Android UI Thread

Question

i am using threads to do few tasks. and after that i want to access the main thread via runOnUiThread(). but how to determine whether that ui thread still running or not?

you mean if its sleeping? the ui thread is the main thread that your application starts in. — L7ColWinters, Jan 27 '12 at 06:00
no i need to know whether that activity is still running or not — Jram, Jan 27 '12 at 06:07
i think if you will access through runOnUIThread,it will work anytime. — Android Killer, Jan 27 '12 at 06:10

score 1 · Accepted Answer · edited May 23 '17 at 12:03

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Two options are there one use a static boolean variable and see whether the activity is running or not, or you can check all the running tasks and determine whether your activity is running or not.

edited May 23 '17 at 12:03

Community

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answered Jan 27 '12 at 06:18

manjusg

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how do you use the second method , meaning get running tasks and check if the activity is running? – android developer Jun 12 '12 at 21:27

score 0 · Answer 2 · answered Jan 27 '12 at 06:09

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The only instance when your UI thread is not running is when your main thread has spawned a thread which needs to communicate with the UI thread and the non-UI thread has not been killed when the life of the context ends.

You must avoid a situation like this by interrupt()ing your threads in onStop() or onDestory() (whatever is appropriate).

After you've taken care of this, you can always safely assume that a runOnUiThread() call is appropriate.

answered Jan 27 '12 at 06:09

Vikram Bodicherla

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thank you for your input. due to the nature of the task which i am performing inside the thread, i need to complete it safely ,instead of breaking in the middle. – Jram Jan 27 '12 at 07:05

Android UI Thread

2 Answers2