Update PreviewImpl.java

camerakit/src/main/base/com/flurgle/camerakit/PreviewImpl.java

@@ -61,10 +61,12 @@ abstract class PreviewImpl {
         return mHeight;
     }
 
-    void setTruePreviewSize(int width, int height) {
+    void setTruePreviewSize(final int width, final int height) {
         this.mTrueWidth = width;
         this.mTrueHeight = height;
-
+        ((Activity) getView().getContext()).runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
                 if (width != 0 && height != 0) {
                     AspectRatio aspectRatio = AspectRatio.of(width, height);
                     int targetHeight = (int) (getView().getWidth() * aspectRatio.toFloat());
@@ -84,6 +86,8 @@ abstract class PreviewImpl {
                     }
                 }
             }
+        });
+    }
 
     int getTrueWidth() {
         return mTrueWidth;