在Android Studio中,我使用密钥库生成了已签名的APK,依此类推.将APK安装到设备上时失败并显示“无法安装应用程序”,而在Android监视器中,我看到以下行：

Package com.my.app has no certificates at entry AndroidManifest.xml; ignoring!

有人知道什么是错的吗？

解决方法:

Try to signed your APK with version 1. Version 2 signed APK only
compatible from 7.0 so it will not working on below 7.0 devices or try
to generate v1 and v2 version APK.

[ Note: When you generate signed apk for above 7.0 devices and below 7.0 devices then please check v1 and v2 both option. ]

这是reference link for more about V2 version,这是link for overview.

试试这个,您的问题将得到解决.