OpenHAB Android App: Main UI shows blank page in remote mode

[fl0w (Flow)]

I can’t get OpenHAB Android 3.9.0 nor 3.10.0 to show the Main UI in remote mode (using OpenHAB 4.1.1).

While it shows the Main UI in local mode (note the Wifi symbol in the upper right corner):

The same thing looks empty once I turn of Wifi and go into the remote mode:

As far as I can tell, OpenHAB Android is able to retrieve and use the sitemap. It’s “just” the Main UI that does not show.

The Android log of the habdroid app also does not look suspicious (at least, to me):

2024-02-17 18:18:04.688  6743-6743  PageConnec...erFragment org.openhab.habdroid                 D  updateActiveConnections: URL list [https://myopenhab.org/rest/sitemaps/uicomponents_Sitemap/uicomponents_Sitemap], connection org.openhab.habdroid.core.connection.DefaultConnection@628eb6
2024-02-17 18:18:04.694  6743-6743  ServerConfiguration     org.openhab.habdroid                 D  load: ServerConfiguration(id=1, name=openHAB, localPath=ServerPath(url=https://192.168.188.43:8443/, userName=<redacted>, password=<redacted>), remotePath=ServerPath(url=https://myopenhab.org/, userName=<redacted>, password=<redacted>), sslClientCert=null, defaultSitemap=DefaultSitemap(name=uicomponents_Sitemap, label=Sitemap), wifiSsids=[MyWifi], restrictToWifiSsids=true, frontailUrl=null)
2024-02-17 18:18:04.710  6743-6743  WidgetListFragment      org.openhab.habdroid                 D  onPause() https://myopenhab.org/rest/sitemaps/uicomponents_Sitemap/uicomponents_Sitemap
2024-02-17 18:18:04.767  1996-5678  ConnectivityService     system_server                        D  requestNetwork for uid/pid:10485/6743 activeRequest: null callbackRequest: 11579 [NetworkRequest [ REQUEST id=11580, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VCN_MANAGED Uid: 10485 RequestorUid: 10485 RequestorPkg: org.openhab.habdroid UnderlyingNetworks: Null] ]] callback flags: 0 order: 2147483647
2024-02-17 18:18:04.773  1996-2794  WifiNetworkFactory      system_server                        D  got request NetworkRequest [ REQUEST id=11580, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VCN_MANAGED Uid: 10485 RequestorUid: 10485 RequestorPkg: org.openhab.habdroid UnderlyingNetworks: Null] ]
2024-02-17 18:18:04.774  1996-2794  UntrustedW...orkFactory system_server                        D  got request NetworkRequest [ REQUEST id=11580, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VCN_MANAGED Uid: 10485 RequestorUid: 10485 RequestorPkg: org.openhab.habdroid UnderlyingNetworks: Null] ]
2024-02-17 18:18:04.774  1996-2794  OemPaidWif...orkFactory system_server                        D  got request NetworkRequest [ REQUEST id=11580, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VCN_MANAGED Uid: 10485 RequestorUid: 10485 RequestorPkg: org.openhab.habdroid UnderlyingNetworks: Null] ]
2024-02-17 18:18:04.774  1996-2794  MultiInter...orkFactory system_server                        D  got request NetworkRequest [ REQUEST id=11580, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VCN_MANAGED Uid: 10485 RequestorUid: 10485 RequestorPkg: org.openhab.habdroid UnderlyingNetworks: Null] ]
2024-02-17 18:18:04.802  6743-6743  AbstractWebViewFragment org.openhab.habdroid                 D  Load default website
2024-02-17 18:18:04.862  1996-2278  ActivityManager         system_server                        I  Start proc 18445:com.google.android.webview:sandboxed_process0:org.chromium.content.app.SandboxedProcessService0:5/u0i414 for  {org.openhab.habdroid/org.chromium.content.app.SandboxedProcessService0:5}
2024-02-17 18:18:04.873  6743-6743  MainActivity            org.openhab.habdroid                 D  onCreateOptionsMenu()
2024-02-17 18:18:04.874  6743-6743  MainActivity            org.openhab.habdroid                 D  onPrepareOptionsMenu()
2024-02-17 18:18:04.913  6743-6743  AbstractWebViewFragment org.openhab.habdroid                 D  progressCallback: progress = 10
2024-02-17 18:18:05.107  1996-2052  CoreBackPreview         system_server                        D  Window{f002b3b u0 org.openhab.habdroid/org.openhab.habdroid.ui.MainActivity}: Setting back callback OnBackInvokedCallbackInfo{mCallback=android.window.IOnBackInvokedCallback$Stub$Proxy@24c606d, mPriority=0}
2024-02-17 18:18:05.242  6743-6743  AbstractWebViewFragment org.openhab.habdroid                 D  progressCallback: progress = 70
2024-02-17 18:18:05.262  6743-6743  AbstractWebViewFragment org.openhab.habdroid                 D  progressCallback: progress = 100
2024-02-17 18:18:05.262  6743-6743  AbstractWebViewFragment org.openhab.habdroid                 D  progressCallback: progress = 100

I am able to remotely access the Main UI via myopenhab.org, fwiw.

Is this a known issue? How can I fix it?

[sihui]

@fl0w

How can I fix it?

Some users were able to fix it via a workaround:

OpenHAB retured empty sitemap list

Go into OH Settings and change the Regional Settings Language to nothing: [image] Then save. Clear the Android App Cache Settings, Apps, openHAB, Storage, Clear Cache and Clear Data Try again. I also had to “Reload App” under App Help & About

[fl0w (Flow)]

@sihui

Some users were able to fix it via a workaround:

Thanks, but note that my Sitemap works fine, even remote. It is the Main UI that does not show. The thread you referenced seems to deal only about a non-functional sitemap. Or maybe I am missing something?

[sihui]

Why not just trying it out.

[fl0w (Flow)]

Tried it, and unfortunately the Main UI is still empty.

[fl0w (Flow)]

FWIW, I’ve reported this at

Main UI shows blank page in remote mode

[hyl0]

I think i found what the issue might be.

Ive had the same issue for a very long time, and i was playing around trying to figure out why when i open up the app it shows a completely blank page (but only under MainUI)

This has nothing to do with how you connect or where you connect from whether its local or remote. and it also has nothing to do with whether you are self-hosting or not. Clearing the cache also is not the fix.
Im personally self hosting and im using a local node to do some tests with only an internal IP address.

The temporary fix that worked for me:

While you are in the empty MainUI or blank page on the app. Just press the Square button on your android phone, ie. The Recent Apps button, where you would switch between other apps, and switch between another app and go back to the OpenHab app. or you can even Go to Home and switch back into the app. Suddenly the MainUI appeared for me.
I did this many times so its full-proof, at least for me.

What i think might be happening is, the MainUI does load successfully… but its just not shown, something that probably has to do with the “webview”.

Again this isnt a permanent fix but a quick temp fix, but at least we know where to look to fix the problem.

Just my opinion.
Would like to hear if anyone that has this issue can try this out and let me know