我正在学习在线教程，并尝试自己实现一些功能。
当检测到长按列表项时，如何弹出对话框来提醒用户？以下是该教程中的一些代码：
public class FriendList extends ListActivity
{
private static final int ADD_NEW_FRIEND_ID = Menu.FIRST;
private static final int EXIT_APP_ID = Menu.FIRST + 1;
private IAppManager imService = null;
private FriendListAdapter friendAdapter;
public String ownusername = new String();
private class FriendListAdapter extends BaseAdapter
{
class ViewHolder {
TextView text;
ImageView icon;
}
private LayoutInflater mInflater;
private Bitmap mOnlineIcon;
private Bitmap mOfflineIcon;
private FriendInfo[] friends = null;
public FriendListAdapter(Context context) { // Constructor of Class "FriendListAdapter"
super();
mInflater = LayoutInflater.from(context);
mOnlineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenstar);
mOfflineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.redstar);
}
public void setFriendList(FriendInfo[] friends)
{
this.friends = friends;
}
public int getCount() { // get how many row are in the listview
return friends.length;
}
public FriendInfo getItem(int position) { // get item from the row
return friends[position];
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) { // For modify the content of row
// A ViewHolder keeps references to children views to avoid unneccessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is no need
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.friend_list_screen, null);
// Creates a ViewHolder and store references to the two children views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
}
else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(friends[position].userName);
holder.icon.setImageBitmap(friends[position].status == STATUS.ONLINE ? mOnlineIcon : mOfflineIcon);
return convertView;
}
}
使用代码为：
this.getListView().setLongClickable(true);
this.getListView().setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) {
//Do your tasks here
AlertDialog.Builder alert = new AlertDialog.Builder(
Activity.this);
alert.setTitle("Alert!!");
alert.setMessage("Are you sure to delete record");
alert.setPositiveButton("YES", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//do your work here
dialog.dismiss();
}
});
alert.setNegativeButton("NO", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alert.show();
return true;
}
});
您可以根据需要自定义警报对话框...
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
