How to load react-native-map on android application -

i have below code use react-native-map on android genymotion simulator. , followed instruction https://github.com/lelandrichardson/react-native-maps/blob/master/docs/installation.md setup dependencies. when run react-native run-android, doesn't show ui. instead, shows while page line in middle. able load map on ios device similar code. wrong code android?

import react, {   appregistry,   component,   stylesheet,   text,   view,   image,   listview,   textinput,   touchablehighlight,   dimensions,  //mapview, } 'react-native';  import mapview 'react-native-maps';  const styles = stylesheet.create({   map: {     position: 'absolute',     top: 0,     left: 0,     right: 0,     bottom: 0,   },   container: {     flexdirection: 'row',     justifycontent: 'space-between',     padding: 30,     flex: 1,     alignitems: 'center'   },   inputtext: {     height: 36,       padding: 4,       marginright: 5,       flex: 4,       fontsize: 18,       borderwidth: 1,       bordercolor: '#48bbec',       borderradius: 8,       color: '#48bbec'   } });  class mappage extends component{      constructor(props){         super(props);         this.state = {             region:{                 latitude: 4.21048,                 longitude: 101.97577,             latitudedelta: 10,             longitudedelta: 5             }         }     }      render() {         return(             <view style={styles.container}>                 <textinput style={styles.inputtext}></textinput>                 <mapview                      style={ styles.map }                     maptype={"standard"}                     region={this.state.region}                     zoomenabled={true}                     scrollenabled={true}                     showsscale={true}                   ></mapview>             </view>             )     } }  module.exports = mappage;