updates | 易学教程

What will happen to the SharedPreferences on update an Android App?

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I've stored user settings in the SharedPreferences in my App. What will happen with the SharedPreferences when I update the App via Google Play Store to a new version of the App? Will the SharedPrefernces still be there after the update or will they be deleted? So far I haven't found an answer on the web or Stackoverflow (may I search with wrong keywords?). Can you point me to some links they describe this process? Edit: Meanwhile I found a other answer too: SharedPreferences behaviour on Update/Uninstall Edit 2: Since time past quite a bit when I first asked this question I recently learned

Android: How to update an UI from AsyncTask if AsyncTask is in a separate class?

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问题 I hate inner class. I've a main activity who launches a 'short-life' AsyncTask. AsyncTask is in a separate file , is not an inner class of main activity I need async task updates a textView from main Activity. I know i can update a TextView from onProgressUpdate, if AsyncTask is a inner class But how from an external, indipendent, async task ? UPDATE: This looks like working : In acitivty i call the task backgroundTask = new BackgroundTask(this); backgroundTask.execute(); In the constructor i

Retrieve only 5 users at a time :Firebase [like Instagram]

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问题 For the past few days, I have been trying to create an Instagram-like feed for my app. To be more specific: load new posts (5) each time the user updates the feed from the bottom. I am currently using Firebase to both store and display my data. My code so far, looks like this: var ref:FIRDatabaseReference! var dict = [String:Any]() var posts = [[String:Any]]() override func viewDidLoad() { super.viewDidLoad() tableView.delegate = self tableView.dataSource = self ref = FIRDatabase.database()

Can't add script component because the script class cannot be found?

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问题 Yesterday I updated unity from unity5 to 2018.2.2f1. Unity scripts are not loading after Update 2018.2.2f1. Once I try to play the Scene the scripts are not loaded and I can\'t add the script again it gives this error: Can\'t add script component \'CubeScript\' because the script class cannot be found. Make sure that there are no compile errors and that the file name and class name match. 回答1: If you still have the old copy of the project, upgrade the Unity project to Unity 2017 first then to

Update a dataframe in pandas while iterating row by row

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问题 I have a pandas data frame that looks like this (its a pretty big one) date exer exp ifor mat 1092 2014-03-17 American M 528.205 2014-04-19 1093 2014-03-17 American M 528.205 2014-04-19 1094 2014-03-17 American M 528.205 2014-04-19 1095 2014-03-17 American M 528.205 2014-04-19 1096 2014-03-17 American M 528.205 2014-05-17 now I would like to iterate row by row and as I go through each row, the value of ifor in each row can change depending on some conditions and I need to lookup another

Unity 5.5 obsolete particle system code

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问题 Before 5.5 particle system variables could be accessed via ParticleSystem and were read/write. Now they\'re accessed via ParticleSystem.MainModule and thus a lot of code has become obsolete. The API Updater has not been able to fix most of the issues. I\'ve read through the new documentation but I can\'t figure out how the new variable types are supposed to be used. For example in JetParticleEffect.cs this line causes a warning: // set the original properties from the particle system m

Can't update Android Studio - only download

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问题 I have not updated my Android Studio for a while and am presented with this dialog box when trying to update: Usually there is an \"update and restart\" option, but not here. The only option is \"Download\" which directs me here where I can only download the entire bundle again which gives me a link for Build Number - 130.737825. As you can see that\'s before what I already have so I don\'t see how that would fix the problem? I feel like I\'m missing something blaringly obvious, but how can I

What's the currently recommended way of performing partial updates with Web API?

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问题 I\'m wondering how to implement partial updates with ASP.NET Web API\'s RESTful interface? Let\'s say for example we are passing objects over the wire of the following structure: public class Person { public int Id { get; set; } public string Username { get; set; } public string Email { get; set; } } How would one support updating just parts of a Person at a time, for example the Email property? Is it recommended to implement this via OData and the PATCH verb, or would it be better to

MongoDB - Update an object in nested Array

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问题 { \"_id\": \"xPBc4By8FemDwTPqH\", \"u\": { \"_id\": \"6PoZawHZcQz4Gwzcv\", \"username\": \"michael\" }, \"friends\": [ { \"u\": { \"_id\": \"eGqDjAjjtYADbuSnn\", \"username\": \"michael\", \"name\": \"michael\" } }, { \"u\": { \"_id\": \"k4gKCGwYryXDMMHvs\", \"username\": \"joyce\", \"name\": \"joyce\" } } ] } I want to update the name of \"friends.u.username\": \"michael\" \'s name is \"hello\", how I need to do it. 回答1: Apply the $set operator together with the $ positional operator in your

Is there a way to automatically update application on Android?

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I'm developing an application that will most likely be preinstalled on devices. It will be also available on Google Play. Is there a way to update those instances that are not downloaded through Google Play, since Google Play won't notify users about an update. I was thinking about, as suggested here , trying to contact my site periodically, and when update is available, download it. Is there a way to do this update automatically, or even silently, so that user doesn't have to do anything (like running the package manually). Or, when my site shows update is available, to offer users an update