diff --git a/DotEngineExample/build.gradle b/DotEngineExample/build.gradle
index dc60b82..c37e72f 100644
--- a/DotEngineExample/build.gradle
+++ b/DotEngineExample/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 24
-    buildToolsVersion '26.0.2'
+    compileSdkVersion 26
+    buildToolsVersion '28.0.3'
 
     defaultConfig {
         applicationId "cc.dot.engine.example"
         minSdkVersion 16
-        targetSdkVersion 24
+        targetSdkVersion 26
         versionCode 1
         versionName "1.0"
         multiDexEnabled true
@@ -33,9 +33,9 @@ allprojects {
 
 dependencies {
 
-    compile(name:'DotEngine-release', ext:'aar')
-    compile 'com.android.support:appcompat-v7:24.0.0'
-    compile 'com.squareup.okhttp3:okhttp:3.6.0'
-    compile 'com.orhanobut:logger:2.1.1'
+    implementation(name:'DotEngine-release', ext:'aar')
+    implementation 'com.android.support:appcompat-v7:24.0.0'
+    implementation 'com.squareup.okhttp3:okhttp:3.6.0'
+    implementation 'com.orhanobut:logger:2.1.1'
 
 }
diff --git a/DotEngineExample/src/main/AndroidManifest.xml b/DotEngineExample/src/main/AndroidManifest.xml
index 26d6c66..001cf48 100644
--- a/DotEngineExample/src/main/AndroidManifest.xml
+++ b/DotEngineExample/src/main/AndroidManifest.xml
@@ -4,9 +4,6 @@
           android:versionCode="1"
           android:versionName="1.0">
 
-    <uses-sdk
-        android:minSdkVersion="15"
-        android:targetSdkVersion="21"/>
 
     <uses-feature android:name="android.hardware.camera"/>
     <uses-feature android:name="android.hardware.camera.autofocus"/>
diff --git a/DotEngineExample/src/main/java/cc/dot/engine/example/CropVideoActivity.java b/DotEngineExample/src/main/java/cc/dot/engine/example/CropVideoActivity.java
index e6180c7..ac0760d 100644
--- a/DotEngineExample/src/main/java/cc/dot/engine/example/CropVideoActivity.java
+++ b/DotEngineExample/src/main/java/cc/dot/engine/example/CropVideoActivity.java
@@ -17,6 +17,7 @@
 import cc.dot.engine.DotEngine;
 import cc.dot.engine.DotStream;
 import cc.dot.engine.DotView;
+import cc.dot.engine.audio.DotAudioManager;
 import cc.dot.engine.listener.DotEngineListener;
 import cc.dot.engine.listener.DotStreamListener;
 import cc.dot.engine.type.DotEngineErrorType;
@@ -297,6 +298,11 @@ public void onStateChange(DotEngineStatus dotEngineStatus) {
 
             }
         }
+
+        @Override
+        public void onAudioDeviceChanged(DotAudioManager.AudioDevice device) {
+
+        }
     };
 
 
diff --git a/README.md b/README.md
index 46bf075..dec481b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # dotEngine sdk android  
 
-dotEngine 音视频实时通话SDK. 应用场景一对一通话, 多对多通话, 一对多直播, 连麦直播, 抓娃娃, 支持定制以及二次开发
+dotEngine 音视频实时通话SDK. 应用场景一对一通话, 多对多通话, 一对多直播, 连麦直播, 抓娃娃, 视频客服, 远程问诊, 支持定制以及二次开发
 
 
 ## 特点 
@@ -19,6 +19,9 @@ dotEngine 音视频实时通话SDK. 应用场景一对一通话, 多对多通话
 - 视频渲染支持全显示以及填充模式
 - 断网重连
 - Simulcast
+- 屏幕共享 **需要Android5.0+**
+- 视频录制
+- 支持TCP模式
 
 ## 使用
 
@@ -46,5 +49,3 @@ docs[http://docs.dot.cc]
 邮箱: leeoxiang@gmail.com
 
 
-
-
diff --git a/build.gradle b/build.gradle
index c095292..3f6e6c1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath 'com.android.tools.build:gradle:3.4.1'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 5051615..363b1b6 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 01 00:37:35 CST 2018
+#Tue Jun 11 16:00:12 CST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip