savestate

问题 I want to know how to save my current state by modifying the existing JSON file. but I can't find a way to saving..... So I want to ask you about that. The size of the JSON file is not so big. So I considered total - loading and total - saving when the loading and saving state is called. but I think it is not efficient and unstable... So can I get some help? 回答1: please use this package https://pub.dev/packages/shared_preferences Wraps NSUserDefaults (on iOS) and SharedPreferences (on Android

问题 My application revolves around a HomeActivity which contains 4 tabs at the bottom. Each of these tabs is a fragment, all of them are added (not replaced) from the start, and they are hidden/shown upon tapping the appropriate tab. My problem is that whenever I change tab, the state of my scroll is lost. Each fragment which exhibits that issue uses a android.support.v4.widget.NestedScrollView (see below for an example). Note: My fragments that use a RecyclerView or ListView keep their scroll

问题 I am making a drawing program with pygame in which I want to give the user an option of saving the exact state of the program and then reloading it at a later time. At this point I save a copy of my globals dict and then iterate through, pickling every object. There are some objects in pygame that cannot be pickled, but can be converted into strings and pickled that way. My code is set up to do this, but some of these unpicklable objects are being reached by reference. In other words, they

问题 I want to save the state of my view controller. I searched and found that I should save the state by saving state variables. But I am interested in saving the view controller object itself. Is there any way to save the view controller object itself so that when I restart the application I see the same view state too on which I was before closing the app. Otherwise I have to reach that state myself and that will not solve the purpose fully as somethings like (the admob ad which was displayed)

问题 I made a custom RecyclerView in order to enable pagination in the lists of my application. I'm having a crash at restoring state. Maybe this crash is related to a known bug in the support library, but, teorically, it has been resolved in support library version 24.0.0 : https://code.google.com/p/android/issues/detail?id=196430, but it is still crashing. Maybe I'm doing something wrong? I'm having a BadParcelableException ClassNotFoundException when unmarshalling: android.support.v7.widget

问题 In short, I'd like to learn/develop an elegant method to save a binary tree to disk (a general tree, not necessarily a BST). Here is the description of my problem: I'm implementing a game of "20-questions". I've written a binary tree whose internal nodes are questions and leaves are answers. The left child of a node is the path you'd follow if somebody answered "yes" to your current question, while the right child is a "no" answer. Note this is not a binary search tree, just a binary tree

问题 I am developing an android app. If I press a back button the state of my application should be saved .What should i use to save the state ..am confused with all of these onPause() , onResume() , or onRestoresavedInstance() ??? which of these should i use to save the state of my application?? For eg when i press exit button my entire app should exit i have used finish() ? public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); s1=

问题 I have a weird problem. As I have asked in previous posts, I have a lot of data coming from NET in my app. The problem is that a lot of text and images r there, so though I can make the user wait wen he clicks on a list item, but I don't want to make him wait wen he clicks the back button. In the sense that I don't want to re-download all data; data 1ce downloaded should remain. Which 1 is the right method? 1. Using a special class which stores all data... and using the variables each time I

问题 in my java Project I have several classes/java files but is in Menu class that is stored all the lists of stuff that is used. In terms of data I store 6 Lists(2 ArrayLists and 4 HashMaps) which 1 is defined in Menu class and others are in different classes. So I need to create a savestate and a loadstate to when I close the program to restore the previous state. All the Lists are implemented with Serializable Is it possible to save all the Menu's state and reload it or I've to save all the

问题 I'm making a simple drawing application. I want to be able to save the user's drawing on the screen when the device orientation changes. This only happens in the main activity. I read that if the orientation changes, then the activity is destroyed and recreated again ( onCreate(Bundle created) being called). I'm not sure if it means that it should also call onSavedInstanceState(Bundle bundle) , because in my app it is only called if another activity takes the focus on top of my main activity,