diff --git a/bin/EhViewer.apk b/bin/EhViewer.apk
index 8b430f852..65e6c812b 100644
Binary files a/bin/EhViewer.apk and b/bin/EhViewer.apk differ
diff --git a/bin/classes.dex b/bin/classes.dex
index 6f5bfbd31..6e255922b 100644
Binary files a/bin/classes.dex and b/bin/classes.dex differ
diff --git a/bin/resources.ap_ b/bin/resources.ap_
index de0835203..e9959c4f1 100644
Binary files a/bin/resources.ap_ and b/bin/resources.ap_ differ
diff --git a/res/raw/change_log b/res/raw/change_log
index 406808b13..6b4710b9d 100644
--- a/res/raw/change_log
+++ b/res/raw/change_log
@@ -1,6 +1,7 @@
 Version 0.4.2 (2014-04-04)
 * 添加内置存储空间或 Sd Card 检测
 * 修正由于 gif 格式图片导致的崩溃
+* 修正由文件夹名而可能产生的错误
 * 优化网络连接
 
 Version 0.4.1 (2014-04-02)
diff --git a/src/com/hippo/ehviewer/UpdateHelper.java b/src/com/hippo/ehviewer/UpdateHelper.java
index bca756755..18f6b86a7 100644
--- a/src/com/hippo/ehviewer/UpdateHelper.java
+++ b/src/com/hippo/ehviewer/UpdateHelper.java
@@ -29,6 +29,9 @@ import com.hippo.ehviewer.util.ThreadPool.JobContext;
 import com.hippo.ehviewer.view.AlertButton;
 import com.hippo.ehviewer.widget.DialogBuilder;
 
+
+// TODO return onFailure when downloading update or check update
+
 public class UpdateHelper {
     @SuppressWarnings("unused")
     private static final String TAG = "UpdateHelper";
@@ -40,6 +43,8 @@ public class UpdateHelper {
     private static final int GOOGLE = 0;
     private static final int QINIU = 1;
     
+    private static boolean isWorking = false;
+    
     private Activity mActivity;
     private String updateFileName;
     private OnCheckUpdateListener mListener;
@@ -70,6 +75,14 @@ public class UpdateHelper {
     }
     
     public void checkUpdate() {
+        if (isWorking) {
+            if (mListener != null)
+                mListener.onFailure("正在检查更新"); // TODO
+            return;
+        } else {
+            isWorking = true;
+        }
+        
         final AppContext appContext = (AppContext)(mActivity.getApplicationContext());
         final HttpHelper hp = new HttpHelper(mActivity.getApplicationContext());
         ThreadPool threadPool = appContext.getNetworkThreadPool();
@@ -103,6 +116,8 @@ public class UpdateHelper {
         });
     }
     
+    // TODO move dialog into listener
+    
     // TODO
     @SuppressLint("HandlerLeak")
     private Handler mHandler = new Handler() {
@@ -178,6 +193,8 @@ public class UpdateHelper {
                 if (listener != null)
                     listener.onFailure(checkUpdatePackage.hp.getEMsg());
             }
+            
+            isWorking = false;
         }
     };