misc: Add easy enabled splits and flavors in RN Android samples (#4157)

Author: krystofwoldrich

samples/react-native/android/app/build.gradle

@@ -146,6 +146,39 @@ android {
             keyPassword 'android'
         }
     }
+
+    if (System.getenv('SENTRY_SAMPLE_ENABLE_ABI_SPLIT') == 'true') {
+      splits {
+          abi {
+              enable true
+              reset()
+              include 'x86', 'arm64-v8a'
+              universalApk true
+          }
+      }
+      project.ext.versionCodes = ['armeabi': 1, 'armeabi-v7a': 2, 'arm64-v8a': 3, 'mips': 5, 'mips64': 6, 'x86': 8, 'x86_64': 9]
+      android.applicationVariants.all { variant ->
+          variant.outputs.each { output ->
+              output.versionCodeOverride =
+                  project.ext.versionCodes.get(output.getFilter(
+                      com.android.build.OutputFile.ABI), 0) * 10000000 + android.defaultConfig.versionCode
+          }
+      }
+    }
+
+    if (System.getenv('SENTRY_SAMPLE_ENABLE_FLAVORS') == 'true') {
+      flavorDimensions "version"
+      productFlavors {
+        regular {
+            dimension "version"
+        }
+        demo {
+            dimension "version"
+            applicationIdSuffix "demo"
+        }
+      }
+    }
+
     buildTypes {
         debug {
             signingConfig signingConfigs.debug

samples/react-native/package.json

@@ -17,7 +17,8 @@
     "clean-watchman": "watchman watch-del-all",
     "set-build-number": "npx react-native-version --skip-tag --never-amend --set-build",
     "set-version": "npm version --no-git-tag-version",
-    "postversion": "npx react-native-version --skip-tag --never-amend"
+    "postversion": "npx react-native-version --skip-tag --never-amend",
+    "build-android-release-splits-flavors": "export SENTRY_SAMPLE_ENABLE_ABI_SPLIT=true; export SENTRY_SAMPLE_ENABLE_FLAVORS=true; cd android; ./gradlew assembleRelease; cd .."
   },
   "dependencies": {
     "@react-navigation/bottom-tabs": "^6.5.12",