diff --git a/.idea/compiler.xml b/.idea/compiler.xml
deleted file mode 100644
index 96cc43ef..00000000
--- a/.idea/compiler.xml
+++ /dev/null
@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CompilerConfiguration">
-    <resourceExtensions />
-    <wildcardResourcePatterns>
-      <entry name="!?*.java" />
-      <entry name="!?*.form" />
-      <entry name="!?*.class" />
-      <entry name="!?*.groovy" />
-      <entry name="!?*.scala" />
-      <entry name="!?*.flex" />
-      <entry name="!?*.kt" />
-      <entry name="!?*.clj" />
-      <entry name="!?*.aj" />
-    </wildcardResourcePatterns>
-    <annotationProcessing>
-      <profile default="true" name="Default" enabled="false">
-        <processorPath useClasspath="true" />
-      </profile>
-    </annotationProcessing>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/copyright/profiles_settings.xml b/.idea/copyright/profiles_settings.xml
deleted file mode 100644
index e7bedf33..00000000
--- a/.idea/copyright/profiles_settings.xml
+++ /dev/null
@@ -1,3 +0,0 @@
-<component name="CopyrightManager">
-  <settings default="" />
-</component>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
deleted file mode 100644
index 11a6f2e3..00000000
--- a/.idea/gradle.xml
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GradleSettings">
-    <option name="linkedExternalProjectsSettings">
-      <GradleProjectSettings>
-        <option name="distributionType" value="DEFAULT_WRAPPED" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="modules">
-          <set>
-            <option value="$PROJECT_DIR$" />
-            <option value="$PROJECT_DIR$/Aria" />
-            <option value="$PROJECT_DIR$/app" />
-          </set>
-        </option>
-        <option name="resolveModulePerSourceSet" value="false" />
-      </GradleProjectSettings>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index d2e67251..00000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,36 +0,0 @@
-<?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" />
-    <option name="myNullables">
-      <value>
-        <list size="4">
-          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
-          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
-          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
-          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
-        </list>
-      </value>
-    </option>
-    <option name="myNotNulls">
-      <value>
-        <list size="4">
-          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
-          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
-          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
-          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
-        </list>
-      </value>
-    </option>
-  </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/build/classes" />
-  </component>
-  <component name="ProjectType">
-    <option name="id" value="Android" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index 5f6de159..00000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/Aria.iml" filepath="$PROJECT_DIR$/Aria.iml" />
-      <module fileurl="file://$PROJECT_DIR$/Aria/Aria.iml" filepath="$PROJECT_DIR$/Aria/Aria.iml" />
-      <module fileurl="file://$PROJECT_DIR$/Aria/Aria-Aria.iml" filepath="$PROJECT_DIR$/Aria/Aria-Aria.iml" />
-      <module fileurl="file://$PROJECT_DIR$/AriaPrj.iml" filepath="$PROJECT_DIR$/AriaPrj.iml" />
-      <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
deleted file mode 100644
index 7f68460d..00000000
--- a/.idea/runConfigurations.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RunConfigurationProducerService">
-    <option name="ignoredProducers">
-      <set>
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
-      </set>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/Aria/build.gradle b/Aria/build.gradle
index 4f351abc..1e811256 100644
--- a/Aria/build.gradle
+++ b/Aria/build.gradle
@@ -7,8 +7,8 @@ android {
   defaultConfig {
     minSdkVersion 9
     targetSdkVersion 23
-    versionCode 312
-    versionName "3.1.2"
+    versionCode 313
+    versionName "3.1.3"
   }
   buildTypes {
     release {
@@ -23,4 +23,4 @@ dependencies {
   testCompile 'junit:junit:4.12'
   compile 'com.android.support:appcompat-v7:23.1.1'
 }
-//apply from: 'jcenter.gradle'
+apply from: 'jcenter.gradle'
diff --git a/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java b/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java
index bdccfe9c..15c10575 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java
@@ -31,7 +31,7 @@ abstract class AbsTaskQueue<TASK extends ITask, TASK_ENTITY extends ITaskEntity,
     implements ITaskQueue<TASK, TASK_ENTITY, ENTITY> {
   private final String TAG = "AbsTaskQueue";
   CachePool<TASK> mCachePool = new CachePool<>();
-  ExecutePool<TASK> mExecutePool = null;
+  ExecutePool<TASK> mExecutePool;
 
   /**
    * 获取任务执行池
diff --git a/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java b/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java
index 2430782e..21513f72 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java
@@ -32,7 +32,6 @@ public class UploadTaskQueue extends AbsTaskQueue<UploadTask, UploadTaskEntity,
   private static final String TAG = "UploadTaskQueue";
   private static volatile UploadTaskQueue INSTANCE = null;
   private static final Object LOCK = new Object();
-  private ExecutePool<UploadTask> mExecutePool = new ExecutePool<>(false);
 
   public static UploadTaskQueue getInstance() {
     if (INSTANCE == null) {
@@ -43,6 +42,9 @@ public class UploadTaskQueue extends AbsTaskQueue<UploadTask, UploadTaskEntity,
     return INSTANCE;
   }
 
+  private UploadTaskQueue() {
+    mExecutePool = new ExecutePool<>(false);
+  }
 
   @Override public void setMaxTaskNum(int newMaxNum) {
 
@@ -74,5 +76,4 @@ public class UploadTaskQueue extends AbsTaskQueue<UploadTask, UploadTaskEntity,
       Log.d(TAG, "从缓存池删除任务，删除" + (mCachePool.removeTask(task) ? "成功" : "失败"));
     }
   }
-
 }
diff --git a/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java b/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java
index 6325df0e..87fa2772 100644
--- a/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java
+++ b/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java
@@ -81,7 +81,7 @@ public class UploadActivity extends BaseActivity<ActivityUploadMeanBinding> {
   @OnClick(R.id.upload) void upload() {
     Aria.upload(this)
         .load(FILE_PATH)
-        .setUploadUrl("http://172.18.104.50:8080/upload/sign_file")
+        .setUploadUrl("http://172.18.104.228:8080/upload/sign_file")
         .setAttachment("file")
         .start();
   }