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 00f1d4c58..14212f442 100644
--- a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
@@ -147,7 +147,7 @@ object BitmapUtils {
 
     //图片不被压缩
     fun convertViewToBitmap(view: View, bitmapWidth: Int, bitmapHeight: Int): Bitmap {
-        val bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888)
+        val bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Config.ARGB_8888)
         view.draw(Canvas(bitmap))
         return bitmap
     }
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 3ca7ab5bc..9eceb6724 100644
--- a/app/src/main/java/io/legado/app/utils/ColorUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/ColorUtils.kt
@@ -4,6 +4,9 @@ import android.graphics.Color
 
 import androidx.annotation.ColorInt
 import androidx.annotation.FloatRange
+import kotlin.math.max
+import kotlin.math.min
+import kotlin.math.roundToInt
 
 @Suppress("unused")
 object ColorUtils {
@@ -53,7 +56,7 @@ object ColorUtils {
 
     @ColorInt
     fun adjustAlpha(@ColorInt color: Int, @FloatRange(from = 0.0, to = 1.0) factor: Float): Int {
-        val alpha = Math.round(Color.alpha(color) * factor)
+        val alpha = (Color.alpha(color) * factor).roundToInt()
         val red = Color.red(color)
         val green = Color.green(color)
         val blue = Color.blue(color)
@@ -62,7 +65,7 @@ object ColorUtils {
 
     @ColorInt
     fun withAlpha(@ColorInt baseColor: Int, @FloatRange(from = 0.0, to = 1.0) alpha: Float): Int {
-        val a = Math.min(255, Math.max(0, (alpha * 255).toInt())) shl 24
+        val a = min(255, max(0, (alpha * 255).toInt())) shl 24
         val rgb = 0x00ffffff and baseColor
         return a + rgb
     }
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 af9576c00..4e3c7f9ed 100644
--- a/app/src/main/java/io/legado/app/utils/FloatExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/FloatExtensions.kt
@@ -2,14 +2,13 @@ package io.legado.app.utils
 
 import android.content.res.Resources
 
-
-val Float.dp: Float                 // [xxhdpi](360 -> 1080)
+val Float.dp: Float
     get() = android.util.TypedValue.applyDimension(
         android.util.TypedValue.COMPLEX_UNIT_DIP, this, Resources.getSystem().displayMetrics
     )
 
 
-val Float.sp: Float                 // [xxhdpi](360 -> 1080)
+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/StringExtensions.kt b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
index 02faf53c3..63954162e 100644
--- a/app/src/main/java/io/legado/app/utils/StringExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
@@ -1,7 +1,5 @@
 package io.legado.app.utils
 
-// import org.apache.commons.text.StringEscapeUtils
-
 fun String?.safeTrim() = if (this.isNullOrBlank()) null else this.trim()
 
 fun String?.isContentPath(): Boolean = this?.startsWith("content://") == true