How do you check if a ListView contains a specified header?

android, listview

Solution

If by 'header' you mean an actual header added using either of the `addHeaderView(...)` methods, you can simply retrieve the number of added headers using `getHeaderViewsCount()`.

Alternatively, if I remember correctly, `ListView` will wrap its adapter inside a `HeaderViewListAdapter` if it contains headers and/or footers. You can use its `getHeadersCount()` to retrieve the same number as above.

Edit: If you want to check whether a specific header is added, you should be able to query the `HeaderViewListAdapter` for that. You will need some sort of criteria to check against.

For example, if there are 3 headers in your `ListView`, you can iterate over the first three items (you can probably grab them either directly from the `HeaderListViewAdapter`, or use the `ListView`'s `getItemAtPosition(...)` method) and see if one matches the criteria. The easiest way to do this 'matching' is probably to add headers using the `addHeaderView(...)` method that also takes an `Object` parameter. You can supply basically anything to differentiate between the multiple headers, obviously provided that the data objects are different. E.g. you could just pass in a String.

With this data in place, you can call `getItem(...)`/`getItemAtPosition(...)` for the first 3 positions and check what gets returned. The benefit of using a String for data is that every Java object implements a `toString()` method, which you can then exploit for a straightforward `.equals(..)` comparison.

Alternatively, you could use reflection to get ahold of the actual `mHeaderViewInfos` member variable (which is just an `ArrayList<ListView.FixedViewInfo>`) and use that for the conditional logic.

Problem

Original source