diff --git a/library/build.gradle b/library/build.gradle
index 1be59f8..50ddc0b 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -8,8 +8,8 @@ android {
     defaultConfig {
         minSdkVersion 15
         targetSdkVersion 26
-        versionCode 1
-        versionName "1.0"
+        versionCode 2
+        versionName "1.1"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
diff --git a/library/src/main/java/cn/davidsu/library/CustomShadowBackground.java b/library/src/main/java/cn/davidsu/library/CustomShadowBackground.java
index 59cf225..7aed765 100644
--- a/library/src/main/java/cn/davidsu/library/CustomShadowBackground.java
+++ b/library/src/main/java/cn/davidsu/library/CustomShadowBackground.java
@@ -39,7 +39,7 @@ public class CustomShadowBackground extends Drawable {
     private int mOffsetY;
 
     @Nullable
-    private RectF mRectF;
+    private RectF mRectF = new RectF();
     @Nullable
     private Paint mPaint;
 
@@ -62,11 +62,9 @@ protected CustomShadowBackground(@ColorInt int color, @Nullable int[] colorArray
 
     @Override
     public void draw(@NonNull Canvas canvas) {
-        if (mRectF == null) {
-            Rect bounds = getBounds();
-            mRectF = new RectF(bounds.left + mShadowRadius - mOffsetX, bounds.top + mShadowRadius - mOffsetY, bounds.right - mShadowRadius - mOffsetX,
-                    bounds.bottom - mShadowRadius - mOffsetY);
-        }
+        Rect bounds = getBounds();
+        mRectF.set(bounds.left + mShadowRadius - mOffsetX, bounds.top + mShadowRadius - mOffsetY, bounds.right - mShadowRadius - mOffsetX,
+                bounds.bottom - mShadowRadius - mOffsetY);
 
         if (mPaint == null) {
             initPaint();