我今天遇到了类似的问题，起初我以为是我的sd卡损坏了它。我在许多运行android 4.4及更高版本的设备上尝试了它，但它一直带来同样的问题。经过一些谷歌和研究，我意识到我没有选择v1 jar签名，这是设备比android 7.0牛轧糖，所以我应用了这两个签名，通过选择两个复选框，并生成了一个签名的apk，它工作。

链接到解决方案Android -应用程序未安装错误时，安装签名APK -如何修复

检查Android版本。

如果你安装的是非市场应用程序，和不兼容的版本，你会得到这个错误。

应用程序的目标是2.3.4 您的设备是2.2 然后你会得到这个错误。

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! !

这也可能发生在制作主屏幕小部件时，并且您的小部件XML文件在其android:configure属性中指定了错误的Activity。

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.