Android Fragments and Separate Threads

Question

I am using the android ViewPager : http://developer.android.com/reference/android/support/v4/view/ViewPager.html This class allows you to basically slap a bunch of Views or Fragments into a group and page through them easily. My problem occurs when I try to create a separate thread to randomly shuffle through the views. I extended a thread which would call setCurrentItem on my ViewPager which I passed in through an argument. When I did that I received this: ``` java.lang.IllegalStateException: Must be called from main thread of process ``` I figured all I would have to do to fix that would be to call a method from my activityfragment so I created changePageFromActivity to do the dirty work and called that by passing my activity to my thread. But that didn't work either. Below is the full stack trace: ``` FATAL EXCEPTION: Thread-11 java.lang.IllegalStateException: Must be called from main thread of process at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager…

Accepted Answer

A `Handler` would be an obvious choice.

```
final Runnable changeView = new Runnable()
{
    public void run() 
    {
        methodIWantHere();
        handler.postDelayed(this, timeout);
    }
};

handler.postDelayed(changeView, timeout);
```

Android Fragments and Separate Threads

Solution

Problem