Android Question [SOLVED] Screen Orientation - Save All Views ImageView Bitmap NULL

mmieher

Active Member
Licensed User
Still in the depths of the screen orientation change learning curve. Trying to save all the dynamic views in an Activity, so that I can restore them in Activity_Resume.

I am surprised that I have not been able to find a good example of handling a rotation in the forum. I have spent hours looking. I am probably making this too hard. Finally found something I like better about iOS than Android.

I am testing this on my Main layout. The layout has three ImageViews. In the code below, the ImageBiew.Bitmap is always null, even though the IV has a width and height. I can see the images on the screen before rotating the device. Here is the code:

B4X:
Sub Activity_Pause (UserClosed As Boolean)
    Wait For (SaveState(Activity)) complete (Result As Int)
  
End Sub

Public Sub SaveState(inActivity As Activity) As ResumableSub
  
    For i = 0 To inActivity.NumberOfViews - 1
      
        Dim v As View = inActivity.GetView(i)
      
        Log("Type = " & GetType(v))
        Log("Tag = " & v.Tag)
      
        If v Is ImageView Then
            Log("v is ImageView")
          
            Dim iv As ImageView = v
          
            If iv.IsInitialized Then
                Dim bm As Bitmap = iv.Bitmap
                Log("bm W = " & bm.Width & " bm H = " & bm.Height)
              
                Try
                    Starter.kvs.PutBitmap("imageview",bm)
                Catch
                    Log("bitmap is null")
                End Try
              
                Log("Saved ImageView " & i)
              
            End If
        End If
      
    Next
  
    Return True
  
End Sub
Log Stuff:
** Activity (main) Pause, UserClosed = false **
Type = anywheresoftware.b4a.BALayout
Tag =
Type = android.widget.ImageView
Tag = ivCustLogo
v is ImageView
bm W = 75 bm H = 57
java.lang.NullPointerException: Attempt to invoke virtual method 'byte[] anywheresoftware.b4a.randomaccessfile.B4XSerializator.ConvertObjectToBytes(java.lang.Object)' on a null object reference
[...]
bitmap is null

Saved ImageView 1
Type = android.widget.TextView
Tag =
Type = android.widget.TextView
Tag =
Type = android.widget.ImageView
Tag = iStartCustomer
v is ImageView
bm W = 852 bm H = 480
bitmap is null
Saved ImageView 4
Type = de.amberhome.objects.internal.InternalToolbar
Tag =
Type = android.widget.TextView
Tag =
Type = android.widget.TextView
Tag =
Type = android.widget.TextView
Tag =
Type = android.widget.ImageView
Tag = ivLogo
v is ImageView
bm W = 125 bm H = 125
bitmap is null
Saved ImageView 9
Main Activity_Resume
 

mmieher

Active Member
Licensed User
As usual, after spending hours on the problem, I found the answer shortly after making a post. I was not doing a kvs.initialize in Starter. Sorry for the fire drill.
 
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