feat:add LruCache

https://developer.android.google.cn/reference/kotlin/androidx/collection/LruCache

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

@@ -3,6 +3,7 @@ package io.legado.app.ui.book.read.page.provider
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.util.Size
+import androidx.collection.LruCache
 import io.legado.app.R
 import io.legado.app.constant.AppLog.putDebug
 import io.legado.app.data.entities.Book
@@ -23,6 +24,33 @@ object ImageProvider {
         BitmapFactory.decodeResource(appCtx.resources, R.drawable.image_loading_error)
     }
 
+    /**
+     *缓存bitmap LruCache实现
+     */
+    //private val maxMemory = Runtime.getRuntime().maxMemory()
+    //private val cacheMemorySize = (maxMemory / 8) as Int
+    private val cacheMemorySize: Int = 1024 * 1024 * 1024 //1G
+    private val bitmapLruCache = object : LruCache<String, Bitmap>(cacheMemorySize) {
+        override fun sizeOf(key: String, bitmap: Bitmap): Int {
+            return bitmap.getByteCount()
+        }
+        override fun entryRemoved(
+            evicted: Boolean,
+            key: String,
+            oldBitmap: Bitmap,
+            newBitmap: Bitmap?
+        ) {
+            if (evicted) {
+               oldBitmap.recycle()
+               putDebug("自动回收Bitmap path: $key")
+               putDebug("bitmapLruCache : ${size()} / ${maxSize()}")
+            }
+        }
+    }
+
+    /**
+     *缓存网络图片和epub图片
+     */
     suspend fun cacheImage(
         book: Book,
         src: String,
@@ -45,6 +73,9 @@ object ImageProvider {
         return vFile
     }
 
+    /**
+     *获取图片宽度高度信息
+     */
     suspend fun getImageSize(
         book: Book,
         src: String,
@@ -58,16 +89,23 @@ object ImageProvider {
         return Size(op.outWidth, op.outHeight)
     }
 
+    /**
+     *获取bitmap 使用LruCache缓存
+     */
     fun getImage(
         book: Book,
         src: String,
         width: Int,
         height: Int
     ): Bitmap {
+        val cacheBitmap = bitmapLruCache.get(src)
+        if (cacheBitmap != null) return cacheBitmap
         val vFile = BookHelp.getImage(book, src)
         @Suppress("BlockingMethodInNonBlockingContext")
         return try {
-            BitmapUtils.decodeBitmap(vFile.absolutePath, width, height)
+            val bitmap = BitmapUtils.decodeBitmap(vFile.absolutePath, width, height)
+            bitmapLruCache.put(src, bitmap)
+            bitmap
         } catch (e: Exception) {
             Coroutine.async {
                 putDebug("${vFile.absolutePath} 解码失败\n$e", e)
@@ -80,15 +118,22 @@ object ImageProvider {
         }
     }
 
+   /**
+    *获取bitmap 使用LruCache缓存
+    */
     fun getImage(
         book: Book,
         src: String,
         width: Int
     ): Bitmap {
+        val cacheBitmap = bitmapLruCache.get(src)
+        if (cacheBitmap != null) return cacheBitmap
         val vFile = BookHelp.getImage(book, src)
         @Suppress("BlockingMethodInNonBlockingContext")
         return try {
-            BitmapUtils.decodeBitmap(vFile.absolutePath, width)
+            val bitmap = BitmapUtils.decodeBitmap(vFile.absolutePath, width)
+            bitmapLruCache.put(src, bitmap)
+            bitmap
         } catch (e: Exception) {
             Coroutine.async {
                 putDebug("${vFile.absolutePath} 解码失败\n$e", e)