Null safety

1 files changed, 6 insertions, 3 deletions

diff --git a/sample/src/main/java/com/davemorrissey/labs/subscaleview/test/imagedisplay/ImageDisplayRegionFragment.java b/sample/src/main/java/com/davemorrissey/labs/subscaleview/test/imagedisplay/ImageDisplayRegionFragment.java
index 5e6b1c8..566e144 100644
--- a/sample/src/main/java/com/davemorrissey/labs/subscaleview/test/imagedisplay/ImageDisplayRegionFragment.java
+++ b/sample/src/main/java/com/davemorrissey/labs/subscaleview/test/imagedisplay/ImageDisplayRegionFragment.java
@@ -29,9 +29,12 @@ public class ImageDisplayRegionFragment extends Fragment {
         imageView.setRegionDecoderFactory(new CompatDecoderFactory<ImageRegionDecoder>(SkiaImageRegionDecoder.class, Bitmap.Config.ARGB_8888));
         imageView.setOrientation(SubsamplingScaleImageView.ORIENTATION_90);
         imageView.setImage(ImageSource.asset("card.png").region(new Rect(5200, 651, 8200, 3250)));
-        rootView.findViewById(id.previous).setOnClickListener(new View.OnClickListener() {
-            @Override public void onClick(View v) { ((ImageDisplayActivity) ImageDisplayRegionFragment.this.getActivity()).previous(); }
-        });
+        final ImageDisplayActivity activity = (ImageDisplayActivity)getActivity();
+        if (activity != null) {
+            rootView.findViewById(id.previous).setOnClickListener(new View.OnClickListener() {
+                @Override public void onClick(View v) { activity.previous(); }
+            });
+        }
         rootView.findViewById(id.rotate).setOnClickListener(new View.OnClickListener() {
             @Override public void onClick(View v) { imageView.setOrientation((imageView.getOrientation() + 90) % 360); }
         });