Click-Ereignisse in RecyclerView

Listenelemente anklickbar machen

Adapter mit Click-Callback

class FruitAdapter(
    private val fruits: List<Fruit>,
    private val onItemClick: (Fruit) -> Unit
) : RecyclerView.Adapter<FruitAdapter.ViewHolder>() {

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val tvName: TextView = view.findViewById(R.id.tvName)
        val tvCalories: TextView = view.findViewById(R.id.tvCalories)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.item_fruit, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val fruit = fruits[position]
        holder.tvName.text = fruit.name
        holder.tvCalories.text = "${fruit.calories} kcal"
        // Set click listener on the whole item
        holder.itemView.setOnClickListener {
            onItemClick(fruit)
        }
    }

    override fun getItemCount() = fruits.size
}

Klicks in der Activity verarbeiten

val adapter = FruitAdapter(fruits) { fruit ->
    // Called when user taps a fruit
    val intent = Intent(this, FruitDetailActivity::class.java)
    intent.putExtra("FRUIT_NAME", fruit.name)
    intent.putExtra("FRUIT_CALORIES", fruit.calories)
    startActivity(intent)
}

binding.recyclerView.apply {
    this.adapter = adapter
    layoutManager = LinearLayoutManager(this@MainActivity)
}

Daten im Detailbildschirm empfangen

class FruitDetailActivity : AppCompatActivity() {

    private lateinit var binding: ActivityFruitDetailBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityFruitDetailBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val name = intent.getStringExtra("FRUIT_NAME") ?: "Unknown"
        val calories = intent.getIntExtra("FRUIT_CALORIES", 0)

        binding.tvDetailName.text = name
        binding.tvDetailCalories.text = "$calories kcal"
    }
}

Effiziente Aktualisierungen mit DiffUtil

ListAdapter mit DiffUtil

class FruitAdapter(
    private val onItemClick: (Fruit) -> Unit
) : ListAdapter<Fruit, FruitAdapter.ViewHolder>(DIFF_CALLBACK) {

    companion object {
        val DIFF_CALLBACK = object : DiffUtil.ItemCallback<Fruit>() {
            override fun areItemsTheSame(old: Fruit, new: Fruit) =
                old.name == new.name
            override fun areContentsTheSame(old: Fruit, new: Fruit) =
                old == new  // data class equals()
        }
    }

    // ... ViewHolder and onCreateViewHolder same as before ...

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val fruit = getItem(position)  // use getItem(), not fruits[position]
        holder.tvName.text = fruit.name
        holder.itemView.setOnClickListener { onItemClick(fruit) }
    }
}

Neue Listen übermitteln

// In Activity:
val adapter = FruitAdapter { fruit ->
    // handle click
}
binding.recyclerView.adapter = adapter

// Initial data
adapter.submitList(fruits)

// Later, update with new data (e.g. after filtering):
val filtered = fruits.filter { it.calories < 100 }
adapter.submitList(filtered)  // DiffUtil animates the change

Langer Druck und Kontextmenüs

Elementdekorationen hinzufügen

binding.recyclerView.apply {
    adapter = fruitAdapter
    layoutManager = LinearLayoutManager(this@MainActivity)
    addItemDecoration(
        DividerItemDecoration(
            this@MainActivity,
            DividerItemDecoration.VERTICAL
        )
    )
}

Kurze Überprüfung

Zusammenfassung: RecyclerView-Klicks