--- a/app/src/main/java/com/bartsent/simpleresizer/EditImage.kt	Wed Feb 17 07:24:26 2021 -0800
+++ b/app/src/main/java/com/bartsent/simpleresizer/EditImage.kt	Wed Feb 17 13:20:25 2021 -0800
@@ -12,7 +12,9 @@
 import android.provider.OpenableColumns
 import android.view.MenuItem
 import android.view.View
+import android.view.Window
 import android.widget.EditText
+import android.widget.ProgressBar
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.PopupMenu
@@ -20,6 +22,7 @@
 import com.bartsent.simpleresizer.lib.getScaledInstance
 import java.io.File
 import java.io.IOException
+import kotlin.concurrent.thread
 import kotlin.math.roundToInt
 
 class EditImage : AppCompatActivity() {
@@ -140,11 +143,16 @@
         if (factor >= 1.0) {
             throw IllegalArgumentException("can only scale down")
         }
-        val newBitmap = Bitmap.createBitmap((oldBitmap.width * factor).roundToInt(), (oldBitmap.height * factor).roundToInt(), oldBitmap.config)
-        copyColorSpace(oldBitmap, newBitmap)
-        setImage(oldBitmap.getScaledInstance(
-                (oldBitmap.width.toDouble() * factor + 0.5).toInt(),
-                (oldBitmap.height.toDouble() * factor + 0.5).toInt()))
+        binding.progressBar.visibility = ProgressBar.VISIBLE
+        thread {
+            val newBitmap = oldBitmap.getScaledInstance(
+                    (oldBitmap.width.toDouble() * factor + 0.5).toInt(),
+                    (oldBitmap.height.toDouble() * factor + 0.5).toInt())
+            runOnUiThread {
+                binding.progressBar.visibility = ProgressBar.INVISIBLE
+                setImage(newBitmap)
+            }
+        }
     }
 
     // is there any way to remember the last scale value?
@@ -215,10 +223,16 @@
             setRotate(deg.toFloat(), oldBitmap.width.toFloat()/2.0f, oldBitmap.height.toFloat()/2.0f)
             postTranslate((w - oldBitmap.width).toFloat()/2.0f, (h - oldBitmap.height).toFloat()/2.0f)
         }
-        Canvas(newBitmap).run {
-            drawBitmap(oldBitmap, rotater, null)
+        binding.progressBar.visibility = ProgressBar.VISIBLE
+        thread {
+            Canvas(newBitmap).run {
+                drawBitmap(oldBitmap, rotater, null)
+            }
+            runOnUiThread {
+                binding.progressBar.visibility = ProgressBar.INVISIBLE
+                setImage(newBitmap)
+            }
         }
-        setImage(newBitmap)
     }
 
      fun cancelClicked(view: View): Unit {