编写自己的Adapter模板

如果你项目一直用系统给你封装的BaseAdapter的话，那么我只想说，你不累么？
代码繁多还要写数据缓存，还不如自己动手写一个模板吧，这样后面项目就可以直接套用了，编写和执行效率大大提升啊。
BaseAdapter.java

 
      001 
       import java.util.ArrayList;  
     
      002 
       import java.util.Collection;  
     
      003 
       import java.util.Collections;  
     
      004 
       import java.util.Comparator;  
     
      005 
       import java.util.List;  
     
      006 
        
      007 
       import android.content.Context;  
     
      008 
       import android.content.res.Resources;  
     
      009 
       import android.view.LayoutInflater;  
     
      010 
       import android.view.View;  
     
      011 
       import android.view.ViewGroup;  
     
      012 
        
      013 
        
      014 
      /** 
     
      015 
        * 实现这个适配器模板会少很多代码  
     
      016 
        * @author leehom  
     
      017 
        * @param <T>  
     
      018 
        */  
     
      019 
       public abstract class BaseAdapter<T> extends android.widget.BaseAdapter {  
     
      020 
        
      021 
           protected List<T> list;  
     
      022 
           protected Context context;  
     
      023 
           protected LayoutInflater inflater;  
     
      024 
           private int layoutID;  
     
      025 
        
      026 
           public BaseAdapter(Context context, T[] ts, int layoutID) {  
     
      027 
               super();  
     
      028 
               this.context = context;  
     
      029 
               this.list = new ArrayList<T>();  
     
      030 
               this.layoutID = layoutID;  
     
      031 
               Collections.addAll(list, ts);  
     
      032 
               this.inflater = LayoutInflater.from(context);  
     
      033 
           }  
     
      034 
        
      035 
           public BaseAdapter(Context context, List<T> list, int layoutID) {  
     
      036 
               super();  
     
      037 
               this.layoutID = layoutID;  
     
      038 
               this.context = context;  
     
      039 
               this.list = new ArrayList<T>();  
     
      040 
               this.list.addAll(list);  
     
      041 
               this.inflater = LayoutInflater.from(context);  
     
      042 
           }  
     
      043 
        
      044 
           public Resources getResources() {  
     
      045 
               return context.getResources();  
     
      046 
           }  
     
      047 
        
      048 
           public synchronized void add(T object) {  
     
      049 
               list.add(object);  
     
      050 
           }  
     
      051 
        
      052 
           public synchronized void addAll(Collection<? extends T> collection) {  
     
      053 
               list.addAll(collection);  
     
      054 
           }  
     
      055 
        
      056 
           public synchronized void remove(T object) {  
     
      057 
               list.remove(object);  
     
      058 
           }  
     
      059 
        
      060 
           public synchronized void insert(T object, int index) {  
     
      061 
               list.add(index, object);  
     
      062 
           }  
     
      063 
        
      064 
           public synchronized void clear() {  
     
      065 
               list.clear();  
     
      066 
           }  
     
      067 
        
      068 
           public synchronized void sort(Comparator<? super T> comparator) {  
     
      069 
               Collections.sort(list, comparator);  
     
      070 
           }  
     
      071 
        
      072 
           @Override  
     
      073 
           public T getItem(int position) {  
     
      074 
               // TODO Auto-generated method stub  
     
      075 
               return list.get(position);  
     
      076 
           }  
     
      077 
        
      078 
           @Override  
     
      079 
           public int getCount() {  
     
      080 
               // TODO Auto-generated method stub  
     
      081 
               return list.size();  
     
      082 
           }  
     
      083 
        
      084 
           @Override  
     
      085 
           public long getItemId(int position) {  
     
      086 
               // TODO Auto-generated method stub  
     
      087 
               return position;  
     
      088 
           }  
     
      089 
        
      090 
           @Override  
     
      091 
           public View getView(int position, View convertView, ViewGroup parent) {  
     
      092 
               // TODO Auto-generated method stub  
     
      093 
               ViewHolder holder = null;  
     
      094 
               if (convertView == null) {  
     
      095 
                   convertView = inflater.inflate(layoutID, null);  
     
      096 
                   holder = new ViewHolder(convertView);  
     
      097 
                   initView(holder);  
     
      098 
                   convertView.setTag(holder);  
     
      099 
               } else {  
     
      100 
                   holder = (ViewHolder) convertView.getTag();  
     
      101 
               }  
     
      102 
               setViewValue(holder, position);  
     
      103 
               return convertView;  
     
      104 
           }  
     
      105 
        
      106 
           public List<T> getList() {  
     
      107 
               return list;  
     
      108 
           }  
     
      109 
             
      110 
           /**  
     
      111 
            * 向ViewHolder类里面添加View  
     
      112 
            * @param holder  
     
      113 
            */  
     
      114 
           public abstract void initView(ViewHolder holder);  
     
      115 
        
      116 
           /**  
     
      117 
            * 从ViewHolder获取对应ID的View设置其值  
     
      118 
            * @param holder  
     
      119 
            * @param t 数据对象  
     
      120 
            */  
     
      121 
           public abstract void setViewValue(ViewHolder holder, int position);  
     
      122 
        
      123 
      }

用的时候也是继承它，然后只需要初始化ID和设置Value就行了。例：

 
      01 
       import java.lang.reflect.Field;  
     
      02 
       import java.lang.reflect.InvocationTargetException;  
     
      03 
       import java.lang.reflect.Method;  
     
      04 
       import java.util.ArrayList;  
     
      05 
        
      06 
       import android.annotation.SuppressLint;  
     
      07 
       import android.content.Context;  
     
      08 
        
      09 
       import com.fenjin.app.humiture.R;  
     
      10 
       import com.fenjin.app.item.DefaultItem;  
     
      11 
        
      12 
       @SuppressLint("DefaultLocale")  
     
      13 
       public class DefaultAdapter extends BaseAdapter<DefaultItem> {  
     
      14 
        
      15 
           public DefaultAdapter(Context context, Object object) {  
     
      16 
               super(context, new ArrayList<DefaultItem>(),  
     
      17 
                       R.layout.default_list_item_layout);  
     
      18 
               // TODO Auto-generated constructor stub  
     
      19 
               try {  
     
      20 
                   Field[] fields = object.getClass().getDeclaredFields();  
     
      21 
                   for (Field field : fields) {  
     
      22 
                       String lable = field.getName();  
     
      23 
                       String firstWord = lable.substring(0, 1).toUpperCase();  
     
      24 
                       StringBuffer buffer = new StringBuffer("get");  
     
      25 
                       buffer.append(firstWord);  
     
      26 
                       buffer.append(lable.substring(1));  
     
      27 
                       String name = buffer.toString();  
     
      28 
                       Method method = object.getClass().getDeclaredMethod(name);  
     
      29 
                       String value = method.invoke(object).toString();  
     
      30 
                       DefaultItem item = new DefaultItem(lable, value);  
     
      31 
                       add(item);  
     
      32 
                   }  
     
      33 
               } catch (IllegalArgumentException e) {  
     
      34 
                   // TODO Auto-generated catch block  
     
      35 
                   e.printStackTrace();  
     
      36 
               } catch (NoSuchMethodException e) {  
     
      37 
                   // TODO Auto-generated catch block  
     
      38 
                   e.printStackTrace();  
     
      39 
               } catch (IllegalAccessException e) {  
     
      40 
                   // TODO Auto-generated catch block  
     
      41 
                   e.printStackTrace();  
     
      42 
               } catch (InvocationTargetException e) {  
     
      43 
                   // TODO Auto-generated catch block  
     
      44 
                   e.printStackTrace();  
     
      45 
               }  
     
      46 
           }  
     
      47 
        
      48 
           @Override  
     
      49 
           public void initView(ViewHolder holder) {  
     
      50 
               // TODO Auto-generated method stub  
     
      51 
               holder.addView(R.id.default_lable);  
     
      52 
               holder.addView(R.id.default_value);  
     
      53 
           }  
     
      54 
        
      55 
           @Override  
     
      56 
           public void setViewValue(ViewHolder holder, int position) {  
     
      57 
               // TODO Auto-generated method stub  
     
      58 
               DefaultItem item = getItem(position);  
     
      59 
               holder.getTextView(R.id.default_lable).setText(item.getLable());  
     
      60 
               holder.getTextView(R.id.default_value).setText(item.getValue());  
     
      61 
           }  
     
      62 
        
      63 
           @Override  
     
      64 
           public boolean isEnabled(int position) {  
     
      65 
               // TODO Auto-generated method stub  
     
      66 
               return false;  
     
      67 
           }  
     
      68 
        
      69 
      }

javabean代码

 
      01 
       public class DefaultItem {  
     
      02 
        
      03 
           String lable;  
     
      04 
           String value;  
     
      05 
        
      06 
           public DefaultItem(String lable, String value) {  
     
      07 
               super();  
     
      08 
               this.lable = lable;  
     
      09 
               this.value = value;  
     
      10 
           }  
     
      11 
        
      12 
           public String getLable() {  
     
      13 
               return lable;  
     
      14 
           }  
     
      15 
        
      16 
           public void setLable(String lable) {  
     
      17 
               this.lable = lable;  
     
      18 
           }  
     
      19 
        
      20 
           public String getValue() {  
     
      21 
               return value;  
     
      22 
           }  
     
      23 
        
      24 
           public void setValue(String value) {  
     
      25 
               this.value = value;  
     
      26 
           }  
     
      27 
        
      28 
      }

xml代码

 
      01 
       <?xml version="1.0" encoding="utf-8"?>  
     
      02 
       <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
     
      03 
           android:layout_width="match_parent"  
     
      04 
           android:layout_height="match_parent"  
     
      05 
           android:orientation="horizontal"  
     
      06 
           android:padding="@dimen/margin_10" >  
     
      07 
        
      08 
           <TextView  
     
      09 
               android:id="@+id/default_lable"  
     
      10 
               android:layout_width="wrap_content"  
     
      11 
               android:layout_height="wrap_content" />  
     
      12 
        
      13 
           <TextView  
     
      14 
               android:layout_width="wrap_content"  
     
      15 
               android:layout_height="wrap_content"  
     
      16 
               android:text=":" />  
     
      17 
        
      18 
           <TextView  
     
      19 
               android:id="@+id/default_value"  
     
      20 
               android:layout_width="wrap_content"  
     
      21 
               android:layout_height="wrap_content" />  
     
      22 
        
      23 
       </LinearLayout>

每次实现的代码仅仅这么点

 
      01 
      @Override 
     
      02 
       public void initView(ViewHolder holder) {  
     
      03 
           // TODO Auto-generated method stub  
     
      04 
           holder.addView(R.id.default_lable);  
     
      05 
           holder.addView(R.id.default_value);  
     
      06 
      } 
     
      07 
        
      08 
      @Override 
     
      09 
       public void setViewValue(ViewHolder holder, int position) {  
     
      10 
           // TODO Auto-generated method stub  
     
      11 
           DefaultItem item = getItem(position);  
     
      12 
           holder.getTextView(R.id.default_lable).setText(item.getLable());  
     
      13 
           holder.getTextView(R.id.default_value).setText(item.getValue());  
     
      14 
      }

是不是非常不错呢？

本文固定链接: http://www.ithtw.com/1300.html
leehom 2015年03月06日于 IT十万为什么发表

编写自己的Adapter模板

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