view == null)
{
view = mConvertView.findViewById(viewId);
mViews.put(viewId, view);
}
return (T) view;
}

/**
* 为TextView设置字符串
*
* @param viewId
* @param text
* @return
*/
public ViewHolder setText(int viewId, String text)
{
TextView view = getView(viewId);
view.setText(text);
return this;
}

/**
* 为TextView设置背景颜色
*
* @param viewId
* @param text
* @return
*/
public ViewHolder setTextBg(int viewId, int color)
{
TextView view = getView(viewId);
view.setBackgroundColor(color);
return this;
}

/**
* 为ImageView设置图片
*
* @param viewId
* @param drawableId
* @return
*/
public ViewHolder setImageResource(int viewId, int drawableId)
{
ImageView view = getView(viewId);
view.setImageResource(drawableId);

return this;
}

/**
* 为ImageView设置图片
*
* @param viewId
* @param drawableId
* @return
*/
public ViewHolder setImageBitmap(int viewId, Bitmap bm)
{
ImageView view = getView(viewId);
view.setImageBitmap(bm);
return this;
}

/**
* 为ImageView设置图片
*
* @param viewId
* @param drawableId
* @return
*/
public ViewHolder setImageByUrl(int viewId, String url)
{
ImageLoader.getInstance(3, Type.LIFO).loadImage(url, (ImageView) getView(viewId));
return this;
}

public int getPosition()
{
return mPosition;
}

}</span>

2.定义我们的万能适配器CommonAdapter类：

这个万能适配器是利用前面写好的ViewHolder，利用泛型帮我们处理好了getCount,getItem,getItemId三个方法，我们只需要处理getView方法即可。

<span style="font-size:18px;"><span style="font-size:18px;">package com.tutu.common.adapter;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

/**
* 这是个ListView，GridView共用的adapter类
*
* @author chenboling
*
* @param <T>
*/
public abstract class CommonAdapter<T> extends BaseAdapter
{
protected LayoutInflater mInflater;
protected Context mContext;
protected List<T> mDataSource;
protected final int mItemLayoutId;

public CommonAdapter(Context context, List<T> list, int itemLayoutId)
{
this.mContext = context;
this.mInflater = LayoutInflater.from(mContext);
if (null == list) {
list = new ArrayList<T>();
}
this.mDataSource = list;
this.mItemLayoutId = itemLayoutId;
}

@Override
public int getCount()
{
return mDataSource.size();
}

@Override
public T getItem(int position)
{
return mDataSource.size() == 0 ? null : mDataSource.get(position);
}

@Override
public long getItemId(int position)
{
return mDataSource.size() == 0 ? 0 : mDataSource.get(position).hashCode();
}

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
final ViewHolder viewHolder = getViewHolder(position, convertView, parent);
convert(viewHolder, getItem(position));
return viewHolder.getConvertView();

}

public abstract void convert(ViewHolder viewHolder, T item);

private ViewHolder getViewHolder(int position, View convertView, ViewGroup parent)
{
return ViewHolder.get(mContext, convertView, parent, mItemLayoutId, position);
}

/**
* 向数据源中动态添加一项
*
* @param t
*/
public void addItem(T t) {
if (this.mDataSource == null) {
this.mDataSource = new ArrayList<T>();
}
this.mDataSource.add(t);
this.notifyDataSetChanged();
}

/**
* 刷新数据源
*
* @param newDataSource
*/
public void refreshDataSource(List<T> newDataSource) {
if (null == newDataSource)
return;
this.mDataSource = newDataSource;
this.notifyDataSetChanged();
}

}</span></span>

3.使用示例

<span style="font-size:18px;"><span style="font-size:18px;">        lv_store_rderDetail.setAdapter(new CommonAdapter<DetailBean>(
getApplicationContext(), mDatas, R.layout.item_store_detail) {
@Override
public void convert(ViewHolder viewHolder, DetailBean item) {
viewHolder.setText(R.id.tv_name_detailItem, item.getName());
viewHolder.setText(R.id.tv_percent_detailItem, item.getPercent());
viewHolder.setTextBg(R.id.tv_color_detailItem, item.getColor());

}

});</span></span>

此处是根据我自己的理解进行写的，只是方便以后自己查阅。细节不够详细敬请谅解。

如果大家想要更详细的解释，请访问鸿洋大神的博客：http://blog.csdn.net/lmj623565791/article/details/38902805/