Update Example

Example/testHotUpdate/android/build.gradle

@@ -1,11 +1,18 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext {
+        buildToolsVersion = "28.0.3"
+        minSdkVersion = 16
+        compileSdkVersion = 28
+        targetSdkVersion = 28
+    }
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.1'
+        classpath("com.android.tools.build:gradle:3.4.2")
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -15,6 +22,17 @@ buildscript {
 allprojects {
     repositories {
         mavenLocal()
+        maven {
+            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+            url("$rootDir/../node_modules/react-native/android")
+        }
+        maven {
+            // Android JSC is installed from npm
+            url("$rootDir/../node_modules/jsc-android/dist")
+        }
+
+        google()
         jcenter()
+        maven { url 'https://jitpack.io' }
     }
 }