How to change main/start screen?

[Phu Duong]

Hi,

how to change the mainscreen in appinventor? I want to make a another screen show up first when i start the app. How to do that?

I want to make the "start_screen" to run first when i start the app.

I am sorry if this is a bad question and spam this great forum, but i am a neewbie :( 

[Taifun]

in Screen1.Initialize use the "open another screen (  Start_Screen )" block

Taifun

puravidaapps.com

[Phu Duong]

Thanks for asnwer, but i have a button in "start_screen" that redirect you to "screen1" but when it loads "screen1" then it loads back to "start_screen"

How to fix this issue?

[Taifun]

try this:

Taifun

puravidaapps.com

[Phu Duong]

No, that did not work :( Maybe you can take a look on my app and  maybe find the problem?

[Taifun]

in my last post I added an App Inventor source file called x.zip which works.

Just take a look!

Taifun

[Phu Duong]

But when i click on the back button on my phone then i get error 903 "bad value was recieved from other screen" It is possible to change the order of the screens in the viewer?

[Taifun]

this is a known bug, see here: 

https://groups.google.com/d/topic/programming-with-app-inventor/JI38exr6Z4w/discussion

Taifun

puravidaapps.com

[Phu Duong]

ok, thank you very much, but how to fix this bug?

[brett328]

I use a different work around in my app that is seamless. I use only 1 screen for everything. Set all elements except for the "start screen" to not visible (uncheck visible box).  then as you navigate from 1 synthetic screen to another, just have the buttons declare the desired screen "visible" and the undesired screen not visible. It gives the illusion of jumping from screen to screen, but in reality, you are just making the desired portions visible and the turning off visibility for the undesired elements.

[Phu Duong]

It is not possible to un-check the visible box because it is none uncheck boxes.

[brett328]

What has no "visible" box?  All elements that you add to the screen have a "visible" box.  I am suggesting that you do not create 2 screens.  Keep everything on screen1.  Then if you want to make it appear as if you are going to a new screen, just toggle all the currently "visible" boxes to empty and turn on the "visible" boxes for the elements that you now want to appear.

[Phu Duong]

It is no visible box for screens! And i need 2 screens for a welcome screen

[Taifun]

you have 2 possibilities:

1. use the new multiple screen feature and wait, until the bug is fixed, or

2. use one screen only (brett's suggestion) together with one of the multiple screen templates, available for download here: http://code.google.com/p/the-ai-repository/downloads/list 

Taifun

[Phu Duong]

What is the new multiple screen feature?

[M. Hossein Amerkashi]

Previously, AI had only 1 screen (Screen1). For apps that required multiple screens, you had to simulate and make components visible or not visible giving impression that user is switching to a different screen. New version now has multiple screen so that you don't have to go through this. In designer, when you select a different screen (e.g. Screen2), then your designer components only show only related components AND same for blocks editor.

-Hossein

[Laura Bermudez]

I have been trying to do this on my app. However, I cannot figure out how to make the different screens visible and invisible