Resolve #865

app/src/main/java/com/hippo/ehviewer/gallery/ArchivePageLoader.kt

@@ -117,6 +117,9 @@ class ArchivePageLoader(context: Context, uri: Uri, passwdFlow: Flow<String>) :
         return size != 0
     }
 
+    override val isReady: Boolean
+        get() = size != 0
+
     override fun onCancelRequest(index: Int) {
         mJobMap[index]?.cancel()
     }

app/src/main/java/com/hippo/ehviewer/gallery/EhPageLoader.kt

@@ -100,6 +100,9 @@ class EhPageLoader(private val mGalleryInfo: GalleryInfo) : PageLoader2(), OnSpi
         return mSpiderQueen.awaitReady()
     }
 
+    override val isReady: Boolean
+        get() = mSpiderQueen.isReady
+
     override fun onCancelRequest(index: Int) {
         mSpiderQueen.cancelRequest(index)
     }

app/src/main/java/com/hippo/ehviewer/spider/SpiderQueen.kt

@@ -166,7 +166,7 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
     }
 
     private var downloadMode = false
-    private val isReady
+    val isReady
         get() = this::mSpiderInfo.isInitialized && this::mPageStateArray.isInitialized
 
     @Synchronized