Please can anyone explan this exception in LogCat

Question

06-28 12:07:10.881: E/(930): {total=21 secs, date2=28-06-2012, time2=9:43:09 AM, time1=9:42:48 AM, date1=28-06-2012}
06-28 12:07:11.131: E/testing(930): exception:android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
06-28 12:07:11.160: E/(930): {total=24 secs, date2=28-06-2012, time2=10:45:02 AM, time1=10:44:38 AM, date1=28-06-2012}
06-28 12:07:11.601: E/testing(930): exception:java.lang.IllegalArgumentException: The observer is null.

you are trying to update the UI element from non UI thread... — Dheeresh Singh, Jun 28 '12 at 06:40
make sure you are not calling it from a new Thread or AsyncTask.. see this http://stackoverflow.com/questions/5185015/updating-android-ui-using-threads — ngesh, Jun 28 '12 at 06:41

score 2 · Accepted Answer · answered Jun 28 '12 at 06:41

2

.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views

looks you are trying to update the UI element from non UI thread.

should use Handler or runOuUIThread function of activities or Asynctask as per your need

answered Jun 28 '12 at 06:41

Dheeresh Singh

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sure http://www.aviyehuda.com/2010/12/android-multithreading-in-a-ui-environment/ – Dheeresh Singh Jun 28 '12 at 08:35

score 1 · Answer 2 · answered Jun 28 '12 at 06:42

1

Look at code that is written in a seprate thread and is trying to update your application UI.

You need to put that code in run method of runOnUiThread.

runOnUiThread(new Runnable() {
     public void run() {
           // COde to update UI.
    }
});

answered Jun 28 '12 at 06:42

Aqif Hamid

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score 0 · Answer 3 · answered Jun 28 '12 at 06:41

0

You are attempting to modify UI components on a thread that is not the UI thread. Take a look at runOnUiThread for updating UI components from non-UI threads.

answered Jun 28 '12 at 06:41

cklab

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score 0 · Answer 4 · answered Jun 28 '12 at 06:46

You can use threads but all the views, and all the views related APIs, must be invoked from the main thread (also called UI thread.) To do this from a background thread, you need to use a Handler. A Handler is an object that will post messages back to the UI thread for you.

Please can anyone explan this exception in LogCat

4 Answers4