Update and fix Gradle setup

Author: friederbluemle

.babelrc

@@ -1,15 +1,7 @@
-
 # OSX
 #
 .DS_Store
 
-# node.js
-#
-node_modules/
-npm-debug.log
-yarn-error.log
-  
-
 # Xcode
 #
 build/
@@ -29,7 +21,6 @@ DerivedData
 *.ipa
 *.xcuserstate
 project.xcworkspace
-      
 
 # Android/IntelliJ
 #
@@ -38,9 +29,17 @@ build/
 .gradle
 local.properties
 *.iml
+android/gradle/
+android/gradlew
+android/gradlew.bat
+
+# node.js
+#
+node_modules/
+npm-debug.log
+yarn-error.log
 
 # BUCK
 buck-out/
 \.buckd/
 *.keystore
-      

.gitignore

@@ -3,25 +3,25 @@ def safeExtGet(prop, fallback) {
 }
 
 buildscript {
-    repositories {
-        maven {
-            url 'https://maven.google.com/'
-            name 'Google'
+    // The Android Gradle plugin is only required when opening the android folder stand-alone.
+    // This avoids unnecessary downloads and potential conflicts when the library is included as a
+    // module dependency in an application project.
+    if (project == rootProject) {
+        repositories {
+            google()
+            jcenter()
+        }
+        dependencies {
+            classpath 'com.android.tools.build:gradle:3.5.3'
         }
-        jcenter()
-    }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
     }
 }
 
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion safeExtGet('compileSdkVersion', 27)
-    buildToolsVersion safeExtGet('buildToolsVersion', '28.0.2')
-
+    compileSdkVersion safeExtGet('compileSdkVersion', 28)
+    buildToolsVersion safeExtGet('buildToolsVersion', '28.0.3')
     defaultConfig {
         minSdkVersion safeExtGet('minSdkVersion', 16)
         targetSdkVersion safeExtGet('targetSdkVersion', 26)
@@ -37,14 +37,22 @@ android {
 }
 
 repositories {
+    mavenLocal()
+    maven {
+        // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+        url "$rootDir/../node_modules/react-native/android"
+    }
     maven {
-        url 'https://maven.google.com/'
-        name 'Google'
+        // Android JSC is installed from npm
+        url "$rootDir/../node_modules/jsc-android/dist"
     }
+    google()
     jcenter()
 }
 
 dependencies {
-    implementation 'com.facebook.react:react-native:'+safeExtGet('reactNativeVersion', '+')
+    //noinspection GradleDynamicVersion
+    implementation 'com.facebook.react:react-native:+'  // From node_modules
     implementation 'net.openid:appauth:0.7.1'
+    implementation 'androidx.browser:browser:1.2.0'
 }

android/build.gradle

@@ -0,0 +1,3 @@
+module.exports = {
+  presets: ['module:metro-react-native-babel-preset'],
+};