React Native WebVIew in Android shows a blank page

Question

I tried to load a HTML page from my local path in Android using React Native's WebView, as follows.

var WebViewAndroid = require('react-native-webview-android');

But I am getting a blank page

 <WebViewAndroid
      ref="webViewAndroidSample"
      javaScriptEnabled={true}
      geolocationEnabled={false}
      builtInZoomControls={false}
      url={webapp}
      style={styles.containerWebView}
       />

my local path is /storage/emulated/0/Android/data/'myappid'/files/abcd/index.html