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。

我也遇到了同样的问题，下面是解决方法:转到Manifest文件，确保你有“Debuggable”和“Test Only”属性设置为false。这对我很有用:)

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。

我也面临着同样的问题。问题是我的AndroidManifest.xml文件中的主要活动写了两次。我删除了副本。

I had a similar situation.I was able to install app in debug mode using USB but not a signed version. I was able to install signed version on other phone, but not on my device. Numerous reasons and solutions did not help me. But one direction I got from a solution "uninstall for all users". What I did is to again install app in debug mode using USB connection, go to app details and "uninstall for all users" from right top 3 dots - to remove debug version. This looks like cleared all kinds of references. I usually do a normal uninstall.

现在我能够在设备上获得签名APK并成功安装。

我也遇到过这个问题。 请尝试这个解决方案。确保您的项目的包名称不同于您的移动电话中已经安装的以前的项目。我觉得他们的名字有冲突。它在我身上起作用。