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我希望我的列表项仍然响应，onListItemClick()但另外我希望原始图像中的额外图像具有它自己的点击事件。经典的方式，定义onClickListener图像不起作用。我发现我必须定义自己的 listadapter 和 overridegetView()方法。我已锁定定义新的适配器类，我从未使用过自定义适配器。我想浏览选项卡，onListItemClick() 转到选项卡 1，在 ImageClick 上转到选项卡 2。它适用于onListItemClick()但是当我为图像添加第二次单击事件时，应用程序在 MySimpleAdapter.getView() 处因 NullPointerException 而崩溃。任何帮助将不胜感激。谢谢。

public class ListaActivity extends ListActivity {

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list);

    MySimpleAdapter adapter = new MySimpleAdapter(this, elem, R.layout.list_item,
            new String[]{"name","number","address"}, new int[]{R.id.name,R.id.num,R.id.adr});
    setListAdapter(adapter);
   }
    public class MySimpleAdapter extends SimpleAdapter{
    Context context;
    //Activity activity;
public MySimpleAdapter(Context context, ArrayList<HashMap<String, String>> elements,int layout, String [] from, int [] to ){
        super(context,el,layout,from,to);
            this.context = context;
            //this.activity = (Activity) context;
    }

    @Override
    public View getView(int position,View convertView, ViewGroup parent){
        View view = super.getView(position, convertView, parent);
        ImageView image = (ImageView)findViewById(R.id.btn);
        image.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                int tab=2;
                MyTabActivity.switchToTab(tab);
            }
        });
        return view;
    }   


@Override
protected void onListItemClick(ListView l, View v, int position, long id){
     int tab = 1;
     MyTabActivity.switchToTab(tab);
   }
 }
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1 回答 1

1

从以下行更改：

ImageView image = (ImageView)findViewById(R.id.btn);

至

ImageView image = (ImageView)view.findViewById(R.id.btn);
于 2011-12-06T11:20:32.450 回答