优化

app/src/main/java/io/legado/app/help/config/ReadBookConfig.kt

@@ -37,7 +37,6 @@ object ReadBookConfig {
             if (shareLayout) {
                 shareConfig = value
             }
-            upBg()
         }
 
     var bg: Drawable? = null
@@ -88,11 +87,8 @@ object ReadBookConfig {
         shareConfig = c ?: configList.getOrNull(5) ?: Config()
     }
 
-    fun upBg() {
-        val resources = appCtx.resources
-        val dm = resources.displayMetrics
-        val width = dm.widthPixels
-        val height = dm.heightPixels
+    fun upBg(width: Int, height: Int) {
+        val tmp = bg
         bg = durConfig.curBgDrawable(width, height).apply {
             if (this is BitmapDrawable) {
                 bgMeanColor = bitmap.getMeanColor()
@@ -100,6 +96,7 @@ object ReadBookConfig {
                 bgMeanColor = color
             }
         }
+        (tmp as? BitmapDrawable)?.bitmap?.recycle()
     }
 
     fun save() {
@@ -123,7 +120,6 @@ object ReadBookConfig {
             if (styleSelect > 0) {
                 styleSelect -= 1
             }
-            upBg()
             return true
         }
         return false
@@ -572,11 +568,11 @@ object ReadBookConfig {
                     1 -> {
                         val path = "bg" + File.separator + curBgStr()
                         val bitmap = BitmapUtils.decodeAssetsBitmap(appCtx, path, width, height)
-                        BitmapDrawable(resources, bitmap)
+                        BitmapDrawable(resources, bitmap?.changeSize(width, height))
                     }
                     else -> {
                         val bitmap = BitmapUtils.decodeBitmap(curBgStr(), width, height)
-                        BitmapDrawable(resources, bitmap)
+                        BitmapDrawable(resources, bitmap?.changeSize(width, height))
                     }
                 }
             } catch (e: OutOfMemoryError) {

app/src/main/java/io/legado/app/help/config/ThemeConfig.kt

@@ -38,7 +38,6 @@ object ThemeConfig {
     }
 
     fun applyDayNight(context: Context) {
-        ReadBookConfig.upBg()
         applyTheme(context)
         initNightMode()
         BookCover.upDefaultCover()

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -984,7 +984,6 @@ class ReadBookActivity : BaseReadBookActivity(),
             }
             BG_COLOR -> {
                 setCurBg(0, "#${color.hexString}")
-                ReadBookConfig.upBg()
                 postEvent(EventBus.UP_CONFIG, false)
             }
             TIP_COLOR -> {

app/src/main/java/io/legado/app/ui/book/read/config/BgAdapter.kt

@@ -41,7 +41,6 @@ class BgAdapter(context: Context, val textColor: Int) :
             this.setOnClickListener {
                 getItemByLayoutPosition(holder.layoutPosition)?.let {
                     ReadBookConfig.durConfig.setCurBg(1, it)
-                    ReadBookConfig.upBg()
                     postEvent(EventBus.UP_CONFIG, false)
                 }
             }

app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt

@@ -358,7 +358,6 @@ class BgTextConfigDialog : BaseDialogFragment(R.layout.dialog_read_bg_text) {
                 inputStream.copyTo(outputStream)
             }
             ReadBookConfig.durConfig.setCurBg(2, file.absolutePath)
-            ReadBookConfig.upBg()
             postEvent(EventBus.UP_CONFIG, false)
         }
     }

app/src/main/java/io/legado/app/ui/book/read/config/ReadStyleDialog.kt

@@ -158,7 +158,6 @@ class ReadStyleDialog : BaseDialogFragment(R.layout.dialog_read_book_style),
         val oldIndex = ReadBookConfig.styleSelect
         if (index != oldIndex) {
             ReadBookConfig.styleSelect = index
-            ReadBookConfig.upBg()
             upView()
             styleAdapter.notifyItemChanged(oldIndex)
             styleAdapter.notifyItemChanged(index)

app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt

@@ -2,7 +2,6 @@ package io.legado.app.ui.book.read.page
 
 import android.annotation.SuppressLint
 import android.content.Context
-import android.graphics.drawable.Drawable
 import android.view.LayoutInflater
 import android.widget.FrameLayout
 import androidx.core.view.isGone
@@ -59,6 +58,11 @@ class PageView(context: Context) : FrameLayout(context) {
         }
     }
 
+    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+        super.onSizeChanged(w, h, oldw, oldh)
+        upBg()
+    }
+
     fun upStyle() = binding.run {
         upTipStyle()
         ReadBookConfig.let {
@@ -197,9 +201,9 @@ class PageView(context: Context) : FrameLayout(context) {
         }
     }
 
-    fun setBg(bg: Drawable?) {
+    fun upBg() {
         binding.vwRoot.backgroundColor = ReadBookConfig.bgMeanColor
-        binding.vwBg.background = bg
+        binding.vwBg.background = ReadBookConfig.bg
         upBgAlpha()
     }
 

app/src/main/java/io/legado/app/ui/book/read/page/ReadView.kt

@@ -486,12 +486,10 @@ class ReadView(context: Context, attrs: AttributeSet) :
     }
 
     fun upBg() {
-        ReadBookConfig.bg ?: let {
-            ReadBookConfig.upBg()
-        }
-        curPage.setBg(ReadBookConfig.bg)
-        prevPage.setBg(ReadBookConfig.bg)
-        nextPage.setBg(ReadBookConfig.bg)
+        ReadBookConfig.upBg(width, height)
+        curPage.upBg()
+        prevPage.upBg()
+        nextPage.upBg()
     }
 
     fun upBgAlpha() {