Update to latest Gradle and build tools version

.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="5">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="javax.annotation.CheckForNull" />
+          <item index="3" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="4" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
   <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>

.idea/vcs.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
-    <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
 </project>
\ No newline at end of file

app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 24
-    buildToolsVersion '26.0.2'
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         applicationId "im.gitter.gitter"
@@ -24,13 +24,13 @@ repositories {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:design:24.2.1'
-    compile "com.mixpanel.android:mixpanel-android:4.6.4"
-    compile 'com.android.volley:volley:1.0.0'
-    compile "com.google.android.gms:play-services-gcm:9.6.1"
-    compile 'joda-time:joda-time:2.5'
-    compile 'com.github.rahatarmanahmed:circularprogressview:2.4.0'
-    compile 'com.getbase:floatingactionbutton:1.10.1'
-    testCompile 'junit:junit:4.12'
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:design:24.2.1'
+    implementation "com.mixpanel.android:mixpanel-android:4.6.4"
+    implementation 'com.android.volley:volley:1.0.0'
+    implementation "com.google.android.gms:play-services-gcm:9.6.1"
+    implementation 'joda-time:joda-time:2.5'
+    implementation 'com.github.rahatarmanahmed:circularprogressview:2.4.0'
+    implementation 'com.getbase:floatingactionbutton:1.10.1'
+    testImplementation 'junit:junit:4.12'
 }

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.1.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

gitter-android-app.iml

@@ -13,7 +13,7 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/.gradle" />
     </content>
-    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>
\ No newline at end of file

gradle/wrapper/gradle-wrapper.properties

-#Thu Mar 15 20:04:50 GMT 2018
+#Wed Aug 01 00:59:48 CDT 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