diff --git a/app/build.gradle b/app/build.gradle
index 22fe0b2..b78939b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 21
-    buildToolsVersion "21.1.1"
+    buildToolsVersion "21.1.2"
 
     defaultConfig {
         applicationId "maxon.guessnumber"
@@ -21,5 +21,5 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:21.0.2'
+    compile 'com.android.support:appcompat-v7:22.2.0'
 }
diff --git a/app/src/main/ic_launcher-web.png b/app/src/main/ic_launcher-web.png
index 67c1718..d7d2494 100644
Binary files a/app/src/main/ic_launcher-web.png and b/app/src/main/ic_launcher-web.png differ
diff --git a/app/src/main/java/maxon/guessnumber/GuessNumberActivity.java b/app/src/main/java/maxon/guessnumber/GuessNumberActivity.java
index 1cf47e0..77871bf 100644
--- a/app/src/main/java/maxon/guessnumber/GuessNumberActivity.java
+++ b/app/src/main/java/maxon/guessnumber/GuessNumberActivity.java
@@ -3,7 +3,7 @@
 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.v7.app.ActionBarActivity;
+import android.support.v7.app.AppCompatActivity;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -19,7 +19,7 @@
  *
  * @author yfwz100
  */
-public class GuessNumberActivity extends ActionBarActivity {
+public class GuessNumberActivity extends AppCompatActivity {
 
     // UI components.
     private TextView[] numberTextViews;
diff --git a/app/src/main/res/anim/number_translation.xml b/app/src/main/res/anim/number_translation.xml
deleted file mode 100644
index 0892c66..0000000
--- a/app/src/main/res/anim/number_translation.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<set xmlns:android="http://schemas.android.com/apk/res/android"
-    android:shareInterpolator="true">
-    <translate
-        android:duration="1000"
-        android:fromXDelta="-50%"
-        android:toXDelta="0" />
-    <alpha
-        android:duration="1000"
-        android:fromAlpha="0.0"
-        android:toAlpha="1.0" />
-</set>
\ No newline at end of file
diff --git a/app/src/main/res/drawable-hdpi/ic_launcher.png b/app/src/main/res/drawable-hdpi/ic_launcher.png
index d933104..1a6261b 100644
Binary files a/app/src/main/res/drawable-hdpi/ic_launcher.png and b/app/src/main/res/drawable-hdpi/ic_launcher.png differ
diff --git a/app/src/main/res/drawable-mdpi/ic_launcher.png b/app/src/main/res/drawable-mdpi/ic_launcher.png
index aa80f11..8bc7c87 100644
Binary files a/app/src/main/res/drawable-mdpi/ic_launcher.png and b/app/src/main/res/drawable-mdpi/ic_launcher.png differ
diff --git a/app/src/main/res/drawable-xhdpi/ic_launcher.png b/app/src/main/res/drawable-xhdpi/ic_launcher.png
index 08493e2..9121448 100644
Binary files a/app/src/main/res/drawable-xhdpi/ic_launcher.png and b/app/src/main/res/drawable-xhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/ic_launcher.png b/app/src/main/res/drawable-xxhdpi/ic_launcher.png
index d311a8f..2ef4007 100644
Binary files a/app/src/main/res/drawable-xxhdpi/ic_launcher.png and b/app/src/main/res/drawable-xxhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/layout/dialog_about.xml b/app/src/main/res/layout/dialog_about.xml
index 5053720..5d4b9df 100644
--- a/app/src/main/res/layout/dialog_about.xml
+++ b/app/src/main/res/layout/dialog_about.xml
@@ -10,12 +10,11 @@
 
     <ImageView
         android:id="@+id/logo"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentLeft="false"
         android:layout_alignParentStart="false"
         android:layout_alignParentTop="false"
-        android:layout_centerInParent="true"
         android:layout_gravity="center"
         android:layout_margin="@dimen/activity_horizontal_margin"
         android:adjustViewBounds="false"
diff --git a/app/src/main/res/menu/menu_guess_number.xml b/app/src/main/res/menu/menu_guess_number.xml
index 54ccf56..cb7d351 100644
--- a/app/src/main/res/menu/menu_guess_number.xml
+++ b/app/src/main/res/menu/menu_guess_number.xml
@@ -4,7 +4,7 @@
     tools:context=".GuessNumberActivity">
     <item
         android:id="@+id/action_show_formula"
-        android:icon="@android:drawable/ic_lock_lock"
+        android:icon="@android:drawable/ic_menu_info_details"
         android:orderInCategory="100"
         android:title="@string/action_show_formula"
         app:showAsAction="ifRoom" />
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 6ffb2df..7b310a7 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -19,7 +19,7 @@
     <string name="action_show_formula">显示公式</string>
     <string name="show_formula_title">公式…</string>
     <string name="logo_description">图标</string>
-    <string name="about_copyright">Copyright © 2014</string>
+    <string name="about_copyright">Copyright © 2014 重庆旭恒天辰信息技术有限公司</string>
     <string name="guess_number_hint">下一个数字…</string>
 
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5675fb8..ef0a3d6 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -3,7 +3,7 @@
 
     <string name="app_name">Guess Number</string>
     <string name="action_settings">Settings</string>
-    <string name="guess_number_title">Guess the next number...</string>
+    <string name="guess_number_title">Guess the next number…</string>
     <string name="action_next_numbers">Next numbers</string>
     <string name="action_about">About</string>
     <string name="about_title">About</string>
@@ -19,6 +19,6 @@
     <string name="action_show_formula">Show formula</string>
     <string name="show_formula_title">The formula…</string>
     <string name="logo_description">The logo</string>
-    <string name="about_copyright">Copyright © 2014</string>
+    <string name="about_copyright">Copyright © 2014 www.cqxhtc.com</string>
     <string name="guess_number_hint">The next number…</string>
 </resources>
diff --git a/build.gradle b/build.gradle
index 6356aab..9405f3f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.0.0'
+        classpath 'com.android.tools.build:gradle:1.2.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files