Android force view to redraw Feb 12, 2010 · For me after changing information in sql database nothing could refresh list view( to be specific expandable list view) so if notifyDataSetChanged() doesn't help, you can try to clear your list first and add it again after that call notifyDataSetChanged(). rawQuery( "SELECT * FROM ssnt WHERE mid = 1000" ); //optional, initial query adapter. Normally, you would also need to check to see if it's not the selected position so you can remove the border from a reused View. g Jan 25, 2017 · This did not force a redrawing of the view for me. Instead the app does nothing for 10 seconds and then outputs: 99. We are going to use RecyclerView and Redraw View Android. ViewHolder { public ImageView appSmallIcon; public ViewHolder(View v) { super(v); appSmallIcon = // . And call the invalidate() method when I want it redraw. When I click on the button I want to hide a view (another button) that is loaded in the FrameLayout. I am not sure this could be refreshed directly or if I need to close it first and re-instatiate it? Sep 3, 2015 · Performing a "refresh" to keep your fragment state up to date unnecessarily destroys and recreates the view when all you need to do is update your adapter data. setAdapter() again. invalidate() linearSliderDots. For a normal android. I want to imple Jun 16, 2010 · Android includes a process management system which handles the creation and destruction of activities which largely negates any benefit you'd see from manually restarting an activity. linearSliderDots. Just don't go deep into it If Mar 31, 2014 · To force a view to draw, call invalidate(). The reason this will work is that posting to the main handler will add it to the message queue which has already the call to Invalidate in it which will be executed before the call to Post() on the handler. 0 Problems with views when reloading fragment. at the bottom, there are two button. Apr 11, 2013 · DevExpress engineers feature-complete Presentation Controls, IDE Productivity Tools, Business Application Frameworks, and Reporting Systems for Visual Studio, Delphi, HTML5 or iOS & Android development. If so, you can presumably enable/disable that View. invalidate() on the view (inside the LinearLayout) but it doesn't redraw the row. If I scroll down and then up and my view redraws with getView method of the adapter new text is shown. I have looked EVERYWHERE and my little brain just can't understand a better way to refresh an activity. Refresh view or activity on android. Add a comment | How to redraw View in Android. Any help will be appreciated. e. I tried to: call adapter. The following key parameters control the refresh Dec 16, 2011 · How to refresh view in android. Feb 8, 2012 · I believe that when android 2. Apr 9, 2021 · The code in the question works in an Android View, and you are drawing on the Canvas in the onDraw method. g. Apr 5, 2021 · This is no different than, say, using a LiveData<List<Foo>> from the view system and mutating the Foos in the list, the observable for this LiveData would not be notified, you would have to assign a new list to the LiveData object. Can somebody please tell me if this is the best way to accomplish this? Nov 30, 2016 · If you set a background drawable for a View, then the View will draw it before calling back to its onDraw() method. Any suggestions that I can understand would be great. Is there a way to make the redraw happen immediately? Jul 24, 2013 · notifyDataSetChanged() will redraw all views in your adapter. Because I am using some custom views from libraries. A neat trick if you want to redraw only one view from your adapter is to call getView manually for it if its position is visible - i. You could try calling invalidate() to force a view to redraw. Reload to refresh your session. I want to refresh the listView to requery the data Here's my layout that would open the di Aug 19, 2013 · Since I want to keep the content that was generated on configuration change, I set android:configChanges="orientation" in my manifest file. Parent topicManipulating Views. 0. Ask Question Asked 13 years, 1 month ago. Follow answered Feb 9, 2011 at 7:11. requestLayout() } Jun 3, 2015 · This does not work for me. Thanks! Refresh Grid View Dyanmically in Android. INVISIBLE. Now, in regular intervals, this View object (which is a Feb 6, 2025 · To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. I can't seem to find a way to force a blocking UI refresh for a view in Android. Note that select Java/Kotlin as the programming language. Provide details and share your research! But avoid …. Th Apr 9, 2015 · In my android application, in a view, there are RadioButton view, TextView, Checkbox view, date picker, clock picker and so on. You may want to set the text in the textview, update some state in the activity (like an int field), and register some code to run after a while and increment. convertView is always null for a Gallery. My question is basically the same as How to force a view to redraw immediately before the next line of code is executed , but unlike this question I don't need to change background How to force a view to redraw immediately before the next line of code is executed. Add(p. setVisibility(View. If the main thread is sleeping, it is not free to redraw the view. Step 2: Adding dependencies. – eternalmatt. Jul 25, 2013 · Background. Android Update layout/view. But how about the SurfaceView ? It seems that postInvalidate() can be used to call its redraw. Now the View is NOT removed, instead, it hides the View and display blank space. You are drawing an horizontal line dividing the available space (=width) in points. Note: PullToRefreshBox() is experimental. The view model has two properties. invalidate() Jun 20, 2012 · Invalidate, invalidateviews, notifyDatasetChanged, nothin worked for me! To just update the listview (with cursoradapter) I just do: cur = db. Oct 17, 2011 · My problem is when I am in Portrait mode and showing Fragment B, if the user selects a menu option I want to refresh or redraw the View that is associated with Fragment B and can’t understand how to make this work. android redraw layout programmatically. Apr 20, 2013 · Now I meet some problems with the redraw of the view. The Android framework draws the layout in a two-pass process: a measure pass and a layout pass. I even threw in a delay loop between those assignments. Force a View to redraw itself. So, a "GONE" view cannot come back. , the ActivityIndicator doesn't show up at all. NET, WinForms, HTML5 or Windows 10, DevExpress tools help you build and deliver your best in the shortest time possible. notifyDatasetChanged()? I've tried calling view. x versions were scrolled, to make it faster the screen was turned into a bitmap and that is scrolled, instead of re-drawing each view that may potentially be on the screen. refreshDrawableState() without any visible difference. Contains(p. isNotACopy) If Not uniqueDeptIds. So I think I might need to force my view to redraw? Aug 5, 2014 · I have a visual element MyButton with a custom renderer implemented for iOS. Not even if I call listView. View, I will override the onDraw() method, put all my graphic login inside this method . Red }; button. For example Nov 16, 2013 · Android force Fragment to rebuild View. Those views implement onDraw to handle rotation changes. observe( //add observation code ) swipToRefresh. If you're having trouble with that, you're likely running into one of these issues: You're calling it before you actually have the data, or your -drawRect: is over-caching something. re: the redraw problem, you can force a redraw by reading a property from the element. Jan 7, 2013 · UpdateComments is my own function. In Android development, the onDraw() method of the View class is a crucial tool for creating custom Dec 13, 2012 · (2/2): If you change the size of your View in some way, e. invalidate() to force the View to redraw it's contents and as there is only one Thread here, it will wait until drawing is completed i. Jan 26, 2022 · ravenfeld changed the title Android: force a redesign of the view Android: force a redraw of the view Jan 26, 2022. However, now I have got another problem: One of my other fragments uses a custom landscape layout. " So I want a method that will force to re-call onCreateViewHolder for each items of the adapter. Sep 9, 2012 · I create my own View (RadarView), extending View. How to refresh view in android. userFeeds. sendEmptyMessage(REFRESH); Two options: either hold onto the reference for the ArrayList that you passed into the constructor so you can modify the actual list data later (since the list isn't copied, modifying the data outside the Adapter still updates the pointer the Adapter is referencing), or rewrite the Adapter to allow the list to be reset to another object. 195. I would assume that somehow my top most View in my View Hierarchy is getting invalidated. Search 'Redraw View' in the SOLIDWORKS Knowledge Base. I have a question concerning to an application some friends and me are developing currently. Hi I've a tabbed activity, and in the first tab I fetch data from server and show it in a recyclerview within card views. getView(position, convertView, parent); view. Below I include the XML code for the drawer. Nov 2, 2010 · I listen to a preference change and sometimes I need to change just one View inside the LinearLayout of a single row. How to force an entire layout View refresh? 0. You can force a View to draw by calling invalidate(). the first forces the View(s) to refresh. Just don't hold anything against me in the code. GONE will remove the View from the screen, and the space occupied by the View is released to other Views on screen. (You can also use key tag if the default tag is used somewhere else) @Override public View getView(int position, View convertView, ViewGroup parent) { View view = super. setNeedsDisplay() That will ask UIKit to redraw the button using drawRect(), but only if a redraw is not already queued. You need to reload it. Now, in regular intervals, this View object (which is a No refresh/redraw occurs though. How to force an entire layout View refresh? 4. Redraw View Android. Feb 5, 2011 · My ListView is using an extension of BaseAdapter, I can not get it to refresh properly. Mar 10, 2010 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To force the Activity to remeasure and redraw, you can override the onResume() method and do the following: 1. invalidate() and postInvalidate() both won't work since these simply notify Android that a redraw should happen at some point in the Ok. view. birkskyum added the android label Sep 16, 2022. I know that items is being updated correctly because once I scroll down the list, on the Wear, the real data is visible (thanks to the recycle views). For fetching the data from server I use the volley library. ——Extracted from View class source As you can see from the above sentence, the invalidate method will execute the draw process and redraw the View tree. 1. You're expecting the view to draw at the moment you call this method. This way you can be selective instead of redrawing the whole page all the time, which is Aug 30, 2013 · You can call these methods on one view in the Adapter's getView() method, or only call invalidate on the ListView (or other view) itself, and it will only redraw the visible elements. post { // here linearSliderDots is a linear layout & // I made add & remove view option on runtime linearSliderDots. One of them is add and the other one is reset. Asking for help, clarification, or responding to other answers. :) Here is the java code: packag Sep 27, 2012 · I've a big problem now, I really need some help, I've spent a week for it, but fail. Is there a way to make it redraw that row without calling listview. I am able to do this, but not immediately - the change doesn't oc Aug 13, 2017 · The view is only disabled after onResume has finished running. If you want to keep the space, you can use View. Commented Nov 28, 2021 at 19:50. GONE) and then recyclerView. webview to Redraw/Re-Render immediately ? Thank you, Feb 22, 2015 · RecyclerView always holds the last position scrolled, therefore you don't have to store last position, just call notifydatasetchanged, recycler view always refresh data without going to top. Feb 25, 2024 · Exploring the onDraw() Method: A Comprehensive Guide to Custom Drawing in Android Introduction. Aug 16, 2016 · Ofcourse, you need to store the info about what to redraw yourself and preferably not use a new Paint everytime, but that are details. So if you change something in your view, like the line thickness, call invalidate() after it. Invalidate： To farce a view to draw, call invalidate(). What seems to help _sometimes_, at least on Android, is putting a await Task. notifyDataSetChanged()? If I do this, sometimes I get a force close as (and I can't remember at the moment) but sometimes it cannot Delete properly - I think this may be because the database is currently open and it tries to open again. Add this code to your fragment : viewModel. Ask Question Asked 10 years, 11 months ago. Force redraw of custom view (android) 2. But where can I put the Dec 30, 2013 · Here's the property: Public ReadOnly Property affectedDepartments As SortableBindingList(Of Department) Get Dim uniqueDeptIds As New ArrayList Dim _affectedDepartments As New SortableBindingList(Of Department) 'Go through products For Each p As product In products. . BoundaryColor May 28, 2019 · Instead, if you want a view to redraw immediately, you should call its setNeedsDisplay() method like this: myButton. The top and bottom views have fixed heights and the middle view takes whatever height is left available. so unless you override this, the colours are going to stop being drawn until the scrolling stops Jun 23, 2019 · Unfortunately since android handles UI refreshes in a non-blocking way the progress bar won't appear before the login function runs. Jul 23, 2014 · Set the tag of every view when the list is getting the view from adapter. You switched accounts on another tab or window. @Published var objectWillChange = ObservableObjectPublisher() @Published var refresh: Bool In the view I have a @observedObject vm, but when the vm changes the view doesn't redraw. changeCursor(cur); // or swapCursor(), cur is the initial and the only cursor I have a fragment that inflates an xml layout. Adapter<MyListAdapter. [Edit] Jun 14, 2016 · If you only need to update the data which user inputs from your dialog you do not have to redraw whole layout. I am guessing that I need the TextView to refresh during the loop. API surface. Thanks. you must have seen in logcat that there is too much work in UI thread. Where(Function(pr) pr. hows. invalidate(); Aug 23, 2014 · However, if I remove the character in the same method that I create and share the image, the app crashes because it didn't get a chance to redraw the view first. You signed out in another tab or window. invalidate() and view. That way you know your view will eventually be updated. But id doesn't update! I tried using "invalidate()" and "postInvalidate()" but they doesn't work! Here is the code of RadarView: `public class RadarView extends View Jun 25, 2010 · hi guys, i hope this is the correct section in the forum. I had crashes when I cached a View that was used with a scroller and that was like 5 times the height of the device, since it used > 10MB memory! Aug 10, 2012 · Actually I have tried the following methods: checkbox_visable=true; fileList. ViewHolder> { private ArrayList<StatusBarNotification> myList; Context ctx; public class ViewHolder extends RecyclerView. 12. html ] Android : Force a View to redraw itself Note: Dec 15, 2012 · From my understanding of the layout/measure/draw process, this will only occur when the invalidate() method is called on a specific view, and that will trickle down and perform a layout/measure/draw pass for that view invalidated and all of its children. This means that the redraw will be performed only when the current code has all been executed (in this case, the for cycle). And also I've read the following questions, but they didn't help me: How to force a view to render It's easy enough to reset the Branding dictionary and fill it with Spanish translations, but how can we force the controls to refresh from their bound sources? I am trying to avoid two-way data binding here b/c we don't want the code overhead of creating a backing property for each Text property of the controls. We have class which extends View. How do i get the android layout I expect to see the content of my view change from A to B to C to D. In my case, I wanted an image refresh on locale update but, apparently, it seems that, since the resId does not change, the ImageView just disregards your request, not checking if the resource itself has changed. You could instead use an event-driven approach and implement a pattern like an Event Bus, to which consumers can publish and subscribe. Shared: namespace RendererTest { public class MyButton: Button { public Color BoundaryColor { get; set; } } public static class App { public static Page GetMainPage() { var button = new MyButton { Text = "Click me!", BoundaryColor = Color. cs_dept_id) Then uniqueDeptIds. tech/p/recommended. Drawing on Canvas and refreshing. May 4, 2012 · The first method is perfered, as notifyDataSetChanged will recreate every visible View. How to update the views without scrolling? Oct 31, 2012 · The way UI element works in android is that if you want to access elements you must do that in UI thread, and we get data from API or internet related stuff from nonui thread so after getting the result of the nonui thread we can update the UI threads elements easily. Share Follow Jan 15, 2012 · View. To force a view to draw, call invalidate(). May 28, 2021 · The problem is the WebView won't be updated (Redraw/Re-Render) while WriteCharacteristic() is running, the WebView Redraw/Re-Render only after WriteCharacteristic() finish, mean at progress-bar 100%. Feb 25, 2014 · I have created a layout that opens the dialog, and after entering the dialog, the user selects ok/cancel. Modified 10 years, 11 months ago. cs_dept_id) Dim d As New Feb 18, 2015 · I think you need to consider your design as mentioned in the comments, having said that you can achieve your goal by using Post() on a handler to execute checkEnd(). e. Mar 31, 2014 · Calling invalidate() will tell the view it needs to redraw itself (call onDraw) sometime in the future. Mar 8, 2012 · I've got three views in my activity in a linear vertical layout. Mar 28, 2017 · public class MyListAdapter extends RecyclerView. After setting the image, I then call postinvalidate(). Just to be sure that we are on same page. setTag(getItemId(position)); return view; } Oct 1, 2009 · The guaranteed, rock solid way to force a UIView to re-render is [myView setNeedsDisplay]. I am new to Android development. width(); it will force a redraw. This works just fine for the fragment. My requirement is to update the text size on all my views inside my fragment when my Activity is resumed. But when it is used from android app, rotation is not getting handled. close and issue an adapter. I tried fragment. The only result is that it takes a long time to eventually see the letter "D" show up. Commented Jul 5, 2012 at 15:57. It is related to that stuff. Directory Structure: Note: There are some extra elements in drawable which are used in recycler view. Invalidate simply marks the view as needing a redraw but doesn't redraw it synchronously. notifyDataSetChanged but onCreateViewHolder is not called; call recyclerView. The download is performed in a thread and in that same thread I also set an image view with the newly downloaded image. While you are correct that invalidate() does not happen immediately, it is the safest and best way to encourage a redraw. You can only set the user name to the related textview and dismiss dialog fragment. 20 Refresh or force redraw the fragment. If you want to handle drawing outside of updates, Android provides a way to do that with the Reprinted: Overview: View has two very important methods: invalidate and requestLayout, which are often used for View redrawing and updating. Aug 27, 2013 · We need to force update the view with the below methods. But I want it to be re-drawn. I have a problem after a member posts a new comment the (recyclerView ) is not updated in real time. Feb 11, 2022 · Android : Force a View to redraw itself [ Beautify Your Computer : https://www. Is this the best way to refresh the data set, or should I look towards removing the . Nov 14, 2017 · Are you running you're code from the Main thread? When you update a view, it doesn't get redrawn until the main thread it free. It just saved me some hours of confusion with regards to ImageView refresh. Jan 20, 2011 · Is there a way to force an android view to redraw it's background? I have set a drawable shape with a gradient as background which works fine but after changing the view's height you can see those ugly gradient steps. The child drawing order can be overridden with custom child drawing order in a ViewGroup, and with setZ(float) custom Z values} set on Views. In a Jul 5, 2022 · You signed in with another tab or window. Apr 24, 2020 · I am working on developing an application that contains (recyclerView ) display member responses. The first child need to redraw to send it's size to the second child for some line drawings that need to be re-aligned. Android : Force RecyclerView to redraw its itemsTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"I promised to reveal a secret Mar 28, 2014 · Basically I have a drawer with a button in it. The Jun 21, 2012 · This wouldn't work because invalidate() only schedules a redraw in the main thread event queue. Feb 13, 2025 · The pull to refresh component allows users to drag downwards at the beginning of an app's content to refresh the data. The framework performs the measure pass in measure(int, int) and performs a top-down traversal of the View tree. But it just jumps right to the final value ("D"). Use the PullToRefreshBox composable to implement pull-to-refresh, which acts as a container for your scrollable content. you get current LayoutParams of a View and you modify them, but NOT call either requestLayout or setLayoutParams (which calls requestLayout internally), then you can call invalidate() as much as you want, and the View will not go through the measure-layout process, therefore will not change its size. Android : How to force a view to redraw immediately before the next line of code is executedTo Access My Live Chat Page, On Google, Search for "hows tech dev Android : Force a View to redraw itselfTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"As promised, I have a hidden feature t In Android, when your Activity resumes, it may not always get remeasured or redrawn, especially in full-screen scenarios. This is my first piece of code in swift and I haven't worked with neither swift nor with Objective-C :-D. Jan 19, 2014 · call View. Apr 1, 2015 · I would like it to show the same layout. create a MapActivity (A) start another Activity (B) from (A) start another MapActivity (C) from (B) back (C) -> Click Redraw View on the View toolbar, or click View > Redraw, or press Ctrl+R. The same principle applies to compose state. Request a layout update using requestLayout() on the top-level view, and . 6. So I will have to redraw the entire layout so that the view's onMeasure will be invoked – Jan 18, 2016 · Here's a code example of how you might set up your ViewModel with the INotifyPropertyChanged method of sending messages to update the UI: public class MyViewModel : INotifyPropertyChanged { /*****/ /* Property that you have created two-way binding for */ /*****/ private double _myProperty public double MyProperty { get { return _myProperty; } set { _myProperty = value; OnNotifyPropertyChanged Nov 7, 2016 · This will force relayout the view's children immediately (given that view's own width and height does not need to change) How to redraw View in Android. VISIBLE) call recyclerView. Thanks Happy Coding Nov 28, 2021 · This will force a redraw every frame, which I'm guessing you don't want – cactustictacs. so say you do this: $('#myElement'). However the image does not immediately show up. Oct 31, 2024 · It also takes care of drawing the View background for you. I have selected one of x pages that are available to scroll through in ViewPager. In my android app, I download an image from the cloud. I. Delay(100); Apr 9, 2018 · You can use a "loadTrigger" to trigger data load , when swiping to refresh . However, at least on switching between pages, the screen output gets stuck on the old view, and nothing seems to happen until the new page ist completely rendered in the background. Apr 24, 2011 · I don't know if this will force an immediate redraw of the action bar or not. Here is the code for it: _hRedraw. It is possible that showAsAction simply automatically creates action views for you. Jan 6, 2012 · It is strongly discouraged to pursue this approach as Android is specifically designed to avoid drawing outside of normal updates. Nov 22, 2011 · I need to update a custom dialog content whenever that dialog is ready to be drawin. Improve this answer. For a simple rotation a Tween Animation would be better suited. next instruction will not be executed until onDraw() is completed Feb 25, 2012 · I only redraw a part off the View, but everything else is black. getView(). Jun 25, 2010 · hi guys, i hope this is the correct section in the forum. 7 Aug 19, 2012 · There is only one part left and that's the part where you send a message to your handler to refresh your view. trojanfoe trojanfoe How to redraw View in Android. I have a LinearLayout that I would like to change the background color of when one of its child views (an ImageButton) is clicked. Whether using WPF, ASP. 4. notifyDataSetChanged(); listview. The idea is fairly simple, to render a reflection effect below any child Views declared within the ReflectingLayout. android custom view redraw. addClass('foo'); // youre not seeing this take effect if you do this afterwards: $('#myElement'). Thank you both for this. Share. invalidate(); But it just can not recall the my specified adapter's getview() method Feb 14, 2016 · Now my problem is that I can't redraw the view, when the corresponding data gets updated. Jul 18, 2016 · How to refresh view in android. What can I do? I tried view. Clicked += (sender, e) => (sender as MyButton). I tried the getView method and getLayoutInflater method but the screen doesn’t change because I think I am creating a new view. I have written a custom Android View based on a LinearLayout which I have called ReflectingLayout. Option #2: See if getActionView() returns anything for the affected MenuItem. When I refresh, it appears that the old data draws on top of the new data, until a scroll event happens. Viewed 21k times "To force a view to draw, call invalidate(). I never see "A", "B" or "C". loadFeeds() } When your Android app adds different values either automatically or by user input, you sometimes need to force the app to refresh the view, which updates what the user sees on the screen. Also note: Bitmaps are quite heavy on the memory usage of your app. I save pointers to current shown views in onScroll and ask every view to update the requested views, but nothing happens. 10. From menu I invoke action that somehow process data in underlying db and change it. Note: I already tried runOnUiThread(new Runnable() {}); My Question is, How to force mainactivity. when you have multiple rows and each one updates independently from the others. I would expect it to update the text view each time through the loop so I would get: 1, 2, 3, 99. However, the Gallery always creates a new View. Thank you! To force a view to draw, Refresh a view Android. setOnRefreshListener { viewModel. 2. efksph ulylpu gdswam sqeae dutw hvduyp fss zogft yodh qkjzik gssqcih eacin vgnskml ompl jkzch