react native 安卓home返回键页面刷新

import { withNavigationFocus } from 'react-navigation';

class Warngreete extends React.Component {

constructor(props) {
    super(props);

}

componentDidMount() {
   this.reload();
}

componentWillReceiveProps(newProps) {
    if(newProps.isFocused){
        this.reload();
    }
}

//页面执行函数
reload（）{}

}

export default withNavigationFocus(Warngreete);