对我来说，./gradlew assemblerrelease不再工作，但下面的可以。

./gradlew :app:assembleRelease

感谢这条评论。

只有这对我有用- yarn android -variant=release

如果您得到“Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES].”

我尝试使用@Aditya的方法来生成一个无签名APK文件并安装它，但当我在我的Android平板电脑上安装它时，它给了我一个失败的错误[INSTALL_PARSE_FAILED_NO_CERTIFICATES]。

我想这是因为APK文件没有签名，平板电脑对此不满意。所以，在生成React Native包文件后，我能够通过Android Studio生成一个签名的APK文件。

顺便说一句，我们的应用是一款功能齐全的Android应用，已经在Play Store中存在，我们只是将React Native添加到它中，因为它很棒。

总结一下，我的步骤如下:

1)生成React Native包:

react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/<your-package-name>/src/main/assets/index.android.bu‌​ndle --assets-dest android/<your-package-name>/src/main/res/ 

2)从Android Studio生成一个Signed APK文件。

3)将签名APK文件安装到USB设备:

adb -d install -r <path_to_signed_apk> 

-d标志只是告诉adb在附加的usb设备上安装，如果您有一个模拟器也在运行。如果你想在任何模拟器上安装，去掉-d标志。

4)利润!

第一个

cd android

然后运行

./gradlew installRelease

最后你将能够在这里找到apk。

Project\android\app\build\outputs\apk\release\app-release.apk

React Native 0.49及以上版本

你应该在终端的工程目录下运行这个命令

1 - mkdir android/app/src/main/assets
2 - react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

如果低于0.49

  1 - mkdir android/app/src/main/assets
  2 - react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

然后使用android studio在你的react原生应用目录中打开“android”文件夹，它会要求升级gradle和其他一些东西。去build->生成签名APK，并按照那里的指示。那好。

Android Studio中的GUI方式

Have the Android app part of the React Native app open in Android Studio (this just means opening the android folder of your react-native project with Android Studio) Go to the "Build" tab at the top Go down to "Build Bundle(s) / APK(s)" Then select "Build APK(s)" This will walk you through a process of locating your keys to sign the APK or creating your keys if you don't have them already which is all very straightforward. If you're just practicing, you can generate these keys and save them to your desktop. Once that process is complete and if the build was successful, there will be a popup down below in Android Studio. Click the link within it that says "locate" (the APK) That will take you to the apk file, move that over to your android device. Then navigate to that file on the Android device and install it.