Installing and preparing to work with the Ionic CLI:

    ```
    $ npm install -g ionic cordova
    $ npm install
    ```

Remove platform, if it's already installed:

    ```
    $ ionic cordova platform remove android
    ```

1. Install plugins play-services-gradle-release, firebase-gradle-release, googlemaps phonegap-plugin-push and crosswalk-webview strictly using these commands:

   ```
   $ ionic cordova plugin add cordova-android-play-services-gradle-release --variable PLAY_SERVICES_VERSION=15.+
   $ ionic cordova plugin add cordova-android-firebase-gradle-release  --variable FIREBASE_VERSION=15.+
   $ ionic cordova plugin add cordova-plugin-googlemaps --variable API_KEY_FOR_ANDROID="AIzaSyAKDQzb3RKdVlh0gqZMhY4MEjl53Lh-Dmk" --variable API_KEY_FOR_IOS="AIzaSyAKDQzb3RKdVlh0gqZMhY4MEjl53Lh-Dmk" --variable PLAY_SERVICES_VERSION=15.+
   $ ionic cordova plugin add phonegap-plugin-push@2.2.2 --variable SENDER_ID=431639834815 --variable FCM_VERSION=15.+
   $ ionic cordova plugin add cordova-plugin-crosswalk-webview
   ```

Then:

    ```
    $ ionic cordova platform add android@7.1.0
    ```

When platform is installed copy google-services.json file from project's root folder to platforms/android/app.

Now build with:

    $ ionic cordova build android --aot

or run on device/emulator:

    $ ionic cordova run android --aot --device

If you're experiencing build errors like "ERROR: In FontFamilyFont, unable to find attribute ..." read crosswalk_fix.md which is located in project's root folder to fix issue with crosswalk-webview plugin.