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StateAwareViewModel.kt
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import android.app.Application | |
import android.os.Bundle | |
import androidx.fragment.app.Fragment | |
import androidx.fragment.app.FragmentActivity | |
import androidx.lifecycle.AndroidViewModel | |
import androidx.lifecycle.ViewModel | |
import androidx.lifecycle.ViewModelProvider | |
import androidx.lifecycle.ViewModelProviders | |
fun <T : StateAwareViewModel> FragmentActivity.getStateAwareViewModel( | |
modelClass: Class<T>, | |
savedInstanceState: Bundle? | |
) = getStateAwareViewModel(modelClass, StateAwareViewModel.Factory(application, savedInstanceState)) | |
fun <T : StateAwareViewModel> FragmentActivity.getStateAwareViewModel( | |
modelClass: Class<T>, | |
factory: StateAwareViewModel.Factory | |
) = ViewModelProviders.of(this, factory).get(modelClass) | |
fun <T : StateAwareViewModel> Fragment.getStateAwareViewModel( | |
modelClass: Class<T>, | |
savedInstanceState: Bundle? | |
) = getStateAwareViewModel(modelClass, StateAwareViewModel.Factory(requireActivity().application, savedInstanceState)) | |
fun <T : StateAwareViewModel> Fragment.getStateAwareViewModel( | |
modelClass: Class<T>, | |
factory: StateAwareViewModel.Factory | |
) = ViewModelProviders.of(this, factory).get(modelClass) | |
abstract class StateAwareViewModel(application: Application) : AndroidViewModel(application) { | |
abstract fun saveInstanceState(outState: Bundle) | |
abstract fun restoreInstanceState(state: Bundle?) | |
open class Factory( | |
private val application: Application, | |
private val savedInstanceState: Bundle? | |
) : ViewModelProvider.NewInstanceFactory() { | |
final override fun <T : ViewModel> create(modelClass: Class<T>): T = createBase(modelClass) | |
.also { (it as StateAwareViewModel).restoreInstanceState(savedInstanceState) } | |
open fun <T : ViewModel> createBase(modelClass: Class<T>): T = modelClass | |
.getConstructor(Application::class.java) | |
.newInstance(application) | |
} | |
} |
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