Attempt to invoke virtual method 'boolean android.os.HandlerThread.isAlive()'

[justinjoyn]

Describe the bug A clear and concise description of what the bug is.

On Android devices, the app crashes with following error:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.HandlerThread.isAlive()' on a null object reference
       at com.github.barteksc.pdfviewer.PDFView.loadComplete(PDFView.java:756)
       at com.github.barteksc.pdfviewer.DecodingAsyncTask.onPostExecute(DecodingAsyncTask.java:80)
       at com.github.barteksc.pdfviewer.DecodingAsyncTask.onPostExecute(DecodingAsyncTask.java:27)
       at android.os.AsyncTask.finish(AsyncTask.java:771)
       at android.os.AsyncTask.access$900(AsyncTask.java:199)
       at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loopOnce(Looper.java:233)
       at android.os.Looper.loop(Looper.java:344)
       at android.app.ActivityThread.main(ActivityThread.java:8248)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:589)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1071)

To Reproduce

• [x] I checked the demo project and cannot reproduce the issue
• [ ] I checked the demo project and the issue exists

Steps to reproduce the behavior:

1. Open a screen with the PDFView component which has a resource set as a remote URL.
2. Navigate away form the screen before the file loads.

Expected behavior Handle onLoad even after navigating away from the screen with PDFView component

Screenshots If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: Motorola G60
• OS: Android
• Android Version 12

Additional context Here are the related dependencies and their versions on our app.

        "@react-navigation/bottom-tabs": "6.3.3",
        "@react-navigation/native": "6.0.12",
        "@react-navigation/native-stack": "6.8.0",
        "react": "17.0.2",
        "react-native": "0.67.4",
        "react-native-view-pdf": "0.14.0",

[rumax]

Hi @justinjoyn , when does this issue exactly happens, is app/screen active at this moment or it is some background or other screen state? Is it also some specific pdf (if so can you share it) or any?

I see barteksc/AndroidPdfViewer has open issue which might be similar to what you reported.

[justinjoyn]

@rumax Thank you for looking into this. This is happening when we unmount the screen while PDFView is still loading the file. It might not be file specific because I tried with different files (mostly larger files since they take time to load).

[justinjoyn]

Hey @rumax were you able to reproduce this at your end? Please share if you have any updates.

[justinjoyn]

Issues filed on the Android dependency:

1. https://github.com/barteksc/AndroidPdfViewer/issues/991
2. https://github.com/barteksc/AndroidPdfViewer/issues/1086

A possible fix already exists. Here's the PR: https://github.com/barteksc/AndroidPdfViewer/pull/917

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[FaggioniHQ]

Hello there,

Any news on this? Any workaround???

Thanks in advance

[rumax]

@FaggioniHQ as you can find from discussion above, it seems to be an issue in barteksc/AndroidPdfViewer. As a workaround, you can try to identify the specific circumstances in your project that trigger the issue and attempt to avoid them. Alternatively, if you're inclined to contribute, you have the option to submit a pull request to address and fix the problem in the library.

[FaggioniHQ]

hello @rumax ,

Thanks for your reply... I fixed the issue by using the latest version of https://github.com/mhiew/AndroidPdfViewer

On the latest version, the issue was fixed

buildscript {
 ext {
   ...
   pdfViewerVersion = "3.2.0-beta.3"
   pdfViewerRepo = "com.github.mhiew"
 }
 ...
}

[rumax]

Maybe com.github.mhiew has to be default dependency. It also solves JCenter issue.