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October 4, 2025 09:16
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| class MainActivity : AppCompatActivity() { | |
| private val users = mutableListOf<User>() | |
| private lateinit var adapter: UserAdapter | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContentView(R.layout.activity_main) | |
| val recyclerView = findViewById<RecyclerView>(R.id.recyclerView) | |
| adapter = UserAdapter(users) | |
| recyclerView.adapter = adapter | |
| recyclerView.layoutManager = LinearLayoutManager(this) | |
| loadUsers() | |
| } | |
| private fun loadUsers() { | |
| lifecycleScope.launch(Dispatchers.IO) { | |
| try { | |
| val url = URL("https://api.example.com/users") | |
| val json = url.readText() | |
| val jsonArray = JSONArray(json) | |
| val fetchedUsers = | |
| (0 until jsonArray.length()).map { i -> | |
| jsonArray.getJSONObject(i).let { | |
| User(it.getInt("id"), it.getString("name"), it.getString("email")) | |
| } | |
| } | |
| withContext(Dispatchers.Main) { | |
| users.clear() | |
| users.addAll(fetchedUsers) | |
| adapter.notifyDataSetChanged() | |
| } | |
| } catch (e: Exception) { | |
| withContext(Dispatchers.Main) { | |
| Toast | |
| .makeText(this@MainActivity, "Error: ${e.message}", Toast.LENGTH_SHORT) | |
| .show() | |
| } | |
| } | |
| } | |
| } | |
| data class User( | |
| val id: Int, | |
| val name: String, | |
| val email: String, | |
| ) | |
| inner class UserAdapter( | |
| private val items: List<User>, | |
| ) : RecyclerView.Adapter<ViewHolder>() { | |
| override fun onCreateViewHolder( | |
| parent: ViewGroup, | |
| viewType: Int, | |
| ) = ViewHolder( | |
| LayoutInflater.from(parent.context).inflate(R.layout.item_user, parent, false), | |
| ) | |
| override fun onBindViewHolder( | |
| holder: ViewHolder, | |
| position: Int, | |
| ) { | |
| holder.name.text = items[position].name | |
| holder.email.text = items[position].email | |
| } | |
| override fun getItemCount() = items.size | |
| } | |
| class ViewHolder( | |
| view: View, | |
| ) : RecyclerView.ViewHolder(view) { | |
| val name: TextView = view.findViewById(R.id.tvName) | |
| val email: TextView = view.findViewById(R.id.tvEmail) | |
| } | |
| } |
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