Question

• I have an application which was developed and tested on Android 2.3.6 and before
  and below. It works fine.
• I Run the app on my new Micromax A110 with Android 4.0.4 and it crashes when i launch activity B from Activity A and press the back button (or Activity C/D/E from A ) with the following error log vv

01-10 18:35:44.372: E/AndroidRuntime(18378): FATAL EXCEPTION: Timer-1
01-10 18:35:44.372: E/AndroidRuntime(18378):
java.lang.IllegalStateException: Must be called from main thread of
process 01-10 18:35:44.372: E/AndroidRuntime(18378): at
android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1373)
01-10 18:35:44.372: E/AndroidRuntime(18378): at
android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:437)
01-10 18:35:44.372: E/AndroidRuntime(18378): at
android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:454)
01-10 18:35:44.372: E/AndroidRuntime(18378): at
android.app.Activity.onBackPressed(Activity.java:2134) 01-10
18:35:44.372: E/AndroidRuntime(18378): at
com.vwap.friends.MygoBack(MyDialog.java:90) 01-10 18:35:44.372:
E/AndroidRuntime(18378): at
com.vwap.friends.MyDialog$3.run(MyDialog.java:83) 01-10
18:35:44.372: E/AndroidRuntime(18378): at
java.util.Timer$TimerImpl.run(Timer.java:284)

• I am completely unaware of the concept of fragments yet (i plan to work on that asap) and it looks like the error has something to do with it.

I don’t know where to begin from. Do i start by reading about Fragments or can i quickly fix this and release my application?

Answer 1

try to Use runOnUiThread(Runnable
action).

Or

you can Also Try with Handler:

final Runnable YOURVIEW = new Runnable()
{
    public void run() 
    {
        SampleMethod(); // Put your Method What you want change
        handler.postDelayed(this, timeout);
    }
};

handler.postDelayed(changeView, timeout);