A new Android device means you transfer all content, including your favorite apps, from old to new. You do not have to do this manually because Google provides built-in support for backing up and restoring your content. How It Works:
These steps may vary depending on the device manufacturer and version of Android and may only be available in newer versions of Android. If these steps are not available at all, you can instead use a third-party app provided by your device manufacturer to transfer your apps.
Using Google Backup Method
Google uses your Google Account to back up Your content, including apps, uses the included drive storage. You need to enable Google Backup on your old device before making any transfers.
Turn on Google Backup
To start, go to your app's Settings menu in the app tray or swipe Tap the gear icon to access your notification shadow.
Then tap "System". If you have a Samsung device, the option is "Accounts and Backup".
In the next menu, Samsung owners need to tap Backup and Restore. Other Android device owners can ignore this step. 
Tap Save. Samsung owners make sure "Back up my data" is enabled, then select "Google Account."
. Make sure "Back up to Google Drive" is set to "OK" and tap "Back up now" to make sure your apps are fully secured.
You can also tap on "App Data" to scroll and check each app you want to transfer is listed. If this is the case, you can begin the transfer. So switch to your new device.
Transfer your apps to your new device.
When you turn on a new Android device or a device that has been reset to factory settings In Preferences, you can restore your content (including apps) from your Google Drive backup.
Keep in mind that these instructions may vary depending on your Android version and the manufacturer of your device.  Power on your new device and follow the first instructions until you get the option to start restoring your data. Choose "Backup from the Cloud" to start the process.
The next screen may ask you to sign in to your Google Account first. It will then display a list of recent backups from the Android devices associated with your Google Account.
To continue, tap the device you want.
For a list of content options to restore, including your device settings and contacts. "Apps" may be disabled. Touch the checkbox next to it and select "Restore".
When your data is restored, you can finish the process. Start the remainder of the setup process and use your device.
Once the restore is complete, your apps (and other content) will be transferred from your Google Drive backup to your new device and can be used there.
Checking the Google Play Store app library
If you've already set up your new device before restoring or transferring data, it might be worthwhile looking at which apps you've previously used with your Google Have installed account. In your App Store in the Play Store, you can quickly install any apps that may be missing on your new device.
First open the Google Play Store app and then expand the Hamburger menu in the upper left corner. 
Touch My Apps & Games.
On the Library tab These are devices that are not on this device. Next to one (or all) apps you want to install on your device, tap Install.
Using Third-Party Apps
The best and most reliable method for most users is to use the built-in Google backup method to transfer your apps and other content. If this option does not work for you, third-party apps are available.
As with the Google Backup method, it lets you transfer your apps from one Android device to another. Most of these options are available in the Google Play Store and sometimes preinstalled.
The best and most reliable options are offered by device manufacturers such as LG Mobile Switch, Huawei Backup and Samsung Smart Switch. There are other third-party apps like Helium, but they have a mixed reputation as users report that they do not work well on certain devices.
Samsung Smart Switch lets you, for example, apps and your apps transfer other content from one Samsung device to another. You can do this wirelessly or connect your devices with a suitable USB cable.
Transferring from iPhone to Android
Android and iOS are two completely different environments, so it's not possible to transfer your iPhone apps directly to an Android device. However, many developers offer their apps for both platforms, and Google can search for suitable apps during the new device setup process.
If you're starting to set up a new Android device instead of opting to transfer from a Google Drive Tap the option to transfer data from your iPhone, and then follow the onscreen instructions.
Samsung device owners can also use the Smart Switch app, which offers its own downloadable app option during the transfer process.