Android app not responding (ANR)

Question

I have an android app, which listens to a socket from the server and retrieves data in json format and save data in the database. Resource cursor adapter is used to display the data in a list. When the app is idle for 10 minutes or more, it is not reponding. Any solutions?

where is your code and logcat??? – M D Apr 01 '15 at 09:40 — M D, Apr 01 '15 at 09:40
i edited question to attach the log. – Jyothish Apr 01 '15 at 09:52 — Jyothish, Apr 01 '15 at 09:52
information inaccuracy and miscellaneous. – SilentKnight Apr 01 '15 at 09:56 — SilentKnight, Apr 01 '15 at 09:56

score 16 · Answer 1 · answered Apr 01 '15 at 09:53

16

ANR occurs when the main thread is blocked for a few time. Specifically, 5 seconds in an Activity, 10 seconds in a BroadcastReceiver and 20 seconds in a Service. So, to avoid ANR, you need to ensure that you don't do something like these in you UI thread: reading or writing files, connecting the internet, operating databases and so on, which spend a lot of time. So, if you want to do things above, you may start a new thread to do that. Specifically, AsyncTask ThreadHandler and something like that.

I hope this will help you.

answered Apr 01 '15 at 09:53

SilentKnight

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Hi, I remember reading something similar in the Android documentation, but I can not find it anymore, can you please send me the link? – dmarin Jul 11 '17 at 06:46
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@dmarin Link is here: https://developer.android.com/training/articles/perf-anr.html – SilentKnight Jul 12 '17 at 02:34
Thanks, but it does not longer mention the 20 seconds for the service – dmarin Jul 12 '17 at 07:00
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@dmarin if you look up in source codes, you would see `// How long we wait for a service to finish executing. static final int SERVICE_TIMEOUT = 20*1000; // How long we wait for a service to finish executing. static final int SERVICE_BACKGROUND_TIMEOUT = SERVICE_TIMEOUT * 10;` in line 90~94. And in line 1783~1791 of `ActivityManagerService`, you would see `mHandler.sendMessageDelayed(nmsg, ActiveServices.SERVICE_TIMEOUT);` – SilentKnight Jul 12 '17 at 12:16

Yauraw Gadav · Answer 2 · 2015-04-01T10:06:41.983

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ANR occurs when Android detects the system is unable to respond to user input for more than a few seconds.

CursorWindow﹕ Window is full: requested allocation 396488 bytes,
free space 285853 bytes, window size 2097152 bytes
04-01 05:32:34.328    1598-1607/com.inxed W/CursorWrapperInner﹕ 
Cursor finalized without prior close()

you need to close the cursor.

edited Apr 01 '15 at 10:06

answered Apr 01 '15 at 09:48

Yauraw Gadav

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on the on resume of main activity I call two async tasks back to back – Jyothish Apr 01 '15 at 09:53

Dilip · Answer 3 · 2015-04-01T09:49:40.090

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ANR display if application cannot respond to the user input.According to the Google doc,you should not perform the work on the UI thread. I recommend you to perform network request or long running operation in worker thread instead of UI thread. for more this

edited Apr 01 '15 at 09:49

answered Apr 01 '15 at 09:44

Dilip

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score 0 · Answer 4 · edited May 23 '17 at 12:18

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It looks like your DB cursor its full. After saving data from the cursor, close it, set it to null and create a new one so no buffers are kept in memory.

this SO answer gives more information

edited May 23 '17 at 12:18

Community

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answered Apr 01 '15 at 09:59

Diego Freniche

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Android app not responding (ANR)

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