Improve GRADLE build Performance

Author: chenzhang22

build.gradle

@@ -1,15 +1,32 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-buildscript {
-    repositories {
-        jcenter()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.2'
-    }
-}
-
-allprojects {
-    repositories {
-        jcenter()
-    }
-}
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.2.2'
+    }
+}
+
+allprojects {
+    tasks.withType(Test).configureEach {
+        maxParallelForks = 4
+    }
+
+    tasks.withType(Test).configureEach {
+        forkEvery = 100
+    }
+
+    tasks.withType(Test).configureEach {
+        reports.html.required = false
+        reports.junitXml.required = false
+    }
+
+    tasks.withType(JavaCompile).configureEach {
+        options.incremental = true
+    }
+
+    repositories {
+        jcenter()
+    }
+}