-keep class null {
    <init>();
    void attachBaseContext(android.content.Context);
}
-keep class com.barcodereaderexample.MainActivity { <init>(); }
-keep class com.facebook.react.devsupport.DevSettingsActivity { <init>(); }
-keep class com.google.android.gms.ads.AdActivity { <init>(); }
-keep class com.google.android.gms.ads.purchase.InAppPurchaseActivity { <init>(); }
-keep class com.google.android.gms.appinvite.PreviewActivity { <init>(); }
-keep class com.google.android.gms.auth.api.signin.internal.SignInHubActivity { <init>(); }
-keep class com.google.android.gms.auth.api.signin.RevocationBoundService { <init>(); }
-keep class com.google.android.gms.measurement.AppMeasurementContentProvider { <init>(); }
-keep class com.google.android.gms.measurement.AppMeasurementReceiver { <init>(); }
-keep class com.google.android.gms.measurement.AppMeasurementService { <init>(); }
-keep public class * extends android.app.backup.BackupAgent {
    <init>();
}
-keep public class * extends java.lang.annotation.Annotation {
    *;
}