WebUIActivity crashes on launch — NoSuchMethodException: FileChooserInterface.<init>(WXOptions)

[Bouteillepleine]

Summary

Opening any module''s WebUI crashes the activity during view attach, before the module content loads. The crash comes from the built-in FileChooserInterface being instantiated by reflection with a constructor signature (WXOptions) that does not exist on the resolved class. It is module-independent — the same modules open fine with the legacy engine ("WebUI MX").

Environment

• WebUI-X-Portable v537-release (versionCode 537), package com.dergoogler.mmrl.wx.alpha
• Android 16 (SDK 36), Android System WebView 150.0.7871.46
• Device: OnePlus 15 (canoe), OxygenOS CPH2747_16.0.8.300
• Root: KernelSU 4.1.0 (SukiSU/ReSukiSU)

Steps to reproduce

1. Install any KernelSU module shipping a webroot/ WebUI (minimal config.json {"title":"X","icon":"icon.png"} is enough).
2. Open its WebUI with WebUI-X (launches com.dergoogler.mmrl.wx.ui.activity.webui.WebUIActivity).

Expected

The module WebUI renders.

Actual

The activity window dies right after setContentView / onAttachedToWindow ("app died, no saved state", "Channel is unrecoverably broken"). The WebUI never loads. The same module works with the legacy WebUI engine.

Logcat (key stack trace)

E JavaScriptInterfaceImplementation.createNewWX(...): Failed to create WX instance for FileChooserInterface
E JavaScriptInterfaceImplementation.createNewWX(...): java.lang.NoSuchMethodException:
    com.dergoogler.mmrl.hybridwebui.interfaces.prebuilt.FileChooserInterface.<init>
    [class com.dergoogler.mmrl.webui.interfaces.WXOptions]
    at java.lang.Class.getConstructor0(Class.java:3387)
    at java.lang.Class.getDeclaredConstructor(Class.java:3069)
    at com.dergoogler.mmrl.ext.JavaScriptInterfaceExtKt.createNewWX(JavaScriptInterfaceExt.kt:16)
    at com.dergoogler.mmrl.webui.view.WebUIView.addJavascriptInterface(WebUIView.kt:267)
    at com.dergoogler.mmrl.wx.ui.activity.webui.WebUIActivity.init$lambda$4$lambda$3$lambda$2(WebUIActivity.kt:219)
    at com.dergoogler.mmrl.hybridwebui.HybridWebUI.setupDependencies(HybridWebUI.kt:106)
    at com.dergoogler.mmrl.hybridwebui.HybridWebUI.onAttachedToWindow(HybridWebUI.kt:77)
    at android.view.View.dispatchAttachedToWindow(View.java:23638)
    ...

Analysis

JavaScriptInterfaceExtKt.createNewWX reflectively resolves FileChooserInterface.<init>(com.dergoogler.mmrl.webui.interfaces.WXOptions), but the bundled com.dergoogler.mmrl.hybridwebui.interfaces.prebuilt.FileChooserInterface has no such constructor — a version skew between the hybridwebui and webui modules in this build. Since this prebuilt interface is injected for every module, no WebUI can open.

Suggested fixes: align the hybridwebui / webui versions, or guard createNewWX so a missing prebuilt-interface constructor is logged and skipped instead of crashing the activity.

[DerGoogler]

Just to note: The MX Engine is not legacy, the WX Engine is legacy.