diff --git a/app/build.gradle b/app/build.gradle
index 8b564492b..73d501ed4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -27,9 +27,9 @@ dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     implementation project(path: ':library')
     implementation project(':material-spinner-1.0.5')
-    implementation 'com.google.android.material:material:1.0.0'
-    implementation 'androidx.cardview:cardview:1.0.0'
-    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'com.android.support:design:28.0.0'
+    implementation 'com.android.support:cardview-v7:28.0.0'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'com.kyleduo.switchbutton:library:2.0.0'
     implementation 'com.orhanobut:logger:2.2.0'
 }
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/AnimationUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/AnimationUseActivity.java
index a8e83267d..dad382d42 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/AnimationUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/AnimationUseActivity.java
@@ -2,8 +2,8 @@
 
 import android.app.Activity;
 import android.os.Bundle;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.CompoundButton;
 import android.widget.ImageView;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/DataBindingUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/DataBindingUseActivity.java
index 984e1125c..3acf9acbb 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/DataBindingUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/DataBindingUseActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 
 import com.chad.baserecyclerviewadapterhelper.adapter.DataBindingUseAdapter;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/EmptyViewUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/EmptyViewUseActivity.java
index 57163bdf5..59b01d54b 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/EmptyViewUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/EmptyViewUseActivity.java
@@ -2,8 +2,8 @@
 
 import android.os.Bundle;
 import android.os.Handler;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ExpandableUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ExpandableUseActivity.java
index 3bacfdeb6..5afccd64e 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ExpandableUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ExpandableUseActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
 
 import com.chad.baserecyclerviewadapterhelper.adapter.ExpandableItemAdapter;
 import com.chad.baserecyclerviewadapterhelper.base.BaseActivity;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HeaderAndFooterUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HeaderAndFooterUseActivity.java
index ce4bbcd05..fba78f959 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HeaderAndFooterUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HeaderAndFooterUseActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HomeActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HomeActivity.java
index e675ff593..5e8f58d0a 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HomeActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/HomeActivity.java
@@ -2,9 +2,9 @@
 
 import android.content.Intent;
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemClickActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemClickActivity.java
index f00fe7f8a..a8f97b1ea 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemClickActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemClickActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.util.Log;
 import android.view.MotionEvent;
 import android.view.View;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemDragAndSwipeUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemDragAndSwipeUseActivity.java
index 3fc1e45f0..9d9abcb52 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemDragAndSwipeUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/ItemDragAndSwipeUseActivity.java
@@ -4,10 +4,10 @@
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.os.Bundle;
-import androidx.core.content.ContextCompat;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
-import androidx.recyclerview.widget.ItemTouchHelper;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
 import android.util.Log;
 import android.view.View;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemRvAdapterUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemRvAdapterUseActivity.java
index ddd5bd346..099522b98 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemRvAdapterUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemRvAdapterUseActivity.java
@@ -1,8 +1,11 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.util.Log;
+import android.view.View;
+import android.widget.Toast;
 
 import com.chad.baserecyclerviewadapterhelper.adapter.DemoMultipleItemRvAdapter;
 import com.chad.baserecyclerviewadapterhelper.base.BaseActivity;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemUseActivity.java
index a6c89d339..9bbfd0606 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/MultipleItemUseActivity.java
@@ -1,9 +1,11 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v4.widget.DrawerLayout;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+import android.view.ViewGroup;
 
 import com.chad.baserecyclerviewadapterhelper.adapter.MultipleItemQuickAdapter;
 import com.chad.baserecyclerviewadapterhelper.base.BaseActivity;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/PullToRefreshUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/PullToRefreshUseActivity.java
index 7f4d38157..e0dd04a1d 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/PullToRefreshUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/PullToRefreshUseActivity.java
@@ -4,9 +4,9 @@
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v4.widget.SwipeRefreshLayout;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionMultipleItemUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionMultipleItemUseActivity.java
index 2155ea7b7..4207d4087 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionMultipleItemUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionMultipleItemUseActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.Toast;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionUseActivity.java
index 0fb59b520..15b9f6372 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/SectionUseActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.Toast;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/UpFetchUseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/UpFetchUseActivity.java
index 92fe89263..22f9438e2 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/UpFetchUseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/UpFetchUseActivity.java
@@ -1,8 +1,8 @@
 package com.chad.baserecyclerviewadapterhelper;
 
 import android.os.Bundle;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 
 import com.chad.baserecyclerviewadapterhelper.adapter.UpFetchAdapter;
 import com.chad.baserecyclerviewadapterhelper.base.BaseActivity;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/WelcomeActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/WelcomeActivity.java
index f7b939b56..ec0f87a2b 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/WelcomeActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/WelcomeActivity.java
@@ -3,7 +3,7 @@
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
-import androidx.appcompat.app.AppCompatActivity;
+import android.support.v7.app.AppCompatActivity;
 
 public class WelcomeActivity extends AppCompatActivity {
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DataBindingUseAdapter.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DataBindingUseAdapter.java
index f24c3060e..6e5459927 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DataBindingUseAdapter.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DataBindingUseAdapter.java
@@ -1,7 +1,7 @@
 package com.chad.baserecyclerviewadapterhelper.adapter;
 
-import androidx.databinding.DataBindingUtil;
-import androidx.databinding.ViewDataBinding;
+import android.databinding.DataBindingUtil;
+import android.databinding.ViewDataBinding;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DemoMultipleItemRvAdapter.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DemoMultipleItemRvAdapter.java
index fa4e109d9..40b0e1bdd 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DemoMultipleItemRvAdapter.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/DemoMultipleItemRvAdapter.java
@@ -1,6 +1,6 @@
 package com.chad.baserecyclerviewadapterhelper.adapter;
 
-import androidx.annotation.Nullable;
+import android.support.annotation.Nullable;
 
 import com.chad.baserecyclerviewadapterhelper.adapter.provider.ImgItemProvider;
 import com.chad.baserecyclerviewadapterhelper.adapter.provider.TextImgItemProvider;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/ItemClickAdapter.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/ItemClickAdapter.java
index f156db6e9..1769b1ca9 100755
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/ItemClickAdapter.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/ItemClickAdapter.java
@@ -1,7 +1,7 @@
 package com.chad.baserecyclerviewadapterhelper.adapter;
 
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.Toast;
 
@@ -53,7 +53,7 @@ protected void convert(final BaseViewHolder helper, final ClickEntity item) {
             case ClickEntity.NEST_CLICK_ITEM_CHILD_VIEW:
                 helper.setNestView(R.id.item_click); // u can set nestview id
                 final RecyclerView recyclerView = helper.getView(R.id.nest_list);
-                recyclerView.setLayoutManager(new LinearLayoutManager(helper.itemView.getContext(), RecyclerView.VERTICAL, false));
+                recyclerView.setLayoutManager(new LinearLayoutManager(helper.itemView.getContext(), LinearLayoutManager.VERTICAL, false));
                 recyclerView.setHasFixedSize(true);
 
                 nestAdapter = new NestAdapter();
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseActivity.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseActivity.java
index 1e54dc9e4..27dd52edc 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseActivity.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseActivity.java
@@ -2,8 +2,8 @@
 
 import android.os.Build;
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.appcompat.widget.Toolbar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowManager;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseBindingViewHolder.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseBindingViewHolder.java
index 47e139c22..e9ed97d0a 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseBindingViewHolder.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseBindingViewHolder.java
@@ -1,6 +1,6 @@
 package com.chad.baserecyclerviewadapterhelper.base;
 
-import androidx.databinding.ViewDataBinding;
+import android.databinding.ViewDataBinding;
 import android.view.View;
 
 import com.chad.library.adapter.base.BaseViewHolder;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseDataBindingAdapter.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseDataBindingAdapter.java
index ab0932f2b..0fbf329e2 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseDataBindingAdapter.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/base/BaseDataBindingAdapter.java
@@ -1,9 +1,9 @@
 package com.chad.baserecyclerviewadapterhelper.base;
 
-import androidx.databinding.DataBindingUtil;
-import androidx.databinding.ViewDataBinding;
-import androidx.annotation.LayoutRes;
-import androidx.annotation.Nullable;
+import android.databinding.DataBindingUtil;
+import android.databinding.ViewDataBinding;
+import android.support.annotation.LayoutRes;
+import android.support.annotation.Nullable;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridItemDecoration.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridItemDecoration.java
index f14536f8b..c1b3e0de3 100755
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridItemDecoration.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridItemDecoration.java
@@ -4,8 +4,8 @@
 import android.graphics.Canvas;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 
 /**
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridSectionAverageGapItemDecoration.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridSectionAverageGapItemDecoration.java
index 241572c9c..b265248cc 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridSectionAverageGapItemDecoration.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/decoration/GridSectionAverageGapItemDecoration.java
@@ -2,6 +2,8 @@
 
 import android.graphics.Rect;
 import android.os.Build;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.util.DisplayMetrics;
 import android.util.TypedValue;
 import android.view.View;
@@ -11,9 +13,6 @@
 import com.chad.library.adapter.base.BaseViewHolder;
 import com.chad.library.adapter.base.entity.SectionEntity;
 
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
-
 /**
  * 应用于RecyclerView的GridLayoutManager，水平方向上固定间距大小，从而使条目宽度自适应。<br>
  * 配合Brvah的Section使用，不对Head生效，仅对每个Head的子Grid列表生效<br>
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/SpannableStringUtils.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/SpannableStringUtils.java
index 88aa180fa..48103c66f 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/SpannableStringUtils.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/SpannableStringUtils.java
@@ -5,10 +5,10 @@
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
-import androidx.annotation.ColorInt;
-import androidx.annotation.DrawableRes;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
+import android.support.annotation.ColorInt;
+import android.support.annotation.DrawableRes;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.text.Layout.Alignment;
 import android.text.SpannableStringBuilder;
 import android.text.Spanned;
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/ToastUtils.java b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/ToastUtils.java
index 262299e81..ca7b920b2 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/ToastUtils.java
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/util/ToastUtils.java
@@ -2,7 +2,7 @@
 
 import android.os.Handler;
 import android.os.Looper;
-import androidx.annotation.StringRes;
+import android.support.annotation.StringRes;
 import android.widget.Toast;
 
 public class ToastUtils {
diff --git a/app/src/main/res/layout/activity_adapter_use.xml b/app/src/main/res/layout/activity_adapter_use.xml
index 4dd6a9982..31c2f5bb0 100644
--- a/app/src/main/res/layout/activity_adapter_use.xml
+++ b/app/src/main/res/layout/activity_adapter_use.xml
@@ -63,7 +63,7 @@
     </LinearLayout>
 
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
diff --git a/app/src/main/res/layout/activity_choose_multiple_item_use_type.xml b/app/src/main/res/layout/activity_choose_multiple_item_use_type.xml
index 37c406093..62e991187 100644
--- a/app/src/main/res/layout/activity_choose_multiple_item_use_type.xml
+++ b/app/src/main/res/layout/activity_choose_multiple_item_use_type.xml
@@ -7,7 +7,7 @@
     android:gravity="center_vertical"
     android:orientation="vertical">
 
-    <androidx.cardview.widget.CardView
+    <android.support.v7.widget.CardView
         android:id="@+id/card_view1"
         android:layout_width="match_parent"
         android:layout_height="150dp"
@@ -45,9 +45,9 @@
 
         </LinearLayout>
 
-    </androidx.cardview.widget.CardView>
+    </android.support.v7.widget.CardView>
 
-    <androidx.cardview.widget.CardView
+    <android.support.v7.widget.CardView
         android:id="@+id/card_view2"
         android:layout_width="match_parent"
         android:layout_height="150dp"
@@ -85,6 +85,6 @@
                 />
 
         </LinearLayout>
-    </androidx.cardview.widget.CardView>
+    </android.support.v7.widget.CardView>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_data_binding_use.xml b/app/src/main/res/layout/activity_data_binding_use.xml
index ce25cac00..68c31c7c0 100644
--- a/app/src/main/res/layout/activity_data_binding_use.xml
+++ b/app/src/main/res/layout/activity_data_binding_use.xml
@@ -7,7 +7,7 @@
     android:background="@color/bg"
     tools:context="com.chad.baserecyclerviewadapterhelper.DataBindingUseActivity">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
diff --git a/app/src/main/res/layout/activity_empty_view_use.xml b/app/src/main/res/layout/activity_empty_view_use.xml
index 1779c3bb1..89e07de36 100644
--- a/app/src/main/res/layout/activity_empty_view_use.xml
+++ b/app/src/main/res/layout/activity_empty_view_use.xml
@@ -7,7 +7,7 @@
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context=".EmptyViewUseActivity">
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
+    <android.support.design.widget.FloatingActionButton
         android:id="@+id/btn_reset"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -17,7 +17,7 @@
         android:layout_gravity="end|bottom"
         />
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
diff --git a/app/src/main/res/layout/activity_expandable_item_use.xml b/app/src/main/res/layout/activity_expandable_item_use.xml
index ddd4b14d0..618c26384 100644
--- a/app/src/main/res/layout/activity_expandable_item_use.xml
+++ b/app/src/main/res/layout/activity_expandable_item_use.xml
@@ -5,7 +5,7 @@
               android:background="@color/bg"
               android:orientation="vertical">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
diff --git a/app/src/main/res/layout/activity_header_and_footer_use.xml b/app/src/main/res/layout/activity_header_and_footer_use.xml
index 609fe08b5..a028223ca 100644
--- a/app/src/main/res/layout/activity_header_and_footer_use.xml
+++ b/app/src/main/res/layout/activity_header_and_footer_use.xml
@@ -5,7 +5,7 @@
               android:background="@color/bg"
               android:orientation="vertical">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
diff --git a/app/src/main/res/layout/activity_home.xml b/app/src/main/res/layout/activity_home.xml
index 7aa764211..549e55ebd 100644
--- a/app/src/main/res/layout/activity_home.xml
+++ b/app/src/main/res/layout/activity_home.xml
@@ -6,7 +6,7 @@
               android:background="@color/bg"
               android:orientation="vertical">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
diff --git a/app/src/main/res/layout/activity_item_click.xml b/app/src/main/res/layout/activity_item_click.xml
index f2251d0f0..0a941e2a6 100644
--- a/app/src/main/res/layout/activity_item_click.xml
+++ b/app/src/main/res/layout/activity_item_click.xml
@@ -9,7 +9,7 @@
     android:focusableInTouchMode="true"
     tools:context="com.chad.baserecyclerviewadapterhelper.ItemClickActivity">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/list"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
diff --git a/app/src/main/res/layout/activity_item_touch_use.xml b/app/src/main/res/layout/activity_item_touch_use.xml
index abf752a92..111125cf2 100644
--- a/app/src/main/res/layout/activity_item_touch_use.xml
+++ b/app/src/main/res/layout/activity_item_touch_use.xml
@@ -5,7 +5,7 @@
               android:layout_height="match_parent"
               android:background="@color/bg"
     >
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 9c49c9646..d9ce3768a 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -6,17 +6,17 @@
 
 
 
-    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+    <android.support.v4.widget.SwipeRefreshLayout
         android:id="@+id/swipeLayout"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical"
         >
 
-        <androidx.recyclerview.widget.RecyclerView
+        <android.support.v7.widget.RecyclerView
             android:id="@+id/rv_list"
             android:layout_width="match_parent"
             android:layout_height="match_parent"/>
-    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+    </android.support.v4.widget.SwipeRefreshLayout>
 
 </FrameLayout>
diff --git a/app/src/main/res/layout/activity_multiple_item_use.xml b/app/src/main/res/layout/activity_multiple_item_use.xml
index d8d109bf3..35f3f927e 100644
--- a/app/src/main/res/layout/activity_multiple_item_use.xml
+++ b/app/src/main/res/layout/activity_multiple_item_use.xml
@@ -7,7 +7,7 @@
               android:background="@color/bg"
               android:orientation="vertical">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
diff --git a/app/src/main/res/layout/activity_section_uer.xml b/app/src/main/res/layout/activity_section_uer.xml
index 7c11364cb..cb4608c04 100644
--- a/app/src/main/res/layout/activity_section_uer.xml
+++ b/app/src/main/res/layout/activity_section_uer.xml
@@ -6,7 +6,7 @@
     android:layout_height="match_parent"
     android:background="@color/bg"
     tools:context=".SectionUseActivity">
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
diff --git a/app/src/main/res/layout/def_section_head.xml b/app/src/main/res/layout/def_section_head.xml
index d4c376845..8ba2cc8e0 100755
--- a/app/src/main/res/layout/def_section_head.xml
+++ b/app/src/main/res/layout/def_section_head.xml
@@ -1,4 +1,4 @@
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
     android:id="@+id/card_view"
@@ -43,4 +43,4 @@
             android:textSize="18sp"/>
     </LinearLayout>
 
-</androidx.cardview.widget.CardView>
+</android.support.v7.widget.CardView>
diff --git a/app/src/main/res/layout/home_item_view.xml b/app/src/main/res/layout/home_item_view.xml
index 21842a60b..6d0cb5151 100755
--- a/app/src/main/res/layout/home_item_view.xml
+++ b/app/src/main/res/layout/home_item_view.xml
@@ -6,7 +6,7 @@
               android:gravity="center"
               android:orientation="horizontal">
 
-    <androidx.cardview.widget.CardView
+    <android.support.v7.widget.CardView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_gravity="center"
@@ -42,6 +42,6 @@
                 android:fontFamily="sans-serif-condensed"
                 />
         </LinearLayout>
-    </androidx.cardview.widget.CardView>
+    </android.support.v7.widget.CardView>
 </LinearLayout>
 
diff --git a/app/src/main/res/layout/item_header_and_footer.xml b/app/src/main/res/layout/item_header_and_footer.xml
index 953e276a5..c47aa912b 100644
--- a/app/src/main/res/layout/item_header_and_footer.xml
+++ b/app/src/main/res/layout/item_header_and_footer.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     android:id="@+id/card_view"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
@@ -26,5 +26,5 @@
         android:src="@mipmap/headerandfooter_img1"/>
     </LinearLayout>
 
-</androidx.cardview.widget.CardView>
+</android.support.v7.widget.CardView>
 
diff --git a/app/src/main/res/layout/item_image_view.xml b/app/src/main/res/layout/item_image_view.xml
index 96989bae3..13a6f136e 100644
--- a/app/src/main/res/layout/item_image_view.xml
+++ b/app/src/main/res/layout/item_image_view.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
     android:id="@+id/card_view"
@@ -20,4 +20,4 @@
         android:layout_width="90dp"
         android:layout_height="90dp"
         android:src="@mipmap/click_head_img_0"/>
-</androidx.cardview.widget.CardView>
\ No newline at end of file
+</android.support.v7.widget.CardView>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_img_text_view.xml b/app/src/main/res/layout/item_img_text_view.xml
index ecb16ada3..07b69c94a 100644
--- a/app/src/main/res/layout/item_img_text_view.xml
+++ b/app/src/main/res/layout/item_img_text_view.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     android:id="@+id/card_view"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
@@ -40,4 +40,4 @@
             />
 
     </LinearLayout>
-</androidx.cardview.widget.CardView>
\ No newline at end of file
+</android.support.v7.widget.CardView>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_movie.xml b/app/src/main/res/layout/item_movie.xml
index c4b604452..1fdc07f3c 100644
--- a/app/src/main/res/layout/item_movie.xml
+++ b/app/src/main/res/layout/item_movie.xml
@@ -13,7 +13,7 @@
             type="com.chad.baserecyclerviewadapterhelper.entity.MoviePresenter"/>
     </data>
 
-    <androidx.cardview.widget.CardView xmlns:app="http://schemas.android.com/apk/res-auto"
+    <android.support.v7.widget.CardView xmlns:app="http://schemas.android.com/apk/res-auto"
                                         android:layout_width="match_parent"
                                         android:layout_height="175dp"
                                         app:cardBackgroundColor="@android:color/white"
@@ -26,7 +26,7 @@
             android:layout_height="match_parent">
 
 
-            <com.google.android.material.floatingactionbutton.FloatingActionButton
+            <android.support.design.widget.FloatingActionButton
                 android:id="@+id/button"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
@@ -108,5 +108,5 @@
             </RelativeLayout>
 
         </RelativeLayout>
-    </androidx.cardview.widget.CardView>
+    </android.support.v7.widget.CardView>
 </layout>
diff --git a/app/src/main/res/layout/item_nest_click.xml b/app/src/main/res/layout/item_nest_click.xml
index 6a5159ba4..d114dd1bd 100644
--- a/app/src/main/res/layout/item_nest_click.xml
+++ b/app/src/main/res/layout/item_nest_click.xml
@@ -7,7 +7,7 @@
     android:layout_height="wrap_content"
     android:background="@color/bg"
    >
-    <androidx.recyclerview.widget.RecyclerView
+    <android.support.v7.widget.RecyclerView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:id="@+id/nest_list"/>
diff --git a/app/src/main/res/layout/item_section_content.xml b/app/src/main/res/layout/item_section_content.xml
index 5734cb29a..4d072f82d 100644
--- a/app/src/main/res/layout/item_section_content.xml
+++ b/app/src/main/res/layout/item_section_content.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     android:id="@+id/card_view"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
@@ -33,4 +33,4 @@
         android:textStyle="bold"
         android:text="C"/>
 </LinearLayout>
-</androidx.cardview.widget.CardView>
\ No newline at end of file
+</android.support.v7.widget.CardView>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_text_view.xml b/app/src/main/res/layout/item_text_view.xml
index 0aa9a53c6..ff68f4738 100644
--- a/app/src/main/res/layout/item_text_view.xml
+++ b/app/src/main/res/layout/item_text_view.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     android:id="@+id/card_view"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
@@ -40,4 +40,4 @@
             android:text="If you would hit the mark, you must aim a little above it. Every arrow that flies feels the attraction of earth. －Henry Wadsworth Longfellow."
             />
     </LinearLayout>
-</androidx.cardview.widget.CardView>
\ No newline at end of file
+</android.support.v7.widget.CardView>
\ No newline at end of file
diff --git a/app/src/main/res/layout/layout_animation.xml b/app/src/main/res/layout/layout_animation.xml
index 0cdf26db1..d6dab42f9 100755
--- a/app/src/main/res/layout/layout_animation.xml
+++ b/app/src/main/res/layout/layout_animation.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<android.support.v7.widget.CardView
     android:id="@+id/card_view"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
@@ -71,4 +71,4 @@
             android:layout_alignParentEnd="true"/>
 
     </RelativeLayout>
-</androidx.cardview.widget.CardView>
+</android.support.v7.widget.CardView>
diff --git a/app/src/main/res/layout/toolbar_layout.xml b/app/src/main/res/layout/toolbar_layout.xml
index 9b760d57b..bd657b040 100644
--- a/app/src/main/res/layout/toolbar_layout.xml
+++ b/app/src/main/res/layout/toolbar_layout.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.appcompat.widget.Toolbar android:id="@+id/toolbar"
+<android.support.v7.widget.Toolbar android:id="@+id/toolbar"
                                    xmlns:android="http://schemas.android.com/apk/res/android"
                                    xmlns:app="http://schemas.android.com/apk/res-auto"
                                    android:layout_width="match_parent"
@@ -10,4 +10,4 @@
                                    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
 
     <include layout="@layout/layout_title_bar"/>
-</androidx.appcompat.widget.Toolbar>
+</android.support.v7.widget.Toolbar>
diff --git a/build.gradle b/build.gradle
index 86adc6f82..2d4a79afe 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,6 +4,7 @@ buildscript {
         jcenter()
         mavenLocal()
         mavenCentral()
+
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.1'
diff --git a/gradle.properties b/gradle.properties
index 028ef0806..780b865cd 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -19,5 +19,3 @@
 android.enableBuildCache=true
 android.enableD8=true
 android.buildCacheDir=./build/buildCache/
-android.useAndroidX=true
-android.enableJetifier=true
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 22780482a..e6b1884fa 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sat Jan 12 19:58:40 AWST 2019
+#Thu Mar 29 22:14:15 CST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
diff --git a/library/build.gradle b/library/build.gradle
index 5ec13a2b7..78add0500 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -3,7 +3,7 @@ android {
     compileSdkVersion 28
 
     defaultConfig {
-        minSdkVersion 11
+        minSdkVersion 14
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
@@ -48,5 +48,5 @@ artifacts {
 dependencies {
 
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    compileOnly 'androidx.recyclerview:recyclerview:1.0.0'
+    compileOnly 'com.android.support:recyclerview-v7:28.0.0'
 }
diff --git a/library/src/main/java/com/chad/library/adapter/base/BaseItemDraggableAdapter.java b/library/src/main/java/com/chad/library/adapter/base/BaseItemDraggableAdapter.java
index 1813ff84c..b5cd5d742 100644
--- a/library/src/main/java/com/chad/library/adapter/base/BaseItemDraggableAdapter.java
+++ b/library/src/main/java/com/chad/library/adapter/base/BaseItemDraggableAdapter.java
@@ -1,10 +1,10 @@
 package com.chad.library.adapter.base;
 
 import android.graphics.Canvas;
-import androidx.annotation.NonNull;
-import androidx.core.view.MotionEventCompat;
-import androidx.recyclerview.widget.RecyclerView;
-import androidx.recyclerview.widget.ItemTouchHelper;
+import android.support.annotation.NonNull;
+import android.support.v4.view.MotionEventCompat;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
 import android.view.MotionEvent;
 import android.view.View;
 
diff --git a/library/src/main/java/com/chad/library/adapter/base/BaseMultiItemQuickAdapter.java b/library/src/main/java/com/chad/library/adapter/base/BaseMultiItemQuickAdapter.java
index 1a62968b9..d463452d0 100644
--- a/library/src/main/java/com/chad/library/adapter/base/BaseMultiItemQuickAdapter.java
+++ b/library/src/main/java/com/chad/library/adapter/base/BaseMultiItemQuickAdapter.java
@@ -1,8 +1,7 @@
 package com.chad.library.adapter.base;
 
-import androidx.annotation.IntRange;
-import androidx.annotation.LayoutRes;
-
+import android.support.annotation.IntRange;
+import android.support.annotation.LayoutRes;
 import android.util.SparseIntArray;
 import android.view.ViewGroup;
 import com.chad.library.adapter.base.entity.IExpandable;
diff --git a/library/src/main/java/com/chad/library/adapter/base/BaseQuickAdapter.java b/library/src/main/java/com/chad/library/adapter/base/BaseQuickAdapter.java
index a2cb31575..3a8ee9c7c 100755
--- a/library/src/main/java/com/chad/library/adapter/base/BaseQuickAdapter.java
+++ b/library/src/main/java/com/chad/library/adapter/base/BaseQuickAdapter.java
@@ -20,17 +20,17 @@
 
 import android.animation.Animator;
 import android.content.Context;
-import androidx.annotation.IdRes;
-import androidx.annotation.IntDef;
-import androidx.annotation.IntRange;
-import androidx.annotation.LayoutRes;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
-import androidx.recyclerview.widget.RecyclerView.LayoutParams;
-import androidx.recyclerview.widget.StaggeredGridLayoutManager;
+import android.support.annotation.IdRes;
+import android.support.annotation.IntDef;
+import android.support.annotation.IntRange;
+import android.support.annotation.LayoutRes;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView.LayoutParams;
+import android.support.v7.widget.StaggeredGridLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/library/src/main/java/com/chad/library/adapter/base/BaseSectionMultiItemQuickAdapter.java b/library/src/main/java/com/chad/library/adapter/base/BaseSectionMultiItemQuickAdapter.java
index f96fc8a29..858baa08c 100644
--- a/library/src/main/java/com/chad/library/adapter/base/BaseSectionMultiItemQuickAdapter.java
+++ b/library/src/main/java/com/chad/library/adapter/base/BaseSectionMultiItemQuickAdapter.java
@@ -1,7 +1,7 @@
 package com.chad.library.adapter.base;
 
-import androidx.annotation.IntRange;
-import androidx.annotation.LayoutRes;
+import android.support.annotation.IntRange;
+import android.support.annotation.LayoutRes;
 import android.util.SparseIntArray;
 import android.view.ViewGroup;
 
diff --git a/library/src/main/java/com/chad/library/adapter/base/BaseViewHolder.java b/library/src/main/java/com/chad/library/adapter/base/BaseViewHolder.java
index 01b89f57f..19694df52 100755
--- a/library/src/main/java/com/chad/library/adapter/base/BaseViewHolder.java
+++ b/library/src/main/java/com/chad/library/adapter/base/BaseViewHolder.java
@@ -20,11 +20,11 @@
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
-import androidx.annotation.ColorInt;
-import androidx.annotation.DrawableRes;
-import androidx.annotation.IdRes;
-import androidx.annotation.StringRes;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.annotation.ColorInt;
+import android.support.annotation.DrawableRes;
+import android.support.annotation.IdRes;
+import android.support.annotation.StringRes;
+import android.support.v7.widget.RecyclerView;
 import android.text.util.Linkify;
 import android.util.SparseArray;
 import android.view.View;
diff --git a/library/src/main/java/com/chad/library/adapter/base/MultipleItemRvAdapter.java b/library/src/main/java/com/chad/library/adapter/base/MultipleItemRvAdapter.java
index 0df4a1187..5fc69f54c 100644
--- a/library/src/main/java/com/chad/library/adapter/base/MultipleItemRvAdapter.java
+++ b/library/src/main/java/com/chad/library/adapter/base/MultipleItemRvAdapter.java
@@ -1,6 +1,6 @@
 package com.chad.library.adapter.base;
 
-import androidx.annotation.Nullable;
+import android.support.annotation.Nullable;
 import android.util.SparseArray;
 import android.view.View;
 
diff --git a/library/src/main/java/com/chad/library/adapter/base/callback/ItemDragAndSwipeCallback.java b/library/src/main/java/com/chad/library/adapter/base/callback/ItemDragAndSwipeCallback.java
index c89b496f4..a4f8974a7 100644
--- a/library/src/main/java/com/chad/library/adapter/base/callback/ItemDragAndSwipeCallback.java
+++ b/library/src/main/java/com/chad/library/adapter/base/callback/ItemDragAndSwipeCallback.java
@@ -1,8 +1,8 @@
 package com.chad.library.adapter.base.callback;
 
 import android.graphics.Canvas;
-import androidx.recyclerview.widget.RecyclerView;
-import androidx.recyclerview.widget.ItemTouchHelper;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
 import android.view.View;
 
 import com.chad.library.R;
diff --git a/library/src/main/java/com/chad/library/adapter/base/listener/OnItemDragListener.java b/library/src/main/java/com/chad/library/adapter/base/listener/OnItemDragListener.java
index 490868662..5c3cbe18a 100644
--- a/library/src/main/java/com/chad/library/adapter/base/listener/OnItemDragListener.java
+++ b/library/src/main/java/com/chad/library/adapter/base/listener/OnItemDragListener.java
@@ -1,6 +1,6 @@
 package com.chad.library.adapter.base.listener;
 
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView;
 
 /**
  * Created by luoxw on 2016/6/20.
diff --git a/library/src/main/java/com/chad/library/adapter/base/listener/OnItemSwipeListener.java b/library/src/main/java/com/chad/library/adapter/base/listener/OnItemSwipeListener.java
index 8eee3d376..9227a2c8c 100644
--- a/library/src/main/java/com/chad/library/adapter/base/listener/OnItemSwipeListener.java
+++ b/library/src/main/java/com/chad/library/adapter/base/listener/OnItemSwipeListener.java
@@ -1,7 +1,7 @@
 package com.chad.library.adapter.base.listener;
 
 import android.graphics.Canvas;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView;
 
 /**
  * Created by luoxw on 2016/6/23.
diff --git a/library/src/main/java/com/chad/library/adapter/base/listener/SimpleClickListener.java b/library/src/main/java/com/chad/library/adapter/base/listener/SimpleClickListener.java
index ced038c47..0ad31c3ed 100644
--- a/library/src/main/java/com/chad/library/adapter/base/listener/SimpleClickListener.java
+++ b/library/src/main/java/com/chad/library/adapter/base/listener/SimpleClickListener.java
@@ -1,8 +1,8 @@
 package com.chad.library.adapter.base.listener;
 
 import android.os.Build;
-import androidx.core.view.GestureDetectorCompat;
-import androidx.recyclerview.widget.RecyclerView;
+import android.support.v4.view.GestureDetectorCompat;
+import android.support.v7.widget.RecyclerView;
 import android.view.GestureDetector;
 import android.view.HapticFeedbackConstants;
 import android.view.MotionEvent;
diff --git a/library/src/main/java/com/chad/library/adapter/base/loadmore/LoadMoreView.java b/library/src/main/java/com/chad/library/adapter/base/loadmore/LoadMoreView.java
index dd764d250..1cd65d847 100644
--- a/library/src/main/java/com/chad/library/adapter/base/loadmore/LoadMoreView.java
+++ b/library/src/main/java/com/chad/library/adapter/base/loadmore/LoadMoreView.java
@@ -1,7 +1,7 @@
 package com.chad.library.adapter.base.loadmore;
 
-import androidx.annotation.IdRes;
-import androidx.annotation.LayoutRes;
+import android.support.annotation.IdRes;
+import android.support.annotation.LayoutRes;
 
 import com.chad.library.adapter.base.BaseQuickAdapter;
 import com.chad.library.adapter.base.BaseViewHolder;
diff --git a/library/src/main/java/com/chad/library/adapter/base/util/MultiTypeDelegate.java b/library/src/main/java/com/chad/library/adapter/base/util/MultiTypeDelegate.java
index 53e5114de..1babeacfe 100644
--- a/library/src/main/java/com/chad/library/adapter/base/util/MultiTypeDelegate.java
+++ b/library/src/main/java/com/chad/library/adapter/base/util/MultiTypeDelegate.java
@@ -1,6 +1,6 @@
 package com.chad.library.adapter.base.util;
 
-import androidx.annotation.LayoutRes;
+import android.support.annotation.LayoutRes;
 import android.util.SparseIntArray;
 
 import java.util.List;