Android Question create bitmap of scrollview

tsteward · Nov 15, 2019

I want to be able to capture an image of the entire activity, just don't know how.
This activity has one scroll view so it needs to capture what is not on the screen as well.

I have tried this but in only captures what is visible.
Dim x As B4XView = Activity
Dim bmp As B4XBitmap = x.Snapshot

LucaMs · Nov 15, 2019

I hope you don't pretend to get a screenshot that also contains items that are not visible!

tsteward · Nov 15, 2019

I don't pretend anything.
Is there a way to capture the entire activity to a bitmap?

LucaMs · Nov 15, 2019

tsteward said:
I don't pretend anything.
Is there a way to capture the entire activity to a bitmap?

Exactly as you did!

tsteward · Nov 15, 2019

Ok is there another way?
To create an image of the whole scroll view?

LucaMs · Nov 15, 2019

tsteward said:
Ok is there another way?
To create an image of the whole scroll view?

B4X:

Dim InternalPanel As B4XView = scv.Panel  '  <--- scv = your ScrollView
Dim xbmp As B4XBitmap = InternalPanel.Snapshot
ImageView1.SetBitmap(xbmp)

tsteward · Nov 15, 2019

I get an error using this code.
It shows on the second line "Dim xbmp As B4XBitmap = InternalPanel.Snapshot"

Error occurred on line: 120 (Main)
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:1252)
at android.graphics.Bitmap.createBitmap(Bitmap.java:1219)
at android.graphics.Bitmap.createBitmap(Bitmap.java:1169)
at android.graphics.Bitmap.createBitmap(Bitmap.java:1130)
at anywheresoftware.b4a.objects.drawable.CanvasWrapper$BitmapWrapper.InitializeMutable(CanvasWrapper.java:654)
at anywheresoftware.b4a.objects.B4XViewWrapper.Snapshot(B4XViewWrapper.java:324)
at b4a.example.main._signbtn_click(main.java:707)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:176)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:6663)
at android.view.View.performClickInternal(View.java:6635)
at android.view.View.access$3100(View.java:794)
at android.view.View$PerformClick.run(View.java:26199)
at android.os.Handler.handleCallback(Handler.java:907)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:216)
at android.app.ActivityThread.main(ActivityThread.java:7625)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)

LucaMs · Nov 16, 2019

Error occurred on line: 120 (Main)
java.lang.IllegalArgumentException: width and height must be > 0

Evidently the ScrollView is empty at that time, so its internal panel has height zero.

tsteward · Nov 16, 2019

I didn't think so. My app only in its early stage but is attached

LucaMs · Nov 16, 2019

I have to search the Geocoder library ...

This one? 2012?
https://www.b4x.com/android/forum/threads/geocoder-library.17115/

tsteward · Nov 16, 2019

LucaMs said:
I have to search the Geocoder library ...

This one? 2012?
https://www.b4x.com/android/forum/threads/geocoder-library.17115/

yes I believe so. but just comment any geocode out. its not needed for this issue......

LucaMs · Nov 16, 2019

B4X:

Sub SignBtn_Click
    'ScrollView1.Visible=False
    'SigningPnl.Visible=True
    Dim InternalPanel As B4XView = ScrollView1.Panel  '  <--- scv = your ScrollView
    Log("Internal Panel Height " & InternalPanel.Height)
    Log("Internal Panel Width " & InternalPanel.Width)
    Dim xbmp As B4XBitmap = InternalPanel.Snapshot

Log:

Internal Panel Height 3633
Internal Panel Width -1

LucaMs · Nov 16, 2019

B4X:

Sub Activity_Create(FirstTime As Boolean)
   'Do not forget to load the layout file created with the visual designer. For example:
   Activity.LoadLayout("main")
   DBFileDir = Starter.rp.GetSafeDirDefaultExternal("") 'File.DirDefaultExternal
  
   ScrollView1.Panel.Width = ScrollView1.Width  '   <------ ADD
   ScrollView1.Panel.LoadLayout("AltLayout")

tsteward · Nov 16, 2019

Well done.
Thank you very much!!!

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