Intent filter extension

[IVIanuu]

What about a function like this?

fun intentFilterOf(vararg actions: String) = IntentFilter().apply { actions.forEach { addAction(it) } }

[JakeWharton]

I don't think I've ever used an IntentFilter in my life. I think we'd need to find out common usage to determine whether this was something likely to be used or whether you rarely just specify only actions.

Any ideas?

[Edward608]

I usually use IntenFilter with Boardcast receiver to observe network state changes, but I rarely need to add multiple actions to a single IntentFilter

[IVIanuu]

I also use it only for broadcasts. I think we can close this because most of the time more than one action is not needed.

[Edward608]

Recently found one use case of multiple action in one IntentFilter, which is when you need to use the WifiP2P features. Seems like this extension is kind of useful.

[JakeWharton]

Do you have an example we can look at somewhere?

[Edward608]

val receiver = WifiP2PBoardcastReceiver(...)

fun onResume() {
  super.onResume()
  val filter = IntentFilter().apply {
      addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION)
      addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION)
      addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION)
      addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION)
  }
  registerReceiver(p2pReceiver, filter)
}

I don't know if there is a better way to do this, since its the first time I use the WifiP2P feature, but according to the offical tutorial, this is how you receive infos from the system about Wifi P2P connections and infos.

[JakeWharton]

I guess my concern here is that this is only for actions and doesn't cover any of the other things you can add to a filter.

[Edward608]

Then a set of builder-like extension function could be better? For example in Anko, you can have val intent = Intent().newTask().clearTask(). Although something similar for IntentFilter could be too much extensions.

[JakeWharton]

It probably is, yes, but we could consider adding it to the support libraries. I just have never used IntentFilter so I honestly have no idea whether it's worth our time or not.