GitLab

• Android version: 10
• Phone model: Google Pixel 2 XL (taimen)
• Briar version: 1.2.4 (75dfa805)
• User feedback: "Opened the app after many messages were sent."

Stacktrace:

java.lang.NullPointerException: Attempt to read from field 'android.widget.ImageView org.briarproject.briar.android.contact.ContactItemViewHolder.avatar' on a null object reference
        at org.briarproject.briar.android.contact.ContactListFragment.lambda$onCreateView$0$ContactListFragment(ContactListFragment.java:140)
        at org.briarproject.briar.android.contact.-$$Lambda$ContactListFragment$DvpyzIeg2gO44NHGy22U4l_irhw.onItemClick(Unknown Source:4)
        at org.briarproject.briar.android.contact.ContactItemViewHolder.lambda$bind$0$ContactItemViewHolder(ContactItemViewHolder.java:58)
        at org.briarproject.briar.android.contact.-$$Lambda$ContactItemViewHolder$M1B1WNtK1OEXOZpZndUVONB779k.onClick(Unknown Source:6)
        at android.view.View.performClick(View.java:7140)
        at android.view.View.performClickInternal(View.java:7117)
        at android.view.View.access$3500(View.java:801)
        at android.view.View$PerformClick.run(View.java:27351)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

Edited log:

11-26 19:32:16.943 I/AndroidNetworkManager: Received broadcast android.intent.action.SCREEN_OFF
11-26 19:32:25.628 I/BaseActivity: Starting ConversationActivity
11-26 19:32:25.674 I/BaseActivity: Starting UnlockActivity
11-26 19:32:25.697 I/BaseActivity: Stopping UnlockActivity
11-26 19:32:25.698 I/BaseActivity: Stopping ConversationActivity
11-26 19:32:25.751 I/BaseActivity: Starting UnlockActivity
11-26 19:32:25.776 I/AndroidNetworkManager: Received broadcast android.intent.action.SCREEN_ON
11-26 19:32:25.997 I/BaseActivity: Starting NavDrawerActivity
11-26 19:32:26.025 I/BaseActivity: Starting UnlockActivity
11-26 19:32:26.103 I/BaseActivity: Stopping NavDrawerActivity
11-26 19:32:26.207 I/BaseActivity: Stopping UnlockActivity
11-26 19:32:26.830 I/BaseActivity: Starting NavDrawerActivity
11-26 19:32:27.387 I/BaseActivity: Stopping UnlockActivity
11-26 19:32:29.054 I/ConversationActivity: Eagerly loading text for latest message
11-26 19:32:29.108 I/ContactListFragment: Concurrent update, reloading
11-26 19:32:30.076 I/ContactListFragment: Conversation message received, updating item

There are some odd things about this log:

1. ConversationActivity and UnlockActivity seem to be started while the screen is off. I'm guessing this isn't really the case, it's just that the SCREEN_ON broadcast was received a while after the screen was actually turned on.
2. ConversationActivity is stopped at 19:32:25 and not subsequently started. But at 19:32:29 it eagerly loads the text for a new message.
   • It shouldn't be doing any work while stopped.
   • If we show the contact list after unlocking then we should clear the stack down to the existing instance of NavDrawerActivity, if any, which should destroy any existing instance of ConversationActivity.
3. A message arrives while ContactListFragment is loading the contact list, which presumably started at 19:32:26 when NavDrawerActivity was started. This causes ContactListFragment to reload the contact list. It's not clear whether the reload has completed before we try to update the item, triggering the crash.