lifecycle

问题 It's important to my app, becuase I want to store app UDID there, and Apple recommends to create app specific UDID starting from iOS 5.0. 回答1: User defaults are persisted through updates but are not persisted through deleting and re-installing the app. At present, the keychain is persisted through deleting and re-installing the app, but it's not documented to be one way or the other, so relying on this behavior may be risky. You could also write the value to the iCloud key/value store. That

问题 I'm having a strange problem with my app - A have a Fragment Activity which contains a fragment - This fragment starts an AsyncTask onCreate() and cancels the AsyncTask onStop(). My problem arises because, although my Fragment stays running & isn't obscured it's onStop() is called almost directly after it's onCreate(). Does anyone know how to trace why this would be happening? 09-28 11:41:56.785: VERBOSE/SearchFragment1(924): onCreate() 09-28 11:41:56.796: VERBOSE/SearchFragment1(924): onStop

问题 If changing the orientation of my phone or the emulator I get the following output in LogCat: 04-09 11:55:26.290: INFO/WindowManager(52): Setting rotation to 1, animFlags=0 04-09 11:55:26.300: INFO/ActivityManager(52): Config changed: { scale=1.0 imsi=310/260 loc=en_US touch=3 keys=2/1/1 nav=3/1 orien=2 layout=18} 04-09 11:55:26.460: INFO/UsageStats(52): Unexpected resume of client while already resumed in client 04-09 11:55:26.579: INFO/SearchPosition(807): Activity is paused 04-09 11:55:26

问题 This question already has answers here : UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor? (4 answers) Closed 6 years ago . How can I compare viewDidLoad and viewDidAppear: 回答1: The best thing to do is to implement both methods in a view controller that loads a view with subviews (easiest is from a NIB) and put a breakpoint into each method. When the app stops on each breakpoint, look at the Variables view in the debugger and see what objects have been

问题 As far as I can read, Android may kill my process at any time 1. One might interpret the article [1] such that, at any point, a process must be able to survive a crash. How is that handled? Are there any guarantees of any methods being called if a process is killed this way? The article* doesn't mention it. My question is, how do you guarantee that a force-killed process resumes in some sane way on next start? The only state my process has (assuming no guarantees are made for methods being

问题 Some days ago I have published my application in Android Marketplace and a question came into my mind during designing and developing application. This question is about limitation or unlimitation of number of activities. For example, my application includes 37 activities. Is it so much? I want to know for a game such as "Angry Birds" which has more than 200 levels, it has 200 activities?!! My next question is, assume that I am designing an application which includes 100 activities. User

问题 Some days ago I have published my application in Android Marketplace and a question came into my mind during designing and developing application. This question is about limitation or unlimitation of number of activities. For example, my application includes 37 activities. Is it so much? I want to know for a game such as "Angry Birds" which has more than 200 levels, it has 200 activities?!! My next question is, assume that I am designing an application which includes 100 activities. User

问题 I have a child component that contains complex input (some chart data). I am sending this chart data from the parent component through the @Input() decorator in Angular 5 after getting API response. So, I need to sync the chart according with the API response every time it gets changed on the parent component, hence, the OnChange Lifecyle. But unfortunately, I am not able to get this to work properly. I tried with setting a dummy input field with basic number type and increment it but in vain

问题 I have a "long-running" cleanup operation that I need to perform in onDestroy() of my Activity . What is the best way to do this? If I use a Thread to do this, my onDestroy() will return immediately; but what happens to the Thread reference? I am looking for advice on any implications/gotchas/trip-wires that I need to be aware of here since I assume that the process will still be alive even after the Activity is destroyed. Background: I am using JmDNS in my app. When the user is done with my

问题 I just introduced a bug into my code because I seem to have misunderstood the jsp tag lifecycle. The tag worked like this before the bug: I pass the tag some collection as an attribute, and it displays it as a table. The collection was passed into the JSP from the controller. After the bug: I removed the attribute which set the collection. Instead, in the tag I check if the collection is null, and then grab it by name from the request (using a naming convention). The thing that I didn't