Answers

• ChristopheBERNARD BEMember ✭✭✭✭✭

  February 2018

  Hello @enohara,
  for me , you need to try to convert the sample in java in c# that's a good exercice for you and for the futur you'll see often when we meet a problem you'll find a solution perhpas in java ...
  it's my opinion ...

  now, nothing found about this ...but try the sample in java and if you meet some problem post it here ...
  i will help you ..

  1
• Xammy10 Member ✭✭✭

  February 2018

  @ChristopheBERNARD thanks for the advice sir,
  I already get the flow of saving on JAVA/Android studio.

  I need to convert my image to byte array / base64, then save it to my SQLite database.
  and when it comes to retrieving, I'll get the Base64string file android convert it to bitmap.

  But I can't find a codes for android xamarin when it comes to converting android retrieving.
  I tried searching but most of the results are also Java/android studio.

  I found some in converting but most of it are in C# (Windows form) and I can't convert it to xamarin android.

  Here Sir:
  https://stackoverflow.com/questions/18827081/c-sharp-base64-string-to-jpeg-image
  https://stackoverflow.com/questions/36973960/convert-base64-string-to-bitmap-or-image-xamarin-or-android

  I already know the procedure, but I still don't know the codes.

  Hope you help me with this Sir. Thanks Again

  0
• ChristopheBERNARD BEMember ✭✭✭✭✭

  February 2018

  Try this and insert it into sql lite

  `

  public static string ConvertBitmapToString(Bitmap theBitmap)
  {
  string strImage = string.Empty;
  using (var stream = new System.IO.MemoryStream())
  {
  theBitmap.Compress(Bitmap.CompressFormat.Png, 25, stream);
  var bytes = stream.ToArray();
  strImage = Convert.ToBase64String(bytes);
  }

          return strImage;
      }
  
      public static Bitmap ConvertStringToBitmap(string theBitmap)
      {
          Bitmap img = null;
  
          if (theBitmap != null)
          {
              byte[] decodedByte = Android.Util.Base64.Decode(theBitmap, 0);
              img = BitmapFactory.DecodeByteArray(decodedByte, 0, decodedByte.Length);
  
          }
  
          return img;
      }
  

  `

  1
• Xammy10 Member ✭✭✭

  February 2018 edited February 2018

  @ChristopheBERNARD said:
  Try this and insert it into sql lite

  `

  public static string ConvertBitmapToString(Bitmap theBitmap)
  {
  string strImage = string.Empty;
  using (var stream = new System.IO.MemoryStream())
  {
  theBitmap.Compress(Bitmap.CompressFormat.Png, 25, stream);
  var bytes = stream.ToArray();
  strImage = Convert.ToBase64String(bytes);
  }

          return strImage;
      }
  
      public static Bitmap ConvertStringToBitmap(string theBitmap)
      {
          Bitmap img = null;
  
          if (theBitmap != null)
          {
              byte[] decodedByte = Android.Util.Base64.Decode(theBitmap, 0);
              img = BitmapFactory.DecodeByteArray(decodedByte, 0, decodedByte.Length);
  
          }
  
          return img;
      }
  

  `

  I'll give it a try Sir, thank you for this.
  I'll inform you if it's working ))))

  0
• terzy Member ✭✭

  November 2018

  @Enohara
  You havent give a update on this.
  I have the same problem have searched for days and cant find a good solution

  0
• terzy Member ✭✭

  November 2018

  And one part more.

  When you have the method

  how do i but the image into the method, for me it just say i have inserted a integer

  ConvertBitmapToString(Resorce.drawing.item)

  0
• DimChris USMember ✭✭✭✭

  November 2018

  If you have to handle big images, it is better(i think...) to save your images inside mobile storage. And when you need your image, retreive it from a storage path.

  Example

  First step - Save image name in sqlite(or full path) then save your image to this path
  Second step - Select image name(or full path) from sqlite, and show it inside an imageview...

  2