Android Question [B4xpages] Splash - how to remove title bar from mainpage only?

Reminisce · Jul 21, 2020

I'd like to remove title bar from the mainpage and leave the title bar for all other pages active.
I want to use the mainpage as a splash for my app, and it's unprofessional for a splash screen to have a title bar.

Erel · Jul 22, 2020

The attached project implements a splash screen in the main activity. B4XPages is contained in Activity2, which includes the action bar.

The difficult part is in the switch between the full screen activity to the non-full screen activity. The size of the activity will not be correct. The code in this example takes care of it.

Edit: the attached project includes the fix discussed below.

Cross platform implementation: https://www.b4x.com/android/forum/threads/b4x-b4xpages-splash-screen.120851/post-755510

Reminisce · Jul 22, 2020

Woow!!! I love you Erel ????

agraham · Jul 22, 2020

I'm probably being an idiot and missing the glaringly obvious but how is the Main activity shown full screen with these attributes?

B4X:

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
#End Region

This also had me wondering what was happening for a moment or two as well!

B4X:

Wait For ime_HeightChanged (NewHeight As Int, OldHeight As Int)

I'm getting too old and sick to keep up with this

Erel · Jul 23, 2020

Good questions:

1. A full screen theme is set in the manifest editor (https://www.b4x.com/android/forum/threads/full-screen-theme.93892/#content).

2. The IME is required to handle the change in the activity height that happens after the activity is created. There is an edge case here.

LucaMs · Jul 23, 2020

agraham said:
I'm probably being an idiot and missing the glaringly obvious but

agraham said:
I'm getting too old and sick to keep up with this

Erel said:
Good questions:

So, don't worry, @agraham, you are not getting too old

LucaMs · Jul 23, 2020

Erel said:
2. The IME is required to handle the change in the activity height that happens after the activity is created. There is an edge case here.

B4X:

Sub Activity_Create(FirstTime As Boolean)
    Dim ime As IME
    ime.Initialize("ime")
    ime.AddHeightChangedEvent
    Dim pm As B4XPagesManager
    pm.Initialize(Activity)
    CorrectHeight = 100%y
    Wait For ime_HeightChanged (NewHeight As Int, OldHeight As Int)
    CorrectHeight = NewHeight
LogColor("CorrectHeight " & CorrectHeight, Colors.Blue) ' <----
End Sub

Sub ime_HeightChanged (NewHeight As Int, OldHeight As Int)
    LogColor("ime_HeightChanged", Colors.Blue) ' <----
End Sub

I was "testing", because I wasn't sure that Sub ime_HeightChanged would be triggered given the existence of the wait for.

Neither log executed. ?

I used B4A 10 Beta (I know there is the new version).

Erel · Jul 23, 2020

The question is whether you see the red square? If you see a complete red square then it is fine.

LucaMs · Jul 23, 2020

Erel said:
The question is whether you see the red square? If you see a complete red square then it is fine.

Which red square? I don't see it (not even in the source, for now)

Erel · Jul 23, 2020

Run the project. Post a screenshot after the splash screen.

LucaMs · Jul 23, 2020

Ehm... I see... the edges (reading your post I had thought of a small red square - I wasn't following the matter very much, obviously the square serves to highlight the limits, now I'm "more concentrated" ? .

However I don't understand why those logs are not executed ?

agraham · Jul 23, 2020

LucaMs said:
However I don't understand why those logs are not executed

That was why I was wondering about the line

B4X:

Wait For ime_HeightChanged (NewHeight As Int, OldHeight As Int)

The Wait For pre-empts the event Sub which is never run, but I still don't understand the mechanism that returns the event Sub parameters as apparently multiple return values. I need to look at the generated Java code.

Erel · Jul 23, 2020

LucaMs said:
However I don't understand why those logs are not executed

It depends on the device behavior. On some devices the activity will start with the correct height and on other devices it will be updated a few milliseconds after the activity was created.

agraham said:
The Wait For pre-empts the event Sub which is never run, but I still don't understand the mechanism that returns the event Sub parameters as apparently multiple return values. I need to look at the generated Java code.

There is nothing special here. Wait For can be used to catch events.

agraham · Jul 23, 2020

Erel said:
There is nothing special here.

This is the special bit.

Erel said:
Wait For can be used to catch events.

I understand the mechanism of Wait For with Resumable Subs. However I had an unknown unknown (© Donald Rumsfeld) in that I didn't understand the mechanism for catching events and returning their multiple parameters as a list of results.

asales · Jul 24, 2020

Erel said:
The question is whether you see the red square? If you see a complete red square then it is fine.

I don't see. The bottom of the panel is off screen. Why this behavior?

Erel · Jul 24, 2020

This means that the code needs to be improved.

Please change Activity2 code:

B4X:

Sub Activity_Create(FirstTime As Boolean)
    Dim ime As IME
    ime.Initialize("ime")
    ime.AddHeightChangedEvent
    Dim pm As B4XPagesManager
    pm.Initialize(Activity)
    CorrectHeight = 100%y
    Log("A: " & DateTime.Now)
    Wait For ime_HeightChanged (NewHeight As Int, OldHeight As Int)
    Log("B: " & DateTime.Now & ", " & NewHeight & ", " & OldHeight)
    CorrectHeight = NewHeight
End Sub

and post the logs.

asales · Jul 24, 2020

Erel said:
and post the logs.

Here:

B4X:

** Activity (activity2) Create, isFirst = true **
A: 1595593292893
** Activity (activity2) Resume **
B: 1595593293103, 1536, 1608

Erel · Jul 26, 2020

Please try the attached project.

asales · Jul 26, 2020

Erel said:
Please try the attached project.

It worked! Thanks.

Erel · Jul 26, 2020

I've uploaded the updated project to post #2.

Android Question [B4xpages] Splash - how to remove title bar from mainpage only?

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