CODEWITHSUNDEEP
androidandroid-intentkotlinandroid-jetpack
Joe
Joe

Reputation: 3961

Using intent to pass data with Android jetpack navigation graph

I have finished implementing this new Android jetpack navigation graph into a project. I have a ListView that has a detailed view, defined in the nav graph.

The transitions to & from from view to view with this nav graph work great, however, I am stuck now trying to pass a data object from the ListView (View A, comprised of Winter objects) to the detailed view (View B). Before using Jetpack, this was quite simple with intents and startActivity()

Winter object:

class Winter(sportName:String, sportType: SportType, sportEquipment:ArrayList<Equipment> ) {

    var sportName = ""
    var sportType = WinterModel.SportType.board
    var sportEquipment = arrayListOf<Equipment>()

    enum class SportType(val type: String){
        board("Board"),
        ski("Ski"),
        engine("Engine")
    }

    init {
        this.sportName = sportName
        this.sportType = sportType
        this.sportEquipment = sportEquipment
    }

}

I would like to be able to do something like:

val tappedSport = winterSport[position]
val bundle = Bundle()
bundle.putString(SPORT, tappedSport)
Navigation.findNavController(view!!).navigate(R.id.winterSportDetails,bundle)

Obviously that won't work, because winterSport[position] is not a string...

How can I pass the tapped Winter object to View B using jetpack navigation?

Edit: Here's how I would have done it with intents.

View A (Sending)

listView.setOnItemClickListener { _, _, position, _ ->

    val tappedSport = winterSport[position]

    val detailIntent = DetailActivity.newIntent(context, tappedSport)

    startActivity(detailIntent)
}

View B (Receiving)

companion object {

    const val SPORT_NAME = "SPORT_NAME"
    const val SPORT_TYPE = "SPORT_TYPE"
    const val SPORT_EQUIPMENT = "SPORT_EQUIPMENT"

    fun newIntent(context: Context, sport: WinterModel): Intent {
        val detailIntent = Intent(context, DetailActivity::class.java)

        detailIntent.putExtra(SPORT_NAME, sport.sportName)
        detailIntent.putExtra(SPORT_TYPE, sport.sportType.type)
        detailIntent.putExtra(SPORT_EQUIPMENT, sport.sportEquipment.gear)

        return detailIntent
    }
}

//.. Then just access the info in onViewCreated

Upvotes: 1

Views: 1518

Answers (1)

ianhanniballake
ianhanniballake

Reputation: 199805

The Extras of an Intent are stored in a Bundle. For every type that is acceptable in putExtra() there is an equivalent method on Bundle that accepts that same type.

For example, for a String, you'd use putString. Enum types are Serializable, so you'd use putSerializable. Similarly for every other type.

Upvotes: 3

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