diff --git a/app/build.gradle b/app/build.gradle
index 7fbef72..b5afaef 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,12 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.0"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.0"
     defaultConfig {
         applicationId "com.jjj.permission.utils"
         minSdkVersion 15
-        targetSdkVersion 29
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -25,11 +25,9 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 //    implementation project(path: ':permission')
     implementation 'com.github.jjjSilence:PermissionUtils:1.0.0'
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/jjj/permission/utils/MainActivity.java b/app/src/main/java/com/jjj/permission/utils/MainActivity.java
index 1c436e1..23c3681 100644
--- a/app/src/main/java/com/jjj/permission/utils/MainActivity.java
+++ b/app/src/main/java/com/jjj/permission/utils/MainActivity.java
@@ -2,13 +2,13 @@
 
 import android.Manifest;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v7.app.AppCompatActivity;
 
 import com.jjj.permission.PermissionCallback;
 import com.jjj.permission.PermissionUtils;
 import com.jjj.permissionutils.R;
 
-import androidx.annotation.NonNull;
-import androidx.appcompat.app.AppCompatActivity;
 
 public class MainActivity extends AppCompatActivity {
     private static String[] NEEDED_PERMISSIONS = new String[]{
diff --git a/gradle.properties b/gradle.properties
index 199d16e..899c3fd 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,7 +14,7 @@ org.gradle.jvmargs=-Xmx1536m
 # AndroidX package structure to make it clearer which packages are bundled with the
 # Android operating system, and which are packaged with your app's APK
 # https://developer.android.com/topic/libraries/support-library/androidx-rn
-android.useAndroidX=true
+#android.useAndroidX=true
 # Automatically convert third-party libraries to use AndroidX
-android.enableJetifier=true
+#android.enableJetifier=true
 
diff --git a/permission/build.gradle b/permission/build.gradle
index 85e82e5..f699a13 100644
--- a/permission/build.gradle
+++ b/permission/build.gradle
@@ -3,12 +3,12 @@ apply plugin: 'com.github.dcendents.android-maven'
 group = 'com.github.jjjSilence'
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.0"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.0"
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 29
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
 
@@ -27,8 +27,6 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 
-    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }
\ No newline at end of file
diff --git a/permission/src/main/java/com/jjj/permission/PermissionUtils.java b/permission/src/main/java/com/jjj/permission/PermissionUtils.java
index c483757..d1df9fa 100644
--- a/permission/src/main/java/com/jjj/permission/PermissionUtils.java
+++ b/permission/src/main/java/com/jjj/permission/PermissionUtils.java
@@ -6,9 +6,8 @@
 import android.content.DialogInterface;
 import android.content.pm.PackageManager;
 import android.graphics.Color;
-
-import androidx.core.app.ActivityCompat;
-import androidx.core.content.ContextCompat;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
 
 
 /**