version up for android tools and libs, sdk api

example/android/app/build.gradle

@@ -65,6 +65,10 @@ import com.android.build.OutputFile
  * ]
  */
 
+if (!project.file("../../node_modules/react-native/react.gradle").exists()) {
+    throw new RuntimeException("React modules are not installed. execute: 'yarn install' in 'example' folder. ")
+}
+
 apply from: "../../node_modules/react-native/react.gradle"
 
 /**
@@ -83,15 +87,17 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '25.0.3'
+    compileSdkVersion 27
+    buildToolsVersion '28.0.3'
 
     defaultConfig {
         applicationId "com.viewshotexample"
         minSdkVersion 16
-        targetSdkVersion 22
+        targetSdkVersion 27
+
         versionCode 1
         versionName "1.0"
+
         ndk {
             abiFilters "armeabi-v7a", "x86"
         }
@@ -115,7 +121,7 @@ android {
         variant.outputs.each { output ->
             // For each separate APK per architecture, set a unique version code as described here:
             // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits
-            def versionCodes = ["armeabi-v7a":1, "x86":2]
+            def versionCodes = ["armeabi-v7a": 1, "x86": 2]
             def abi = output.getFilter(OutputFile.ABI)
             if (abi != null) {  // null for the universal-debug, universal-release variants
                 output.versionCodeOverride =
@@ -125,11 +131,23 @@ android {
     }
 }
 
+repositories {
+    google()
+    jcenter()
+    mavenLocal()
+    maven {
+        // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+        url "${project.projectDir}/../node_modules/react-native/android"
+    }
+}
+
 dependencies {
     compile project(':react-native-svg')
     compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:23.0.1"
+
+    compile "com.android.support:appcompat-v7:27.+"
     compile "com.facebook.react:react-native:+"  // From node_modules
+
     compile project(':react-native-view-shot')
     compile project(':gl-react-native')
     compile project(':react-native-maps')