diff --git a/README.md b/README.md
index 9d48ea6e..5da3fd1c 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,8 @@
 
 * 嵌套滚动布局框架：[NestedScrollLayout](https://github.com/getActivity/NestedScrollLayout) ![](https://img.shields.io/github/stars/getActivity/NestedScrollLayout.svg) ![](https://img.shields.io/github/forks/getActivity/NestedScrollLayout.svg)
 
+* Android 命令行工具集：[AndroidCmdTools](https://github.com/getActivity/AndroidCmdTools) ![](https://img.shields.io/github/stars/getActivity/AndroidCmdTools.svg) ![](https://img.shields.io/github/forks/getActivity/AndroidCmdTools.svg)
+
 * Android 版本适配：[AndroidVersionAdapter](https://github.com/getActivity/AndroidVersionAdapter) ![](https://img.shields.io/github/stars/getActivity/AndroidVersionAdapter.svg) ![](https://img.shields.io/github/forks/getActivity/AndroidVersionAdapter.svg)
 
 * Android 代码规范：[AndroidCodeStandard](https://github.com/getActivity/AndroidCodeStandard) ![](https://img.shields.io/github/stars/getActivity/AndroidCodeStandard.svg) ![](https://img.shields.io/github/forks/getActivity/AndroidCodeStandard.svg)
diff --git a/gradle.properties b/gradle.properties
index 10158240..c324c2de 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -21,4 +21,7 @@ android.useAndroidX = true
 android.enableJetifier = true
 
 # Use transitive R class for backward compatibility with old code
-android.nonTransitiveRClass=false
\ No newline at end of file
+android.nonTransitiveRClass=false
+
+# Turn off the full mode of R8 to prevent the reflection code from being overly optimized
+android.enableR8.fullMode=false
\ No newline at end of file
diff --git a/library/umengSdk/src/main/java/com/hjq/umeng/sdk/UmengClient.java b/library/umengSdk/src/main/java/com/hjq/umeng/sdk/UmengClient.java
index 07d55421..db5cacb9 100644
--- a/library/umengSdk/src/main/java/com/hjq/umeng/sdk/UmengClient.java
+++ b/library/umengSdk/src/main/java/com/hjq/umeng/sdk/UmengClient.java
@@ -97,10 +97,12 @@ public static void login(@NonNull Activity activity, @NonNull Platform platform,
         }
 
         try {
-            // 删除旧的第三方登录授权
-            UMShareAPI.get(activity).deleteOauth(activity, platform.getThirdParty(), null);
-            // 要先等上面的代码执行完毕之后
-            Thread.sleep(200);
+            if (UMShareAPI.get(activity).isAuthorize(activity, platform.getThirdParty())) {
+                // 删除旧的第三方登录授权
+                UMShareAPI.get(activity).deleteOauth(activity, platform.getThirdParty(), null);
+                // 要先等上面的代码执行完毕之后
+                Thread.sleep(200);
+            }
             // 开启新的第三方登录授权
             UMShareAPI.get(activity).getPlatformInfo(activity, platform.getThirdParty(), new UmengLogin.LoginListenerWrapper(platform.getThirdParty(), listener));
         } catch (InterruptedException e) {