Check for illegal offset values in ViewPagerAdapter.

tinkoff-mobile-tech · Feb 21, 2018 · e1baf34 · e1baf34
1 parent 9d129bc
commit e1baf34
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/library/src/main/java/ru/tinkoff/scrollingpagerindicator/ViewPagerAttacher.java b/library/src/main/java/ru/tinkoff/scrollingpagerindicator/ViewPagerAttacher.java
@@ -45,7 +45,16 @@ public void onInvalidated() {
 
             @Override
             public void onPageScrolled(int position, float positionOffset, int positionOffsetPixel) {
-                indicator.onPageScrolled(position, positionOffset);
+                final float offset;
+                // ViewPager may emit negative positionOffset for very fast scrolling
+                if (positionOffset < 0) {
+                    offset = 0;
+                } else if (positionOffset > 1) {
+                    offset = 1;
+                } else {
+                    offset = positionOffset;
+                }
+                indicator.onPageScrolled(position, offset);
             }
 
             @Override