优化

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

@@ -73,7 +73,7 @@ object ThemeConfig {
         if (bgCfg.second == 0) {
             return bgImage
         }
-        return bgImage.stackBlur(bgCfg.second)
+        return bgImage?.stackBlur(bgCfg.second)
     }
 
     fun upConfig() {

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

@@ -8,6 +8,7 @@ import io.legado.app.R
 import io.legado.app.constant.AppLog.putDebug
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookSource
+import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.BookHelp
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.model.localBook.EpubFile
@@ -110,6 +111,7 @@ object ImageProvider {
         @Suppress("BlockingMethodInNonBlockingContext")
         return try {
             val bitmap = BitmapUtils.decodeBitmap(vFile.absolutePath, width, height)
+                ?: throw NoStackTraceException("解析图片失败")
             bitmapLruCache.put(src, bitmap)
             bitmap
         } catch (e: Exception) {

app/src/main/java/io/legado/app/utils/BitmapUtils.kt

@@ -27,8 +27,7 @@ object BitmapUtils {
      * @return
      */
     @Throws(IOException::class)
-    fun decodeBitmap(path: String, width: Int, height: Int? = null): Bitmap {
+    fun decodeBitmap(path: String, width: Int, height: Int? = null): Bitmap? {
-
         val fis = FileInputStream(path)
         return fis.use {
             val op = BitmapFactory.Options()
@@ -38,7 +37,6 @@ object BitmapUtils {
             op.inSampleSize = calculateInSampleSize(op, width, height)
             op.inJustDecodeBounds = false
             BitmapFactory.decodeFileDescriptor(fis.fd, null, op)
-
         }
     }
 
@@ -71,7 +69,7 @@ object BitmapUtils {
      * @return
      */
     @Throws(IOException::class)
-    fun decodeBitmap(path: String): Bitmap {
+    fun decodeBitmap(path: String): Bitmap? {
         val fis = FileInputStream(path)
         return fis.use {
             val opts = BitmapFactory.Options()
@@ -82,7 +80,6 @@ object BitmapUtils {
             opts.inJustDecodeBounds = false
             BitmapFactory.decodeFileDescriptor(fis.fd, null, opts)
         }
-
     }
 
     /**