注意，如果你在设备上设置了多个配置文件，你的应用可能已经存在于其他配置文件中。

从所有配置文件中卸载应用程序为我解决了这个问题。

只是做一个干净的构建对我来说很有用。

要进行干净的构建，请执行以下操作:

Build -> Clean Project

然后在设备上进行构建或直接运行。

Had the same error, with a much newer version of Android Studio (version 4.1) . A fresh install of Android Studio + a fresh "basic Activity" template would run into error type 3 for hours. I am on win 10 - my problem was how to kill the gradle cache. A good answer above showed a screen snapshot from gradle, but i didn't find it in Android Studio 4.1. Also the env vars for gradle had not been set , and the commandline for gradle didn't work. So .. here is how it worked finally. I went to C:\Users\myusername\ .gradle. This has subdir "caches". I deleted everything inside. Worked ! I did close Android Studio before, restarted and then it worked nicely. Ah forgot one thing- i run the device emulator (defauöt device), i.e. no physical device yet.

问题是由于在设备仍然插入时卸载应用程序引起的。 设备会禁用应用，而不是删除应用。

进入你设备上的应用程序列表，从那里卸载应用程序。您将看到它当前被标记为禁用。这就是为什么你不能运行应用程序，因为Android Studio无法安装它，因为它认为它已经存在。

我用……来解决这个问题 Edit configuration -> Deploy->选择“default apk” https://i.stack.imgur.com/8xuLG.png

我错误地在androidmenifes .xml中添加了额外的空<application>标签，这导致了这个问题。