diff --git a/app/src/main/java/io/legado/app/ui/widget/dynamiclayout/DynamicFrameLayout.kt b/app/src/main/java/io/legado/app/ui/widget/dynamiclayout/DynamicFrameLayout.kt
index 99e0cd702..683cbc5d9 100644
--- a/app/src/main/java/io/legado/app/ui/widget/dynamiclayout/DynamicFrameLayout.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/dynamiclayout/DynamicFrameLayout.kt
@@ -12,6 +12,7 @@ import androidx.appcompat.widget.AppCompatTextView
 import io.legado.app.R
 import kotlinx.android.synthetic.main.view_dynamic.view.*
 
+@Suppress("unused")
 class DynamicFrameLayout(context: Context, attrs: AttributeSet?) : FrameLayout(context, attrs), ViewSwitcher {
 
     private var errorView: View? = null
diff --git a/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt b/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt
index 3b4c8f5db..91dd8ffa3 100644
--- a/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt
@@ -48,7 +48,7 @@ class NumberPickerDialog(context: Context) {
                 listener?.invoke()
             }
         }
-        return this;
+        return this
     }
 
     fun show(callBack: ((value: Int) -> Unit)?) {
diff --git a/app/src/main/java/io/legado/app/ui/widget/prefs/ColorPreference.kt b/app/src/main/java/io/legado/app/ui/widget/prefs/ColorPreference.kt
index 8f293eebb..468f4ce71 100644
--- a/app/src/main/java/io/legado/app/ui/widget/prefs/ColorPreference.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/prefs/ColorPreference.kt
@@ -16,6 +16,7 @@ import com.jaredrummler.android.colorpicker.*
 import io.legado.app.lib.theme.ATH
 import io.legado.app.utils.ColorUtils
 
+@Suppress("MemberVisibilityCanBePrivate", "unused")
 class ColorPreference(context: Context, attrs: AttributeSet) : Preference(context, attrs),
     ColorPickerDialogListener {
 
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/DividerNoLast.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/DividerNoLast.kt
index 5c9e38e4d..92ac1a672 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/DividerNoLast.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/DividerNoLast.kt
@@ -14,6 +14,7 @@ import kotlin.math.roundToInt
 /**
  * 不画最后一条分隔线
  */
+@Suppress("MemberVisibilityCanBePrivate", "RedundantRequireNotNullCall", "unused")
 class DividerNoLast(context: Context, orientation: Int) :
     RecyclerView.ItemDecoration() {
 
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/DragSelectTouchHelper.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/DragSelectTouchHelper.kt
index 015595ec1..baa4645bb 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/DragSelectTouchHelper.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/DragSelectTouchHelper.kt
@@ -51,7 +51,7 @@ import kotlin.math.min
  *  |                   | ----------------------------------------------> |                       |
  *  +-------------------+                                                 +-----------------------+
  */
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 class DragSelectTouchHelper(
     /**
      * Developer callback which controls the behavior of DragSelectTouchHelper.
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/ItemTouchCallback.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/ItemTouchCallback.kt
index a68ac72f4..368fd8c36 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/ItemTouchCallback.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/ItemTouchCallback.kt
@@ -12,6 +12,7 @@ import androidx.viewpager.widget.ViewPager
  * Created by GKF on 2018/3/16.
  */
 
+@Suppress("MemberVisibilityCanBePrivate")
 class ItemTouchCallback(private val callback: Callback) : ItemTouchHelper.Callback() {
 
     private var swipeRefreshLayout: SwipeRefreshLayout? = null
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/LoadMoreView.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/LoadMoreView.kt
index a2437c0b4..01cb906cb 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/LoadMoreView.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/LoadMoreView.kt
@@ -9,6 +9,7 @@ import io.legado.app.utils.invisible
 import io.legado.app.utils.visible
 import kotlinx.android.synthetic.main.view_load_more.view.*
 
+@Suppress("unused")
 class LoadMoreView(context: Context) : FrameLayout(context) {
 
     var hasMore = true
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/UpLinearLayoutManager.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/UpLinearLayoutManager.kt
index 0af559c45..1dfd9ec9a 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/UpLinearLayoutManager.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/UpLinearLayoutManager.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.LinearSmoothScroller
 
+@Suppress("MemberVisibilityCanBePrivate", "unused")
 class UpLinearLayoutManager(val context: Context) : LinearLayoutManager(context) {
 
     fun smoothScrollToPosition(position: Int) {
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScrollRecyclerView.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScrollRecyclerView.kt
index f080f5cba..35623f5e2 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScrollRecyclerView.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScrollRecyclerView.kt
@@ -7,6 +7,7 @@ import androidx.annotation.ColorInt
 import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
 
+@Suppress("MemberVisibilityCanBePrivate", "unused")
 class FastScrollRecyclerView : RecyclerView {
 
     private lateinit var mFastScroller: FastScroller
diff --git a/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt b/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt
index 7a66873d5..a8372689e 100644
--- a/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/recycler/scroller/FastScroller.kt
@@ -33,9 +33,11 @@ import kotlin.math.min
 import kotlin.math.roundToInt
 
 
+@Suppress("SameParameterValue")
 class FastScroller : LinearLayout {
     @ColorInt
     private var mBubbleColor: Int = 0
+
     @ColorInt
     private var mHandleColor: Int = 0
     private var mBubbleHeight: Int = 0
diff --git a/app/src/main/java/io/legado/app/ui/widget/seekbar/VerticalSeekBar.kt b/app/src/main/java/io/legado/app/ui/widget/seekbar/VerticalSeekBar.kt
index f08e2b3c6..ab4509954 100644
--- a/app/src/main/java/io/legado/app/ui/widget/seekbar/VerticalSeekBar.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/seekbar/VerticalSeekBar.kt
@@ -16,6 +16,7 @@ import io.legado.app.lib.theme.ThemeStore
 import java.lang.reflect.InvocationTargetException
 import java.lang.reflect.Method
 
+@Suppress("SameParameterValue")
 class VerticalSeekBar : AppCompatSeekBar {
 
     private var mIsDragging: Boolean = false
diff --git a/app/src/main/java/io/legado/app/utils/FloatExtensions.kt b/app/src/main/java/io/legado/app/utils/FloatExtensions.kt
index 4e3c7f9ed..ab5178cd6 100644
--- a/app/src/main/java/io/legado/app/utils/FloatExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/FloatExtensions.kt
@@ -1,3 +1,5 @@
+@file:Suppress("unused")
+
 package io.legado.app.utils
 
 import android.content.res.Resources
@@ -7,7 +9,6 @@ val Float.dp: Float
         android.util.TypedValue.COMPLEX_UNIT_DIP, this, Resources.getSystem().displayMetrics
     )
 
-
 val Float.sp: Float
     get() = android.util.TypedValue.applyDimension(
         android.util.TypedValue.COMPLEX_UNIT_SP, this, Resources.getSystem().displayMetrics
diff --git a/app/src/main/java/io/legado/app/utils/NetworkUtils.kt b/app/src/main/java/io/legado/app/utils/NetworkUtils.kt
index 4a3e236cb..40ec8edc6 100644
--- a/app/src/main/java/io/legado/app/utils/NetworkUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/NetworkUtils.kt
@@ -8,7 +8,7 @@ import java.net.URL
 import java.util.*
 import java.util.regex.Pattern
 
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 object NetworkUtils {
     fun getUrl(response: Response<*>): String {
         val networkResponse = response.raw().networkResponse()