Android.Util.AndroidRuntimeException： <Timeout exceeded getting exception details> 发生了

Question

I am android c# developer beginner and need to work in back ground showing my listview but my code have a load action such as fetching database and convert from byte array to image so I used async task but it hangs and give me this error Unhandled Exception:

Android.Util.AndroidRuntimeException: occurred

//this my async class :

public class UpdatePB : AsyncTask<string, string, string>
{
    private Activity context;
    private ProgressDialog progressDialog;

    public List<Advertise_TableItem> GroupLst;
    Dictionary<Advertise_TableItem, List<Replies_TableItem>> ChildLst;
    //  Advertise_HomeScreenAdapter adb;
    public ExpandableListViewAdapter Adapter;
    AbdoService.abdo_service AbdoService;

    //string user_id;
    Context myContext;
    ExpandableListView listview;
    DataTable table;
    public UpdatePB(Activity context, ExpandableListView listview, Context myContext)
    {
        this.context = context;
        this.listview = listview;
        this.myContext = myContext;


    }
    protected override string RunInBackground(string[] @params)
    {
        //System.Threading.Thread.Sleep(3000);

        //adb = new Advertise_HomeScreenAdapter(this, tableItems);
        //listview.Adapter = adb;

        //progressDialog = new ProgressDialog(context);
        //progressDialog.Show();


        AbdoService = new AbdoService.abdo_service();

        GroupLst = new List<Advertise_TableItem>();
        ChildLst = new Dictionary<Advertise_TableItem, List<Replies_TableItem>>();
        if (CrossConnectivity.Current.IsConnected)
        {


            table = AbdoService.selectAllAdvertises().table;

            int I = 0;
            foreach (DataRow item in table.Rows)
            {
                // bitmap = BitmapFactory.DecodeByteArray(AbdoService.GetByteImage(item[1].ToString()).ByteImage, 0, AbdoService.GetByteImage(item[1].ToString()).ByteImage.Length);


                GroupLst.Add(new Advertise_TableItem(item[1].ToString(), item[2].ToString(), item[3].ToString(), item[0].ToString()));
                List<Replies_TableItem> child = new List<Replies_TableItem>();
                //child.Add(new Replies_TableItem("mohammed", "comment 1 "));
                //child.Add(new Replies_TableItem("ahmed", "comment 2 "));
                var childTable = AbdoService.selectReply(item[0].ToString());
                foreach (DataRow childItem in childTable.table.Rows)
                {
                    child.Add(new Replies_TableItem(childItem[1].ToString(), childItem[2].ToString()));
                }
                ChildLst.Add(GroupLst[I], child);

                I++;

            }

        }
        else
        {
            if_connected();
        }



        Adapter = new ExpandableListViewAdapter(myContext, GroupLst, ChildLst);
        ////System.Threading.Thread.Sleep(3000);
        listview.SetAdapter(Adapter);


        for (int i = 0; i < Adapter.GroupCount; i++)
        {
            listview.ExpandGroup(i);
        }

        //listview.GroupClick += Listview_GroupClick;

        //startServices();
        ////RunOnUiThread(() => progressBar.Visibility = ViewStates.Invisible);

        return context.Title;

    }
    public void if_connected()
    {





        var callDialog = new Android.App.AlertDialog.Builder(context);
        callDialog.SetTitle("Notify");
        callDialog.SetMessage("connect internet");
        callDialog.SetNeutralButton("ok", delegate
        {
            context.Finish();
            context.StartActivity(typeof(AllAdvertises));
        });
        callDialog.Show();

    }
    protected override void OnPreExecute()
    {
        progressDialog = new ProgressDialog(context);
        progressDialog.Show();

    }

    //protected override void OnProgressUpdate(params string[] values)
    //{
    //    //mtv.Text = Convert.ToString(values[0]);
    //    //Android.Util.Log.Error("lv==", values[0] + "");
    //    listview.SetAdapter(Adapter);


    //    for (int i = 0; i < Adapter.GroupCount; i++)
    //    {
    //        listview.ExpandGroup(i);
    //    }

    //}
    protected override void OnPostExecute(string result)
    {
        result = context.Title;

        progressDialog.Dismiss();
    }


}
//this is my Activity function oncreate()
protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        // Set our view from the "main" layout resource
        SetTheme(Resource.Style.AppTheme);
        SetContentView(Resource.Layout.AllAdvertises);

        //progressDialog = new ProgressDialog(this);
        //progressDialog.SetMessage("hiiiiiiiiiiiii");
        //progressDialog.Show();
        //    System.Threading.Thread.Sleep(1000);



        //ProgressBar progressBar = FindViewById<ProgressBar>(Resource.Id.progressBar);

        //RunOnUiThread(() => progressBar.Visibility=ViewStates.Visible);
        //DoSomeWork1(arguments);




        prefs = PreferenceManager.GetDefaultSharedPreferences(this);
        TextView UserName = FindViewById<TextView>(Resource.Id.txtUserName);
        string user_id = prefs.GetString("UserId", "0");
        if (user_id != "0")
        {
            UserName.Text = " Hello " + prefs.GetString("UserName", "0");
        }


        //AbdoService = new AbdoService.abdo_service();

        ////table= b.GetResult();
        ////    //AbdoService.selectAllAdvertisesCompleted += AbdoService_selectAllAdvertisesCompleted;
        ////    //AbdoService.selectAllAdvertisesAsync();
        listview = FindViewById<ExpandableListView>(Resource.Id.EdListView);
        //GroupLst = new List<Advertise_TableItem>();
        //ChildLst = new Dictionary<Advertise_TableItem, List<Replies_TableItem>>();
        //if (CrossConnectivity.Current.IsConnected)
        //{


        //    //table = AbdoService.selectAllAdvertises().table;

        //    int I = 0;
        //    foreach (DataRow item in table.Rows)
        //    {
        //        // bitmap = BitmapFactory.DecodeByteArray(AbdoService.GetByteImage(item[1].ToString()).ByteImage, 0, AbdoService.GetByteImage(item[1].ToString()).ByteImage.Length);


        //        GroupLst.Add(new Advertise_TableItem(item[1].ToString(), item[2].ToString(), item[3].ToString(), item[0].ToString()));
        //        List<Replies_TableItem> child = new List<Replies_TableItem>();
        //        //child.Add(new Replies_TableItem("mohammed", "comment 1 "));
        //        //child.Add(new Replies_TableItem("ahmed", "comment 2 "));
        //        var childTable = AbdoService.selectReply(item[0].ToString());
        //        foreach (DataRow childItem in childTable.table.Rows)
        //        {
        //            child.Add(new Replies_TableItem(childItem[1].ToString(), childItem[2].ToString()));
        //        }
        //        ChildLst.Add(GroupLst[I], child);

        //        I++;

        //    }
        //}
        //else
        //{
        //    if_connected();
        //}
        ////adb = new Advertise_HomeScreenAdapter(this, tableItems);
        ////listview.Adapter = adb;






        //Adapter = new ExpandableListViewAdapter(this, GroupLst, ChildLst);
        UpdatePB uptask = new UpdatePB(this, listview, this);
        uptask.Execute("paramter");
        //uptask.GetResult();
        //listview.SetAdapter(Adapter);
        //for (int i = 0; i < Adapter.GroupCount; i++)
        //{
        //    listview.ExpandGroup(i);
        //}

        listview.GroupClick += Listview_GroupClick;

        startServices();

        //////RunOnUiThread(() => progressBar.Visibility = ViewStates.Invisible);

    }

Answer 1

you can not touch the UI from a background thread so you need to move this line:

listview.SetAdapter(Adapter);
for (int i = 0; i < Adapter.GroupCount; i++)
 {
      listview.ExpandGroup(i);
 }

from RunInBackground(string[] @params) to OnPostExecute(string result)

also move if_connected(); from RunInBackground(string[] @params) to OnPostExecute(string result) because if_connected(); shows a dialog it can not be run in background

And add your complete Stack Trace of error to your question because there may be some other errors there in addition to mentioned ones.