Question

I have a parent FragmentActivity with three child Tab Fragments. When a “Submit” button is pressed on the FragmentActivity, I want to sum the values of all the EditText fields in the different Tab Fragments. I think I have the right idea, using getSupportFragmentManager().findFragmentByTag(), however I’m finding that it is only returning values for the current active Fragment. I was under the assumption that I could access the inactive (or not visible) Tab Fragment’s as well:

int sum1 = getSupplyQuantities(Constants.TAB_TAG1);
int sum2 = getSupplyQuantities(Constants.TAB_TAG2);
int sum3 = getSupplyQuantities(Constants.TAB_TAG3);
int sum4 = getSupplyQuantities(Constants.TAB_TAG4);

private int getSupplyQuantities(String string) {
    Activity tab = getSupportFragmentManager().findFragmentByTag(string)
            .getActivity();

    LinearLayout linearLayout = (LinearLayout) tab
            .findViewById(R.id.get_supplies_layout);

            int sum = 0;

    for (int i = 0; i < linearLayout.getChildCount(); i++) {
        View view = linearLayout.getChildAt(i);

        QuantityTextView quantity = (QuantityTextView) view
                .findViewById(R.id.get_supplies_list_quantity);

        sum += Integer.parseInt(quantity.getText().toString());

    }

    return sum;

}

In the above scenario, sum1, sum2, sum3, and sum4 will all be the same. They will be the sum for the active Tab Fragment.

Does anyone have any ideas?

Thanks!

Answer 1

As Barak mentioned above, you need to get a hold of the fragment(s) that contain the view(s). Keep in mind that if you use some kind of a view pager, depending on how it’s configured, only the currently visible page/fragment is instantiated.

Solutions:

1. You can keep track of the fragments or containing views in a cache if you don’t have many fragments.
2. Use the ViewHolder pattern to “cache” the relevant data that you need to access.