diff --git a/README.md b/README.md
index 798fa90..fcd2482 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@ Added more features to app's crash dialog, fixed custom rom deleted dialog, the
 
 此项目为 Xposed 模块，可用在任何 Android 系统中，目前仅在 **LSPosed** 中测试通过。
 
+> 最低支持 Android 8.1
+
 ## Project Reason
 
 我实在是不能理解，国内 ROM 除了 MIUI(稳定版除外) 都选择了删除应用程序崩溃的对话框(FC 对话框)，我曾以为这一直是一个特性，直到我去反编译了系统框架，才确认确实是被删掉了。
diff --git a/app/build.gradle b/app/build.gradle
index f8c6fff..83392ba 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -21,7 +21,7 @@ android {
 
     defaultConfig {
         applicationId "com.fankes.apperrorstracking"
-        minSdk 21
+        minSdk 27
         targetSdk 31
         versionCode rootProject.ext.appVersionCode
         versionName rootProject.ext.appVersionName
diff --git a/app/src/main/res/layout/activity_app_errors_detail.xml b/app/src/main/res/layout/activity_app_errors_detail.xml
index f8ce40e..3db5dac 100644
--- a/app/src/main/res/layout/activity_app_errors_detail.xml
+++ b/app/src/main/res/layout/activity_app_errors_detail.xml
@@ -28,7 +28,7 @@
             android:layout_marginEnd="20dp"
             android:src="@mipmap/ic_back"
             android:tint="@color/colorTextGray"
-            app:tooltipText="@string/back" />
+            android:tooltipText="@string/back" />
 
         <TextView
             android:layout_width="0dp"
@@ -48,7 +48,7 @@
             android:layout_marginEnd="15dp"
             android:src="@drawable/ic_print"
             android:tint="@color/colorTextGray"
-            app:tooltipText="@string/print_to_logcat" />
+            android:tooltipText="@string/print_to_logcat" />
 
         <androidx.constraintlayout.utils.widget.ImageFilterView
             android:id="@+id/copy_icon"
@@ -57,7 +57,7 @@
             android:layout_marginEnd="15dp"
             android:src="@drawable/ic_copy"
             android:tint="@color/colorTextGray"
-            app:tooltipText="@string/copy_error_stack" />
+            android:tooltipText="@string/copy_error_stack" />
 
         <androidx.constraintlayout.utils.widget.ImageFilterView
             android:id="@+id/export_icon"
@@ -66,7 +66,7 @@
             android:layout_marginEnd="10dp"
             android:src="@drawable/ic_export"
             android:tint="@color/colorTextGray"
-            app:tooltipText="@string/export_to_file" />
+            android:tooltipText="@string/export_to_file" />
     </LinearLayout>
 
     <androidx.core.widget.NestedScrollView
diff --git a/demo-app/build.gradle b/demo-app/build.gradle
index a83ab52..f31793b 100644
--- a/demo-app/build.gradle
+++ b/demo-app/build.gradle
@@ -19,7 +19,7 @@ android {
     }
 
     defaultConfig {
-        minSdk 21
+        minSdk 27
         targetSdk 31
         versionCode 1
         versionName "1.0"