feat(android): implement offscreenPageLimit prop (#290)

Author: troZee

android/src/main/java/com/reactnativecommunity/viewpager/ReactViewPagerManager.java

@@ -141,4 +141,9 @@ public void setPageMargin(ReactViewPager pager, float margin) {
         pager.setPageMargin((int) PixelUtil.toPixelFromDIP(margin));
     }
 
+    @ReactProp(name = "offscreenPageLimit")
+    public void setOffscreenPageLimit(ReactViewPager pager, int offscreenPageLimit) {
+        pager.setOffscreenPageLimit(offscreenPageLimit);
+    }
+
 }

src/types.ts

@@ -104,4 +104,12 @@ export interface ViewPagerProps {
    * Android only
    */
   overScrollMode?: OverScrollMode;
+
+  /**
+   * Android only
+   * Set the number of pages that should be retained to either side of the
+   * current page in the view hierarchy in an idle state. Pages beyond this
+   * limit will be recreated from the adapter when needed.
+   */
+  offscreenPageLimit?: number;
 }