zhanghai / zhanghai/MaterialFiles

Attempting to change language causes crash

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#1,009 2 comments 2 reactions 0 assignees View on GitHub

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Dominant language
Kotlin
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Description

Device: Redmi Note 10 Pro
Android: 13
Material Files: v1.6.0 (F-Droid)

Steps to reproduce:

  1. Open navigation drawer
  2. Go to Settings
  3. Tap on Language
  4. The app either returns home or causes a crash.

The log generated by the system is attached below:

Crash log

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.settings/com.android.settings.localepicker.AppLocalePickerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object reference
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3834)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3980)
	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2394)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:211)
	at android.os.Looper.loop(Looper.java:300)
	at android.app.ActivityThread.main(ActivityThread.java:8296)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:559)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:954)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object reference
	at com.android.settings.localepicker.AppLocalePickerActivity.onCreate(AppLocalePickerActivity.java:75)
	at android.app.Activity.performCreate(Activity.java:8523)
	at android.app.Activity.performCreate(Activity.java:8487)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1438)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3815)
	... 12 more


Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the Settings > Language entry point on Android 13 and trace how the app launches the locale picker. Use the attached AppLocalePickerActivity crash log to identify the failing path. Done means opening Language no longer returns home or crashes.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, kotlin
Domain
mobile
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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