refactor: extract viewerAssetLoader

AnkiDroid/src/main/java/com/ichi2/anki/AbstractFlashcardViewer.kt

@@ -96,7 +96,6 @@ import com.ichi2.themes.Themes
 import com.ichi2.themes.Themes.getResFromAttr
 import com.ichi2.ui.FixedEditText
 import com.ichi2.utils.*
-import com.ichi2.utils.AssetHelper.guessMimeType
 import com.ichi2.utils.ClipboardUtil.getText
 import com.ichi2.utils.HandlerUtils.executeFunctionWithDelay
 import com.ichi2.utils.HandlerUtils.newHandler
@@ -1059,27 +1058,8 @@ abstract class AbstractFlashcardViewer :
     }
 
     protected open fun createWebView(): WebView {
-        val mediaDir = CollectionHelper.getMediaDirectory(this).path
         val domain = "$LOCALHOST:${server.listeningPort}"
-        val assetLoader = WebViewAssetLoader.Builder()
-            .setHttpAllowed(true)
-            .setDomain(domain)
-            .addPathHandler("/web/") { path: String ->
-                val inputStream = this.javaClass.classLoader!!.getResourceAsStream("web/$path")
-                WebResourceResponse(guessMimeType(path), null, inputStream)
-            }
-            .addPathHandler("/") { path: String ->
-                try {
-                    val file = File(mediaDir, path)
-                    val inputStream = FileInputStream(file)
-                    WebResourceResponse(guessMimeType(path), null, inputStream)
-                } catch (e: Exception) {
-                    Timber.w(e, "Error trying to open path in asset loader: %s", path)
-                    null
-                }
-            }
-            .build()
-
+        val assetLoader = getViewerAssetLoader(domain)
         val webView: WebView = MyWebView(this).apply {
             scrollBarStyle = View.SCROLLBARS_OUTSIDE_OVERLAY
             with(settings) {

AnkiDroid/src/main/java/com/ichi2/anki/ViewerAssetLoader.kt

@@ -0,0 +1,50 @@
+/*
+ *  Copyright (c) 2023 Brayan Oliveira <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 3 of the License, or (at your option) any later
+ *  version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.ichi2.anki
+
+import android.content.Context
+import android.webkit.WebResourceResponse
+import androidx.webkit.WebViewAssetLoader
+import com.ichi2.utils.AssetHelper.guessMimeType
+import timber.log.Timber
+import java.io.File
+import java.io.FileInputStream
+
+fun Context.getViewerAssetLoader(domain: String): WebViewAssetLoader {
+    val mediaDir = CollectionHelper.getMediaDirectory(this)
+    return WebViewAssetLoader.Builder()
+        .setHttpAllowed(true)
+        .setDomain(domain)
+        .addPathHandler("/assets/") { path ->
+            val inputStream = assets.open(path)
+            WebResourceResponse(guessMimeType(path), null, inputStream)
+        }
+        .addPathHandler("/web/") { path: String ->
+            val inputStream = this.javaClass.classLoader!!.getResourceAsStream("web/$path")
+            WebResourceResponse(guessMimeType(path), null, inputStream)
+        }
+        .addPathHandler("/") { path: String ->
+            try {
+                val file = File(mediaDir, path)
+                val inputStream = FileInputStream(file)
+                WebResourceResponse(guessMimeType(path), null, inputStream)
+            } catch (e: Exception) {
+                Timber.w(e, "Error trying to open path in asset loader: %s", path)
+                null
+            }
+        }
+        .build()
+}