diff --git a/build.gradle b/build.gradle
index a18211e..93eb2ed 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,19 +1,25 @@
 buildscript {
     repositories {
-        mavenCentral()
+        google()
+        jcenter()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:0.14.0'
+        classpath 'com.android.tools.build:gradle:3.0.0'
     }
 }
 
 ext {
-    compileSdkVersion = 17
-    buildToolsVersion = "19.1.0"
+    compileSdkVersion = 26
+    buildToolsVersion = "26.0.2"
 }
 
 allprojects {
     repositories {
         mavenCentral()
+        google()
     }
 }
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index ffaa281..649480d 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
diff --git a/sample/.gitignore b/sample/.gitignore
new file mode 100644
index 0000000..2ebb661
--- /dev/null
+++ b/sample/.gitignore
@@ -0,0 +1,26 @@
+# Built application files
+*.apk
+build/
+
+# gradle files
+.idea/
+.gradle/
+
+# iml files
+*.iml
+
+# Local configuration file (sdk path, etc)
+local.properties
+gradle.properties
+
+# proguard files
+proguard/
+
+# Log Files
+*.log
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
\ No newline at end of file