I have framelayout in activity and two fragments that I need to attach to the activity depending on the user's choise. When I attach one fragment and change orientation, my fragment gest destrotroyed with activity. How to keep the state of fragment inside activity?
This is my menuActivity which has framelayout.
class MenuActivity : AppCompatActivity(), OptionsFragment.PassFragment {
private val TAG = "Menu"
private lateinit var binding: ActivityMenuBinding
private lateinit var informationViewModel: InformationViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMenuBinding.inflate(layoutInflater)
setContentView(binding.root)
informationViewModel = ViewModelProvider(this).get(InformationViewModel::class.java)
Log.i(TAG, "onCreate: code: ${informationViewModel.hashCode()}")
if (informationViewModel.fragment != null) {
showFragment(informationViewModel.fragment!!)
} else {
showFragment(OptionsFragment())
}
}
private fun showFragment(fragment: Fragment) {
supportFragmentManager.beginTransaction().replace(R.id.container, fragment)
.commit()
}
override fun onPassFragment(fragment: Fragment) {
informationViewModel.fragment = fragment
}
}
This is my first fragment which should appear first in activity and it has two textviews for two fragments.
class OptionsFragment : Fragment(R.layout.options_fragment) {
private lateinit var txtPersonal: TextView
private lateinit var txtSecond: TextView
private lateinit var informationViewModel: InformationViewModel
private lateinit var passFragment: PassFragment
private val TAG = "OptionsFragment"
interface PassFragment {
fun onPassFragment(fragment: Fragment)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
txtPersonal = view.findViewById(R.id.person_det)
txtSecond = view.findViewById(R.id.trading_currency)
informationViewModel = ViewModelProvider(this).get(InformationViewModel::class.java)
Log.i(TAG, "onViewCreated: code: ${informationViewModel.hashCode()} ")
txtPersonal.setOnClickListener {
passFragment(PersonalInfFragment())
requireActivity().supportFragmentManager.beginTransaction()
.replace(R.id.container, PersonalInfFragment()).commit()
}
txtSecond.setOnClickListener {
passFragment(TradingFragment())
requireActivity().supportFragmentManager.beginTransaction()
.replace(R.id.container, TradingFragment()).commit()
}
}
private fun passFragment(fragment: Fragment) {
try {
passFragment = activity as PassFragment
passFragment.onPassFragment(fragment)
} catch (ex: ClassCastException) {
}
}
}
Let's say from above options fragment, I opened my second TradingFragment and showed some information from retrofit using the same viewmodel.
class TradingFragment : Fragment(R.layout.currency_trading) {
private val TAG = "TradingFragment"
private lateinit var informationViewModel: InformationViewModel
private lateinit var rec_view: RecyclerView
private lateinit var btnSearch: Button
private lateinit var adapter: TradingAdapter
private lateinit var rangeSeek: RangeSlider
private lateinit var txtStartDate: TextView
private lateinit var txtFinishData: TextView
private lateinit var spinner: Spinner
private var from = 0
private var to = 0
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
btnSearch = view.findViewById(R.id.btnSearch)
rec_view = view.findViewById(R.id.rec_view)
rangeSeek = view.findViewById(R.id.rangeSlider)
txtStartDate = view.findViewById(R.id.txtFrom)
txtFinishData = view.findViewById(R.id.txtTo)
spinner = view.findViewById(R.id.spinner)
informationViewModel = ViewModelProvider(this).get(InformationViewModel::class.java)
val cur_time = "${System.currentTimeMillis()}".substring(0, 10)
rangeSeek.valueTo = Integer.valueOf(cur_time) * 1.0f
initRecyclerView()
rangeSeek.addOnSliderTouchListener(object : RangeSlider.OnSliderTouchListener {
override fun onStartTrackingTouch(slider: RangeSlider) {
}
override fun onStopTrackingTouch(slider: RangeSlider) {
changeDateValueForText(slider.values.get(0).toInt(), slider.values.get(1).toInt())
}
})
btnSearch.setOnClickListener {
startSearchingCurrencyTrading()
}
}
private fun startSearchingCurrencyTrading() {
val pair = spinner.selectedItem.toString()
informationViewModel.startRequestingCurrency(pair, from, to)
}
private fun changeDateValueForText(start: Int, finish: Int) {
from = start
to = finish
val startDate = Date(start * 1000L)
val finishDate = Date(finish * 1000L)
val df = SimpleDateFormat("dd:MM:yyyy")
txtStartDate.text = df.format(startDate)
txtFinishData.text = df.format(finishDate)
}
private fun initRecyclerView() {
adapter = TradingAdapter()
rec_view.adapter = adapter
rec_view.layoutManager = LinearLayoutManager(requireActivity())
informationViewModel.returnCurrentTrading().observe(this) {
if (it != null) {
adapter.updateTradingItems(it)
} else {
adapter.updateTradingItems(listOf())
}
}
}
}
This is my current solution it worked, but I lost my previous query result to retrofit that was being showed on the tradingfragment before orientation change.
