错误类型3错误:活动类{}不存在

我有一个IntelliJ Android项目，我成功地导入到Android Studio 0.4.0。如果我不改变manifest中的任何东西，它就能很好地工作。然而，当我想要改变启动器活动并运行时，它会失败，并出现以下错误:

Launching application: com.trackingeng/LandingActivity.
DEVICE SHELL COMMAND: am start -D -n "com.trackingeng/LandingActivity"  
    -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN  
    cat=[android.intent.category.LAUNCHER] cmp=com.trackingeng/LandingActivity }
Error type 3
Error: Activity class {com.trackingeng/LandingActivity} does not exist.

当我点击同步项目与Gradle文件，它输出:

Project Sync
The project 'TrackingEng' is not a Gradle-based project

运行设置:

当前回答

禁用Android Studio的即时运行(在2.1.1版本上测试)

2016-06-03 05:46:44

其他回答

对我来说，问题在于AndroidStudio认为应用还在设备上。

解决方法:

重新启动adb守护进程;在终端或命令提示符中输入: 亚行kill-server 亚洲开发银行启动服务器尝试启动你的应用程序。如果还是不行，看看这个答案。

确保Android SDK的平台工具添加到你的系统路径变量中!

2015-12-20 18:55:13

Gradle ->任务->安装->全部卸载。

2020-07-24 19:17:36

我参考了@jayeffkay的评论:

我必须删除gradle缓存，正如这里所描述的，Android Studio在运行.apk时得到错误的包名

它为我工作后，我删除gradle缓存文件位于:

/your_proj_directory/.gradle/2.10

2.10是我使用的gradle版本。

2016-05-17 07:12:18

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.

2020-10-14 15:58:57

发生在我改变应用程序名称时。卸载app，从调试版本切换到发布版本，安装发布版本，然后切换回调试版本并工作。

2021-09-12 08:47:14

错误类型3错误:活动类{}不存在

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