一般服务器会返回最新的apk版本，格式为1.x.x，前端拿到后跟自己的版本号对比，如果我们的版本号小于最新的，就会弹出更新弹窗。
1、将版本号转为数字进行对比

function handlerVersionString(version) {
    let versions = version.split('.');
    let number = 0;
    if (versions.length === 3) {
        number = parseInt(versions[0]) * 10000 + parseInt(versions[1]) * 100 + parseInt(versions[2])
    } else {
        number = parseInt(versions[0]) * 10000 + parseInt(versions[1]) * 100
    }
    return number;
}

2、进行对比，用到DeviceInfo库，安卓APP升级用到的是rn-app-upgrade库。

import DeviceInfo from 'react-native-device-info';
import {upgrade} from 'rn-app-upgrade';


//安卓检查更新

state={
         showModal:false,
}

componentDidMount() {
store.get('lastVST').then((lastTime)=>{
               if(lastTime){
                   //对比上次显示时间  如果超过24小时就显示
                   let now = new Date()
                   let diff = now.getTime() - parseInt(lastTime)
                   console.log('上次提示时间',lastTime)
                   console.log('距离上次提示时间间隔',diff)
                    if( diff > 3600 * 24 * 1000 ){
                        this.checkAppVersion()
                    }
               }else{
                   this.checkAppVersion()
               }
           })
}
          


checkAppVersion(){

       const version = handlerVersionString( DeviceInfo.getVersion() )
       //服务器返回的版本号 remoteAppVersion 比如1.2.0
       if(handlerVersionString(remoteAppVersion) > version){

           this.versionDialog.current.show(data,()=>{
               if(Platform.OS === 'android'){
                 
                   upgrade(data.download_url)
               }else{
                 //如果是iOS则跳转到Apple store应用商店，代码忽略
               }
           })

       }
   }


render(){
   <>
   ....
//更新弹窗
<NewVersion
                   show={showModal}
                   data={versionData}
                   onCancel={()=>{
                       //记录一下当前时间lastVersionShowTime  防止每次都提示
                       let date = new Date()
                       store.save('lastVST',date.getTime())
                       this.setState({
                           showModal:false
                       })
                   }}
                   onConfirm={()=>{
                       //记录一下当前时间lastVersionShowTime  防止每次都提示
                       let date = new Date()
                       store.save('lastVST',date.getTime())
                       upgrade(versionData.download_url)
                   }}
               />
<>
}