BaseAdapter的优化

传统的

 package cct.commonadapter.bean;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.TextView;
 import java.util.List;
 import cct.commonadapter.R;

 public class MyAdapter extends BaseAdapter {
     private LayoutInflater inflater;
     private List<Message> mdata;
     public MyAdapter(Context context,List<Message> mdata){
          inflater=LayoutInflater.from(context);
         this.mdata=mdata;
     }
     @Override
     public int getCount() {
         return mdata.size();
     }
     @Override
     public Object getItem(int position) {
         return mdata.get(position);
     }
     @Override
     public long getItemId(int position) {
         return position;
     }
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         ViewHolders holder;
         if(convertView==null){
             convertView=inflater.inflate(R.layout.item,parent,false);
             holder=new ViewHolders();
             holder.mtitle= (TextView) convertView.findViewById(R.id.mtitle);
             holder.mdesc= (TextView) convertView.findViewById(R.id.mdesc);
             holder.mtime= (TextView) convertView.findViewById(R.id.mtime);
             holder.mphone= (TextView) convertView.findViewById(R.id.mphone);
             convertView.setTag(holder);
         }
         else {
             holder = (ViewHolders) convertView.getTag();
         }
             Message ms = mdata.get(position);
             holder.mtitle.setText(ms.getTitle());
             holder.mdesc.setText(ms.getDesc());
             holder.mtime.setText(ms.getTime());
             holder.mphone.setText(ms.getPhone());

         return convertView;
     }
     private  class ViewHolders
     {
         TextView mtitle;
         TextView mdesc;
         TextView mtime;
         TextView mphone;
     }
 }

附上Msessage类

     public class Message {
     private String title;
     private String desc;
     private String time;
     private String phone;
     public Message(int position) {
     }
     public Message(String title, String desc, String time, String phone) {
         this.title = title;
         this.desc = desc;
         this.time = time;
         this.phone = phone;
     }
     public String getDesc() {
         return desc;
     }

     public void setDesc(String desc) {
         this.desc = desc;
     }

     public String getTitle() {
         return title;
     }

     public void setTitle(String title) {
         this.title = title;
     }

     public String getTime() {
         return time;
     }

     public void setTime(String time) {
         this.time = time;
     }

     public String getPhone() {
         return phone;
     }

     public void setPhone(String phone) {
         this.phone = phone;
     }

 }

万能适配器

//CommonAdapter
 1 package cct.commonadapter.adapterUtil;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import java.util.List;
 import cct.commonadapter.R;

 public  abstract class CommonAapter<T> extends BaseAdapter {
     protected Context context;
     protected LayoutInflater inflater;
     protected List<T> mdata;

     public CommonAapter(Context context, List<T> mdata) {
         this.context=context;
         inflater=LayoutInflater.from(context);
         this.mdata=mdata;
     }
     @Override
     public int getCount() {
         return mdata.size();
     }

     @Override
     public T getItem(int position) {
         return mdata.get(position);
     }

     @Override
     public long getItemId(int position) {
         return position;
     }
     @Override
     public  View getView(int position, View convertView, ViewGroup parent)
     {
         ViewHolder holder=ViewHolder.get(context,convertView,parent, R.layout.item,position);
         covert(holder,getItem(position));
         return holder.getMconvertView();
     }
     public abstract void covert(ViewHolder holder, T t) ;

 }

通用的Viewholder

 package cct.commonadapter.adapterUtil;
 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;

 public  class ViewHolder {
     private SparseArray<View> mViews;
     protected int mPosition;
     private View mConvertView;
     private Context mContext;
     protected int mLayoutId;

     /**初始化一个ViewHolder
      * @param context
      * @param itemView
      * @param parent
      * @param position
      */
     public ViewHolder(Context context, View itemView, ViewGroup parent, int position) {
         mContext = context;
         mConvertView = itemView;
         mPosition = position;
         mViews = new SparseArray<View>();
         mConvertView.setTag(this);
     }

     /**入口方法:用来判断页面是否加载过
      * @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)
         {
             View itemView = LayoutInflater.from(context).inflate(layoutId, parent,
                     false);
             ViewHolder holder = new ViewHolder(context, itemView, parent, position);
             holder.mLayoutId = layoutId;
             return holder;
         } else
         {
             ViewHolder holder = (ViewHolder) convertView.getTag();
             holder.mPosition = position;
             return holder;
         }
     }
     public View getMconvertView() {
         return mConvertView;
     }

     /**
      * 通过viewId获取View
      * @param viewId
      * @param <T>
      * @return
      */
     public <T extends View>T getView(int viewId){
         View view=mview.get(viewId);
         if(view==null)
         {view=mconvertView.findViewById(viewId);
             mview.put(viewId,view);
         }
         return (T)view;
     }
     public int getLayoutId()
     {
         return mLayoutId;
     }

     public void updatePosition(int position)
     {
         mPosition = position;
     }

     public int getItemPosition()
     {
         return mPosition;
     }

     /**通过得到控件id，和类的属性名
      * @param viewId
      * @param text
      * @return
      */
     public ViewHolder setTexts(int viewId,String text){
         TextView tv=getView(viewId);
         tv.setText(text);
         return this;
     }
     public ViewHolder setImageBitmap(int viewId, Bitmap map){
         ImageView iv=getView(viewId);
         iv.setImageBitmap(map);
         return this;
     }
     public ViewHolder setImageResource(int viewId, int resId)
     {
         ImageView view = getView(viewId);
         view.setImageResource(resId);
         return this;
     }
 public ViewHolder setImageDrawable(int viewId, Drawable drawable)
     {
         ImageView view = getView(viewId);
         view.setImageDrawable(drawable);
         return this;
     }

     public ViewHolder setBackgroundColor(int viewId, int color)
     {
         View view = getView(viewId);
         view.setBackgroundColor(color);
         return this;
     }

     public ViewHolder setBackgroundRes(int viewId, int backgroundRes)
     {
         View view = getView(viewId);
         view.setBackgroundResource(backgroundRes);
         return this;
     }

     public ViewHolder setTextColor(int viewId, int textColor)
     {
         TextView view = getView(viewId);
         view.setTextColor(textColor);
         return this;
     }

     public ViewHolder setTextColorRes(int viewId, int textColorRes)
     {
         TextView view = getView(viewId);
         view.setTextColor(mContext.getResources().getColor(textColorRes));
         return this;
     }
 }

任意一个适配器只需要继承上面封装好的适配器

 package cct.commonadapter.bean;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.TextView;
 import java.util.List;
 import cct.commonadapter.R;
 import cct.commonadapter.adapterUtil.CommonAapter;
 import cct.commonadapter.adapterUtil.ViewHolder;
 import cct.commonadapter.bean.Message;

 public class MyCommonAdapter extends CommonAapter<Message> {
     public MyCommonAdapter(Context context, List<Message> mdata){
         super(context,mdata);
     }

     @Override
     public void covert(ViewHolder holder, Message ms) {

         holder.setTexts(R.id.mtitle,ms.getTitle())
                 .setTexts(R.id.mdesc,ms.getDesc())
                 .setTexts(R.id.mtime,ms.getTime())
                 .setTexts(R.id.mphone,ms.getPhone());
     }
 }