执行任务“：app：compileDebugJavaWithJavac”失败：

Question

当我在安卓模拟器上尝试执行$ react-native run-android命令时，出现了以下错误：

:app:compileDebugJavaWithJavac
/home/user/app/android/app/src/main/java/com/package/MainApplication.java:8: error: a type with the same simple name is already defined by the single-type-import of RNAWSCognitoPackage
import com.airlabsinc.RNAWSCognitoPackage;
^
1 error
Incremental compilation of 1 classes completed in 0.448 secs.
:app:compileDebugJavaWithJavac FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 10.964 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/getting-started.html

我在/home/user/app/android/app/src/main/java/com/package/MainApplication.java中有两个同名的导入，这会导致问题吗？这是React Native的问题吗？

package com.package;

import android.app.Application;

import com.facebook.react.ReactApplication;
import com.amazonaws.RNAWSCognitoPackage; // 1
import com.amazonaws.amplify.pushnotification.RNPushNotificationPackage;
import com.airlabsinc.RNAWSCognitoPackage; // 2
import com.horcrux.svg.SvgPackage;
import com.toast.ToastPackage;
import com.vdi.VDIPackage;
import com.BV.LinearGradient.LinearGradientPackage;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;

import java.util.Arrays;
import java.util.List;

我的环境：

**Environment**:
  * OS: Linux 4.13
  * Node: 8.9.4
  * Yarn: Not Found
  * npm: 5.6.0
  * Watchman: Not Found
  * Xcode: N/A
  * Android Studio: Not Found

**Packages**: (wanted => installed)
  * react: 16.3.0-alpha.2 => 16.3.0-alpha.2
  * react-native: 0.54.2 => 0.54.2

- Green

---

检查这个答案 https://dev59.com/263la4cB1Zd3GeqPMGWO#51682536 - Jay Thummar

adb devices 的输出是什么？ - Doctor Who

Answer 1

在JAVA中，不能从不同的包中导入相同的类，建议您删除第一个导入：

- import com.amazonaws.RNAWSCognitoPackage; // 1 (remove this line)

- Drea Zener

---

哈哈，我刚看到你在一年半前发布了这个问题:D - Drea Zener

Answer 2

1. 删除 Android 文件夹中的 build 文件
2. 删除 android>app 中的 build 文件
3. 运行 react-native run-android

- Zaid Raddad

Answer 3

不确定这是否是正确的解决方案。你能试一下吗！

1. 在Android Studio中打开您的项目。转到文件菜单，然后单击无效缓存/重启。
2. 重新构建您的项目。
3. 执行npm run android或react-native run-android

- Prameela K

Answer 4

有几种可能性，请尝试哪一种适合，

1. 你可能错过了RNAWSCognitoPackage包及其相关服务的一些初始设置。因此，请检查安装设置。

2. 如果一切正常，那么另一个情况是，Android会存储缓存以加快构建速度。每次安装新包时，您都应该清除代码并重新运行它。

   删除node_modules和Package-lock.json文件，并运行以下命令：

   cd android
   
   ./gradlew clean
   
   ./gradlew cleanBuildCache
   
   npm install

有些罕见情况下，你需要尝试这个。

npx react-native-clean-project clean-project-auto

- Dhevendhiran M