Android – Is it possible to get install referrer programmatically

You can use com.android.vending.INSTALL_REFERRER.

The Google Play com.android.vending.INSTALL_REFERRER Intent is
broadcast when an app is installed from the Google Play Store.

Add this receiver to AndroidManifest.xml

<receiver
    android:name="com.example.android.InstallReferrerReceiver"
    android:exported="true"
    android:permission="android.permission.INSTALL_PACKAGES">
    <intent-filter>
        <action android:name="com.android.vending.INSTALL_REFERRER" />
    </intent-filter>
</receiver>

Create a BroadcastReceiver:

public class InstallReferrerReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String referrer = intent.getStringExtra("referrer");

        //Use the referrer
    }
}

You can test the referral tracking following the steps of this answer.