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());

     }

 }