Activity Fragment data 공유 ViewModel

ViewModel을 통해 액티비티와 프래그먼트의 데이터를 공유하는 방법입니다.

 

 

	class MainActivity : AppCompatActivity() {
	private lateinit var viewModel: MainActivityViewModel
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_main)
	viewModel = ViewModelProvider(this).get(MainActivityViewModel::class.java)
	}
	}

view raw MainActivity.kt hosted with ❤ by GitHub

	class MainActivityViewModel : ViewModel() {
	private var count = 0
	init {
	Log.e("Start", "MainActivityViewModel")
	}
	fun getCurrentCount():Int{
	return count
	}
	fun getUpdatedCount():Int{
	return ++count
	}
	}

view raw MainActivityViewModel.kt hosted with ❤ by GitHub

	class BlankFragment1 : Fragment() {
	// TODO: Rename and change types of parameters
	private var param1: String? = null
	private var param2: String? = null
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	arguments?.let {
	param1 = it.getString(ARG_PARAM1)
	param2 = it.getString(ARG_PARAM2)
	}
	}
	private val TAG = BlankFragment1::class.java.simpleName
	private lateinit var binding : FragmentBlank1Binding
	private lateinit var viewModel: MainActivityViewModel
	override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
	Log.e(TAG, "onCreateView")
	binding = DataBindingUtil.inflate(inflater, R.layout.fragment_blank1, container, false)
	binding.button.setOnClickListener {
	it.findNavController().navigate(R.id.action_blankFragment1_to_blankFragment2)
	}
	viewModel = ViewModelProvider(activity as MainActivity)[MainActivityViewModel::class.java]
	binding.textView2.text = viewModel.getCurrentCount().toString()
	binding.button2.setOnClickListener {
	binding.textView2.text = viewModel.getUpdatedCount().toString()
	}
	return binding.root
	}
	companion object {
	/**
	* Use this factory method to create a new instance of
	* this fragment using the provided parameters.
	*
	* @param param1 Parameter 1.
	* @param param2 Parameter 2.
	* @return A new instance of fragment BlankFragment1.
	*/
	// TODO: Rename and change types and number of parameters
	@JvmStatic
	fun newInstance(param1: String, param2: String) =
	BlankFragment1().apply {
	arguments = Bundle().apply {
	putString(ARG_PARAM1, param1)
	putString(ARG_PARAM2, param2)
	}
	}
	}
	}

view raw BlankFragment1.kt hosted with ❤ by GitHub

	class BlankFragment2 : Fragment() {
	// TODO: Rename and change types of parameters
	private var param1: String? = null
	private var param2: String? = null
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	arguments?.let {
	param1 = it.getString(ARG_PARAM1)
	param2 = it.getString(ARG_PARAM2)
	}
	}
	private val TAG = BlankFragment2::class.java.simpleName
	private lateinit var binding : FragmentBlank2Binding
	private lateinit var viewModel: MainActivityViewModel
	override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
	Log.e(TAG, "onCreateView")
	binding = DataBindingUtil.inflate(inflater, R.layout.fragment_blank2, container, false)
	binding.button3.setOnClickListener {
	it.findNavController().navigate(R.id.action_blankFragment2_to_blankFragment1)
	}
	viewModel = ViewModelProvider(activity as MainActivity)[MainActivityViewModel::class.java]
	binding.button3.text = viewModel.getCurrentCount().toString()
	return binding.root
	}
	companion object {
	/**
	* Use this factory method to create a new instance of
	* this fragment using the provided parameters.
	*
	* @param param1 Parameter 1.
	* @param param2 Parameter 2.
	* @return A new instance of fragment BlankFragment2.
	*/
	// TODO: Rename and change types and number of parameters
	@JvmStatic
	fun newInstance(param1: String, param2: String) =
	BlankFragment2().apply {
	arguments = Bundle().apply {
	putString(ARG_PARAM1, param1)
	putString(ARG_PARAM2, param2)
	}
	}
	}
	}

view raw BlankFragment2.kt hosted with ❤ by GitHub