优化

app/src/main/java/io/legado/app/constant/PreferKey.kt

@@ -111,6 +111,7 @@ object PreferKey {
     const val welcomeShowIconDark = "welcomeShowIconDark"
     const val pageTouchSlop = "pageTouchSlop"
     const val showAddToShelfAlert = "showAddToShelfAlert"
+    const val asyncLoadImage = "asyncLoadImage"
 
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"

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

@@ -320,6 +320,8 @@ object AppConfig : SharedPreferences.OnSharedPreferenceChangeListener {
 
     val showAddToShelfAlert get() = appCtx.getPrefBoolean(PreferKey.showAddToShelfAlert, true)
 
+    val asyncLoadImage get() = appCtx.getPrefBoolean(PreferKey.asyncLoadImage, false)
+
     val doublePageHorizontal: String?
         get() = appCtx.getPrefString(PreferKey.doublePageHorizontal)
 

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

@@ -4,6 +4,7 @@ import android.content.Context
 import android.graphics.Canvas
 import android.graphics.Paint
 import android.graphics.RectF
+import android.os.Build
 import android.util.AttributeSet
 import android.view.View
 import io.legado.app.R
@@ -51,7 +52,11 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     private var drawVisibleImageOnly = false
     private var cacheIncreased = false
     private val increaseSize = 8 * 1024 * 1024
-    private val maxCacheSize = 256 * 1024 * 1024
+    private val maxCacheSize = if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.N_MR1) {
+        min(128 * 1024 * 1024, Runtime.getRuntime().maxMemory())
+    } else {
+        256 * 1024 * 1024
+    }
 
     //滚动参数
     private val pageFactory: TextPageFactory get() = callBack.pageFactory
@@ -203,7 +208,6 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
             return
         }
         if (drawVisibleImageOnly &&
-            isVisible &&
             !cacheIncreased &&
             ImageProvider.isTriggerRecycled() &&
             !ImageProvider.isImageAlive(book, column.src)

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

@@ -131,7 +131,7 @@ object ImageProvider {
         //bitmapLruCache的key同一改成缓存文件的路径
         val cacheBitmap = bitmapLruCache.get(vFile.absolutePath)
         if (cacheBitmap != null) return cacheBitmap
-        if (height != null && ReadBook.pageAnim() == PageAnim.scrollPageAnim) {
+        if (height != null && AppConfig.asyncLoadImage && ReadBook.pageAnim() == PageAnim.scrollPageAnim) {
             Coroutine.async {
                 kotlin.runCatching {
                     val bitmap = BitmapUtils.decodeBitmap(vFile.absolutePath, width, height)

app/src/main/res/values-es-rES/strings.xml

@@ -1028,4 +1028,5 @@
     <string name="rule_image_decode">Decode Image(imageDecode)</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/values-ja-rJP/strings.xml

@@ -1031,4 +1031,5 @@
     <string name="rule_image_decode">Decode Image(imageDecode)</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/values-pt-rBR/strings.xml

@@ -1031,4 +1031,5 @@
     <string name="rule_image_decode">Decode Image(imageDecode)</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/values-zh-rHK/strings.xml

@@ -1028,4 +1028,5 @@
     <string name="rule_image_decode">图片解密（imageDecode）</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/values-zh-rTW/strings.xml

@@ -1030,4 +1030,5 @@
     <string name="rule_image_decode">图片解密（imageDecode）</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/values-zh/strings.xml

@@ -1030,4 +1030,5 @@
     <string name="rule_image_decode">图片解密（imageDecode）</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -1031,4 +1031,5 @@
     <string name="rule_image_decode">Decode Image(imageDecode)</string>
     <string name="like_source">赞</string>
     <string name="not_like_source">踩</string>
+    <string name="async_load_image">异步加载图片</string>
 </resources>

app/src/main/res/xml/pref_config_read.xml

@@ -120,6 +120,13 @@
         app:iconSpaceReserved="false"
         app:isBottomBackground="true" />
 
+    <io.legado.app.lib.prefs.SwitchPreference
+        android:defaultValue="false"
+        android:key="asyncLoadImage"
+        android:title="@string/async_load_image"
+        app:iconSpaceReserved="false"
+        app:isBottomBackground="true" />
+
     <io.legado.app.lib.prefs.Preference
         android:key="clickRegionalConfig"
         android:title="@string/click_regional_config"