android - 使用 SimpleAdapter 时为列表视图项设置标签

Question

我想在每个ListView项目中存储一些数据（比如说 ID）并稍后在clickItem侦听器中检索它。

如果我创建自己的适配器，我知道该怎么做。但是，如果我正在使用，是否可以为每个项目设置一个唯一的标签SimpleAdapter？

Answer 1

Without overriding at least getView(), you will have trouble setting tags with every Adapter's view recycler.

However you can simply pass a custom layout with a TextView that has its visibility set to GONE or INVISIBLE and bind data from your List of Maps (List<Map<String, ?>>). Later you can easily fetch this TextView in an OnItemClickListener.

Answer 2

i think this will help you in case you want to identify imageview uniquely by tag like this

     //add this in your getview() method
   ImageView imageView = new ImageView(_context);
   imageView.setTag(1);

and then on listview's/imageView's click check its tag like this

  listview.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {

                  Tag = (Integer) arg1.getTag();

} }

Answer 3

SimpleAdapter 中有一个方法可以做到这一点。它被称为 ViewBinder。尝试在“SimpleAdapter adapter = new SimpleAdapter(this, Maps, R.layout.search, from, to);”之后立即包含此代码 在“setListAdapter(adapter);”之前 （在您的 onCreate 方法中）。

@Override
public void onCreate(Bundle savedInstanceState) {
    //...

    String[] from = new String[] {"ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN"};

int[] to = new int[] { R.id.textView_1, R.id.textView_2, R.id.textView_3, R.id.textView_4, R.id.textView_5, R.id.textView_6, R.id.textView_7};

SimpleAdapter adapter = new SimpleAdapter(this, Maps, R.layout.search, from, to);


    SimpleAdapter.ViewBinder binder = new SimpleAdapter.ViewBinder() {
    @Override
public boolean setViewValue(View view, Object object, String value) {
System.out.println("view= "+view);
    System.out.println("view.toString()= "+ view.toString());
    System.out.println("view.getId()= "+ view.getId()); //The return value will be decimal (not hexadecimal). You can have this value as a global string for later use.
    System.out.println("view.getVisibility()= "+ view.getVisibility());
    System.out.println("view.equals((TextView) view.findViewById(R.id. textView_5))= "+ view.equals((TextView) view.findViewById(R.id.textView_5)));
    if (view.equals((TextView) view.findViewById(R.id.textView_5)))
            {
                TextView textView_five = (TextView) view.findViewById(R.id. textView_5);
                    //Change color/answer/etc for textView_5
            }

//OR
          if (view instanceof TextView) {
                    //Do stuff
                    return true;
                }

                return false;
            }
        };


adapter.setViewBinder(binder);

    setListAdapter(adapter);    
}//End of onCreate

setViewValue 方法将为您调用的每个 R.id.textView_1、R.id.textView_2、R.id.textView_3、R.id.textView_4、R.id.textView_5、R.id.textView_6、R.id.textView_7 调用在“适配器”中有。setViewValue 方法将在每个视图/每次绘制上述 R.id 之一时被调用。

然后，当用户单击 ListView 项目之一并且您想要更改它时，覆盖 onListItemClick 方法。

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
if (v.equals((TextView) v.findViewById(R.id.textView_5)))
    {
TextView textView_five = (TextView) v.findViewById(R.id. textView_5);
    textView_five.setText(“stuff”); 
    //Change color/answer/etc for textView_5
            }
}