Organization of gradle files

build.gradle

@@ -1,4 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
+ext {
+    compileSdkVersion = 27
+    targetSdkVersion = 27
+    mindkVersion = 18
+
+    gsonVersion = '2.8.2'
+
+    supportLibraryVersion = '27.1.0'
+    constraintLayoutVersion = '1.0.2'
+}
 
 buildscript {
 
@@ -7,7 +17,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath "com.android.tools.build:gradle:3.0.1"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

demo/build.gradle

@@ -1,30 +1,29 @@
 apply plugin: 'com.android.application'
+apply from: './dependencies.gradle'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion rootProject.compileSdkVersion
+
+    dataBinding {
+        enabled = true
+    }
+
     defaultConfig {
+        minSdkVersion rootProject.mindkVersion
+        targetSdkVersion rootProject.targetSdkVersion
         applicationId "br.com.liveo.searchview_materialdesign"
-        minSdkVersion 18
-        targetSdkVersion 27
+
         versionCode 1
         versionName "1.0"
+
+        vectorDrawables.useSupportLibrary = true
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
+
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
-}
-
-dependencies {
-    implementation project(':library')
-    implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:27.1.0'
-    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
-    implementation 'com.android.support:design:27.1.0'
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.1'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
-}
+}

demo/dependencies.gradle

@@ -0,0 +1,9 @@
+dependencies {
+    implementation project(':library')
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+
+    implementation "com.google.code.gson:gson:$gsonVersion"
+    implementation "com.android.support:design:$supportLibraryVersion"
+    implementation "com.android.support:appcompat-v7:$supportLibraryVersion"
+    implementation "com.android.support.constraint:constraint-layout:$constraintLayoutVersion"
+}