Use official APIs to load dynamic resources

app/shared/src/main/java/com/topjohnwu/magisk/StubApk.java

@@ -1,14 +1,20 @@
 package com.topjohnwu.magisk;
 
 import static android.os.Build.VERSION.SDK_INT;
+import static android.os.ParcelFileDescriptor.MODE_READ_ONLY;
 
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.res.AssetManager;
+import android.content.res.Resources;
+import android.content.res.loader.ResourcesLoader;
+import android.content.res.loader.ResourcesProvider;
+import android.os.ParcelFileDescriptor;
 
 import java.io.File;
+import java.io.IOException;
 import java.lang.reflect.Method;
 import java.util.Map;
 
@@ -50,12 +56,21 @@ public class StubApk {
         return new File(getDynDir(info), "update.apk");
     }
 
-    public static void addAssetPath(AssetManager asset, String path) {
-        try {
-            if (addAssetPath == null)
-                addAssetPath = AssetManager.class.getMethod("addAssetPath", String.class);
-            addAssetPath.invoke(asset, path);
-        } catch (Exception ignored) {}
+    public static void addAssetPath(Resources res, String path) {
+        if (SDK_INT >= 30) {
+            try (var fd = ParcelFileDescriptor.open(new File(path), MODE_READ_ONLY)) {
+                var loader = new ResourcesLoader();
+                loader.addProvider(ResourcesProvider.loadFromApk(fd));
+                res.addLoaders(loader);
+            } catch (IOException ignored) {}
+        } else {
+            AssetManager asset = res.getAssets();
+            try {
+                if (addAssetPath == null)
+                    addAssetPath = AssetManager.class.getMethod("addAssetPath", String.class);
+                addAssetPath.invoke(asset, path);
+            } catch (Exception ignored) {}
+        }
     }
 
     public static void restartProcess(Activity activity) {

app/src/main/java/com/topjohnwu/magisk/core/Hacks.kt

@@ -18,7 +18,7 @@ import com.topjohnwu.magisk.di.AppContext
 
 lateinit var AppApkPath: String
 
-fun AssetManager.addAssetPath(path: String) = StubApk.addAssetPath(this, path)
+fun Resources.addAssetPath(path: String) = StubApk.addAssetPath(this, path)
 
 fun Context.wrap(): Context = if (this is PatchedContext) this else PatchedContext(this)
 
@@ -32,17 +32,18 @@ private class PatchedContext(base: Context) : ContextWrapper(base) {
 fun Resources.patch(): Resources {
     syncLocale()
     if (isRunningAsStub)
-        assets.addAssetPath(AppApkPath)
+        addAssetPath(AppApkPath)
     return this
 }
 
 fun createNewResources(): Resources {
     val asset = AssetManager::class.java.newInstance()
-    asset.addAssetPath(AppApkPath)
     val config = Configuration(AppContext.resources.configuration)
     val metrics = DisplayMetrics()
     metrics.setTo(AppContext.resources.displayMetrics)
-    return Resources(asset, metrics, config)
+    val res = Resources(asset, metrics, config)
+    res.addAssetPath(AppApkPath)
+    return res
 }
 
 fun Class<*>.cmp(pkg: String) =