Merge pull request #789 from fungilation/master

fixes #582 (Android not setting this onLayout first?)

Author: Bart Arribe

examples/android/gradlew

@@ -394,6 +394,8 @@ export default class extends Component {
   updateIndex = (offset, dir, cb) => {
     const state = this.state
     let index = state.index
+    if (!this.internals.offset)   // Android not setting this onLayout first? https://github.com/leecade/react-native-swiper/issues/582
+      this.internals.offset = {}
     const diff = offset[dir] - this.internals.offset[dir]
     const step = dir === 'x' ? state.width : state.height
     let loopJump = false