adaptive app icon

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>
\ No newline at end of file

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>
\ No newline at end of file

build.gradle

@@ -6,10 +6,11 @@ buildscript {
         mavenCentral()
         jcenter()
         maven { url 'https://maven.google.com' }
+        google()
     }
     dependencies {
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.1.3'
         classpath 'io.realm:realm-gradle-plugin:3.0.0'
         classpath 'me.tatarka:gradle-retrolambda:3.3.1'
         classpath 'me.tatarka.retrolambda.projectlombok:lombok.ast:0.2.3.a2'

gradle/wrapper/gradle-wrapper.properties

-#Sat Aug 12 23:31:06 EDT 2017
+#Thu Jul 19 21:14:29 EDT 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip