Posts

• xamarinx SAMember ✭✭

  April 2017

  You can resize the image before display.

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• JonDouglas USXamarin Team, University, Developer Group Leader Xamurai

  April 2017

  There's a whole section of documentation on this topic that you can read over here:

  https://developer.xamarin.com/recipes/android/resources/general/load_large_bitmaps_efficiently/

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• GamalAhmed EGMember ✭✭

  April 2017

  Mohammad Alsoyhri how to resize it ?

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• BerayBentesen TRUniversity ✭✭✭✭

  April 2017

  @GamalAhmed use Glide. It handles large images and also caches for you.

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• GamalAhmed EGMember ✭✭

  April 2017

  @BerayBentesen my app is Send and receive byte array that's converted to Bitmap Image , Do Glide Accepted Byte array or Bitmap Image ? i see that is take URL

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• xamarinx SAMember ✭✭

  April 2017

  put this under MainActivity
  public static readonly int PickImageId = 1000;
  
  like this : 
  public class MainActivity : Activity
      {       
         public static readonly int PickImageId = 1000;
  
  then put these anywhere in Activity : 
  
  protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
          {
              if ((requestCode == PickImageId) && (resultCode == Result.Ok) && (data != null))
              {            
                  var imageView1 = FindViewById<ImageView>(Resource.Id.imageView1);
                  Stream stream = ContentResolver.OpenInputStream(data.Data);
                  imageView1.SetImageBitmap(DecodeBitmapFromStream(data.Data, 150, 150));
                  Bitmap bitmap = BitmapFactory.DecodeStream(stream);
                  MemoryStream memStream = new MemoryStream();
                                             //you can change 60 (100 big size reduce to less >>>>
                  bitmap.Compress(Bitmap.CompressFormat.Jpeg, 60, memStream);
                  byte[] picData = memStream.ToArray();
  
          //picData is byte array you can use it.
              }
          }
  
          private Bitmap DecodeBitmapFromStream(Android.Net.Uri data, int requestedWidth, int requestedHeight)
          {            
              Stream stream = ContentResolver.OpenInputStream(data);
              BitmapFactory.Options options = new BitmapFactory.Options();
              options.InJustDecodeBounds = true;
              BitmapFactory.DecodeStream(stream);
              options.InSampleSize = CalculateInSampleSize(options, requestedWidth, requestedHeight);
              stream = ContentResolver.OpenInputStream(data); //Must read again
              options.InJustDecodeBounds = false;
              Bitmap bitmap = BitmapFactory.DecodeStream(stream, null, options);
              return bitmap;
          }
  
  
          private int CalculateInSampleSize(BitmapFactory.Options options, int requestedWidth, int requestedHeight)
          {
              int height = options.OutHeight;
              int width = options.OutWidth;
              int inSampleSize = 1;
              if (height > requestedHeight || width > requestedWidth)
              {               
                  int halfHeight = height / 2;
                  int halfWidth = width / 2;
                  while ((halfHeight / inSampleSize) > requestedHeight && (halfWidth / inSampleSize) > requestedWidth)
                  {
                      inSampleSize *= 2;
                  }
              }
              return inSampleSize;
          }
  
          then the code of the Button like this : 
   btnimage.Click += delegate {           
              Intent = new Intent();
              Intent.SetType("image/*");
              Intent.SetAction(Intent.ActionGetContent);
              StartActivityForResult(Intent.CreateChooser(Intent, "Select Picture"), PickImageId);
          };
  
  That's All
  

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