Add Padding to Android.Graphics.Bitmap

Question

I have an Android.Graphics.Bitmap that I want to resize by adding padding to the right and/or bottom. I do not want to scale the Bitmap, so I cannot use Bitmap.CreateScaledBitmap. Is there any simple way to do this?

Answer 1

Hello,

If you want to add right and bottom padding to the Bitmap, you need to create a new Bitmap, add the bigger width and height (it depends on your padding's size), then use Canvas to draw it in the top-left corner.

Here is demo code.

   private Bitmap AddRightAndBottomPaddingForBitmap(Bitmap Orignalbitmap, int paddingSize)  
           {  
               //I add padding for right and bottom at the same time, if you just want to add right bottom, please use `Orignalbitmap.Height` directly.  
               Bitmap bmpWithPadding = Bitmap.CreateBitmap(Orignalbitmap.Width + paddingSize, Orignalbitmap.Height + paddingSize, Orignalbitmap.GetConfig());  
               Canvas canvas = new Canvas(bmpWithPadding);  
               canvas.DrawColor(Color.White);  
               //draw it in the top-left corner  
               canvas.DrawBitmap(Orignalbitmap, 0 ,0, null);  
              return bmpWithPadding;  
           }  

Best Regards,

Leon Lu

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