Load Android Gradle Plugin conditionally

android/build.gradle

@@ -2,14 +2,20 @@ buildscript {
     ext.safeExtGet = {prop, fallback ->
         rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
     }
-    repositories {
-        google()
-        jcenter()
-    }
     
-    dependencies {
+    // The Android Gradle plugin is only required when opening the android folder stand-alone.
-        //noinspection GradleDependency
+    // This avoids unnecessary downloads and potential conflicts when the library is included as a
-        classpath("com.android.tools.build:gradle:${safeExtGet('gradlePluginVersion', '3.4.1')}")
+    // module dependency in an application project.
+    if (project == rootProject) {
+        repositories {
+            google()
+            jcenter()
+        }
+        
+        dependencies {
+            //noinspection GradleDependency
+            classpath("com.android.tools.build:gradle:3.5.1")
+        }
     }
 }