Android Question Images loaded in webviews are not displayed in mode “debug (rapid)” B4A 3.50 version

bgsoft · Mar 18, 2014

In the new Basic4Android 3.50 version, I realised that images loaded in webviews are not displayed in mode “debug (rapid)”. In other modes, as “debug (legacy)” and “release” are shown normally.

There is a simple example to check this:

B4X:

Sub Globals

  Dim WebV As WebView

End Sub


Sub Activity_Create(FirstTime AsBoolean)

  Activity.LoadLayout("Layout1")

  WebV.Initialize("WebV")

  Activity.AddView(WebV, 0dip, 0dip, 100%x, 100%y)

  WebV.LoadHtml("<html><body background='file:///android_asset/image.jpg'></body></html>")

End Sub

regards

Erel · Mar 18, 2014

By default the rapid debugger saves the assets files in a "virtual assests folder". This allows the debugger to only update modified files instead of packaging all the files each deployment.

You have two options:
1. Disable the virtual assets folder feature. Add this line to the main activity: #DebuggerForceStandardAssets: true

Or better:
2. Use this code (requires JavaObject library):

B4X:

WebV.LoadHtml("<html><body background='" & WebViewAssetFile("image.jpg") & "'></body></html>")


Sub WebViewAssetFile (FileName As String) As String
   Dim jo As JavaObject
   jo.InitializeStatic("anywheresoftware.b4a.objects.streams.File")
   If jo.GetField("virtualAssetsFolder") = Null Then
     Return "file:///android_asset/" & FileName.ToLowerCase
   Else
     Return "file://" & File.Combine(jo.GetField("virtualAssetsFolder"), _
       jo.RunMethod("getUnpackedVirtualAssetFile", Array As Object(FileName)))
   End If
End Sub

This sub will load the correct file in all modes.

bgsoft · Mar 18, 2014

Thank you very much Erel

ibra939 · Sep 11, 2014

Thanks

PSEAD · Mar 10, 2015

I had a slightly different problem which was fixed by adding "#DebuggerForceStandardAssets: true"
When loading a BMP as a panel background image using the designer, it did not show when using the Rapid Debugger but did show using the Legacy Debugger.
The image did show correctly when I changed it to a PNG (without adding the "#DebuggerForceStandardAssets: true" line).

leongcc · Apr 27, 2016

I added #DebuggerForceStandardAssets: true, but there is an error when loading the layout at this statement, Activity.LoadLayout("mainmt").
I have tried adding different directory path but mainmt.bal still cannot be found by the compiler.

Using B4A 5.80.

B4X:

Error occurred on line: 372 (Main)
java.io.FileNotFoundException: mainmt.bal
    at android.content.res.AssetManager.openAsset(Native Method)
    at android.content.res.AssetManager.open(AssetManager.java:324)
    at android.content.res.AssetManager.open(AssetManager.java:298)
    at anywheresoftware.b4a.objects.streams.File.OpenInput(File.java:202)
    at anywheresoftware.b4a.keywords.LayoutBuilder.loadLayout(LayoutBuilder.java:78)
    at anywheresoftware.b4a.objects.ActivityWrapper.LoadLayout(ActivityWrapper.java:208)
    at com.packagename.main._activity_create(main.java:603)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:702)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:339)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:246)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
    at com.packagename.main.afterFirstLayout(main.java:102)
    at com.packagename.main.access$000(main.java:17)
    at com.packagename.main$WaitForLayout.run(main.java:80)
    at android.os.Handler.handleCallback(Handler.java:725)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:153)
    at android.app.ActivityThread.main(ActivityThread.java:5356)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:853)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Resume **

Erel · Apr 27, 2016

Please start a new thread for this.

JohnC · Oct 22, 2016

Erel said:
By default the rapid debugger saves the assets files in a "virtual assests folder". This allows the debugger to only update modified files instead of packaging all the files each deployment.

You have two options:
1. Disable the virtual assets folder feature. Add this line to the main activity: #DebuggerForceStandardAssets: true

Hi Erel,

I had a problem with fonticon's missing from this material drawer lib:

https://www.b4x.com/android/forum/threads/msmaterialdrawer.53883/

And this flag (#DebuggerForceStandardAssets: true) fixed that issue.

But, obviously the more asset files my project has, the less "rapid" the debugger will be.

How can I "refresh" the contacts of this "virtual assets folder" so it has all my physical asset files in it, so I won't need to slow down the debugger using this flag?

Erel · Oct 23, 2016

Please start a new thread for this question.

eps · Apr 12, 2017

I had to set 'caninstalltoexternalstorage' to True as well for this to work on my HTC10

Android Question Images loaded in webviews are not displayed in mode “debug (rapid)” B4A 3.50 version

bgsoft

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