diff --git a/Live/build.gradle b/Live/build.gradle
index dad8062..37cb9a4 100644
--- a/Live/build.gradle
+++ b/Live/build.gradle
@@ -1,15 +1,14 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '26.0.2'
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
     defaultConfig {
 //        applicationId "com.frank.live"
-        minSdkVersion 15
-        targetSdkVersion 25
-        versionCode 1
-        versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
+        versionCode rootProject.ext.versionCode
+        versionName rootProject.ext.versionName
         externalNativeBuild {
             cmake {
                 cppFlags ""
@@ -34,10 +33,5 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
-        exclude group: 'com.android.support', module: 'support-annotations'
-    })
     compile 'com.android.support:appcompat-v7:25.3.1'
-    compile 'com.android.support.constraint:constraint-layout:1.0.2'
-    testCompile 'junit:junit:4.12'
 }
diff --git a/OnLive/build.gradle b/OnLive/build.gradle
index 14a7440..1f1bc32 100644
--- a/OnLive/build.gradle
+++ b/OnLive/build.gradle
@@ -1,22 +1,22 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '26.0.2'
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
 
     lintOptions {
         abortOnError false
     }
     defaultConfig {
         applicationId "com.frank.living"
-        minSdkVersion 17
-        targetSdkVersion 25
-        versionCode 1001
-        versionName "1.0.1"
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
+        versionCode rootProject.ext.versionCode
+        versionName rootProject.ext.versionName
         flavorDimensions "800400"
 
         ndk {
-            abiFilters 'armeabi', 'armeabi-v7a', 'arm64-v8a'
+            abiFilters  'armeabi-v7a', 'arm64-v8a'
         }
     }
     buildTypes {
@@ -26,8 +26,8 @@ android {
         }
     }
     productFlavors {
-        all32 { minSdkVersion 17 }
-        all64 { minSdkVersion 17 }
+        all32 { minSdkVersion rootProject.ext.minSdkVersion }
+        all64 { minSdkVersion rootProject.ext.minSdkVersion }
     }
 
     sourceSets {
diff --git a/app/build.gradle b/app/build.gradle
index 5ce1d51..30393f8 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '26.0.2'
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
     defaultConfig {
         applicationId "com.frank.ffmpeg"
-        minSdkVersion 17
-        targetSdkVersion 25
-        versionCode 1
-        versionName "1.0"
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
+        versionCode rootProject.ext.versionCode
+        versionName rootProject.ext.versionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
         externalNativeBuild {
@@ -42,10 +42,6 @@ android {
 
 dependencies {
     compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support.constraint:constraint-layout:1.0.2'
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
-        exclude group: 'com.android.support', module: 'support-annotations'
-    })
     compile 'com.android.support:appcompat-v7:25.4.0'
     compile 'com.android.support:recyclerview-v7:25.4.0'
     testCompile 'junit:junit:4.12'
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d49e98d..464cccf 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -68,6 +68,6 @@
     <string name="please_click_select">请点击右上角菜单选择文件</string>
     <string name="wrong_audio_format">非音频文件</string>
     <string name="wrong_video_format">非视频文件</string>
-    <string name="converting_video">正在反转视频...</string>
+    <string name="converting_video">正在反转视频&#8230;</string>
 
 </resources>
diff --git a/build.gradle b/build.gradle
index 0366ab0..f3dc3f8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,3 +29,12 @@ allprojects {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
+
+ext {
+    compileSdkVersion = 28
+    buildToolsVersion = '28.0.2'
+    minSdkVersion = 17
+    targetSdkVersion = 28
+    versionCode = 101000
+    versionName = "1.1.0"
+}
\ No newline at end of file