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:)

我曾以各种形式遇到过这个问题，但这一次是一个新的问题:

在这种情况下，我有提供商名称冲突-相同的提供商名称存在于我的应用程序和我的另一个应用程序。

最后我发现没有一个应用程序被成功安装，不仅仅是我的。我将SD卡默认的安装应用程序设置为自动。这就解决了问题。

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.

我知道这是一个老帖子，但对新用户可能有用。我也遇到了同样的问题:我的应用程序在调试时工作得很好。当我签署APK时，我得到了同样的消息:“应用程序未安装”。

我修复了卸载JDK(我使用的是JDK -6u14-windows-x64)并安装了一个新的JDK (JDK -6u29-windows-x64)。导出并再次签署APK后，一切正常!

恢复，我的问题是在JAVA版本。谢谢的甲骨文! !

尝试在AndroidManifest.xml中进行更改:

设置debuggable为true 签署apk