unable to load script from assets 'index.android bundle' ,make sure your bundle is packaged corr...

实行命令react-native run-android报以下错误
unable to load script from assets 'index.android bundle' ,make sure your bundle is packaged correctly or youu're runing a packager server

1.先在工作目录创建：android/app/src/main 目录下创建一个 assets空文件夹

2.如果react-native是之前版本，目录下有index.android.js,那么在命令行代码执行以下命令

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/

2.如果react-native是新版本，目录下有index.js和App.js那么在命令行代码执行以下命令

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/

3.再实行react-native run-android命令即可