掲示板 Forums - [Megathread] Blank/Blue/Black screen issue (Android)

Cause: a recent update to Android System Webview, an app run and updated by Google that is used by many apps, including renshuu, is causing issue to some apps in certain situations.

Temporary Fix 1 (works for some people): Long press the app icon on your phone, then go to Info > Memory/Cache. Clear all of this out (this will not remove any of your account data, just log you out). Open the app again, then log in.

Temporary Fix 2 ("stronger" fix than #1): You'll need to remove the updates to Android System Webview. How to do so:

(layout may vary slightly depending on your Android version).

1. Go to the Phone's Settings

2. Find the Apps section/category

3. Go to "All Apps", then find "Android System Webview" - Tap to view information.

4. Somewhere on that page, you should have an option to "Uninstall updates". For my phone, it was hidden in the vertical ... icon in the top-right. Do that.

5. Run renshuu again.

However, if you are uncomfortable making this change, do know that you can always open up renshuu.org in your browser of choice on your phone, then log into the same account that you use with the renshuu app.

I will be monitoring this, and will update this thread when we believe that the newest version of Webview works with renshuu and other apps.

==== Original post ====

As this is popping up in a number of thread and messages, I'd like to use this to keep all the information in one place.

1. Temporary fix: long press on the app icon. Then go to (wording may be slightly different) "more info" > "data/cache", then clear out all data AND cache. This will not clear out any renshuu data, only log you out. After that, log back in.

2. After doing #1, if it happens again (not earlier, but after reading this post and doing the step above), please report here with the following:
A. Android version
B. renshuu version (it is the bottom-left in renshuu's pop-out menu)
C. What was the thing you were doing in renshuu when it happened.
D. Is there anything else you can do in renshuu via the menu? (Return via the home button, load mail/settings, etc.)?

E. Please go to your Android's settings, then go to the Apps section. Go to where you can see all the apps, then look for one called Android System Webview. tap on that, and let me know what version you have.

Thanks. I do not have any proof yet, but strongly suspect a recent Webview update by Google is causing the issue. I cannot replicate it on my device yet. I cannot take responsibility for this, but for those who are comfortable with this, installing an earlier version (maybe 2-3 weeks ago) of Android System Webview would be a good thing to test. There are numerous sites such as apkmirror.com where you can download previous versions of apps.

​I originally had 147.0.7727.137 with the issue. Rolling back to the stock on my device put me at 126.0.6478.71 and I couldn't reproduce the issue.

Then I downloaded the Dev version from the Play Store, version 150.0.7828.3 and haven't been able to reproduce it either. Hopefully that means a fix is in the pipeline from Google.

I saw the Beta version is at 149.0.7827.13 but I didn't try it. Both the Beta and Dev versions say they are updated weekly. There's also a Canary version for a daily build.

Annoyingly the Play Store doesn't flag there's an update to the "normal" version for me to re-test version 147 that I had. Maybe it will appear later.

The problem still occurs on WebView Dev 150.0.7838.2.

Uninstalling and reverting to 131.0.6778.260.

​What I meant is, the solution proposed by クリス～エム does NOT work. What works is uninstalling updates from Android WebView.

I was able to confirm that the version 146.0.7668.0 of Android WebView Dev (available on APKMirror) works without issues.

You can install it alongside the stock version and set it as default in Developer Options. Make sure, however, to uncheck 'Enable auto update' on the app's page in Google Play Store, so that it doesn't get overwritten.

Do we still want to try to debug more? There are some options described here, maybe logging webview stuff to logcat could be interesting https://chromium.googlesource....

Other than that Michael could consider filing a bug, but they might want a minimally reproducible example https://issues.chromium.org/is...

I haven't found an open bug that matches the description of what we're experiencing.

This appears to be either the same bug or a related one.

https://issues.chromium.org/is...

I would be absolutely thrilled to have you or someone else who can reproduce the bug post in a new thread on the chromium bug tracker - I'd do it myself if I was experiencing the issue :(

マイコー,

I've been trying to debug the app through Android's USB Debugging in tandem with chrome://inspect, unfortunately to no avail.
It allowed me to inspect pages from my phone's browser on desktop, but it didn't detect any input from the Renshuu app.

I am no programmer, but apparently there's a way to enable WebView debugging by setting the "setWebContentsDebuggingEnabled" method to "true". Would you consider realeasing a build with WebView debugging enabled? Unless it poses a security risk, of course.

For the past few days I've been seeing a black screen issue consistently during vocabulary quizzes, particularly on getting a listening question wrong - I've had to go to the home screen then return to quiz to continue. Webview version is 148.0.7778.120.

Uninstalling updates on Android Webview fixed it for me.

Other possibly relevant clues: I'm on Android 14, I'm using custom keyboards (Unexpected and Sumire), and it's happening on wifi and 4g. From what I can tell the content is present in the webview, it's just not being rendered; when I did the workaround of navigating to home, the content appeared briefly before the new page loaded.