android-lifecycle

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 My ViewModelFactory : class ViewModelFactory @Inject constructor( private val viewModelMap: MutableMap<Class<out ViewModel>, ViewModelAssistedFactory<out ViewModel>>, owner: SavedStateRegistryOwner, defaultArgs: Bundle? ) : AbstractSavedStateViewModelFactory(owner, defaultArgs) { @Throws(IllegalStateException::class) @Suppress("UNCHECKED_CAST") override fun <T : ViewModel?> create(key: String, modelClass: Class<T>, handle: SavedStateHandle): T { return viewModelMap[modelClass]?.create(handle)

问题 My ViewModelFactory : class ViewModelFactory @Inject constructor( private val viewModelMap: MutableMap<Class<out ViewModel>, ViewModelAssistedFactory<out ViewModel>>, owner: SavedStateRegistryOwner, defaultArgs: Bundle? ) : AbstractSavedStateViewModelFactory(owner, defaultArgs) { @Throws(IllegalStateException::class) @Suppress("UNCHECKED_CAST") override fun <T : ViewModel?> create(key: String, modelClass: Class<T>, handle: SavedStateHandle): T { return viewModelMap[modelClass]?.create(handle)

问题 Official documentation about Activity lists out 7 life cycle methods. onPostResume() was not quoted as life cycle method. But I feel that this method is important method. During the life cycle, when an activity is visible from hidden to show state, onRestart() onStart() onResume() onPostResume() have been invoked in order. My code snippet: package ravindra.projects.my_app_1; import android.content.Intent; import android.content.IntentFilter; import android.os.PersistableBundle; import android

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 I have some problem in nested fragment in Kotlin. I have nested fragment with ViewModel. After resuming fragment from back button press all observers on viewModel LiveData triggers again although my data does not changed. First i googled and tried for define observer in filed variable and check if it is initialized then do not observer it again: lateinit var observer: Observer fun method(){ if (::observer.isInitialized) return observer = Observer{ ... } viewModel.x_live_data.observe

问题 I have just started using android development and trying to use Room library. Since yesterday I am facing this warning message w: [kapt] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: androidx.lifecycle.LifecycleProcessor (NON_INCREMENTAL), androidx.room.RoomProcessor (NON_INCREMENTAL). I have tried to research and fix but unable to avoid this error here is my grale.build file. please suggest/advice what I am doing

问题 Activity Explanation: Activity_A ... nfc activity that gets started when tag is read Activity_B ... activity to capture user signature Hi, my problem goes like that: I have Activity_A and in that activity I call Activity_B with startActivityForResult() method. I then do some work in Activity_B and close it. After that method onActivityResult() is called in my Activity_A. I handle the returned data and all is great, but Activity_A is no longer visible. If I close Activity_B with back button,

问题 I am using 1 Activity that inflates 2 fragments (2 panes) in case of sw600-land and 1 fragment case of sw600 both of the fragments implements LoaderManager.LoaderCallbacks I'm initializing loader by (in onStart ) getActivity().getSupportLoaderManager().initLoader(pm2_MAIN_LOADER_ID, null, this); then I closed the cursor in onLoadFinished (at the last line of it) giving me the error so I have tried to close it somewhere else as the answers that I found on StackOverflow as onDestroy giving the

问题 I know that a fragment's view hierarchy has to be inflated in onCreateView, but what other functionality can be in onCreateView vs. what should wait for onActivityCreated? My current implementation uses separate activities for everything, and a typical activity does most of its work in its onCreate method, including inflating the view, setting the content view, initializing the various widgets with data, setting up listeners, etc. So can this probably all be moved into onCreateView, or should