diff --git a/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxNoHttp.java b/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxNoHttp.java
index 5ef3210..c9e3d73 100644
--- a/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxNoHttp.java
+++ b/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxNoHttp.java
@@ -31,7 +31,6 @@
  */
 class RxNoHttp {
     private static RxNoHttp rxNoHttp;
-    private Dialog dialog = null;
 
     private RxNoHttp() {
 
@@ -45,81 +44,75 @@ synchronized static RxNoHttp getRxNoHttp() {
      * 通过nohttp去请求
      *
      * @param mDialogGetListener dialog获取接口
-     * @param responseInterfa   请求成功或者失败回调对象
+     * @param responseInterfa    请求成功或者失败回调对象
      */
-    <T> void request(final ProtocolRequest<?,T> request, DialogGetListener mDialogGetListener, final OnIsRequestListener<T> responseInterfa) {
-        if (null != mDialogGetListener)
-            dialog = mDialogGetListener.getDialog();
-
-        if (null != dialog)
-            dialog.show();
+    <T> void request(final ProtocolRequest<?, T> request, DialogGetListener mDialogGetListener, final OnIsRequestListener<T> responseInterfa) {
+        final Dialog dialog = null == mDialogGetListener ? null : mDialogGetListener.getDialog();
+        if (null != dialog&&!dialog.isShowing()) {
+            try {
+                dialog.show();
+            } catch (Exception e) {
+                Logger.e("Dialog-显示异常：由于Dialog依赖的Context不是栈顶。");
+            }
+        }
 
         Observable.create(new Observable.OnSubscribe<Response<T>>() {
             @Override
             public void call(Subscriber<? super Response<T>> subscriberOut) {
                 // 最关键的就是用NoHttp的同步请求请求到response了，其它的都是rxjava做的，跟nohttp无关的。
                 Response<T> response = NoHttp.startRequestSync(request);
-//                byte[] oo=new byte[12];
-//                try {
-//                    response.request().parseResponse(response.getHeaders(),oo);
-//                } catch (Exception e) {
-//                    e.printStackTrace();
-//                }
-
-                if (response.isSucceed()||response.isFromCache()) {
+                if (response.isSucceed() || response.isFromCache()) {
                     subscriberOut.onNext(response);
-                }
-                else {
+                } else {
                     subscriberOut.onError(response.getException());
                 }
-                subscriberOut.onCompleted();
+
             }
         }).subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(new Subscriber<Response<T>>() {
                     @Override
                     public void onCompleted() {
-                        if (null != dialog) {
-                            if (dialog.isShowing()) {
-                                dialog.dismiss();
-                            }
-                            dialog = null;
-                        }
+
                     }
 
                     @Override
                     public void onError(Throwable e) {
                         // 关闭dialog.
-                        if (null != dialog) {
-                            if (dialog.isShowing()) {
+                        if (null != dialog && dialog.isShowing()) {
+                            try {
                                 dialog.dismiss();
+                            } catch (Exception e1) {
+                                Logger.e("Dialog-关闭异常：由于Dialog已经关闭或者依赖的Context不存在");
                             }
-                            // 提示异常信息。
-                            if (e instanceof NetworkError) {// 网络不好
-                                show(R.string.error_please_check_network);
-                            } else if (e instanceof TimeoutError) {// 请求超时
-                                show(R.string.error_timeout);
-                            } else if (e instanceof UnKnownHostError) {// 找不到服务器
-                                show(R.string.error_not_found_server);
-                            } else if (e instanceof URLError) {// URL是错的
-                                show(R.string.error_url_error);
-                            } else if (e instanceof NotFoundCacheError) {
-                                // 这个异常只会在仅仅查找缓存时没有找到缓存时返回
-                                show(R.string.error_not_found_cache);
-                            } else if (e instanceof ProtocolException) {
-                                show(R.string.error_system_unsupport_method);
-                            } else {
-                                Logger.e("NoHttpUtils捕获异常："+e.toString());
-                                StackTraceElement[] stackTrace = e.getStackTrace();
-                                if (null!=stackTrace) {
-                                    for (StackTraceElement traceElement : stackTrace) {
-                                        Logger.e("NoHttpUtils捕获异常："+traceElement.toString());
-                                    }
+                        }
+
+                        // 提示异常信息。
+                        if (e instanceof NetworkError) {// 网络不好
+                            show(dialog, R.string.error_please_check_network);
+                        } else if (e instanceof TimeoutError) {// 请求超时
+                            show(dialog, R.string.error_timeout);
+                        } else if (e instanceof UnKnownHostError) {// 找不到服务器
+                            show(dialog, R.string.error_not_found_server);
+                        } else if (e instanceof URLError) {// URL是错的
+                            show(dialog, R.string.error_url_error);
+                        } else if (e instanceof NotFoundCacheError) {
+                            // 这个异常只会在仅仅查找缓存时没有找到缓存时返回
+                            show(dialog, R.string.error_not_found_cache);
+                        } else if (e instanceof ProtocolException) {
+                            show(dialog, R.string.error_system_unsupport_method);
+                        } else {
+                            Logger.e("NoHttpUtils捕获异常：" + e.toString());
+                            StackTraceElement[] stackTrace = e.getStackTrace();
+                            if (null != stackTrace) {
+                                for (StackTraceElement traceElement : stackTrace) {
+                                    Logger.e("NoHttpUtils捕获异常：" + traceElement.toString());
                                 }
-                                show(R.string.error_unknow);
                             }
-                            dialog = null;
+                            show(dialog, R.string.error_unknow);
                         }
+
+
                         if (null != responseInterfa) {
                             responseInterfa.onError(e);
                         }
@@ -127,6 +120,15 @@ public void onError(Throwable e) {
 
                     @Override
                     public void onNext(Response<T> tResponse) {
+                        // 关闭dialog.
+                        if (null != dialog && dialog.isShowing()) {
+                            try {
+                                dialog.dismiss();
+                            } catch (Exception e1) {
+                                Logger.e("Dialog-关闭异常：由于Dialog已经关闭或者依赖的Context不存在");
+                            }
+                        }
+
                         if (null != responseInterfa) {
                             responseInterfa.onNext(tResponse.get());
                         }
@@ -139,8 +141,10 @@ public void onNext(Response<T> tResponse) {
      *
      * @param stringId 提示内容资源ID
      */
-    private void show(int stringId) {
-        Context context = dialog.getContext();
-        Toast.makeText(context, context.getResources().getString(stringId), Toast.LENGTH_SHORT).show();
+    private void show(Dialog dialog, int stringId) {
+        if (null != dialog) {
+            Context context = dialog.getContext();
+            Toast.makeText(context, context.getResources().getString(stringId), Toast.LENGTH_SHORT).show();
+        }
     }
 }
diff --git a/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxThreadInterchange.java b/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxThreadInterchange.java
index 51f7e0a..4fcc4a3 100644
--- a/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxThreadInterchange.java
+++ b/nohttputils/src/main/java/com/liqi/nohttputils/nohttp/RxThreadInterchange.java
@@ -129,8 +129,12 @@ private <T> void runRequest(final RxRequestModel<T> baseRxRequestModel) {
         if (null != baseRxRequestModel) {
 
             Dialog dialog = getDialog(baseRxRequestModel);
-            if (null != dialog) {
-                dialog.show();
+            if (null != dialog&&!dialog.isShowing()) {
+                try {
+                    dialog.show();
+                } catch (Exception e) {
+                    Logger.e("Dialog-显示异常：由于Dialog依赖的Context不是栈顶。");
+                }
             }
 
             Observable.create(baseRxRequestModel)
@@ -145,7 +149,11 @@ public void onCompleted() {
                         public void onError(Throwable e) {
                             Dialog dialog = getDialog(baseRxRequestModel);
                             if (null != dialog && dialog.isShowing()) {
-                                dialog.dismiss();
+                                try {
+                                    dialog.dismiss();
+                                } catch (Exception e1) {
+                                    Logger.e("Dialog-关闭异常：由于Dialog已经关闭或者依赖的Context不存在");
+                                }
                             }
 
                             // 提示异常信息。
@@ -190,7 +198,11 @@ public void onError(Throwable e) {
                         public void onNext(T t) {
                             Dialog dialog = getDialog(baseRxRequestModel);
                             if (null != dialog && dialog.isShowing()) {
-                                dialog.dismiss();
+                                try {
+                                    dialog.dismiss();
+                                } catch (Exception e) {
+                                    Logger.e("Dialog-关闭异常：由于Dialog已经关闭或者依赖的Context不存在");
+                                }
                             }
 
                             OnIsRequestListener<T> onIsRequestListener = baseRxRequestModel.getOnIsRequestListener();