lifecycle | 易学教程

Android: Under what circumstances would a Dialog appearing cause onPause() to be called?

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A snippet from the Android Activities document(scroll down to the " foreground lifetime " line) says : An activity can frequently transition in and out of the foreground—for example, onPause() is called when the device goes to sleep or when a dialog appears . I don't quite understand this. Under what circumstances should this happen? Is onPause() called only if the context of the dialog in question is different from the activity on top of which the dialog is to be displayed? EDIT: Adding code sample to illustrate my doubt in detail Going by the above-mentioned quote from document, should my

SQLite or SharedPreferences for persistent data storage?

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问题 For persistent storage of data is there any distinct advantage of using a SQLlite database over SharedPreferences or vice versa? Currently my application data is only a couple of kilobytes in size, though it could conceivably rise to ten times that size in the future. I can't find anywhere that states how much storage is available using SharedPreferences but would imagine this would be one limitation of using it? Is there any difference in speed between the two methods? I'm looking to weigh

onNewIntent() lifecycle and registered listeners

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问题 I\'m using a singleTop Activity to receive intents from a search-dialog via onNewIntent(). What I noticed is that onPause() is called before onNewIntent() , and then afterwards it calls onResume() . Visually: search dialog initiated search intent fired to activity onPause() onNewIntent() onResume() The problem is that I have listeners registered in onResume() that get removed in onPause() , but they are needed inside of the onNewIntent() call. Is there a standard way to make those listeners

Automatically log Android lifecycle events using ActivityLifecycleCallbacks?

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问题 I am trying to automatically capture and log Android lifecycle events using ActivityLifecycleCallbacks, however documentation on this matter is scarce, to say the least: public void registerActivityLifecycleCallbacks (Application.ActivityLifecycleCallbacks callback) I don\'t want to have to extend the Activity class or override the existing lifecycle methods (onCreate, onResume, etc...) I\'m looking to have a separate class listening for these events and acting accordingly. Does anyone have

android finish() method doesn't clear app from memory

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问题 I have an activity and I call the finish() method and the activity is not cleared from memory. After calling finish() , I see that the method onDestroy() is executed successfully (and I clear all my variables and stuff in there). Should it be cleared from memory or its how android works? As I understand the LifeCycle of the Activity is finished. And if it keeps the app in memory so it runs faster the 2nd time the user uses it, what kind of objects can I leave in memory to reuse? If I

What's the view build time?

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I'm pretty new to JSF and reading some of the stack-answers like this one , I faced with the concept of view build time . Consider the JSF lifecycle scheme: As you can see, there's no phase called view build time . Maybe it means the same as Restore view phase? From the JavaEE tutorial During this phase, the JavaServer Faces implementation builds the view of the page [...] BalusC The view build time is not a phase. The view build time is that moment when the physical UIViewRoot instance and all of its children is built based on the view declaration, which is usally defined in XHTML or JSP

What is the Life Cycle of an iPhone application? [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Can anyone explain what is the life cycle process of iPhone? i.e from the start to end of the application life cycle. 回答1: See also

Is there any lifecycle hook like window.onbeforeunload in Angular2?

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问题 Is there any lifecycle hook like window.onbeforeunload in Angular2? I already googled and searched on stackoverflow, but found nothing 回答1: <div (window:beforeunload)="doSomething()"></div> or @Component({ selector: 'xxx', host: {'window:beforeunload':'doSomething'} .. )} or @Component({ selector: 'xxx', .. )} class MyComponent { @HostListener('window:beforeunload') doSomething() { } } This is how to listen to global events. I don't know if the special behavior of this event is supported

Android: Under what circumstances would a Dialog appearing cause onPause() to be called?

阅读更多关于 Android: Under what circumstances would a Dialog appearing cause onPause() to be called?

问题 A snippet from the Android Activities document(scroll down to the \" foreground lifetime \" line) says : An activity can frequently transition in and out of the foreground—for example, onPause() is called when the device goes to sleep or when a dialog appears . I don\'t quite understand this. Under what circumstances should this happen? Is onPause() called only if the context of the dialog in question is different from the activity on top of which the dialog is to be displayed? EDIT: Adding

What's the view build time?

阅读更多关于 What's the view build time?

问题 I\'m pretty new to JSF and reading some of the stack-answers like this one, I faced with the concept of view build time . Consider the JSF lifecycle scheme: As you can see, there\'s no phase called view build time . Maybe it means the same as Restore view phase? From the JavaEE tutorial During this phase, the JavaServer Faces implementation builds the view of the page [...] 回答1: The view build time is not a phase. The view build time is that moment when the physical UIViewRoot instance and