小米4A安装App报错INSTALL_FAILED_VERSION_DOWNGRADE

朱雀 2022-06-07 11:48 755阅读 0赞

### 问题 ###

这两天用小米手机debug，完全卸载之后发现总是报错`INSTALL_FAILED_VERSION_DOWNGRADE`或者`INSTALL_FAILED_ALREADY_EXISTS`，

![这里写图片描述][20171020143723588]

AS的命令行中显示：`Unknown failure (Failure - not installed for 0) Error while Installing APKs`

![20171020142218438][]

按理说应用已经卸载了，很是奇怪，不论是从应用商店下载的线上App，还是重新打包好的均无法安装。证明肯定是卸载有残留。

首先使用adb查看安装包列表

adb shell pm list packages | grep 'com.example.myapp'

发现已经不存在了，证明真的是卸载了，愈发奇怪了。

然后想到报错说`INSTALL_FAILED_VERSION_DOWNGRADE`，也就是想要安装的App版本比之前卸载的版本要低，所以想使用adb查看VersionCode，果然发现有端倪。使用以下命令查看安装包versionCode，注意把其中的my.package换成自己的包名

adb shell dumpsys package my.package | grep versionCode

显示versionCode=90990095，如下图：

![20171020105159926][]

弹出删除对话框，也删除不了：

adb shell am start -a android.intent.action.DELETE -d package:com.sogou.map.android.maps

### 解决 ###

两种方法：

1.  在手机中禁止MIUI优化  
    设置->更多设置->开发者选项->启用MIUI优化，选择关闭，重启手机
2.  在Android studio的设置中禁止Instant Run  
    File->Settings->Build, Execution, Deployment->Instant Run(把最上面的勾去掉)

### 参考资料 ###

*  [Android app installation: Unknown failure (Failure - not installed for 0)][Android app installation_ Unknown failure _Failure - not installed for 0]
 *  [Application Installation Failed in Android Studio][]
 *  [adb shell command to make Android package uninstall dialog appear][]
 *  [小米手机安装apk时 Unknown failure (Failure - not installed for 0) Error while Installing APKs][apk_ Unknown failure _Failure - not installed for 0_ Error while Installing APKs]

[20171020143723588]: /images/20220607/c510240f30894b19a526c90df675b86c.png
[20171020142218438]: /images/20220607/e27f090334dc46988d4296c9915b000d.png
[20171020105159926]: /images/20220607/32685f9c47e84c93b346338a05d02ca4.png
[Android app installation_ Unknown failure _Failure - not installed for 0]: https://stackoverflow.com/questions/43077518/android-app-installation-unknown-failure-failure-not-installed-for-0
[Application Installation Failed in Android Studio]: https://stackoverflow.com/questions/42687607/application-installation-failed-in-android-studio
[adb shell command to make Android package uninstall dialog appear]: https://stackoverflow.com/questions/12949609/adb-shell-command-to-make-android-package-uninstall-dialog-appear
[apk_ Unknown failure _Failure - not installed for 0_ Error while Installing APKs]: http://blog.csdn.net/qq_18824545/article/details/71167190