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Add google play services library eclipse

Rename package Android Studio

The package name of an Android app uniquely identifies your app on the device Play Store. Step 1 - Application ID Open Gradle Scripts → app/build.gradle Change the application ID with your own id name Standard naming procedure : Click Sync Now . Change the id as unique as possible, because application id is very important used if you want to publish the application to the google play. Important : your applicationId must will use to generate google-services.json on firebase console configuration Step 2 - Package Name (Optional) This step is optional, because unique id for app identifier already configure at Step 1 above, you can go without change package folder name, but if you want to change id here the step Click once on your package and then click setting icon on Android Studio. Close / Unselect Compact Empty Middle Packages Right click your package and rename it. If you use oneSignal edit manifest File  AndroidManifest.xml OneSignal for sending push notification,

Import Eclipse project into Android Studio