Android Question How to load image from api to image control

[junaidahmed]

I have an rest api get method which return Image URL.I would like to know how to set this Image URL in Image control .i have tried below code but its shows an error message "java.lang.classCasstException: can not be cast to android.graphics.bitmap"

Public Sub GetImage(URL As String, Parameters() As String, Token As String) As ResumableSub

Dim Result As String
Dim j As HttpJob
Try
j.Initialize("", Me)
j.Download2(Main.Link & URL, Parameters)
'j.GetRequest.SetContentType("application/json")
'j.GetRequest.SetHeader("Content-Length",Parameters.Length)
If Not(Token.Length = 0) Then
j.GetRequest.SetHeader("Authorization", $"Bearer ${Token}"$)
End If
Wait For (j) JobDone(j As HttpJob)
If j.Success Then
Result = j.GetString
JSON.Initialize(Result) 'Read the text from a file.
Map1 = JSON.NextObject
Log(Map1.Get("ImageURL"))
ImgEmp.SetBackgroundImage(Map1.Get("ImageURL"))

Else
'xui.MsgboxAsync( j.Response.ErrorResponse,"")
Result = j.Response.ErrorResponse
End If
Catch
Log(LastException)
xui.MsgboxAsync(LastException,"exception")
End Try
j.Release
Return Result
End Sub

 

[drgottjr]

Log(Map1.Get("ImageURL"))

1) this is not an image (or bitmap). if is, presumably, the url where you will find it. you need to go back and download the imabe from its url. just go back with okhttputils2.
2) in the extremely unlikely event, "ImageURL" is a bitmap, it is likely to be base64, so you would need to convert it to a byte array and then to a bitmap. show us the json string (Result = j.GetString)

 

[junaidahmed]

1) this is not an image (or bitmap). if is, presumably, the url where you will find it. you need to go back and download the imabe from its url. just go back with okhttputils2.
2) in the extremely unlikely event, "ImageURL" is a bitmap, it is likely to be base64, so you would need to convert it to a byte array and then to a bitmap. show us the json string (Result = j.GetString)

Can you provide example code to convert image url to byte array in b4A ??

 

[TILogistic]

?

"Data:Image/PNG;Base64,Ivborw0kggoaaaansuheugaabvyaaamacaiaaabaxku...........

'    get data to string
    Dim strImage As String = Map1.Get("ImageURL")
   
'    Delete head data and get base64
    strImage = strImage.Replace("Data:Image/PNG;Base64,", "")
   
'    Convert to image
    Dim bmpImage As B4XBitmap = BytesToImage(SU.DecodeBase64(strImage))
   
'    set image to view
    B4XImageView1.SetBitmap(bmpImage)

Public Sub BytesToImage(bytes() As Byte) As B4XBitmap
    Dim In As InputStream
    In.InitializeFromBytesArray(bytes, 0, bytes.Length)
    #if B4A or B4i
    Dim bmp As Bitmap
    bmp.Initialize2(In)
    #else
    Dim bmp As Image
    bmp.Initialize2(In)
    #end if
    Return bmp
End Sub

 

[junaidahmed]

?

'    get data to string
    Dim strImage As String = Map1.Get("ImageURL")
   
'    Delete head data and get base64
    strImage = strImage.Replace("Data:Image/PNG;Base64,", "")
   
'    Convert to image
    Dim bmpImage As B4XBitmap = BytesToImage(SU.DecodeBase64(strImage))
   
'    set image to view
    B4XImageView1.SetBitmap(bmpImage)

Public Sub BytesToImage(bytes() As Byte) As B4XBitmap
    Dim In As InputStream
    In.InitializeFromBytesArray(bytes, 0, bytes.Length)
    #if B4A or B4i
    Dim bmp As Bitmap
    bmp.Initialize2(In)
    #else
    Dim bmp As Image
    bmp.Initialize2(In)
    #end if
    Return bmp
End Sub

sorry for late reply....
I would like to load image (which is not base64 from api,its only string path for example www.abcd.4634.jpg ) in imageview.
i have tried above code but its showing as "Bad Base64" input

 

[TILogistic]

?
See please

[B4X] OkHttpUtils2 with Wait For

Downloading resources is simpler with the new Resumable Subs feature. Using Wait For we can wait for the JobDone event in the same sub that started the download. No longer is it needed to have a single sub that handles all requests results. Simplest example: Dim j As HttpJob j.Initialize(""...

www.b4x.com

Sub DownloadImage(Link As String, iv As ImageView)
   Dim j As HttpJob
   j.Initialize("", Me)
   j.Download(Link)
   Wait For (j) JobDone(j As HttpJob)
   If j.Success Then
     iv.Bitmap = j.GetBitmap
   End If
   j.Release
End Sub

 

[Andrew (Digitwell)]

or you could use SimpleMediaManager to perform the download and update a placeholder panel..

[B4X] SimpleMediaManager (SMM) - framework for images, videos and more

This is a simple to use, cross platform library, that does many complex things under the hood. The developer calls SetMedia with a placeholder panel and a url. The panel will show an image, video or animated gif (more formats will be added). 'Show a remote image / video / animated gif in...

www.b4x.com