Android Question Show picture in imageview

Blue.Sky · Oct 7, 2015

Hi
I have a rss reader that load picture in imageview
I have a problem
Any picture is different sizse,example 320x430 or 800x420
Now when i show it in imageview,if gravity is fill so picture bad shown
if gravity center,the big picture is over than imageview
How i show any picture in imageview with different size?

Ohanian · Oct 7, 2015

Hi,

try this :

B4X:

ImageView.Gravity = Bit.OR(Gravity.CENTER, Gravity.FILL)

eurojam · Oct 7, 2015

You should calculate the aspect ratio of the image and then resize the imageview.

Blue.Sky · Oct 7, 2015

eurojam said:
You should calculate the aspect ratio of the image and then resize the imageview.

No tired.How can i calculate the aspect?is there example?

eurojam · Oct 7, 2015

just coded not tested, but something like this

B4X:

    Dim b As Bitmap
    Dim bW, bH As Int 'Imagesize
    Dim a As Double
    Dim iView As ImageView
    b.Initialize(File.DirAssets,"test.png")
    bW = b.Width
    bH = b.Height
    a = bH/bW 'aspect factor
    iView.Initialize("iV")
    Activity.AddView(iView,0,0, 100dip, a*100dip)  'width is fix and height is calculated with aspect
    iView.Bitmap=b

Ohanian · Oct 7, 2015

Hi,

B4X:

    Dim bmpImage As Bitmap
    Dim imgImage As ImageView   
    Dim bmpEx As BitmapExtended
    Dim LayoutVal As LayoutValues

    LayoutVal = GetDeviceLayoutValues 
   
    bmpImage.InitializeSample(File.DirAssets, "image.jpg", LayoutVal.Width, LayoutVal.Height)
               
    Dim dScale As Double
    dScale = (bmpEx.getHeight(bmpImage) * 100) / bmpEx.getWidth(bmpImage)
    dScale = dScale / 100

    imgImage.Initialize("")
    imgImage.Gravity = Bit.OR(Gravity.CENTER, Gravity.FILL)
    imgImage.Bitmap = bmpImage
   
    Activity.AddView(imgImage, 0, 0, 100%x, (100%x * dScale))

Blue.Sky · Oct 7, 2015

Ohanian said:

Hi,

B4X:

    Dim bmpImage As Bitmap
    Dim imgImage As ImageView  
    Dim bmpEx As BitmapExtended
    Dim LayoutVal As LayoutValues

    LayoutVal = GetDeviceLayoutValues
  
    bmpImage.InitializeSample(File.DirAssets, "image.jpg", LayoutVal.Width, LayoutVal.Height)
              
    Dim dScale As Double
    dScale = (bmpEx.getHeight(bmpImage) * 100) / bmpEx.getWidth(bmpImage)
    dScale = dScale / 100

    imgImage.Initialize("")
    imgImage.Gravity = Bit.OR(Gravity.CENTER, Gravity.FILL)
    imgImage.Bitmap = bmpImage
  
    Activity.AddView(imgImage, 0, 0, 100%x, (100%x * dScale))

Thank you.
I added Imageview already with size 200 and 400
I force use imageview with size 200 and 400 because UI designed.
How use "imgImage, 0, 0, 100%x, (100%x * dScale)" for bitmap?

klaus · Oct 7, 2015

You may have a look at this thread.

Blue.Sky · Oct 8, 2015

It's Solved.
I use Picaso in my library.
It is good library for center or resize or crop picture in imageview

carycai · Apr 18, 2017

Blue.Sky said:
It's Solved.
I use Picaso in my library.
It is good library for center or resize or crop picture in imageview

Could you share the Picaso library?
Many thanks.

Android Question Show picture in imageview

Blue.Sky

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