TeamAmaze / TeamAmaze/AmazeFileManager
NPE on OTGUtil.getDocumentFiles when listing otg files
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Environment-API30
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Issue-Bug
- Dominant language
- Kotlin
- Stars
- 6.4k
- Forks
- 1.7k
- Avg merge
- 3d 9h
- Merged PRs (30d)
- 1
Description
Issue explanation (write below this line)
Exception
- User Action: UI Error
- Request: Application crash
- Version: 3.5.3
- OS: Linux Android 11 - 30
- Device: bramble
- Model: Pixel 4a (5G)
- Product: bramble
Crash log
java.lang.RuntimeException: An error occurred while executing
doInBackground()
at android.os.AsyncTask$4.done(AsyncTask.java:415)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:923)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method
'androidx.documentfile.provider.DocumentFile[]
androidx.documentfile.provider.DocumentFile.listFiles()' on a null object
reference
at com.amaze.filemanager.utils.OTGUtil.getDocumentFiles(OTGUtil.java:97)
at
com.amaze.filemanager.asynchronous.asynctasks.LoadFilesListTask.listOtg(LoadFilesListTask.java:491)
at
com.amaze.filemanager.asynchronous.asynctasks.LoadFilesListTask.doInBackground(LoadFilesListTask.java:185)
at
com.amaze.filemanager.asynchronous.asynctasks.LoadFilesListTask.doInBackground(LoadFilesListTask.java:67)
at android.os.AsyncTask$3.call(AsyncTask.java:394)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 more
.:.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading OTGUtil.getDocumentFiles in OTGUtil.java at line 97 and the call from LoadFilesListTask.listOtg at line 491. Reproduce or trace OTG file listing on Android 11, then determine the expected handling when the DocumentFile reference is null. Done means listing OTG files no longer crashes with this NullPointerException.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- android, java, kotlin
- Domain
- mobile
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100