This is ionic 2 demo app 1. Change the app scripts in node_modules, if node_modules is installed first time, deleted or reinstalled copyImages: { src: ['{{SRC}}/assets/img/*'], dest: '{{WWW}}/build/img' } 2. Google maps Generate APi Keys for android and ios on Google console version 1.4.0 since latest can not be downloaded from github ionic plugin add cordova-plugin-googlemaps --variable API_KEY_FOR_ANDROID="AIzaSyB7mM5Y029hI78L0sZDwNy7AKi6JR2wU7Q" --variable API_KEY_FOR_IOS="AIzaSyBYbqjiQu55yZtNyNvgDRruZFfM_h2gcfU" --save

Latest release: 
https://github.com/mapsplugin/cordova-plugin-googlemaps

For remove plugin: 
ionic plugin remove cordova-plugin-googlemaps
ionic plugin remove com.googlemaps.ios

for android, project.properties should be like following
target=android-24
android.library.reference.1=CordovaLib
cordova.system.library.1=com.google.android.gms:play-services-maps:+
cordova.system.library.2=com.google.android.gms:play-services-location:+
cordova.gradle.include.1=cordova-plugin-mauron85-background-geolocation/locationtrace-logtofile.gradle
cordova.system.library.3=com.google.android.gms:play-services-location:+
cordova.system.library.4=com.android.support:support-v4:+

Do not forget to put following in scss file of map directive. It should be outside of class page in scss file.
	ion-app._gmaps_cdv_ .nav-decor{
	  background-color: transparent !important;
	}


For blank map: https://github.com/mapsplugin/cordova-plugin-googlemaps/wiki/TroubleShooting:-Blank-Map

3.TextToSpeech
ionic plugin add cordova-plugin-tts --save
ionic plugin remove cordova-plugin-tts --save