Unable to scroll pdf file in android app used react-native-pdf

I have used react-native-pdf in my app and we want to scroll that pdf within the app however it is working fine in on ios but in android, it is not scrolling completely scroll up to 4 pages. there are 20 pages in the pdf. I have used the below code in my app:-

render () {
    const source = require('./../../../assets/assets/pdfs/pdfname.pdf');
    return (
      <View style={styles.container}>
          <Pdf
              source={source}
              onLoadComplete={(numberOfPages,filePath)=>{
                  console.log(`number of pages: ${numberOfPages}`);
              }}
              onPageChanged={(page,numberOfPages)=>{
                  console.log(`current page: ${page}`);
              }}
              onError={(error)=>{
                  console.log(error);
              }}
              style={styles.pdf}/>
      </View>
  )

  }
}

const styles = StyleSheet.create({
  container: {
      flex: 1,
      justifyContent: 'flex-start',
      alignItems: 'center',
      marginTop: 5,
  },
  pdf: {
      flex:1,
      width:Dimensions.get('window').width - 20,
  }
});

render () {
    const source = require('./../../../assets/assets/pdfs/ebook_1.pdf');
    return (
      <View style={styles.container}>
          <Pdf
              source={source}
              onLoadComplete={(numberOfPages,filePath)=>{
                  console.log(`number of pages: ${numberOfPages}`);
              }}
              onPageChanged={(page,numberOfPages)=>{
                  console.log(`current page: ${page}`);
              }}
              onError={(error)=>{
                  console.log(error);
              }}
              style={styles.pdf}/>
      </View>
  )

  }
}

const styles = StyleSheet.create({
  container: {
      flex: 1,
      justifyContent: 'flex-start',
      alignItems: 'center',
      marginTop: 5,
  },
  pdf: {
      flex:1,
      width:Dimensions.get('window').width - 20,
  }
});

I expect that my pdf scroll completely within the app.