ListView中的单击响应问题

Question

我参考这个例子写了自己的ListView适配器我现在单击那个按钮后，希望显示出相关的ListView的一项的信息。
而不是每项都是一样的。
请问应该怎么修改啊？public void showInfo(){          new AlertDialog.Builder(this)          .setTitle("我的listview")          .setMessage("介绍...")          .setPositiveButton("确定", new DialogInterface.OnClickListener() {              @Override              public void onClick(DialogInterface dialog, int which) {              }          })          .show();                 } 
         public class MyAdapter extends BaseAdapter{  
    
         private LayoutInflater mInflater;  
            
            
         public MyAdapter(Context context){  
             this.mInflater = LayoutInflater.from(context);  
         }  
         @Override 
         public int getCount() {  
             // TODO Auto-generated method stub  
             return mData.size();  
         }  
    
         @Override 
         public Object getItem(int arg0) {  
             // TODO Auto-generated method stub  
             return null;  
         }  
    
         @Override 
         public long getItemId(int arg0) {  
             // TODO Auto-generated method stub  
             return 0;  
         }  
    
         @Override 
         public View getView(int position, View convertView, ViewGroup parent) {  
                
             ViewHolder holder = null;  
             if (convertView == null) {  
                    
                 holder=new ViewHolder();    
                    
                 convertView = mInflater.inflate(R.layout.vlist2, null);  
                 holder.img = (ImageView)convertView.findViewById(R.id.img);  
                 holder.title = (TextView)convertView.findViewById(R.id.title);  
                 holder.info = (TextView)convertView.findViewById(R.id.info);  
                 holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn);  
                 convertView.setTag(holder);  
                    
             }else {  
                    
                 holder = (ViewHolder)convertView.getTag();  
             }  
                
                
             holder.img.setBackgroundResource((Integer)mData.get(position).get("img"));  
             holder.title.setText((String)mData.get(position).get("title"));  
             holder.info.setText((String)mData.get(position).get("info"));  
                
             holder.viewBtn.setOnClickListener(new View.OnClickListener() {  
                    
                 @Override 
                 public void onClick(View v) {  
                     showInfo();                   
                 }  
             });  
                
                
             return convertView;  
         }  
            
     }  
        
        
        
        
 } 

Answer 1

holder内加个String message成员初始化  holder.message=new String("whatever");
调用    showInfo(holder.message);  
public void showInfo(String msg){ 
         new AlertDialog.Builder(this) 
         .setTitle("我的listview") 
         .setMessage("介绍...:"+msg) 
         .setPositiveButton("确定", new DialogInterface.OnClickListener() { 
             @Override 
             public void onClick(DialogInterface dialog, int which) { 
             } 
         }) 
         .show(); 
     } 

Answer 2

Cannot refer to a non-final variable holder inside an inner class defined in a different method

Answer 3

public class MyListView4 extends ListActivity {  
    
    
     private List<Map<String, Object>> mData;  
        
     @Override 
     public void onCreate(Bundle savedInstanceState) {  
         super.onCreate(savedInstanceState);  
         mData = getData();  
         MyAdapter adapter = new MyAdapter(this);  
         setListAdapter(adapter);  
     }  
    
     private List<Map<String, Object>> getData() {  
         List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();  
    
         Map<String, Object> map = new HashMap<String, Object>();  
         map.put("title", "G1");  
         map.put("info", "google 1");  
         map.put("img", R.drawable.i1);  
         list.add(map);  
    
         map = new HashMap<String, Object>();  
         map.put("title", "G2");  
         map.put("info", "google 2");  
         map.put("img", R.drawable.i2);  
         list.add(map);  
    
         map = new HashMap<String, Object>();  
         map.put("title", "G3");  
         map.put("info", "google 3");  
         map.put("img", R.drawable.i3);  
         list.add(map);  
            
         return list;  
     }  
        
     // ListView 中某项被选中后的逻辑  
     @Override 
     protected void onListItemClick(ListView l, View v, int position, long id) {  
            
         Log.v("MyListView4-click", (String)mData.get(position).get("title"));  
     }  
        
     /**  
      * listview中点击按键弹出对话框  
      */ 
     public void showInfo(){  
         new AlertDialog.Builder(this)  
         .setTitle("我的listview")  
         .setMessage("介绍...")  
         .setPositiveButton("确定", new DialogInterface.OnClickListener() {  
             @Override 
             public void onClick(DialogInterface dialog, int which) {  
             }  
         })  
         .show();  
            
     }  
        
        
        
     public final class ViewHolder{  
         public ImageView img;  
         public TextView title;  
         public TextView info;  
         public Button viewBtn;  
     }  
        
        
     public class MyAdapter extends BaseAdapter{  
    
         private LayoutInflater mInflater;  
            
            
         public MyAdapter(Context context){  
             this.mInflater = LayoutInflater.from(context);  
         }  
         @Override 
         public int getCount() {  
             // TODO Auto-generated method stub  
             return mData.size();  
         }  
    
         @Override 
         public Object getItem(int arg0) {  
             // TODO Auto-generated method stub  
             return null;  
         }  
    
         @Override 
         public long getItemId(int arg0) {  
             // TODO Auto-generated method stub  
             return 0;  
         }  
    
         @Override 
         public View getView(int position, View convertView, ViewGroup parent) {  
                
             ViewHolder holder = null;  
             if (convertView == null) {  
                    
                 holder=new ViewHolder();    
                    
                 convertView = mInflater.inflate(R.layout.vlist2, null);  
                 holder.img = (ImageView)convertView.findViewById(R.id.img);  
                 holder.title = (TextView)convertView.findViewById(R.id.title);  
                 holder.info = (TextView)convertView.findViewById(R.id.info);  
                 holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn);  
                 convertView.setTag(holder);  
                    
             }else {  
                    
                 holder = (ViewHolder)convertView.getTag();  
             }  
                
                
             holder.img.setBackgroundResource((Integer)mData.get(position).get("img"));  
             holder.title.setText((String)mData.get(position).get("title"));  
             holder.info.setText((String)mData.get(position).get("info"));  
                
             holder.viewBtn.setOnClickListener(new View.OnClickListener() {  
                    
                 @Override 
                 public void onClick(View v) {  
                     showInfo();                   
                 }  
             });  
                
                
             return convertView;  
         }  
            
     }  
        
        
        
        
 } 

Answer 4

public View getView(final int position, View convertView, ViewGroup parent) {  
                
             ViewHolder holder = null;  
             if (convertView == null) {  
                    
                 holder=new ViewHolder();    
                    
                 convertView = mInflater.inflate(R.layout.vlist2, null);  
                 holder.img = (ImageView)convertView.findViewById(R.id.img);  
                 holder.title = (TextView)convertView.findViewById(R.id.title);  
                 holder.info = (TextView)convertView.findViewById(R.id.info);  
                 holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn);  
                 convertView.setTag(holder);  
                    
             }else {  
                    
                 holder = (ViewHolder)convertView.getTag();  
             }  
                
                
             holder.img.setBackgroundResource((Integer)mData.get(position).get("img"));  
             holder.title.setText((String)mData.get(position).get("title"));  
             holder.info.setText((String)mData.get(position).get("info"));  
                
             holder.viewBtn.setOnClickListener(new View.OnClickListener() {  
                    
                 @Override 
                 public void onClick(View v) {  
                     showInfo(); //在这里将position传递给showInfo;即showInfo(position);                  
                 }  
             });  
                
                
             return convertView;  
         }  public void showInfo(int position){  //在这个中根据position，即点击的ListView的哪一项，处理相应的信息即可
         new AlertDialog.Builder(this)  
         .setTitle("我的listview")  
         .setMessage("介绍...")  
         .setPositiveButton("确定", new DialogInterface.OnClickListener() {  
             @Override 
             public void onClick(DialogInterface dialog, int which) {  
             }  
         })  
         .show();  
            
     }  
        

Answer 5

public final class ViewHolder{  
         public ImageView img;  
         public TextView title;  
         public TextView info;  
         public Button viewBtn; 
         public String  msg；   //定义每个Item显示的信息
     }  showInfo给个信息的参数就可以了
public void showInfo(String msg)；

Answer 6

Cannot refer to a non-final variable position inside an inner class defined in a different method
出现这个错误~

Answer 7

非final变量 不能在内部类直接使用
在MyAdapter声明一个pos变量，内部类使用时先在外面初始化pos变量
内部类使用MyAdapter.this.pos来调用

Answer 8

你还可以
public class MyClickListener implements View.OnClickListener{ private int position ;

public MyClickListener(int position){
this.position = position;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showInfo(position);
}

}
}
自己写个监听器就好了~