根据这个答案How解决与QUOT;您的APK版本code需要比2＆QUOT较高;在谷歌Play的开发者控制台？我刚换了版本code，从2到3，并将其上传失败的构建。

这是我的老menifest之前上传的APK

 ＆LT;舱单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    包=mypackage的名字
    机器人：INSTALLLOCATION =自动
    安卓版code =28
    机器人：VERSIONNAME =1.0028＆GT;

    ＆LT;用途-SDK
        安卓的minSdkVersion =8
        机器人：targetSdkVersion =19/＆GT;
        .....
 

下面是新版本的code，我要上传的Andr​​oid开发者控制台。见我menifest

 ＆LT;舱单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    包=mypackage的名字
    机器人：INSTALLLOCATION =自动
    安卓版code =2
    机器人：VERSIONNAME =2.0001＆GT;

    ＆LT;用途-SDK
        安卓的minSdkVersion =8
        机器人：targetSdkVersion =19/＆GT;
        ......
 

我不知道什么问题。任何帮助吗？

 安卓版本code =28
 

您previous 版本code 是28.你应该加1到29。

 安卓版本code =29
 

presumably，你的previous的应用程序版本是1到28，与版本code 3释放，你是矛盾与您的应用程序的previous版本已经发布了与这个版本code。

According to this answer How to solve "Your APK's version code needs to be higher than 2." in Google Play's Developer Console? I have just changed the version code from 2 to 3 and it failed to upload the build.

This is my old menifest before upload the apk

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="mypackage name"
    android:installLocation="auto"
    android:versionCode="28"
    android:versionName="1.0028" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
        .....

here is the new version code which I have to upload on android developer console. See my menifest

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="mypackage name"
    android:installLocation="auto"
    android:versionCode="2"
    android:versionName="2.0001" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
        ......

I dont know whats the issue. Any help?

android:versionCode="28"

Your previous versionCode was 28. You should increment it by 1 to 29.

android:versionCode="29"

Presumably, your previous app versions were 1 through 28. By releasing with versionCode 3, you are conflicting with a previous version of your app that was already released with this versionCode.