diff --git a/.gitignore b/.gitignore
index d81320e..13dc870 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,14 +14,12 @@ gradle-app.setting
 # Mobile Tools for Java (J2ME)
 .mtj.tmp/
 
-# Package Files #
-*.jar
-*.war
-*.ear
-
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
 
 ### Proguard ###
 proguard.map
+
+### jetbrains
+.idea/
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..54e366b
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,8 @@
+language:
+  - java
+
+jdk:
+  - oraclejdk8
+
+script:
+  - ./gradlew clean proguard
diff --git a/README.md b/README.md
index d8a4099..2e0ad6c 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,12 @@
 Example Java App with Proguard
 ==============================
+[![Build Status](https://travis-ci.org/gengjiawen/proguard-gradle-example.svg?branch=master)](https://travis-ci.org/gengjiawen/proguard-gradle-example)
 
 Building
 --------
 
 ```shell
-./gradlew clean build proguard
+./gradlew clean proguard
 ```
 
 Running
@@ -23,3 +24,4 @@ Outputs
 -   `build/libs/proguard-gradle-example.out.jar` - obfuscated main package
 
 -   `proguard.map` - proguard obfuscation mapping file
+
diff --git a/build.gradle b/build.gradle
index 393c3e8..f4318e1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,23 +1,28 @@
 apply plugin: 'java'
 
 buildscript {
-  repositories {
-    flatDir dirs: '/usr/local/Cellar/proguard/4.11/libexec'
-  }
-  dependencies {
-    classpath ':proguard:'
-  }
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'net.sf.proguard:proguard-gradle:5.2.1'
+    }
+}
+
+ext {
+    jarName = "proguard-gradle-example"
 }
 
 jar {
-  manifest {
-    attributes 'Main-Class': "com.loopj.example.App"
-  }
+    baseName = jarName
+    manifest {
+        attributes 'Main-Class': "com.loopj.example.App"
+    }
 }
 
-task proguard(type: proguard.gradle.ProGuardTask) {
-  configuration 'proguard.txt'
+task proguard(type: proguard.gradle.ProGuardTask, dependsOn: build) {
+    configuration 'proguard.txt'
 
-  injars 'build/libs/proguard-gradle-example.jar'
-  outjars 'build/libs/proguard-gradle-example.out.jar'
+    injars "$buildDir/libs/${jarName}.jar"
+    outjars "$buildDir/libs/${jarName}.out.jar"
 }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..05ef575
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index fd27bdf..c25cec5 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Wed Oct 21 11:34:03 PDT 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip
diff --git a/gradlew b/gradlew
index 91a7e26..9d82f78 100755
--- a/gradlew
+++ b/gradlew
@@ -42,11 +42,6 @@ case "`uname`" in
     ;;
 esac
 
-# For Cygwin, ensure paths are in UNIX format before anything is touched.
-if $cygwin ; then
-    [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
-fi
-
 # Attempt to set APP_HOME
 # Resolve links: $0 may be a link
 PRG="$0"
@@ -61,9 +56,9 @@ while [ -h "$PRG" ] ; do
     fi
 done
 SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >&-
+cd "`dirname \"$PRG\"`/" >/dev/null
 APP_HOME="`pwd -P`"
-cd "$SAVED" >&-
+cd "$SAVED" >/dev/null
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
@@ -114,6 +109,7 @@ fi
 if $cygwin ; then
     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
 
     # We build the pattern for arguments to be converted via cygpath
     ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..8a0b282
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega