优化

app/src/main/java/io/legado/app/ui/widget/image/CircleImageView.kt

@@ -7,7 +7,6 @@ import android.graphics.drawable.BitmapDrawable
 import android.graphics.drawable.ColorDrawable
 import android.graphics.drawable.Drawable
 import android.net.Uri
-import android.os.Build
 import android.text.TextPaint
 import android.util.AttributeSet
 import android.view.MotionEvent
@@ -16,13 +15,11 @@ import android.view.ViewOutlineProvider
 import androidx.annotation.ColorInt
 import androidx.annotation.ColorRes
 import androidx.annotation.DrawableRes
-import androidx.annotation.RequiresApi
 import androidx.appcompat.widget.AppCompatImageView
 import io.legado.app.R
 import io.legado.app.utils.getCompatColor
 import io.legado.app.utils.printOnDebug
 import io.legado.app.utils.spToPx
-
 import kotlin.math.min
 import kotlin.math.pow
 
@@ -431,7 +428,6 @@ class CircleImageView @JvmOverloads constructor(
             .pow(2.0) <= mBorderRadius.toDouble().pow(2.0)
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
     private inner class OutlineProvider : ViewOutlineProvider() {
 
         override fun getOutline(view: View, outline: Outline) {

app/src/main/java/io/legado/app/ui/widget/image/ImageButton.kt

@@ -0,0 +1,20 @@
+package io.legado.app.ui.widget.image
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.appcompat.widget.AppCompatImageView
+
+class ImageButton @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null
+) : AppCompatImageView(context, attrs) {
+
+
+    override fun setEnabled(enabled: Boolean) {
+        if (isEnabled != enabled) {
+            imageAlpha = if (enabled) 0xFF else 0x3F
+        }
+        super.setEnabled(enabled)
+    }
+
+}

app/src/main/res/drawable/selector_circle_btn_bg.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true" android:drawable="@drawable/shape_circle" />
+</selector>

app/src/main/res/drawable/shape_circle.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+
+    <solid android:color="#60666666" />
+
+    <size
+        android:width="120dp"
+        android:height="120dp" />
+
+</shape>

app/src/main/res/layout/activity_audio_play.xml

@@ -123,15 +123,15 @@
         android:layout_height="wrap_content"
         android:gravity="center_vertical"
         android:orientation="horizontal"
-        android:paddingLeft="24dp"
-        android:paddingRight="24dp"
+        android:paddingHorizontal="6dp"
         app:layout_constraintBottom_toBottomOf="parent">
 
-        <ImageView
+        <io.legado.app.ui.widget.image.ImageButton
             android:id="@+id/iv_timer"
-            android:layout_width="36dp"
-            android:layout_height="36dp"
-            android:background="?attr/selectableItemBackgroundBorderless"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:padding="5dp"
+            android:background="@drawable/selector_circle_btn_bg"
             android:contentDescription="@string/set_timer"
             android:src="@drawable/ic_timer_black_24dp"
             app:tint="@color/md_white_1000"
@@ -142,11 +142,12 @@
             android:layout_height="1dp"
             android:layout_weight="1" />
 
-        <ImageView
+        <io.legado.app.ui.widget.image.ImageButton
             android:id="@+id/iv_fast_rewind"
-            android:layout_width="36dp"
-            android:layout_height="36dp"
-            android:background="?attr/selectableItemBackgroundBorderless"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:padding="5dp"
+            android:background="@drawable/selector_circle_btn_bg"
             android:contentDescription="@string/skip_previous"
             android:src="@drawable/ic_fast_rewind"
             app:tint="@color/md_white_1000"
@@ -157,11 +158,12 @@
             android:layout_height="1dp"
             android:layout_weight="1" />
 
-        <ImageView
+        <io.legado.app.ui.widget.image.ImageButton
             android:id="@+id/iv_skip_previous"
-            android:layout_width="36dp"
-            android:layout_height="36dp"
-            android:background="?attr/selectableItemBackgroundBorderless"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:padding="5dp"
+            android:background="@drawable/selector_circle_btn_bg"
             android:contentDescription="@string/skip_previous"
             android:src="@drawable/ic_skip_previous"
             app:tint="@color/md_white_1000"
@@ -181,11 +183,12 @@
             app:pressedTranslationZ="2dp"
             tools:ignore="ImageContrastCheck" />
 
-        <ImageView
+        <io.legado.app.ui.widget.image.ImageButton
             android:id="@+id/iv_skip_next"
-            android:layout_width="36dp"
-            android:layout_height="36dp"
-            android:background="?attr/selectableItemBackgroundBorderless"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:padding="5dp"
+            android:background="@drawable/selector_circle_btn_bg"
             android:contentDescription="@string/skip_next"
             android:src="@drawable/ic_skip_next"
             app:tint="@color/md_white_1000"
@@ -196,11 +199,12 @@
             android:layout_height="1dp"
             android:layout_weight="1" />
 
-        <ImageView
+        <io.legado.app.ui.widget.image.ImageButton
             android:id="@+id/iv_fast_forward"
-            android:layout_width="36dp"
-            android:layout_height="36dp"
-            android:background="?attr/selectableItemBackgroundBorderless"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:padding="5dp"
+            android:background="@drawable/selector_circle_btn_bg"
             android:contentDescription="@string/skip_next"
             android:src="@drawable/ic_fast_forward"
             app:tint="@color/md_white_1000"
@@ -211,11 +215,12 @@
             android:layout_height="1dp"
             android:layout_weight="1" />
 
-        <ImageView
+        <io.legado.app.ui.widget.image.ImageButton
             android:id="@+id/iv_chapter"
-            android:layout_width="36dp"
-            android:layout_height="36dp"
-            android:background="?attr/selectableItemBackgroundBorderless"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:padding="5dp"
+            android:background="@drawable/selector_circle_btn_bg"
             android:contentDescription="@string/chapter_list"
             android:src="@drawable/ic_chapter_list"
             app:tint="@color/md_white_1000"