How to update Android fragment from activity?

Question

I want to periodically update a fragment\'s display based on data I download from the Internet. I have created a Timer and Runnable to periodically retrieve this data as w

Answer 1

You cannot give your fragments a tag or id but you can create a custom property on your fragment class to mark them.

switch (position)
    {
    case FRAG1_POS:
        Fragment1 f = Fragment1.newInstance();
        f.fragmentType = 1;
        return f;

    case FRAG2_POS:
        Fragment1 f = Fragment1.newInstance();
        f.fragmentType = 2;
        return f;

    default:
        return null;
    }

When can then loop through all the fragments and find the one you need

List allFragments = getSupportFragmentManager().getFragments();
if (allFragments != null) {
    for (Fragment fragment : allFragments) {
        Fragment1 f1 = (Fragment1)fragment;
        if (f1.fragmentType == 1)
            f1.updateFragmentData();
    }
}
}

Add a public method to your fragment that will update the data in your fragment. As you have a reference to it now, you can just call it from your activity.