Question

我有一个gridview，它使用自定义适配器填充联系人的信息（图像，名称和电话号码）。在点击特定项目时，我想检索联系人的信息（图像，名称和电话号码的信息）。我知道我必须使用setTag（）和getTag（），但我无法弄清楚如何做到这一点。这是我的代码..

自定义适配器的getView方法

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ContactViewHolder contactViewHolder;
    if (convertView == null) {
        LayoutInflater li = getLayoutInflater();
        convertView = li.inflate(R.layout.activity_grid_one_item, null);
        contactViewHolder = new ContactViewHolder();
        contactViewHolder.imgContact = (ImageView) convertView
                .findViewById(R.id.imgViewContactImage);
        contactViewHolder.txtViewContactName = (TextView) convertView
                .findViewById(R.id.txtViewContactName);
        contactViewHolder.txtViewPhoneNumber = (TextView) convertView
                .findViewById(R.id.txtViewPhoneNumber);
        convertView.setTag(contactViewHolder);
    } else {
        contactViewHolder = (ContactViewHolder) convertView.getTag();
    }
    curObj.moveToPosition(position);
    String name = curObj.getString(curObj.getColumnIndex("name"));
    if (name != null) 
        contactViewHolder.txtViewContactName.setText(name);
    else 
        contactViewHolder.txtViewContactName.setText("Unknown");
    String phoneNumber = curObj.getString(curObj.getColumnIndex("number"));

    if (phoneNumber != null)
        contactViewHolder.txtViewPhoneNumber.setText(phoneNumber);
    else 
        contactViewHolder.txtViewPhoneNumber.setText("Unknown");

            String image = curObj.getString(curObj.getColumnIndex("image"));

    if(image.equalsIgnoreCase("R.drawable.addcontactsmall2"))
            contactViewHolder.imgContact.setImageResource(R.drawable.addcontactsmall2);
    else
    {
        Uri uri = Uri.parse(image);
        contactViewHolder.imgContact.setImageURI(uri);
    }
    return convertView;
}

public class ContactViewHolder {
    ImageView imgContact;
    TextView txtViewContactName;
    TextView txtViewPhoneNumber;
}

onItemClick方法

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    View view = (View) arg1.getTag(arg2);
    TextView txtPhoneNumber = (TextView) view.findViewById(R.id.txtview_addcontact_phonenumber);
    System.out.println(txtPhoneNumber.getText().toString());
}

我知道上面的代码不起作用（并且它没有工作，正如预期的那样我得到一个空指针异常），所以如果有人可以指导我如何做到这一点，那将是很多帮助..

Answer 1

在onItemClick中更改此内容

ContactViewHolder view = (ContactViewHolder ) arg1.getTag();
String number = view.getPhNumber();

并在ViewHolder中添加

public class ContactViewHolder {
   ImageView imgContact;
   TextView txtViewContactName;
   TextView txtViewPhoneNumber;

   String phNumber;
   public String getPhNumber() {
       return phNumber;
   }
}

在getView（）

中添加它

String phoneNumber = curObj.getString(curObj.getColumnIndex("number"));
phNumber = phoneNumber ;

为剩余的参数添加相同的代码。它会起作用。

Answer 2

您可以在setOnItemClickListener以及setOnClickListener中获取自定义网格项。

public ImageView img;

your_grid.setOnItemClickListener(new OnItemClickListener()
  {
       public void onItemClick(AdapterView<?> parent, View v, final int position, long id)
          {
               img = (ImageView)v.findViewById(R.id.grid_item_image);
           }
  });

onItemClick - 使用自定义适配器从GridView获取位置

2 个答案: