android-lifecycle

I'm trying to create an app that lets users log routes (locations/GPS). To ensure locations are logged even when the screen is off, I have created a foreground service for the location logging. I store the locations in a Room Database which is injected into my service using Dagger2 . However, this service is killed by Android which is, of course, not good. I could subscribe to low memory warnings but that doesn't solve the underlying problem of my service getting killed after ~30 minutes on a modern high-end phone running Android 8.0 I have created a minimal project with only a "Hello world"

Actually, I would say that both iOS ViewControllers and Android Activities have their lifecycle methods. For example an equivalent of ViewController.viewDidLoad() is Activity.onCreate() ? Else I still need to know the equivalent of the other : OnStart() OnRestart() OnResume() OnStop() OnDestroy() OnPause() This is a comparison between the lifecycle of Android vs iOS: Note : viewDidUnload is deprecated after iOS 6 来源： https://stackoverflow.com/questions/28969032/what-the-equivalent-of-activity-life-cycle-in-ios

Is it possible to from my application to start another (any other) application, but the new application to be displayed inside a "frame" I have created? Not generally. You cannot embed the UI of another app in your app. The primary exception to that is via app widgets, if you implement an AppWidgetHost . Is it possible to from my app to start another (any other) application but the new application to be displayed inside a frame I have created? Basically, not. When you start an application component registered within another application manifest file, a new process for this component will be

I need to make status of user offline. When I press home button onStop() is called, that's fine. When I press back button onDestroy() is invoked. But when I close the app from recent apps by swiping it, onStop() or onDestroy() isn't called. I need to know when the app is closed from recent apps to do something (e.g make user offline). Make a service : public class MyService extends Service { private DefaultBinder mBinder; private AlarmManager alarmManager ; private PendingIntent alarmIntent; private void setAlarmIntent(PendingIntent alarmIntent){ this.alarmIntent=alarmIntent; } public void

I noticed that using the shortcut Alt + Insert and selecting the builders, it tries to create a constructor with each private property (e.g. cManager and mTextView ). I remember I already created projects without it and worked correctly. The error happens when I run the application, following the full logcat and the Activity constructor: Constructor with private property: private ConnectivityManager cManager; private TextView mTextView; public SplashScreenActivity() { this.cManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE); this.mTextView = (TextView)this

I have two activities The first one gets some data from a content provider, and displays it The second activity has a button, and when clicked it should call the first activity to "refresh", in other words to reload data from the content provider This is my first activity ... @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.contactsview); // Grab data and put it onto screen getDataAndPutToUI(); } @Override public void onStart() { //Refresh data getDataAndPutToUI(); } ... And this is my second activity @Override public void