Android Question Show image in Gallery (Android 7.0)

GGSoft

Member
Licensed User
After searching in the forum, I tried this code:
B4X:
' The image
Dim bitmap As Bitmap = LoadBitmap(File.DirAssets, "prueba.jpg")

' Copy to ...files/pruebas/prueba.jpg
Dim Out As OutputStream
Dim r As RuntimePermissions
Out = File.OpenOutput(r.GetSafeDirDefaultExternal("pruebas"), "prueba.jpg", False)
bitmap.WriteToStream(Out, 100, "JPEG")
Out.Close

' "Broadcast" image to gallery
Dim Phone As Phone
If Phone.SdkVersion < 19 Then
    ' This works            :)
    Dim i As Intent
    'i.Initialize("android.intent.action.MEDIA_MOUNTED", "file://" & File.Combine(r.GetSafeDirDefaultExternal("pruebas"), "prueba.jpg"))
    i.Initialize("android.intent.action.MEDIA_SCANNER_SCAN_FILE", "file://" & File.Combine(r.GetSafeDirDefaultExternal("pruebas"), "prueba.jpg"))
    Phone.SendBroadcastIntent(i)
Else
    ' This does not work    :(
    Dim context As JavaObject
    context = context.InitializeStatic("anywheresoftware.b4a.BA").GetField("applicationContext")
    Dim paths() As String = Array As String(File.Combine(r.GetSafeDirDefaultExternal("pruebas"), "prueba.jpg")) 'files to scan
    Dim mediaScanner As JavaObject
    mediaScanner.InitializeStatic("android.media.MediaScannerConnection")
    mediaScanner.RunMethod("scanFile", Array As Object(context, paths, Null, Null))
End If

It works fine in Androd 4.4- but not in Android 7.0

Can anyone give me an advice, please?
 

DonManfred

Expert
Licensed User
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GGSoft

Member
Licensed User
I almost give up.

From this post I thought it would be easy to show in the images gallery (not open directly, but show the image and then open if desired) any image I get downloaded from a server and saved in RunTimePermissions.GetSafeDirDefaultExternal("foo").

This works (Android 4.3.1-) API 18- (The image is shown in the Gallery)
B4X:
Dim Phone as phone
Dim i As Intent
i.Initialize("android.intent.action.MEDIA_MOUNTED", "file://" & File.Combine(dir2, filename))
Phone.SendBroadcastIntent(i)

This doesn't work (Android 4.4.2 -- 6.0) 19 <= API <= 23 (The image is not shown in the Gallery)
B4X:
Dim context As JavaObject
context = context.InitializeStatic("anywheresoftware.b4a.BA").GetField("applicationContext")
Dim paths() As String = Array As String(File.Combine(dir2,filename)) 'files to scan
Dim mediaScanner As JavaObject
mediaScanner.InitializeStatic("android.media.MediaScannerConnection")
mediaScanner.RunMethod("scanFile", Array As Object(context, paths, Null, Null))

Could not test for API 24 (Android 7.0) through FileProvider.

Isn't any way, similar or analogous, to this (B4i) in B4A?
 
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Erel

Administrator
Staff member
Licensed User
This code works:
B4X:
Sub Activity_Create(FirstTime As Boolean)
   Dim rp As RuntimePermissions
   rp.CheckAndRequest(rp.PERMISSION_WRITE_EXTERNAL_STORAGE)
   Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
   If Result Then
       File.Copy(File.DirAssets, "prueba.jpg", File.DirRootExternal, "Pictures/prueba.jpg")
       Dim FilePath As String = File.Combine(File.DirRootExternal, "Pictures/prueba.jpg")
       Dim Phone As Phone
       If Phone.SdkVersion <= 18 Then           ' min - 4.3.1
           Dim i As Intent
           i.Initialize("android.intent.action.MEDIA_SCANNER_SCAN_FILE", "file://" & FilePath)
           Phone.SendBroadcastIntent(i)
       Else
           Dim ctxt As JavaObject
           ctxt.InitializeContext
           Dim MediaScannerConnection As JavaObject
           MediaScannerConnection.InitializeStatic("android.media.MediaScannerConnection")
           Dim interface As Object = MediaScannerConnection.CreateEventFromUI("android.media.MediaScannerConnection.OnScanCompletedListener", "ScanCompleted", _
           Null)
           MediaScannerConnection.RunMethod("scanFile", Array(ctxt, Array As String(FilePath), Array As String("image/jpeg"), interface))
       End If
   End If

End Sub

Sub ScanCompleted_Event (MethodName As String, Args() As Object) As Object
   Log(Args(0))
   Log(Args(1))
   Return Null
End Sub
 
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GGSoft

Member
Licensed User
This code works:
B4X:
Sub Activity_Create(FirstTime As Boolean)
   Dim rp As RuntimePermissions
   rp.CheckAndRequest(rp.PERMISSION_WRITE_EXTERNAL_STORAGE)
   Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
   If Result Then
       File.Copy(File.DirAssets, "prueba.jpg", File.DirRootExternal, "Pictures/prueba.jpg")
       Dim FilePath As String = File.Combine(File.DirRootExternal, "Pictures/prueba.jpg")
       Dim Phone As Phone
       If Phone.SdkVersion <= 18 Then           ' min - 4.3.1
           Dim i As Intent
           i.Initialize("android.intent.action.MEDIA_SCANNER_SCAN_FILE", "file://" & FilePath)
           Phone.SendBroadcastIntent(i)
       Else
           Dim ctxt As JavaObject
           ctxt.InitializeContext
           Dim MediaScannerConnection As JavaObject
           MediaScannerConnection.InitializeStatic("android.media.MediaScannerConnection")
           Dim interface As Object = MediaScannerConnection.CreateEventFromUI("android.media.MediaScannerConnection.OnScanCompletedListener", "ScanCompleted", _
           Null)
           MediaScannerConnection.RunMethod("scanFile", Array(ctxt, Array As String(FilePath), Array As String("image/jpeg"), interface))
       End If
   End If

End Sub

Sub ScanCompleted_Event (MethodName As String, Args() As Object) As Object
   Log(Args(0))
   Log(Args(1))
   Return Null
End Sub


Awesome (already tested). Many thanks, Erel. Somehow it's a relief to know that nobody but the wisest man could help me. : )
 
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