android-lifecycle

来源： https://stackoverflow.com/questions/44280511/failed-to-resolve-android-arch-lifecycleextensions1-0-0-alpha1-android-studio

来源： https://stackoverflow.com/questions/55883370/let-every-observer-only-receive-new-livedata-upon-subscribing-observing

问题 Google deprecate fragment’s onActivityCreated() on Android and recommend to use LifeCycleObserver: To get a callback specifically when a Fragment activity's * {@link Activity#onCreate(Bundle)} is called, register a * {@link androidx.lifecycle.LifecycleObserver} on the Activity's * {@link Lifecycle} in {@link #onAttach(Context)}, removing it when it receives the * {@link Lifecycle.State#CREATED} callback. So I try to make it in recommended way, but only state I can observe in Logcat is just

问题 I am using Picasso for handling image loading in my app. In my Activity I do @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.loading_screen); setupPicasso(); // ... } private void setupPicasso() { Cache diskCache = new Cache(getDir(CacheConstants.DISK_CACHE_DIRECTORY, Context.MODE_PRIVATE), CacheConstants.DISK_CACHE_SIZE); OkHttpClient okHttpClient = new OkHttpClient(); okHttpClient.setCache(diskCache); Picasso picasso

问题 I am trying to (at least partially) determine when an application gets closed by the user to release some connections, etc. To do this, I am using the ProcessLifecycleOwner with my application class implementing LifecycleObserver . Despite taking the starting code from tutorials and other helpful articles, it does not seem to detect any lifecycle events. Most of the code came from this example. My application class: public class App extends Application implements LifecycleObserver { @Override

问题 I register receiver in onResume() and unregister it in onPause() method. I can strange error in my Crashlytics reports: Fatal Exception: java.lang.RuntimeException Unable to pause activity {package-here}: java.lang.IllegalArgumentException: Receiver not registered: Caused by java.lang.IllegalArgumentException Receiver not registered: It happened 3 times (3 users) on 20k installs. Is it possible that onPause() gets called if onResume() hasn't been called before? I thought it isn't. 回答1: If it

问题 I register receiver in onResume() and unregister it in onPause() method. I can strange error in my Crashlytics reports: Fatal Exception: java.lang.RuntimeException Unable to pause activity {package-here}: java.lang.IllegalArgumentException: Receiver not registered: Caused by java.lang.IllegalArgumentException Receiver not registered: It happened 3 times (3 users) on 20k installs. Is it possible that onPause() gets called if onResume() hasn't been called before? I thought it isn't. 回答1: If it

问题 I'm currently refactoring my code to include ViewModel with LiveData provided by android.arch library. I have a simple activity that sends request for a password change to server and acts according to HTTP response code. For that purpose I have created class that extends ViewModel for data and a repository class to call server. My ViewModel class has one MutableLiveData field which I'm subscribing to from my activity using .observe(...) method. The issue is that code inside .observe(...)

问题 I'm currently refactoring my code to include ViewModel with LiveData provided by android.arch library. I have a simple activity that sends request for a password change to server and acts according to HTTP response code. For that purpose I have created class that extends ViewModel for data and a repository class to call server. My ViewModel class has one MutableLiveData field which I'm subscribing to from my activity using .observe(...) method. The issue is that code inside .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