diff --git a/app/build.gradle b/app/build.gradle
index 21d6da9..607f058 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.0"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.1"
 
     defaultConfig {
         applicationId "com.waynell.leafanimation"
         minSdkVersion 11
-        targetSdkVersion 23
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }
diff --git a/app/src/main/java/com/waynell/leafanimation/MainActivity.java b/app/src/main/java/com/waynell/leafanimation/MainActivity.java
index c9245d4..172edd6 100644
--- a/app/src/main/java/com/waynell/leafanimation/MainActivity.java
+++ b/app/src/main/java/com/waynell/leafanimation/MainActivity.java
@@ -11,18 +11,21 @@
 
 public class MainActivity extends Activity {
 
+	DropAnimationView mDropAnimation;
+
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_main);
-        DropAnimationView view = (DropAnimationView) findViewById(R.id.drop_animation_view);
-        view.setDrawables(R.drawable.leaf_1,
+		mDropAnimation = findViewById(R.id.drop_animation_view);
+		mDropAnimation.setDrawables(R.drawable.leaf_1,
                 R.drawable.leaf_2,
                 R.drawable.leaf_3,
                 R.drawable.leaf_4,
                 R.drawable.leaf_5,
                 R.drawable.leaf_6);
-        view.startAnimation();
+//		mDropAnimation.setAnimationRate(200);
+		mDropAnimation.startAnimation();
 	}
 
 	@Override
@@ -41,6 +44,14 @@ public boolean onOptionsItemSelected(MenuItem item) {
 
 		//noinspection SimplifiableIfStatement
 		if (id == R.id.action_settings) {
+			if (mDropAnimation.isAnimating())
+			{
+				mDropAnimation.stopAnimation();
+			}
+			else
+			{
+				mDropAnimation.startAnimation();
+			}
 			return true;
 		}
 
diff --git a/build.gradle b/build.gradle
index fa5f896..581d632 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,9 +5,9 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.0'
-        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.4'
-        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
+        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.2'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/drop-animation-view/build.gradle b/drop-animation-view/build.gradle
index 0176885..71e98aa 100644
--- a/drop-animation-view/build.gradle
+++ b/drop-animation-view/build.gradle
@@ -6,12 +6,12 @@ version '1.0'
 group = 'com.waynell.library'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.1"
 
     defaultConfig {
         minSdkVersion 11
-        targetSdkVersion 23
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }
diff --git a/drop-animation-view/src/main/java/com/waynell/library/DropAnimationView.java b/drop-animation-view/src/main/java/com/waynell/library/DropAnimationView.java
index 424e75d..2e141f6 100644
--- a/drop-animation-view/src/main/java/com/waynell/library/DropAnimationView.java
+++ b/drop-animation-view/src/main/java/com/waynell/library/DropAnimationView.java
@@ -28,7 +28,7 @@ public class DropAnimationView extends FrameLayout {
 
     private final Random mRandom = new Random();
 
-    private boolean mStopAnimation;
+    private boolean animating;
 
     private int mMinSize;
 
@@ -60,7 +60,7 @@ public class DropAnimationView extends FrameLayout {
 
         @Override
         public void run() {
-            if (mStopAnimation || (mMinSize == 0 && mMaxSize == 0)) {
+            if (!animating || (mMinSize == 0 && mMaxSize == 0)) {
                 return;
             }
 
@@ -166,14 +166,14 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 
     public void startAnimation() {
         if(mDrawables != null) {
-            mStopAnimation = false;
+            animating = true;
             setVisibility(VISIBLE);
             beginAnimate(false);
         }
     }
 
     public void stopAnimation() {
-        mStopAnimation = true;
+        animating = false;
         removeCallbacks(mRunnable);
         setVisibility(GONE);
         for (AnimatorSet as : mAnimatorSetList) {
@@ -220,6 +220,15 @@ public void setEnableRotationAnimation(boolean enableRotationAnimation) {
         mEnableRotationAnimation = enableRotationAnimation;
     }
 
+    public void setAnimationRate(int rate) {
+        mAnimationRate = rate;
+    }
+
+    public boolean isAnimating()
+    {
+        return animating;
+    }
+
     private void beginAnimate(boolean delayed) {
         postDelayed(mRunnable, delayed ? mRandom.nextInt(4) * 1000 : 0);
     }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 589febe..cea089f 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Nov 08 16:52:06 CST 2015
-distributionBase=GRADLE_USER_HOME
-distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
-zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.4-all.zip
+#Mon Dec 11 20:22:15 CST 2017
+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