Fix non-UI thread call

src/com/annimon/donetskwebcam/WebcamViewerFragment.java

@@ -78,7 +78,13 @@ public class WebcamViewerFragment extends Fragment {
 	}
 	
 	public void update() {
-	    contentImage.setImageDrawable(imageUrl);
+	    contentImage.post(new Runnable() {
+            
+            @Override
+            public void run() {
+                contentImage.setImageDrawable(imageUrl);
+            }
+        });
 	}
 	
 	private void autoUpdate() {