adding app build version for remote config

Author: andreaowu

firebase-config/src/main/java/com/google/firebase/remoteconfig/RemoteConfigConstants.java

@@ -45,6 +45,7 @@ public final class RemoteConfigConstants {
     RequestFieldKey.PLATFORM_VERSION,
     RequestFieldKey.TIME_ZONE,
     RequestFieldKey.APP_VERSION,
+    RequestFieldKey.APP_VERSION,
     RequestFieldKey.PACKAGE_NAME,
     RequestFieldKey.SDK_VERSION,
     RequestFieldKey.ANALYTICS_USER_PROPERTIES
@@ -59,6 +60,7 @@ public final class RemoteConfigConstants {
     String PLATFORM_VERSION = "platformVersion";
     String TIME_ZONE = "timeZone";
     String APP_VERSION = "appVersion";
+    String APP_BUILD = "appBuild";
     String PACKAGE_NAME = "packageName";
     String SDK_VERSION = "sdkVersion";
     String ANALYTICS_USER_PROPERTIES = "analyticsUserProperties";

firebase-config/src/main/java/com/google/firebase/remoteconfig/internal/ConfigFetchHttpClient.java

@@ -19,6 +19,7 @@
 import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.ANALYTICS_USER_PROPERTIES;
 import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.APP_ID;
 import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.APP_VERSION;
+import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.APP_BUILD;
 import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.COUNTRY_CODE;
 import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.INSTANCE_ID;
 import static com.google.firebase.remoteconfig.RemoteConfigConstants.RequestFieldKey.INSTANCE_ID_TOKEN;
@@ -41,6 +42,7 @@
 import android.util.Log;
 import androidx.annotation.Keep;
 import androidx.annotation.VisibleForTesting;
+import androidx.core.content.pm.PackageInfoCompat;
 import com.google.android.gms.common.util.AndroidUtilsLight;
 import com.google.android.gms.common.util.Hex;
 import com.google.firebase.remoteconfig.BuildConfig;
@@ -322,9 +324,10 @@ private JSONObject createFetchRequestBody(
           context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
       if (packageInfo != null) {
         requestBodyMap.put(APP_VERSION, packageInfo.versionName);
+        requestBodyMap.put(APP_BUILD, PackageInfoCompat.getLongVersionCode(packageInfo));
       }
     } catch (NameNotFoundException e) {
-      // Leave app version blank if package cannot be found.
+      // Leave app version and build number blank if package cannot be found.
     }
 
     requestBodyMap.put(PACKAGE_NAME, context.getPackageName());