diff --git a/.gitignore b/.gitignore
index 39fb081a..63cb77a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,7 @@
 *.iml
 .gradle
 /local.properties
-/.idea/workspace.xml
-/.idea/libraries
+.idea
 .DS_Store
 /build
 /captures
diff --git a/app/build.gradle b/app/build.gradle
index d453cec1..77f669f4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -48,7 +48,7 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     implementation 'com.github.bumptech.glide:glide:4.9.0'
     implementation 'com.github.chrisbanes:PhotoView:2.1.0'
-//    implementation 'com.github.zhpanvip:BannerViewPager:2.3.5'
+//    implementation 'com.github.zhpanvip:BannerViewPager:2.5.0'
     implementation project(path: ':bannerview')
     implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0'
     implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.1.0'
diff --git a/app/src/main/java/com/example/zhpan/circleviewpager/activity/MainActivity.kt b/app/src/main/java/com/example/zhpan/circleviewpager/activity/MainActivity.kt
index c322f4a5..6f9e2f7a 100644
--- a/app/src/main/java/com/example/zhpan/circleviewpager/activity/MainActivity.kt
+++ b/app/src/main/java/com/example/zhpan/circleviewpager/activity/MainActivity.kt
@@ -25,16 +25,16 @@ class MainActivity : AppCompatActivity() {
 
     private fun initData() {
         val mAdapter = AdapterFragmentPager(supportFragmentManager)
-        vp_fragment!!.adapter = mAdapter
-        vp_fragment!!.disableTouchScroll(true)
-        vp_fragment!!.offscreenPageLimit = 2
-        vp_fragment!!.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
+        vp_fragment?.adapter = mAdapter
+        vp_fragment?.disableTouchScroll(true)
+        vp_fragment?.offscreenPageLimit = 2
+        vp_fragment?.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
             override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
 
             }
 
             override fun onPageSelected(position: Int) {
-                rg_tab!!.check(getCheckedId(position))
+                rg_tab?.check(getCheckedId(position))
             }
 
             override fun onPageScrollStateChanged(state: Int) {
@@ -54,15 +54,15 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun setListener() {
-        rg_tab!!.setOnCheckedChangeListener { group, checkedId ->
+        rg_tab?.setOnCheckedChangeListener { group, checkedId ->
             if (checkedId == R.id.rb_home) {
-                vp_fragment!!.setCurrentItem(AdapterFragmentPager.PAGE_HOME, false)
+                vp_fragment?.setCurrentItem(AdapterFragmentPager.PAGE_HOME, false)
 
             } else if (checkedId == R.id.rb_find) {
-                vp_fragment!!.setCurrentItem(AdapterFragmentPager.PAGE_FIND, false)
+                vp_fragment?.setCurrentItem(AdapterFragmentPager.PAGE_FIND, false)
 
             } else if (checkedId == R.id.rb_add) {
-                vp_fragment!!.setCurrentItem(AdapterFragmentPager.PAGE_OTHERS, false)
+                vp_fragment?.setCurrentItem(AdapterFragmentPager.PAGE_OTHERS, false)
             }
         }
     }
diff --git a/app/src/main/java/com/example/zhpan/circleviewpager/activity/WelcomeActivity.kt b/app/src/main/java/com/example/zhpan/circleviewpager/activity/WelcomeActivity.kt
index e0c5ad5f..7564e5bf 100644
--- a/app/src/main/java/com/example/zhpan/circleviewpager/activity/WelcomeActivity.kt
+++ b/app/src/main/java/com/example/zhpan/circleviewpager/activity/WelcomeActivity.kt
@@ -79,7 +79,7 @@ class WelcomeActivity : BaseDataActivity(), HolderCreator<CustomPageViewHolder>
     }
 
     private fun updateUI(position: Int) {
-        tv_describe!!.text = des[position]
+        tv_describe?.text = des[position]
         val translationAnim = ObjectAnimator.ofFloat(tv_describe, "translationX", -120f, 0f)
         translationAnim.duration = ANIMATION_DURATION.toLong()
         translationAnim.interpolator = DecelerateInterpolator()
@@ -89,13 +89,13 @@ class WelcomeActivity : BaseDataActivity(), HolderCreator<CustomPageViewHolder>
         animatorSet.playTogether(translationAnim, alphaAnimator1)
         animatorSet.start()
 
-        if (position == mViewPager.list.size - 1 && btn_start!!.visibility == View.GONE) {
-            btn_start!!.visibility = View.VISIBLE
+        if (position == mViewPager.list.size - 1 && btn_start?.visibility == View.GONE) {
+            btn_start?.visibility = View.VISIBLE
             ObjectAnimator
                     .ofFloat(btn_start, "alpha", 0f, 1f)
                     .setDuration(ANIMATION_DURATION.toLong()).start()
         } else {
-            btn_start!!.visibility = View.GONE
+            btn_start?.visibility = View.GONE
         }
     }
 
diff --git a/bannerview/src/main/java/com/zhpan/bannerview/indicator/DashIndicatorView.java b/bannerview/src/main/java/com/zhpan/bannerview/indicator/DashIndicatorView.java
index e4804a1d..9165c0c2 100644
--- a/bannerview/src/main/java/com/zhpan/bannerview/indicator/DashIndicatorView.java
+++ b/bannerview/src/main/java/com/zhpan/bannerview/indicator/DashIndicatorView.java
@@ -91,11 +91,6 @@ private void drawSliderStyle(Canvas canvas) {
         canvas.drawRect(left, 0, left + maxWidth, getSliderHeight(), mPaint);
     }
 
-    public DashIndicatorView setSliderHeight(float sliderHeight) {
-        this.sliderHeight = sliderHeight;
-        return this;
-    }
-
     public float getSliderHeight() {
         if (getIndicatorOptions().getSliderHeight() > 0) {
             return getIndicatorOptions().getSliderHeight();
diff --git a/bannerview/src/main/java/com/zhpan/bannerview/indicator/IndicatorView.java b/bannerview/src/main/java/com/zhpan/bannerview/indicator/IndicatorView.java
index b7adf246..54513091 100644
--- a/bannerview/src/main/java/com/zhpan/bannerview/indicator/IndicatorView.java
+++ b/bannerview/src/main/java/com/zhpan/bannerview/indicator/IndicatorView.java
@@ -7,7 +7,7 @@
 import androidx.annotation.Nullable;
 
 import com.zhpan.bannerview.indicator.drawer.BaseDrawer;
-import com.zhpan.bannerview.indicator.drawer.DrawerController;
+import com.zhpan.bannerview.indicator.drawer.DrawerProxy;
 import com.zhpan.bannerview.manager.IndicatorOptions;
 
 /**
@@ -20,7 +20,7 @@
  */
 public class IndicatorView extends BaseIndicatorView implements IIndicator {
 
-    private DrawerController mDrawerController;
+    private DrawerProxy mDrawerProxy;
 
     public IndicatorView(Context context) {
         this(context, null);
@@ -32,25 +32,25 @@ public IndicatorView(Context context, @Nullable AttributeSet attrs) {
 
     public IndicatorView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
-        mDrawerController = new DrawerController(getIndicatorOptions());
+        mDrawerProxy = new DrawerProxy(getIndicatorOptions());
     }
 
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        BaseDrawer.MeasureResult measureResult = mDrawerController.measure(widthMeasureSpec, heightMeasureSpec);
+        BaseDrawer.MeasureResult measureResult = mDrawerProxy.onMeasure(widthMeasureSpec, heightMeasureSpec);
         setMeasuredDimension(measureResult.getMeasureWidth(), measureResult.getMeasureHeight());
     }
 
     @Override
     public void setIndicatorOptions(IndicatorOptions indicatorOptions) {
         super.setIndicatorOptions(indicatorOptions);
-        mDrawerController.setIndicatorOptions(indicatorOptions);
+        mDrawerProxy.setIndicatorOptions(indicatorOptions);
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
-        mDrawerController.draw(canvas);
+        mDrawerProxy.onDraw(canvas);
     }
 }
diff --git a/bannerview/src/main/java/com/zhpan/bannerview/indicator/drawer/DrawerController.java b/bannerview/src/main/java/com/zhpan/bannerview/indicator/drawer/DrawerProxy.java
similarity index 76%
rename from bannerview/src/main/java/com/zhpan/bannerview/indicator/drawer/DrawerController.java
rename to bannerview/src/main/java/com/zhpan/bannerview/indicator/drawer/DrawerProxy.java
index 1806af50..b1456e27 100644
--- a/bannerview/src/main/java/com/zhpan/bannerview/indicator/drawer/DrawerController.java
+++ b/bannerview/src/main/java/com/zhpan/bannerview/indicator/drawer/DrawerProxy.java
@@ -10,14 +10,14 @@
 /**
  * <pre>
  *   Created by zhpan on 2019/11/23.
- *   Description: Indicator Drawer Controller.
+ *   Description: Indicator Drawer Proxy.
  * </pre>
  */
-public class DrawerController {
+public class DrawerProxy implements IDrawer{
     
     private IDrawer mIDrawer;
 
-    public DrawerController(IndicatorOptions indicatorOptions) {
+    public DrawerProxy(IndicatorOptions indicatorOptions) {
         init(indicatorOptions);
     }
 
@@ -36,11 +36,13 @@ public void setIndicatorOptions(IndicatorOptions indicatorOptions) {
         init(indicatorOptions);
     }
 
-    public BaseDrawer.MeasureResult measure(int widthMeasureSpec, int heightMeasureSpec) {
+    @Override
+    public BaseDrawer.MeasureResult onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         return mIDrawer.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 
-    public void draw(Canvas canvas) {
+    @Override
+    public void onDraw(Canvas canvas) {
         mIDrawer.onDraw(canvas);
     }
 }