How can I generate apk file for create-react-native-app (using EXPO.IO component)

1. Install expo cli globally npm install -g exp
2. Run exp build:android or exp build:ios inside the project
3. Choose some expo options
4. Wait few minutes

A build link should be printed in the terminal. For the next steps see this thread: Created an app with create-react-native-app, how to publish it to the Google Play Store?

1. Install npm install -g exp

2. edit app.json file in our project

   {
   "expo": {
   "name":"my app",
   "icon":"./logo.png",
   "description":"some description about our project",
   "sdkVersion": "27.0.0",
   "android":{
        "package":"com.johncy.myapp",
         "versionCode":1 , 
         "icon":"./logo.png"
             }
            }
   }
   

3. give the command in our project directory exp build:android

4. Just wait for few mins.It will give an url for our build project.We can download *.apk file from that link.