diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
new file mode 100644
index 0000000..681f41a
--- /dev/null
+++ b/.idea/codeStyles/Project.xml
@@ -0,0 +1,116 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
index a92b002..cc65a36 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -2,10 +2,10 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/ImageViewPlus.iml" filepath="$PROJECT_DIR$/ImageViewPlus.iml" />
-      <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
-      <module fileurl="file://$PROJECT_DIR$/imageviewplus/imageviewplus.iml" filepath="$PROJECT_DIR$/imageviewplus/imageviewplus.iml" />
-      <module fileurl="file://$PROJECT_DIR$/sample/sample.iml" filepath="$PROJECT_DIR$/sample/sample.iml" />
+      <module fileurl="file://$PROJECT_DIR$/ImageViewPlus.iml" filepath="$PROJECT_DIR$/ImageViewPlus.iml" group="ImageViewPlus" />
+      <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" group="ImageViewPlus/app" />
+      <module fileurl="file://$PROJECT_DIR$/imageviewplus/imageviewplus.iml" filepath="$PROJECT_DIR$/imageviewplus/imageviewplus.iml" group="ImageViewPlus/imageviewplus" />
+      <module fileurl="file://$PROJECT_DIR$/sample/sample.iml" filepath="$PROJECT_DIR$/sample/sample.iml" group="ImageViewPlus/sample" />
     </modules>
   </component>
 </project>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 458d06a..1626bd7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,12 +2,18 @@
 
 buildscript {
     repositories {
+        maven { url 'https://maven.aliyun.com/repository/central' }
+        maven { url 'https://maven.aliyun.com/repository/google' }
+        maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
+        maven { url 'https://maven.aliyun.com/repository/jcenter' }
         google()
+        mavenCentral()
+        maven { url 'https://maven.google.com' }
         jcenter()
         
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.2'
+        classpath 'com.android.tools.build:gradle:3.5.2'
         
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -16,7 +22,13 @@ buildscript {
 
 allprojects {
     repositories {
+        maven { url 'https://maven.aliyun.com/repository/central' }
+        maven { url 'https://maven.aliyun.com/repository/google' }
+        maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
+        maven { url 'https://maven.aliyun.com/repository/jcenter' }
         google()
+        mavenCentral()
+        maven { url 'https://maven.google.com' }
         jcenter()
         
     }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 828c8f8..2e52786 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Aug 13 14:23:14 CST 2019
+#Fri Nov 22 15:17:36 CST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
diff --git a/imageviewplus/build.gradle b/imageviewplus/build.gradle
index 88cb99b..e4fb128 100644
--- a/imageviewplus/build.gradle
+++ b/imageviewplus/build.gradle
@@ -6,7 +6,7 @@ android {
 
 
     defaultConfig {
-        minSdkVersion 21
+        minSdkVersion 16
         targetSdkVersion 29
         versionCode 1
         versionName "1.0"
diff --git a/imageviewplus/src/main/java/com/sailflorve/imageviewplus/view/ImageViewPlus.java b/imageviewplus/src/main/java/com/sailflorve/imageviewplus/view/ImageViewPlus.java
index 3c3dc70..88b9d34 100644
--- a/imageviewplus/src/main/java/com/sailflorve/imageviewplus/view/ImageViewPlus.java
+++ b/imageviewplus/src/main/java/com/sailflorve/imageviewplus/view/ImageViewPlus.java
@@ -29,7 +29,6 @@
 import java.util.ArrayList;
 import java.util.List;
 
-
 public class ImageViewPlus extends RelativeLayout {
     private static final String TAG = "CustomImageView";
 
diff --git a/sample/build.gradle b/sample/build.gradle
index 8df52f7..1da6459 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -7,7 +7,7 @@ android {
 
     defaultConfig {
         applicationId "com.sailflorve.turbo.sample"
-        minSdkVersion 21
+        minSdkVersion 16
         targetSdkVersion 29
         versionCode 1
         versionName "1.0"