“react-native run-android"- 构建成功但得到错误类型 3 错误:活动类 MainActivity 不存在 [英] "react-native run-android" - BUILD is SUCCESSFUL but get error type 3 Error: Activity class MainActivity does not exist

问题描述

我尝试在 android 模拟器上运行应用程序，但失败了.我运行 react-native run-android，BUILD 成功，但我收到错误类型 3，我没有看到它安装在模拟器上.

I try to run application on android emulator but it failed. I run react-native run-android, BUILD is SUCCESSFUL but I get error type 3 and I don't see that it installed on emulator.

当我在 cmd 中运行react-native run-android"时我得到的这部分内容:

This part of what I get when I run "react-native run-android" in cmd:

Installed on 1 device.

BUILD SUCCESSFUL

Total time: 2 mins 24.714 secs
Starting the app on ***** (...\Android\sdk/platform-tools/adb -s **** shell am start -n app/.MainActivity)...
Starting: Intent { cmp=app/.MainActivity }
Error type 3
Error: Activity class {app/app.MainActivity} does not exist.

推荐答案

Step 1 : 检查以下文件是否有相同的包名，如com.companyName.appName":

Step 1 : Check whether the following files have the same package name say "com.companyName.appName":

1. package (usually line 2) in /android/app/src/main/AndroidManifest.xml
2. applicationId (usually line 90) in defaultConfig section of /android/app/build.gradle
3. Line 1 of /android/app/src/main/java/com/paysack/MainApplication.java
4. Line 1 of /android/app/src/main/java/com/paysack/MainActivity.java

第 2 步:

react-native run-android

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