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G.day everyone. Welcome back.
Our onClickListeners  are working,

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but they're not doing anything useful. We want them to notify the fragment or activity that the buttons were tapped.

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The way we'll do that is to define an interface in the adapter.

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MainActivityFragment will implement the functions in the interface,

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and we can be sure that it contains the functions that we're going to call.

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Let's declare an interface, and add our methods.

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We'll add one for onClickEdit, one for
clicking the delete button, and one for a long click.

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Now that we've defined the interface, we can pass in a reference to something that implements that interface,

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so that the adapter knows what to call.

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I'll add that to the primary constructor.

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Okay, we've got a listener property and
we can pass a reference to it, to our ViewHolder.

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The ViewHolder will then call the appropriate functions on the listener,

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and it will do that in its onClick functions.

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So let's add in the code we need.
First of all we we'll need to pass a listener into our bind function.

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Then we can replace the boilerplate that we put in earlier,
with the code that we actually want to use.

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We've now got an error in the onBindViewHolder function,

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and that's because bind is expecting an extra argument.
We need to pass in the listener,

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and that's the changes to the adapter finished.

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When one of the buttons is tapped, the onClick function will
call the corresponding function of our listener -

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the MainActivityFragment, in this case.

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The same happens if an item in the RecyclerView is long tapped.

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MainActivityFragment's onTaskLongClick function will be called.

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Before we finish this video, let's tidy up some logging.

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We know our adapter's working with the RecyclerView,

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so there's no need to log the onBindViewHolder
and getItemCount functions.

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In the next video, we'll get MainActivityFragment to implement the interface
and we'll add the required functions to it.

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See you in the next one