diff --git a/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java b/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
index 7057807..8c4ca79 100644
--- a/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
@@ -98,7 +98,10 @@
     @Override
     public void onClick(View v){
         if(v.getId() == R.id.okButtton) {//okButtonが押されたときの処理
-            Bitmap bitmap = null;
+//            Bitmap bitmap = null;
+            drawingCanvas.setDrawingCacheEnabled(true);
+            drawingCanvas.buildDrawingCache();
+            Bitmap bitmap = Bitmap.createBitmap(drawingCanvas.getDrawingCache());
             drawingStateViewModel.putDrawing(bitmap);
         }else if(v.getId() == R.id.clearButton){//clearButtonが押されたときの処理
             drawingCanvas.clearCanvas();