diff --git a/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.java b/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.java
index 28fc7df29..89f9ab751 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.java
+++ b/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.java
@@ -25,19 +25,18 @@ import android.os.Bundle;
 import android.os.Parcelable;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.support.v4.view.animation.FastOutLinearInInterpolator;
 import android.support.v7.widget.RecyclerView;
 import android.util.SparseArray;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
-import android.view.animation.Interpolator;
 
 import com.hippo.animation.SimpleAnimatorListener;
 import com.hippo.drawable.AddDeleteDrawable;
 import com.hippo.effect.ViewTransition;
 import com.hippo.ehviewer.R;
 import com.hippo.ehviewer.ui.ContentActivity;
+import com.hippo.util.InterpolatorUtils;
 import com.hippo.ehviewer.widget.ContentLayout;
 import com.hippo.ehviewer.widget.OffsetLayout;
 import com.hippo.ehviewer.widget.SearchBar;
@@ -66,8 +65,6 @@ public class GalleryListScene extends Scene implements SearchBar.Helper,
     private final static int FAB_STATE_NORMAL = 0;
     private final static int FAB_STATE_SEARCH = 1;
 
-    private final static Interpolator FAST_OUT_LINEAR_IN_INTERPOLATOR = new FastOutLinearInInterpolator();
-
     private ContentActivity mActivity;
     private Resources mResources;
     private SearchDatabase mSearchDatabase;
@@ -210,7 +207,7 @@ public class GalleryListScene extends Scene implements SearchBar.Helper,
             PropertyValuesHolder scaleYPvh = PropertyValuesHolder.ofFloat("scaleY", 1f, 0f);
             ObjectAnimator oa = ObjectAnimator.ofPropertyValuesHolder(mCornerFab, scaleXPvh, scaleYPvh);
             oa.setDuration(ANIMATE_TIME / 2);
-            oa.setInterpolator(FAST_OUT_LINEAR_IN_INTERPOLATOR);
+            oa.setInterpolator(InterpolatorUtils.SLOW_FAST_INTERPOLATOR);
             oa.setRepeatCount(1);
             oa.setRepeatMode(ValueAnimator.REVERSE);
             final Drawable finalDrawable = drawable;
diff --git a/app/src/main/java/com/hippo/util/InterpolatorUtils.java b/app/src/main/java/com/hippo/util/InterpolatorUtils.java
new file mode 100644
index 000000000..f08a0b6c3
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/InterpolatorUtils.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+import android.support.v4.view.animation.FastOutLinearInInterpolator;
+import android.support.v4.view.animation.FastOutSlowInInterpolator;
+import android.support.v4.view.animation.LinearOutSlowInInterpolator;
+import android.view.animation.Interpolator;
+
+public final class InterpolatorUtils {
+
+    public static final Interpolator FAST_SLOW_INTERPOLATOR = new LinearOutSlowInInterpolator();
+    public static final Interpolator SLOW_FAST_INTERPOLATOR = new FastOutLinearInInterpolator();
+    public static final Interpolator SLOW_FAST_SLOW_INTERPOLATOR = new FastOutSlowInInterpolator();
+}
diff --git a/app/src/main/java/com/hippo/widget/CheckTextView.java b/app/src/main/java/com/hippo/widget/CheckTextView.java
index 92171dede..5982c2493 100644
--- a/app/src/main/java/com/hippo/widget/CheckTextView.java
+++ b/app/src/main/java/com/hippo/widget/CheckTextView.java
@@ -30,6 +30,7 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.TextView;
 
+import com.hippo.util.InterpolatorUtils;
 import com.hippo.util.MathUtils;
 
 public class CheckTextView extends TextView implements OnClickListener, Hotspotable {
@@ -133,9 +134,11 @@ public class CheckTextView extends TextView implements OnClickListener, Hotspota
         if (mChecked) {
             radiusAnim = ObjectAnimator.ofFloat(this, "radius",
                     0f, mMaxRadius);
+            radiusAnim.setInterpolator(InterpolatorUtils.FAST_SLOW_INTERPOLATOR);
         } else {
             radiusAnim = ObjectAnimator.ofFloat(this, "radius",
                     mMaxRadius, 0f);
+            radiusAnim.setInterpolator(InterpolatorUtils.SLOW_FAST_INTERPOLATOR);
         }
         radiusAnim.setDuration(ANIMATION_DURATION); // TODO decide duration according to mMaxRadius
         radiusAnim.addListener(mAnimatorListener);
diff --git a/app/src/main/java/com/hippo/widget/FabLayout.java b/app/src/main/java/com/hippo/widget/FabLayout.java
index 6192fc1ed..e5a2c7672 100644
--- a/app/src/main/java/com/hippo/widget/FabLayout.java
+++ b/app/src/main/java/com/hippo/widget/FabLayout.java
@@ -23,8 +23,6 @@ import android.os.Build;
 import android.os.Bundle;
 import android.os.Parcelable;
 import android.support.annotation.NonNull;
-import android.support.v4.view.animation.FastOutLinearInInterpolator;
-import android.support.v4.view.animation.LinearOutSlowInInterpolator;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
@@ -32,12 +30,10 @@ import android.view.animation.Interpolator;
 
 import com.hippo.animation.SimpleAnimatorListener;
 import com.hippo.ehviewer.R;
+import com.hippo.util.InterpolatorUtils;
 
 public class FabLayout extends ViewGroup implements View.OnClickListener {
 
-    private final static Interpolator LINEAR_OUT_SLOW_IN_INTERPOLATOR = new LinearOutSlowInInterpolator();
-    private final static Interpolator FAST_OUT_LINEAR_IN_INTERPOLATOR = new FastOutLinearInInterpolator();
-
     private static long ANIMATE_TIME = 300l;
 
     private static final String STATE_KEY_SUPER = "super";
@@ -276,14 +272,14 @@ public class FabLayout extends ViewGroup implements View.OnClickListener {
             endTranslationY = 0f;
             startAlpha = 0f;
             endAlpha = 1f;
-            interpolator = LINEAR_OUT_SLOW_IN_INTERPOLATOR;
+            interpolator = InterpolatorUtils.FAST_SLOW_INTERPOLATOR;
         } else {
             startTranslationY = 0f;
             endTranslationY = mMainFabCenterY -
                     (child.getTop() + (child.getHeight() / 2));
             startAlpha = 1f;
             endAlpha = 0f;
-            interpolator = FAST_OUT_LINEAR_IN_INTERPOLATOR;
+            interpolator = InterpolatorUtils.SLOW_FAST_INTERPOLATOR;
         }
 
         PropertyValuesHolder translationYPvh = PropertyValuesHolder.ofFloat(