Mastering Android Kotlin: Junior vs Mid vs Senior — Practical Code Examples

Loading Data in a Fragment Scenario: Load and display user data from a ViewModel. lifecycleScope.launchWhenStarted { viewModel.userData .filterNotNull() .collect { user -> textView.text = user.name } } Making a Network Request with Retrofit Scenario: Fetch user data from an API using Retrofit lifecycleScope.launch { runCatching { api.getUser() } .onSuccess { user -> textView.text = user.name } .onFailure { error -> // Handle error } } Handling Button Clicks Scenario: Respond to a button click event. button.setOnClickListener { context?.let { Toast.makeText(it, "Clicked", Toast.LENGTH_SHORT).show() } } Navigating Between Fragments Scenario: Navigate from one fragment to another using Navigation Component. val action = FirstFragmentDirections.actionFirstFragmentToSecondFragment() findNavController().navigate(action) Displaying a List with RecyclerView Scenario: Display a list of items using RecyclerView. val adapter = MyAdapter().apply { submitList(items) } recyclerView.adapter = adapter

May 13, 2025 - 19:16

Mastering Android Kotlin: Junior vs Mid vs Senior — Practical Code Examples

Loading Data in a Fragment Scenario: Load and display user data from a ViewModel.

  lifecycleScope.launchWhenStarted {
      viewModel.userData
          .filterNotNull()
          .collect { user ->
              textView.text = user.name
          }
  }

Making a Network Request with Retrofit Scenario: Fetch user data from an API using Retrofit

  lifecycleScope.launch {
      runCatching { api.getUser() }
          .onSuccess { user ->
              textView.text = user.name
          }
          .onFailure { error ->
              // Handle error
          }
  }

Handling Button Clicks Scenario: Respond to a button click event.

  button.setOnClickListener {
      context?.let {
          Toast.makeText(it, "Clicked", Toast.LENGTH_SHORT).show()
      }
  }

Navigating Between Fragments Scenario: Navigate from one fragment to another using Navigation Component.

  val action = FirstFragmentDirections.actionFirstFragmentToSecondFragment()
  findNavController().navigate(action)

Displaying a List with RecyclerView Scenario: Display a list of items using RecyclerView.

  val adapter = MyAdapter().apply {
      submitList(items)
  }
  recyclerView.adapter = adapter