Android Question How to remove many labels from screen and draw again with no flickering

EduardoElias · Jul 11, 2017

This app show many data at screen and there a lot of labels and customlistviews inside a Dashboard

Each 5 seconds I remove all the views and recreate them with new data.

Most of the time it has the same data, so this process of recreating just make the screen flicker

My question if there is a way to lock the drawing of the screen while I am creating the labels and customlistviews then when ready unlock the screen. When there is no change, the user will not see that everything was destroyed and them rebuilt.

Thanks

Erel · Jul 11, 2017

If you remove the views and add new ones at the same time then there shouldn't be any flickering.

Try this code in a new project:

B4X:

Sub Activity_Create(FirstTime As Boolean)
   UpdateLabels
End Sub

Sub UpdateLabels
   Do While True
     Activity.RemoveAllViews
     For c = 0 To 9
       For r = 0 To 9
         Dim lbl As Label
         lbl.Initialize("")
         Activity.AddView(lbl, c * 40dip, r * 40dip, 35dip, 35dip)
         lbl.Text = $"$2.0{c * 10 + r}"$
       Next
     Next
     lbl.Text = DateTime.Now Mod DateTime.TicksPerSecond
     Sleep(1000)
   Loop
End Sub

Another possible approach is to reuse the existing views instead of replacing them.

Android Question How to remove many labels from screen and draw again with no flickering

EduardoElias

Well-Known Member

Erel

B4X founder

Similar Threads

Android Question How to remove many labels from screen and draw again with no flickering

EduardoElias

Well-Known Member

Erel

B4X founder

Similar Threads

Privacy & Transparency

Privacy & Transparency