如果您试图直接从谷歌驱动器安装apk，只需重新启动设备就可以为我解决问题。

确保考虑到以下建议:

Your build variants and Flavors should be same(App installed and new one), usually release Signature file must be the same(*.jks file) The version you set in build.gradle or AndroidManifest have greater value compared to current version(it is recommended to set version in build.gradle) URL is correct(doesn't have typo) and server is reachable(WebService/WebMethod/WIFI is running/available and ...) File downloaded completely File saved correctly into desired directory Setting for Data and Type in setDataAndType is correct

如果应用程序已经安装到或移动到SD卡上，然后连接了USB线，导致SD卡卸载，也会出现“应用程序未安装”错误。

在这种情况下，关闭USB存储或将应用程序移回内部存储可以解决这个问题。

我有同样类型的错误，这是由我的android manifest XML文件中的这一行引起的。

android:permission="android.permission.INSTALL_LOCATION_PROVIDER"

我去掉了那条线，问题就解决了。希望这能有所帮助

Clearly there are many causes of this problem. For me the situation was this: I had deployed to my nexus 7 (actual device) from within the Android Studio (v1.3.2). All worked fine. I then created a signed apk and uploaded to my Google Drive. After disconnecting my nexus from the usb, I went to the settings/apps and uninstalled my app (App1). I then opened google drive and clicked on my App1.apk and chose to install it (need to ensure you have allowed installation of apks in settings). Then I got the dreaded message "App not Installed"

Solution for me: go back into settings/apps and scroll though all apps and at the bottom was a pale version of my App1 (note the original App1 was at the top in Alphabetical order which was deleted as above). When clicking on the pale version it said "Not installed for this user". (I had set up my nexus to have more than one user). But in the top right corner there is a three dot button. I pressed this and it said "Uninstall for all users". Which I did and it fixed the problem. I was now able to click on App1.apk and it installed fine without the error.

在我的情况下，我之前发布的应用程序已经通过另一个密钥签名，所以我已经卸载了它，但在我的测试手机(LG G4 H-818) 2个用户存在，所以之前的应用程序仍然安装在我的手机上，没有正确卸载!所以当我试图重新安装它时，它失败了…

所以我试图改变用户和卸载之前的应用程序，最终应用程序安装正确。

希望这对你将来有所帮助:)