diff --git a/app/src/main/java/io/legado/app/ui/widget/LabelsBar.kt b/app/src/main/java/io/legado/app/ui/widget/LabelsBar.kt
index a2f354772..4d51c5b80 100644
--- a/app/src/main/java/io/legado/app/ui/widget/LabelsBar.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/LabelsBar.kt
@@ -7,7 +7,7 @@ import android.widget.TextView
 import io.legado.app.ui.widget.text.AccentBgTextView
 import io.legado.app.utils.dp
 
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 class LabelsBar(context: Context, attrs: AttributeSet?) : LinearLayout(context, attrs) {
 
     private val unUsedViews = arrayListOf<TextView>()
diff --git a/app/src/main/java/io/legado/app/ui/widget/SearchView.kt b/app/src/main/java/io/legado/app/ui/widget/SearchView.kt
index 6d340c6d7..2f83c8594 100644
--- a/app/src/main/java/io/legado/app/ui/widget/SearchView.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/SearchView.kt
@@ -1,5 +1,6 @@
 package io.legado.app.ui.widget
 
+import android.annotation.SuppressLint
 import android.app.SearchableInfo
 import android.content.Context
 import android.graphics.Canvas
@@ -30,6 +31,7 @@ class SearchView : SearchView {
         defStyleAttr: Int
     ) : super(context, attrs, defStyleAttr)
 
+    @SuppressLint("UseCompatLoadingForDrawables")
     override fun onLayout(
         changed: Boolean,
         left: Int,
diff --git a/app/src/main/java/io/legado/app/ui/widget/SelectActionBar.kt b/app/src/main/java/io/legado/app/ui/widget/SelectActionBar.kt
index 7cba90778..fd478ae42 100644
--- a/app/src/main/java/io/legado/app/ui/widget/SelectActionBar.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/SelectActionBar.kt
@@ -16,6 +16,7 @@ import io.legado.app.utils.visible
 import kotlinx.android.synthetic.main.view_select_action_bar.view.*
 import org.jetbrains.anko.sdk27.listeners.onClick
 
+@Suppress("unused")
 class SelectActionBar(context: Context, attrs: AttributeSet?) : FrameLayout(context, attrs) {
     private var callBack: CallBack? = null
     private var selMenu: PopupMenu? = null
diff --git a/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt b/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt
index 0f6ad3200..76668e772 100644
--- a/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt
@@ -17,6 +17,7 @@ import io.legado.app.utils.getCompatColor
  *
  * Created by lijiankun on 17/8/11.
  */
+@Suppress("unused")
 class ShadowLayout(
     context: Context,
     attrs: AttributeSet? = null
diff --git a/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt b/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt
index 2143b4e48..a30873671 100644
--- a/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/TitleBar.kt
@@ -21,6 +21,7 @@ import org.jetbrains.anko.backgroundColor
 import org.jetbrains.anko.bottomPadding
 import org.jetbrains.anko.topPadding
 
+@Suppress("unused")
 class TitleBar(context: Context, attrs: AttributeSet?) : AppBarLayout(context, attrs) {
 
     val toolbar: Toolbar
diff --git a/app/src/main/java/io/legado/app/ui/widget/anima/RefreshProgressBar.kt b/app/src/main/java/io/legado/app/ui/widget/anima/RefreshProgressBar.kt
index df123bfcd..1791b3be7 100644
--- a/app/src/main/java/io/legado/app/ui/widget/anima/RefreshProgressBar.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/anima/RefreshProgressBar.kt
@@ -11,6 +11,7 @@ import android.view.View
 
 import io.legado.app.R
 
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 class RefreshProgressBar @JvmOverloads constructor(
     context: Context,
     attrs: AttributeSet? = null,
diff --git a/app/src/main/java/io/legado/app/ui/widget/anima/RotateLoading.kt b/app/src/main/java/io/legado/app/ui/widget/anima/RotateLoading.kt
index 7a5e436c3..13c4f346d 100644
--- a/app/src/main/java/io/legado/app/ui/widget/anima/RotateLoading.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/anima/RotateLoading.kt
@@ -17,6 +17,7 @@ import io.legado.app.utils.dp
  * RotateLoading
  * Created by Victor on 2015/4/28.
  */
+@Suppress("MemberVisibilityCanBePrivate")
 class RotateLoading : View {
 
     private lateinit var mPaint: Paint
diff --git a/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionAnimator.kt b/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionAnimator.kt
index 9b80b1825..6542ea55f 100644
--- a/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionAnimator.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionAnimator.kt
@@ -20,6 +20,7 @@ import android.graphics.*
 import android.view.View
 import android.view.animation.AccelerateInterpolator
 import java.util.*
+import kotlin.math.pow
 
 class ExplosionAnimator(private val mContainer: View, bitmap: Bitmap, bound: Rect) :
     ValueAnimator() {
@@ -99,20 +100,20 @@ class ExplosionAnimator(private val mContainer: View, bitmap: Bitmap, bound: Rec
     }
 
     private inner class Particle {
-        internal var alpha: Float = 0.toFloat()
-        internal var color: Int = 0
-        internal var cx: Float = 0.toFloat()
-        internal var cy: Float = 0.toFloat()
-        internal var radius: Float = 0.toFloat()
-        internal var baseCx: Float = 0.toFloat()
-        internal var baseCy: Float = 0.toFloat()
-        internal var baseRadius: Float = 0.toFloat()
-        internal var top: Float = 0.toFloat()
-        internal var bottom: Float = 0.toFloat()
-        internal var mag: Float = 0.toFloat()
-        internal var neg: Float = 0.toFloat()
-        internal var life: Float = 0.toFloat()
-        internal var overflow: Float = 0.toFloat()
+        var alpha: Float = 0.toFloat()
+        var color: Int = 0
+        var cx: Float = 0.toFloat()
+        var cy: Float = 0.toFloat()
+        var radius: Float = 0.toFloat()
+        var baseCx: Float = 0.toFloat()
+        var baseCy: Float = 0.toFloat()
+        var baseRadius: Float = 0.toFloat()
+        var top: Float = 0.toFloat()
+        var bottom: Float = 0.toFloat()
+        var mag: Float = 0.toFloat()
+        var neg: Float = 0.toFloat()
+        var life: Float = 0.toFloat()
+        var overflow: Float = 0.toFloat()
 
 
         fun advance(factor: Float) {
@@ -130,7 +131,7 @@ class ExplosionAnimator(private val mContainer: View, bitmap: Bitmap, bound: Rec
             alpha = 1f - f
             f = bottom * f2
             cx = baseCx + f
-            cy = (baseCy - this.neg * Math.pow(f.toDouble(), 2.0)).toFloat() - f * mag
+            cy = (baseCy - this.neg * f.toDouble().pow(2.0)).toFloat() - f * mag
             radius = V + (baseRadius - V) * f2
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionView.kt b/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionView.kt
index c79695a51..9eef530f2 100644
--- a/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionView.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/anima/explosion_field/ExplosionView.kt
@@ -29,6 +29,7 @@ import android.view.View
 import java.util.*
 
 
+@Suppress("unused")
 class ExplosionView : View {
 
     private var customDuration = ExplosionAnimator.DEFAULT_DURATION
@@ -75,8 +76,8 @@ class ExplosionView : View {
         this.customDuration = customDuration
     }
 
-    fun addActionEvent(ievents: OnAnimatorListener) {
-        this.mZAnimatorListener = ievents
+    fun addActionEvent(iEvents: OnAnimatorListener) {
+        this.mZAnimatorListener = iEvents
     }
 
 
diff --git a/app/src/main/java/io/legado/app/ui/widget/image/CircleImageView.kt b/app/src/main/java/io/legado/app/ui/widget/image/CircleImageView.kt
index 43e3f5506..b1d1a5376 100644
--- a/app/src/main/java/io/legado/app/ui/widget/image/CircleImageView.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/image/CircleImageView.kt
@@ -24,6 +24,7 @@ import io.legado.app.utils.sp
 import kotlin.math.min
 import kotlin.math.pow
 
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 class CircleImageView(context: Context, attrs: AttributeSet) :
     AppCompatImageView(
         context,
diff --git a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
index 7786bfed4..6be7ea2c3 100644
--- a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
@@ -16,7 +16,7 @@ import java.io.IOException
 import kotlin.math.*
 
 
-@Suppress("unused", "WeakerAccess")
+@Suppress("unused", "WeakerAccess", "MemberVisibilityCanBePrivate")
 object BitmapUtils {
 
     /**
diff --git a/app/src/main/java/io/legado/app/utils/ColorUtils.kt b/app/src/main/java/io/legado/app/utils/ColorUtils.kt
index 8a9a35052..800cd3c8b 100644
--- a/app/src/main/java/io/legado/app/utils/ColorUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/ColorUtils.kt
@@ -7,7 +7,7 @@ import androidx.annotation.FloatRange
 import java.util.*
 import kotlin.math.*
 
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 object ColorUtils {
 
     fun intToString(intColor: Int): String {
diff --git a/app/src/main/java/io/legado/app/utils/ConstraintUtil.kt b/app/src/main/java/io/legado/app/utils/ConstraintUtil.kt
index b7ef740cc..bb2cc7bad 100644
--- a/app/src/main/java/io/legado/app/utils/ConstraintUtil.kt
+++ b/app/src/main/java/io/legado/app/utils/ConstraintUtil.kt
@@ -6,6 +6,7 @@ import androidx.constraintlayout.widget.ConstraintSet
 import androidx.transition.TransitionManager
 
 
+@Suppress("MemberVisibilityCanBePrivate", "unused")
 class ConstraintUtil(private val constraintLayout: ConstraintLayout) {
 
     private var begin: ConstraintBegin? = null
@@ -55,6 +56,7 @@ class ConstraintUtil(private val constraintLayout: ConstraintLayout) {
 
 }
 
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 class ConstraintBegin(
     private val constraintLayout: ConstraintLayout,
     private val applyConstraintSet: ConstraintSet
diff --git a/app/src/main/java/io/legado/app/utils/DocumentUtils.kt b/app/src/main/java/io/legado/app/utils/DocumentUtils.kt
index 041189c7f..64bc9e233 100644
--- a/app/src/main/java/io/legado/app/utils/DocumentUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/DocumentUtils.kt
@@ -8,6 +8,7 @@ import androidx.documentfile.provider.DocumentFile
 import java.util.*
 
 
+@Suppress("MemberVisibilityCanBePrivate")
 object DocumentUtils {
 
     fun exists(root: DocumentFile, fileName: String, vararg subDirs: String): Boolean {
diff --git a/app/src/main/java/io/legado/app/utils/EventBusExtensions.kt b/app/src/main/java/io/legado/app/utils/EventBusExtensions.kt
index 0d9473a3c..c0aedf8b3 100644
--- a/app/src/main/java/io/legado/app/utils/EventBusExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/EventBusExtensions.kt
@@ -1,3 +1,5 @@
+@file:Suppress("unused")
+
 package io.legado.app.utils
 
 import androidx.appcompat.app.AppCompatActivity
diff --git a/app/src/main/java/io/legado/app/utils/FileUtils.kt b/app/src/main/java/io/legado/app/utils/FileUtils.kt
index ef67fab8b..ecb22f244 100644
--- a/app/src/main/java/io/legado/app/utils/FileUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/FileUtils.kt
@@ -11,7 +11,7 @@ import java.text.SimpleDateFormat
 import java.util.*
 import java.util.regex.Pattern
 
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 object FileUtils {
 
     fun exists(root: File, vararg subDirFiles: String): Boolean {
@@ -489,11 +489,10 @@ object FileUtils {
      */
     @JvmOverloads
     fun writeText(filepath: String, content: String, charset: String = "utf-8"): Boolean {
-        try {
+        return try {
             writeBytes(filepath, content.toByteArray(charset(charset)))
-            return true
         } catch (e: UnsupportedEncodingException) {
-            return false
+            false
         }
 
     }
@@ -569,15 +568,15 @@ object FileUtils {
      * 获取文件名（不包括扩展名）
      */
     fun getNameExcludeExtension(path: String): String {
-        try {
+        return try {
             var fileName = File(path).name
             val lastIndexOf = fileName.lastIndexOf(".")
             if (lastIndexOf != -1) {
                 fileName = fileName.substring(0, lastIndexOf)
             }
-            return fileName
+            fileName
         } catch (e: Exception) {
-            return ""
+            ""
         }
 
     }
diff --git a/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt b/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt
index de7f10b96..2e812a241 100644
--- a/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt
@@ -1,3 +1,5 @@
+@file:Suppress("unused")
+
 package io.legado.app.utils
 
 import android.app.Activity
@@ -14,7 +16,8 @@ import org.jetbrains.anko.defaultSharedPreferences
 import org.jetbrains.anko.internals.AnkoInternals
 
 @Suppress("DEPRECATION")
-fun Fragment.isOnline() = requireContext().connectivityManager.activeNetworkInfo?.isConnected == true
+fun Fragment.isOnline() =
+    requireContext().connectivityManager.activeNetworkInfo?.isConnected == true
 
 fun Fragment.getPrefBoolean(key: String, defValue: Boolean = false) =
     requireContext().defaultSharedPreferences.getBoolean(key, defValue)
@@ -40,7 +43,10 @@ fun Fragment.getPrefString(key: String, defValue: String? = null) =
 fun Fragment.putPrefString(key: String, value: String) =
     requireContext().defaultSharedPreferences.edit { putString(key, value) }
 
-fun Fragment.getPrefStringSet(key: String, defValue: MutableSet<String>? = null) =
+fun Fragment.getPrefStringSet(
+    key: String,
+    defValue: MutableSet<String>? = null
+): MutableSet<String>? =
     requireContext().defaultSharedPreferences.getStringSet(key, defValue)
 
 fun Fragment.putPrefStringSet(key: String, value: MutableSet<String>) =
@@ -51,15 +57,23 @@ fun Fragment.removePref(key: String) =
 
 fun Fragment.getCompatColor(@ColorRes id: Int): Int = requireContext().getCompatColor(id)
 
-fun Fragment.getCompatDrawable(@DrawableRes id: Int): Drawable? = requireContext().getCompatDrawable(id)
+fun Fragment.getCompatDrawable(@DrawableRes id: Int): Drawable? =
+    requireContext().getCompatDrawable(id)
 
-fun Fragment.getCompatColorStateList(@ColorRes id: Int): ColorStateList? = requireContext().getCompatColorStateList(id)
+fun Fragment.getCompatColorStateList(@ColorRes id: Int): ColorStateList? =
+    requireContext().getCompatColorStateList(id)
 
 inline fun <reified T : Activity> Fragment.startActivity(vararg params: Pair<String, Any?>) =
     AnkoInternals.internalStartActivity(requireActivity(), T::class.java, params)
 
-inline fun <reified T : Activity> Fragment.startActivityForResult(requestCode: Int, vararg params: Pair<String, Any?>) =
-    startActivityForResult(AnkoInternals.createIntent(requireActivity(), T::class.java, params), requestCode)
+inline fun <reified T : Activity> Fragment.startActivityForResult(
+    requestCode: Int,
+    vararg params: Pair<String, Any?>
+) =
+    startActivityForResult(
+        AnkoInternals.createIntent(requireActivity(), T::class.java, params),
+        requestCode
+    )
 
 inline fun <reified T : Service> Fragment.startService(vararg params: Pair<String, Any?>) =
     AnkoInternals.internalStartService(requireActivity(), T::class.java, params)
diff --git a/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt b/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt
index 3f347e4a1..2c9829ddd 100644
--- a/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/JsoupExtensions.kt
@@ -10,41 +10,38 @@ import org.jsoup.select.NodeVisitor
 
 
 fun Element.textArray(): Array<String> {
-    val accum = StringUtil.borrowBuilder()
+    val sb = StringUtil.borrowBuilder()
     NodeTraversor.traverse(object : NodeVisitor {
         override fun head(node: Node, depth: Int) {
             if (node is TextNode) {
-                appendNormalisedText(accum, node)
+                appendNormalisedText(sb, node)
             } else if (node is Element) {
-                if (accum.isNotEmpty() &&
+                if (sb.isNotEmpty() &&
                     (node.isBlock || node.tag().name == "br") &&
-                    !lastCharIsWhitespace(accum)
-                ) accum.append("\n")
+                    !lastCharIsWhitespace(sb)
+                ) sb.append("\n")
             }
         }
 
         override fun tail(node: Node, depth: Int) {
             if (node is Element) {
-                if (node.isBlock && node.nextSibling() is TextNode && !lastCharIsWhitespace(
-                        accum
-                    )
-                ) accum.append("\n")
+                if (node.isBlock && node.nextSibling() is TextNode
+                    && !lastCharIsWhitespace(sb)
+                ) {
+                    sb.append("\n")
+                }
             }
         }
     }, this)
-    val text = StringUtil.releaseBuilder(accum).trim { it <= ' ' }
+    val text = StringUtil.releaseBuilder(sb).trim { it <= ' ' }
     return text.splitNotBlank("\n")
 }
 
-private fun appendNormalisedText(accum: StringBuilder, textNode: TextNode) {
+private fun appendNormalisedText(sb: StringBuilder, textNode: TextNode) {
     val text = textNode.wholeText
     if (preserveWhitespace(textNode.parentNode()) || textNode is CDataNode)
-        accum.append(text)
-    else StringUtil.appendNormalisedWhitespace(
-        accum,
-        text,
-        lastCharIsWhitespace(accum)
-    )
+        sb.append(text)
+    else StringUtil.appendNormalisedWhitespace(sb, text, lastCharIsWhitespace(sb))
 }
 
 private fun preserveWhitespace(node: Node?): Boolean {
diff --git a/app/src/main/java/io/legado/app/utils/LanguageUtils.kt b/app/src/main/java/io/legado/app/utils/LanguageUtils.kt
index def23e1e8..7a8572ded 100644
--- a/app/src/main/java/io/legado/app/utils/LanguageUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/LanguageUtils.kt
@@ -72,14 +72,6 @@ object LanguageUtils {
             @Suppress("DEPRECATION")
             locale = context.resources.configuration.locale
         }
-        /*
-        Log.d("h11128", "displayName " + locale.displayName)
-        Log.d("h11128", "displayCountry " + locale.displayCountry)
-        Log.d("h11128", "displayLanguage " + locale.displayLanguage)
-        Log.d("h11128", "Language " + locale.language)
-        Log.d("h11128", "Country " + locale.country)
-
-         */
         return locale
 
     }
diff --git a/app/src/main/java/io/legado/app/utils/StringUtils.kt b/app/src/main/java/io/legado/app/utils/StringUtils.kt
index 4ee24ba2a..8ee17662d 100644
--- a/app/src/main/java/io/legado/app/utils/StringUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/StringUtils.kt
@@ -12,7 +12,7 @@ import kotlin.math.abs
 import kotlin.math.log10
 import kotlin.math.pow
 
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate")
 object StringUtils {
     private const val HOUR_OF_DAY = 24
     private const val DAY_OF_YESTERDAY = 2
diff --git a/app/src/main/java/io/legado/app/utils/ViewExtensions.kt b/app/src/main/java/io/legado/app/utils/ViewExtensions.kt
index 7ed6d8cd6..122f814a0 100644
--- a/app/src/main/java/io/legado/app/utils/ViewExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/ViewExtensions.kt
@@ -7,7 +7,6 @@ import android.graphics.Canvas
 import android.os.Build
 import android.view.View
 import android.view.View.*
-import android.view.ViewGroup
 import android.view.inputmethod.InputMethodManager
 import android.widget.RadioGroup
 import android.widget.SeekBar
@@ -80,13 +79,6 @@ fun View.screenshot(): Bitmap? {
     }.getOrNull()
 }
 
-fun View.setMargin(left: Int, top: Int, right: Int, bottom: Int) {
-    if (layoutParams is ViewGroup.MarginLayoutParams) {
-        (layoutParams as ViewGroup.MarginLayoutParams).setMargins(left, top, right, bottom)
-        requestLayout()
-    }
-}
-
 fun SeekBar.progressAdd(int: Int) {
     progress += int
 }