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ANR Story – How to not freeze when your app is frozen | by Akash Khunt | April 2023

DALL·E picture created (a frozen world between galaxies)

On this publish, we are going to take a look at the tactic we are able to use to categorise and course of ANR, and the way it has helped us to scale back Consumer-perceived ANR extra fee 60% 🤯 by chance 😅. Since there’s numerous literature across the query of “what’s ANR and the way does it occur”, we won’t go into that element.


Step one to understanding/resolving any ANR, it is extremely essential to categorise them into whether or not it’s an ANR or not. Consumer-perceived ANR or not. This data is obtainable in Android Vitals on the Play Console. In accordance with the offered definition Thisany ANR with Enter submission timeout or Enter submission timed out (No focus window) (happens when an utility doesn’t reply to an enter occasion inside 5 seconds) will be categorised as a Consumer-aware ANR.

One of many causes to give attention to lowering Consumer-perceived ANR charges aside from a foul Consumer expertise is as a result of it’s also a essential core which implies it impacts your app discoverability on Google Play.

Enter submission timed out (No focus window) sort not in Android Vitals doc as a Consumer-perceived ANR one, however it may be confirmed by clicking See the issue within the Consumer Perceived ANR Ratio part of Android Vitals. Discuss with the next screenshot for reference.

Android Vitals overview – Consumer-perceived ANR fee
Android Vitals Incident and ANR Consumer-perceived ANR fee

In our case, the Enter Information Despatched Timed Out (No Focus Window) sort was the largest perpetrator for the Consumer-perceived ANR fee, which elevated the interval. 80% of occasions. The issue right here is that though there is no documentation on any such ANR we aren’t certain precisely what it’s. No focus window means .

The second greatest perpetrator in our general ANR is Intent broadcast sort. Whereas this isn’t user-perceived neither is it a core essential half, we additionally needed to deal with this to take away the noise it provides to the general ANR ratio. After reviewing the ANR reporting within the Play Console, we discovered that streaming intent sort ANRs principally happen within the background (greater than 99% of the instances) and most of them appear to be associated to FCM .

For the reason that Streaming ANR Sort is primarily a background sort, generic issues like doing much less work than the Most important Thread or performing I/O operations on the background thread we do to resolve a lot of the issues. Foreground ANRs do not assist as these can occur for various causes.

The reasoning behind Intentional ANR Sort Play will be understood via understanding how the Android OS allocates assets throughout app startup when the app is launched within the Foreground vs. When the appliance is launched within the foreground, the working system tries to allocate the utmost out there assets to your utility, this may be verified by testing CPU exercise (CPU will run at ~100%) on the similar time. However when your app launches within the background OS allocates very small quantity of assets which might additionally rely on whether or not your gadget is in energetic use or in sleep mode .

From the above understanding in addition to after touchdown on an important common publish revealed by the Bumble crew, we perceive that in case your app receives FCM whereas not in RAM, earlier than executing BroadcastReceiver.onReceive() your utility should execute Software.onCreate().

Armed with this information, we began profiling our Software.onCreate() and Content material Supplier execution occasions, and we discovered some SDK initializations contribute to ~65% of the time. Software.onCreate() execution time. These SDK initials have been positively wanted throughout app startup however weren’t required to take care of FCM so we ended up transferring it to Exercise.onCreate() in our Single Exercise structure we.

After we launched the refactored replace talked about above, we have been pleasantly stunned with the outcomes that confirmed up on the Play Console. We anticipated the proportion of intentional ANRs to be streamed into the general ANR fee to drop drastically (91% drop) however we have been stunned how typically the Enter Alerts Timeout (No Window) focus) additionally dropped an incredible 99% 🤯. From that, we hypothesized that one of many root causes for the Enter submission timeout (No Targeted Window) may very well be as a result of very lengthy execution time of Software.onCreate() .

You possibly can test earlier than and after screenshots of some Enter submission timed out (No focus window) And Intent broadcast ANR beneath. FYI whole periods on each are very comparable (~7% distinction).

Earlier — Enter submission timed out (No focus window) Frequency sort ANR
After – Enter submission timeout (No focus window) Frequency of sort ANR
Earlier — Intent ANR sort broadcast
After — Intent ANR sort broadcast

Hopefully this may even assist scale back the Consumer-perceived ANR on your app. 🙂

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Updated: April 21, 2023 — 1:56 am

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