diff --git a/.idea/misc.xml b/.idea/misc.xml
index 7158618..cc72de3 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,8 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="EntryPointsManager">
-    <entry_points version="2.0" />
-  </component>
   <component name="NullableNotNullManager">
     <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
     <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
@@ -27,17 +24,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectLevelVcsManager" settingsEditedManually="false">
-    <OptionsSetting value="true" id="Add" />
-    <OptionsSetting value="true" id="Remove" />
-    <OptionsSetting value="true" id="Checkout" />
-    <OptionsSetting value="true" id="Update" />
-    <OptionsSetting value="true" id="Status" />
-    <OptionsSetting value="true" id="Edit" />
-    <ConfirmationsSetting value="0" id="Add" />
-    <ConfirmationsSetting value="0" id="Remove" />
-  </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/.idea/modules.xml b/.idea/modules.xml
index 199f6ef..8d269fd 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -3,8 +3,11 @@
   <component name="ProjectModuleManager">
     <modules>
       <module fileurl="file://$PROJECT_DIR$/QrCodeUtils.iml" filepath="$PROJECT_DIR$/QrCodeUtils.iml" />
+      <module fileurl="file://F:\githubProj\QrCodeUtils\QrCodeUtils.iml" filepath="F:\githubProj\QrCodeUtils\QrCodeUtils.iml" />
       <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
+      <module fileurl="file://F:\githubProj\QrCodeUtils\app\app.iml" filepath="F:\githubProj\QrCodeUtils\app\app.iml" />
       <module fileurl="file://$PROJECT_DIR$/qrcodelib/qrcodelib.iml" filepath="$PROJECT_DIR$/qrcodelib/qrcodelib.iml" />
+      <module fileurl="file://F:\githubProj\QrCodeUtils\qrcodelib\qrcodelib.iml" filepath="F:\githubProj\QrCodeUtils\qrcodelib\qrcodelib.iml" />
     </modules>
   </component>
 </project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 9db0f3e..b205a61 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,12 +1,11 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion 26
     defaultConfig {
         applicationId "com.yunzhou.qrcodeutils"
         minSdkVersion 19
-        targetSdkVersion 25
+        targetSdkVersion 26
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -24,7 +23,7 @@ dependencies {
     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:appcompat-v7:26.0.1'
     compile 'com.android.support.constraint:constraint-layout:1.0.2'
     testCompile 'junit:junit:4.12'
     compile project(':qrcodelib')
diff --git a/build.gradle b/build.gradle
index c2eea8e..f3ead4d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.0.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -14,6 +14,7 @@ buildscript {
 
 allprojects {
     repositories {
+        google()
         jcenter()
     }
 }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a825b3c..d687bed 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Oct 12 13:00:20 CST 2017
+#Thu Jan 11 19:11:32 CST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
diff --git a/qrcodelib/build.gradle b/qrcodelib/build.gradle
index 0a9ce12..aafd2c1 100644
--- a/qrcodelib/build.gradle
+++ b/qrcodelib/build.gradle
@@ -1,12 +1,11 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion 26
 
     defaultConfig {
         minSdkVersion 19
-        targetSdkVersion 25
+        targetSdkVersion 26
         versionCode 1
         versionName "1.0"
 
@@ -21,6 +20,6 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support:appcompat-v7:26.0.1'
     compile 'com.google.zxing:core:3.3.0'
 }
diff --git a/qrcodelib/src/main/java/com/yunzhou/qrcodelib/zxing/encoding/EncodingUtils.java b/qrcodelib/src/main/java/com/yunzhou/qrcodelib/zxing/encoding/EncodingUtils.java
index f95ee25..06a349d 100644
--- a/qrcodelib/src/main/java/com/yunzhou/qrcodelib/zxing/encoding/EncodingUtils.java
+++ b/qrcodelib/src/main/java/com/yunzhou/qrcodelib/zxing/encoding/EncodingUtils.java
@@ -42,6 +42,8 @@ public static Bitmap createQRCode(String content, int widthPix, int heightPix, B
             hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
             // 容错级别
             hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
+            // 设置二维码边距
+            hints.put(EncodeHintType.MARGIN, 0);
             // 图像数据转换，使用了矩阵转换
             BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix,
                     heightPix, hints);