diff --git a/app/build.gradle b/app/build.gradle
index 3606770..84d63f2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,8 +1,8 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.3"
+    compileSdkVersion 25
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         applicationId "com.donkingliang.imageselectdemo"
@@ -22,6 +22,6 @@ android {
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:23.4.0'
+    compile 'com.android.support:appcompat-v7:25.3.1'
     compile project(':imageselector')
 }
diff --git a/build.gradle b/build.gradle
index eebc5a9..44c64cf 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,8 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.0'
-
+        classpath 'com.android.tools.build:gradle:2.3.1'
         // 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 122a0dc..9a778d6 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
diff --git a/imageselector/build.gradle b/imageselector/build.gradle
index 20fb778..c986a01 100644
--- a/imageselector/build.gradle
+++ b/imageselector/build.gradle
@@ -1,8 +1,10 @@
 apply plugin: 'com.android.library'
 
+group='com.github.donkingliang' // 指定group，com.github.<用户名>
+
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.3"
+    compileSdkVersion 25
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         minSdkVersion 14
@@ -21,8 +23,39 @@ android {
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:23.4.0'
-    compile 'com.android.support:recyclerview-v7:23.4.0'
+    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support:recyclerview-v7:25.3.1'
     compile 'com.github.bumptech.glide:glide:3.7.0'
     compile 'com.github.chrisbanes:PhotoView:2.0.0'
 }
+
+//---------------------------------------------
+
+// 指定编码
+tasks.withType(JavaCompile) {
+    options.encoding = "UTF-8"
+}
+
+// 打包源码
+task sourcesJar(type: Jar) {
+    from android.sourceSets.main.java.srcDirs
+    classifier = 'sources'
+}
+
+task javadoc(type: Javadoc) {
+    failOnError  false
+    source = android.sourceSets.main.java.sourceFiles
+    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
+    classpath += configurations.compile
+}
+
+// 制作文档(Javadoc)
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
+artifacts {
+    archives sourcesJar
+    archives javadocJar
+}
\ No newline at end of file
diff --git a/imageselector/src/main/java/com/donkingliang/imageselector/adapter/ImagePagerAdapter.java b/imageselector/src/main/java/com/donkingliang/imageselector/adapter/ImagePagerAdapter.java
index fc18f6d..8c1df9b 100644
--- a/imageselector/src/main/java/com/donkingliang/imageselector/adapter/ImagePagerAdapter.java
+++ b/imageselector/src/main/java/com/donkingliang/imageselector/adapter/ImagePagerAdapter.java
@@ -2,6 +2,7 @@
 
 import android.content.Context;
 import android.support.v4.view.PagerAdapter;
+import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 
@@ -17,30 +18,26 @@
 public class ImagePagerAdapter extends PagerAdapter {
 
     private Context mContext;
-    private List<PhotoView> viewList = new ArrayList<>();
+    private List<PhotoView> viewList = new ArrayList<>(4);
     List<Image> mImgList;
     private OnItemClickListener mListener;
 
     public ImagePagerAdapter(Context context, List<Image> imgList) {
         this.mContext = context;
-        createImageViews(imgList);
+        createImageViews();
         mImgList = imgList;
     }
 
-    private void createImageViews(List<Image> imgList) {
-        viewList.clear();
-        if (imgList != null && !imgList.isEmpty()) {
-            int size = imgList.size();
-            for (int i = 0; i < size; i++) {
-                PhotoView imageView = new PhotoView(mContext);
-                viewList.add(imageView);
-            }
+    private void createImageViews() {
+        for (int i = 0; i < 4; i++) {
+            PhotoView imageView = new PhotoView(mContext);
+            viewList.add(imageView);
         }
     }
 
     @Override
     public int getCount() {
-        return viewList == null ? 0 : viewList.size();
+        return mImgList == null ? 0 : mImgList.size();
     }
 
     @Override
@@ -50,12 +47,17 @@ public boolean isViewFromObject(View view, Object object) {
 
     @Override
     public void destroyItem(ViewGroup container, int position, Object object) {
-        container.removeView(viewList.get(position));
+        if(object instanceof  PhotoView){
+            PhotoView view = (PhotoView)object;
+            view.setImageDrawable(null);
+            viewList.add(view);
+            container.removeView(view);
+        }
     }
 
     @Override
     public Object instantiateItem(ViewGroup container, final int position) {
-        final PhotoView currentView = viewList.get(position);
+        final PhotoView currentView = viewList.remove(0);
         final Image image = mImgList.get(position);
         container.addView(currentView);
         Glide.with(mContext).load(new File(image.getPath()))