Android redraw view. Incorrect clip rect in onDraw()? How android.

Android redraw view Here's some code: GameActivity. You can only set the user name to the related textview and dismiss dialog fragment. I need to redraw it periodicaly to get some "blink" effect. Jul 25, 2013 · I believe this is because Android will only redraw the TextView itself rather than all the parent views as well, meaning my overridden dispatchDraw() method does not get called. i want the linear layout to redraw the new function requested by th Sep 7, 2012 · In the setSomeProperty() method call setDrawingCacheEnabled(false) to clear the cache and force a redraw by calling invalidate(). invalidate(); If that doen't work you could try putting the heavy load on a AsyncTask Jun 15, 2014 · Force redraw of custom view (android) Ask Question Asked 10 years, 8 months ago. Feb 24, 2013 · The size of the view is specified by android:layout_width and android:layout_height. My requirement is to update the text size on all my views inside my fragment when my Activity is resumed. Is there a way to make the redraw happen immediately? Dec 21, 2014 · My android layout contains text fields that are populated upon opening the app. invalidate(i nt l, int t, int r, int b) make only the dirty area redrawn?. So what you can do, is create a method that changes those x and y co-ordinates, then call invalidate so that it will redraw it using your new vales. 4. There are some two interesting answers from Romain Guy in the google group. Jun 22, 2016 · Try invalidating the view before running the new voices(). Walking is real movement of me walking with the device in the hand. android. This article explores what requestLayout() and invalidate() do when a view is added to a ViewGroup, how they interact See full list on developer. recyclerview. decodeResource( How to redraw View in Android. java. 0 Feb 22, 2017 · 所以当我们进行View更新时，若仅View的显示内容发生改变且新显示内容不影响View的大小、位置，则只需调用invalidate方法；若View宽高、位置发生改变且显示内容不变，只需调用requestLayout方法；若两者均发生改变，则需调用两者，按照View的绘制流程，推荐先调用 Jan 29, 2025 · Caution: Adaptive refresh rate is supported on devices that implement specific HAL APIs and run on Android 15-QPR1 and above. Aug 30, 2013 · If the view is visible, onDraw(android. The problem is, the graph redraws itself at the end of the onTouch event. One way is that I create a new GraphView instance in the loop which should be final but I don't want to redraw all my chart every time because every time it draw it first it move to right for a second and then expand and place in the proper position. setAdapter(null) and then recyclerView. So, a "GONE" view cannot come back. postInvalidate(); Also note that redrawing a container might not redraw all of its views. Mar 28, 2014 · Basically I have a drawer with a button in it. The Android framework draws the layout in a two-pass process: a measure pass and a layout pass. VISIBLE) call recyclerView. graphics. asked Aug 27, 2013 at 13:06. 0. GONE will remove the View from the screen, and the space occupied by the View is released to other Views on screen. GONE) and then recyclerView. The following key parameters control the refresh Dec 5, 2011 · Yes but in this situation, user should click checkbox. One is invalidate and the other is postInvalidate Nov 29, 2013 · I'm trying to create a gridview that gives the possibility to the user to create a new child clicking on the last item on the gridview. I also use BaseAdapter for my gridview. Mar 8, 2012 · I've got three views in my activity in a linear vertical layout. Aug 5, 2014 · I have a visual element MyButton with a custom renderer implemented for iOS. Mar 16, 2011 · Im currently trying to implement the simple bouncing ball (in 2d) on my android device (physics based on device rotation and multiple balls coming in at a later point). ViewGroup import android. changeCursor(cur); // or swapCursor(), cur is the initial and the only cursor I have a problem with RecyclerView. Oct 25, 2015 · No it's not possible (in the normal sense). 6. Programmatically generated layout. I guess a partial redraw should be triggered by calling canvas. In my case I was invalidating a container (a ConstraintLayout) but the view inside it didn't get redrawn until I called postInvalidate() (from a service thread) directly on the view. Trying to re-use layouts with minor differences programmatically. mainscreen' below) tha Oct 26, 2024 · These methods play crucial roles in updating the layout and redrawing the UI. May 8, 2013 · I have a class that extends View and have the onDraw method implemented in my xml file I have a FrameLayout with my view and a RelativeLayout with a button &lt;?xml version="1. The corr Jan 6, 2013 · I used surfaceview to create a graph. getClassLoader()); } @Override public int describeContents() { return 0 Jul 31, 2012 · When paging back and forth a few times, the content will suddenly reappear. onResume() method. How to redraw View in Android. – theAlse Commented Jan 16, 2011 at 10:50 Feb 9, 2011 · I have my class implements Drawable. It will tell your view to redraw itself. How to adjust horizontal views in layout. Then in your on draw method you can see which one is being touched and draw it differently, when the user presses the screen, the view the user is currently touching is automatically invalidated. Jan 15, 2012 · View. schedule to schedule invalidateSelf() but nothing happend. For example Aug 9, 2022 · From the original question Android table as calendar view for whole year. what Extend by device; Build apps that give your users seamless experiences from phones to tablets, watches, headsets, and more. How to refresh a ListView in the activity. TextView import androidx. View. This works well for 90% items. View invalidate(int, int, int, int) part of a canvas, but onRedraw() the entire canvas? 0 Android Design: onDraw() not called after invalidate() Mar 24, 2018 · I need to redraw the entire recycler view items when the device orientation changes. However the image does not immediately show up. Dec 14, 2017 · How to refresh view in android. Hot Network Questions GONE means only, that the view is not taking any space in the layout, INVISBLE means, the view takes space eg. getBackStackEntryAt(fragMgr. The problem that i facing is it able to generate pie chart while on the first time however after select on spinner the chart Sep 25, 2009 · While scrolling, the whole screen get all messed up, again it looks like view is redrawn (when scrolled) without erasing the background first. ImageView import android. private class DrawableI Aug 7, 2013 · So when you want to change the data or invalidate the view that you need, you can call the findViewWithTag() method on the ViewPager to retrieve the previously instantiated view and modify/use it as you want without having to delete/create a new view each time you want to update some value. android下拉刷新实现原理【阐述基本原理，不建议使用】. Since it is necessary to redraw, you must first inherit the View class. Jun 16, 2014 · Android - redraw canvas. Dec 13, 2012 · View view = new MyView(); setContentView(view); Inside of your MyView class you would have an ArrayList of Path objects. While this is happening, the (x,y) information will be collected through Wi-Fi fingerprints and the map will be updated on the UI. Otherwise your animation speed would vary from device to device. e. Feb 6, 2025 · The SwipeRefreshLayout widget enables a swipe-to-refresh feature in Android applications, allowing users to refresh content in views like ListView or GridView by implementing the OnRefreshListener interface. onCreate Jul 18, 2016 · How to redraw View in Android. I have set this content in onCreate method of my Main Activity, but such changes di Nov 22, 2011 · Do you want to update some value of a view in the dialog or completely redraw it using a new layout of views? Android - Refresh data in an AlertDialog? 0. OnTouchListener. Here is my code. Please refer to Pull to Refresh with RecyclerView in Android with Example. I have a fragment that uses GridView layout. 2/ Custom View: draw it yourself using the canvas and math. It would be great if somebody post a code which would resolve this problem (it could be even two rectangles). To avoid a UI that feels sluggish or stutters during playback, ensure that animations consistently run at 60 frames per second… Feb 25, 2014 · I have created a layout that opens the dialog, and after entering the dialog, the user selects ok/cancel. layout. Don't use the updated onSizeChanged optimisation as it won't recalculate the position of the bars unless the size of view has changed. Depending on Jan 25, 2017 · Refresh Grid View Dyanmically in Android. content. I tried all kinds of th Feb 25, 2012 · android custom view redraw. The top and bottom views have fixed heights and the middle view takes whatever height is left available. View import android. xyz). Viewed 3k times Android view redraw. Clicked += (sender, e) => (sender as MyButton). Follow edited Jan 19, 2015 at 20:32. Adapter // and implement the Jan 5, 2013 · runOnUiThread(() -> view. The true cause of the problem appears to be that the changes made to testCanvass[0] within updateViews are not "sticking", i. The recycler view resides inside a fragment. VISIBLE) forces the Android framework to update the view visibility (<- forcing the view to redraw) even if the view is already visible. When an animation is initiated in Android, the display often boosts to the maximum refresh rate to ensure a smooth experience. 10. Incorrect clip rect in onDraw()? How android. Jun 1, 2010 · Android :: How To Redraw Only A Part Of My Custom View; Android :: Getting View To Redraw When Parameters Change; Android :: Why Setting TextView. Jun 20, 2012 · Invalidate, invalidateviews, notifyDatasetChanged, nothin worked for me! To just update the listview (with cursoradapter) I just do: cur = db. When I use postInvalidate method to update graph, surfaceview is redrawn but I don't want to redraw xy-axis. recyclerview_pull import android. So, I firstly get the current fragment (that's the latest one in backstack ): BackStackEntry latestEntry=fragMgr. com Oct 31, 2024 · You can force a View to draw by calling invalidate(). This is how I set the sizes Oct 5, 2024 · view; redraw; android-view-invalidate; titor. When the views are properly set up, crossfade them by doing the following: For the view that is fading in, set the alpha value to 0 and the visibility to VISIBLE from its initial setting of GONE. invalidate()); or. Preferences are defined in XML file - nothing funky just some categories and preferences nested within <PreferenceScreen/> Do I need to explicitly redraw the view? View has two very important methods: invalidate and requestLayout, which are often used for View redrawing and updating. Jan 29, 2014 · I am creating an app that displays the graphs of input given by a user. – Opiatefuchs Commented Sep 23, 2015 at 10:53 I have a fragment that inflates an xml layout. You should implement the behavior as follows. Nov 6, 2019 · invalidate() is a method that insists on forcing reDraw of a particular view that we wish to show changes. Invalidate： To farce a view to draw, call invalidate(). In my onCreate method I created a new instance of an AsyncTask to retrieve latitude and longitude from Google servers via JSON. Mar 5, 2024 · so there are two different ways to do this: 1/Combine different Views: such as TextView, ImageView, and Drawable resources. Every time Action_UP gets called, you add the path to the ArrayList, use view. getBackStackEntryCount()-1); String str=latestEntry. This is done by by implementing getIntrinsicWidth() and getIntrinsicHeight(). Ellipsize As Marquee Cause Its Sibling View In Linearlayout Redraw; Android :: Custom View Extending View-Class / Still Based On XML-Layout; Android :: How Do I Programmatically Add Gestures View To May 16, 2013 · @gulbrandr: @Konstantin: I added the code for the main-screen activity, please describe how I should redraw the whole activity again or just some parts of the view. From view docs This method was deprecated in API level 28. 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 Feb 13, 2018 · i'm struggling with this for a while, not sure if because almost 2 years of absence in Android DEV or my stupidity, I've tried everything and just cannot redraw my screen even if invalidate() is happening. The bitmaps should have a transparent background. In current situation item I'm sorry if my question seems common. Contribute to hehonghui/android_my_pull_refresh_view development by creating an account on GitHub. Below I include the XML code for the drawer. 3w次，点赞2次，收藏18次。本文详细解析了Android开发中自定义View的刷新机制，重点介绍了invalidate与requestLayout的区别及应用场景，帮助开发者理解如何高效地更新View。 Jul 6, 2016 · My target is do redraw view on language change. Modified 10 years, public class SkillPath extends View { Paint paint; Path path Mar 31, 2014 · android custom view redraw. There are two methods for implementing view update in android. at the bottom, there are two button. protected void onDraw(Canvas canvas) Canvas. Is there any simple way to trigger the redrawing of a parent view in response to changes in any of it's child views? I have GroupView which contains 4 ImageViews. view. Call setDrawingCacheEnabled(true) in the onDraw method after drawing to the canvas. Jan 6, 2012 · @manjusg What I am trying to do is just what is normally done with a view's background selector in xml (the background briefly changes color when pressed right before executing its callback), except that I want to change the background of a view different from the button that is pressed - namely the layout that contains the button and also a Today we will learn how to redraw View! The so-called redrawing is to redraw its appearance (style). I DO NOT want to use Activity. extends View. Aug 25, 2013 · How to redraw my view only partially to stop chosen elements always redrawing by new calculations (to drawing them from saved state)? I want to redraw whole view only when it is needed. Recycler view has only data which are available in the view. I have created a CustomDrawView class that extends View with a onDraw function that draws a circle in the centre of the screen. I am able to do this, but not immediately - the change doesn't oc Nov 28, 2021 · Force redraw of custom view (android) 2. 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. This will force a redraw on whatever is visible on screen. May 27, 2014 · I think the main reason why you don't see any changes on your screen is your MyPen view object sizes. public static class CustomPath extends Path implements Parcelable { private Path path; public CustomPath() { } protected CustomPath(Parcel in) { path = (Path) in. java. I tried to play with notifyDataSetChanged() method. Ask Question Asked 10 years, 8 months ago. I want to refresh the listView to requery the data Here's my layout that would open the di Aug 16, 2011 · android custom view redraw. In my android app, I download an image from the cloud. i'm struggling with Oct 19, 2014 · I want to display a Google Map on half screen of my profile view. Android - redraw canvas. (A piano keyboard) When a user touches the key, it causes invalidate() to be called and the whole keyboard gets redrawn to show the new state with a Jun 17, 2013 · your bitmap will move screen refresh rate times per second. 0" encoding="utf-8" Sep 30, 2013 · I'm trying to figure out the optimization for my custom view. I implemented the Interface View. The framework performs the measure pass in measure(int, int) and performs a top-down traversal of the View tree. Enable this behavior by adding the widget to your layout file as the parent of a ListView or GridView and implementing the refresh behavior that is invoked when the user swipes. To call from a non-UI thread, call postInvalidate(). 718 views. I want to prevent redrawing whole layout and Aug 16, 2016 · I have a custom view that fills my entire screen. I tried fragment. widget. setAdapter(adapter). Sep 22, 2014 · I can't recognise what is it's problem. . Feb 29, 2016 · I'm using a custom LayoutManager for RecyclerView (FlowLayoutManager) that is working fine and this is the function used for laying out the children: @Override public void onLayoutChildren(Recycle 滑动刷新界面模式完全在 SwipeRefreshLayout 微件中实现，该微件可以检测纵向滑动，显示一个独特的进度条，并在您的应用中触发回调方法。 Oct 19, 2011 · If you call your custom view's invalidate() method. Instead, the system recalculates the view with the new values that you supply. e. Ask Question Asked 8 years, 7 months ago. draw<Figure> draws only for first Nov 22, 2011 · I need the redraw to happen the moment the state of the flag changes. In fact after the user c Sep 9, 2012 · I know that this question has been asked other times, but I can't solve my problem! I create my own View (RadarView), extending View. IllegalMonitorStateException Feb 25, 2024 · In Android development, the onDraw() method of the View class is a crucial tool for creating custom graphics and visual elements within your app’s user interface. Now the View is NOT removed, instead, it hides the View and display blank space. restore(). Context import android. 2. If you want to keep the space, you can use View. How to update Grid Layout data Periodically. Only 90% of items will get the new style, but some items will have the old style Apr 9, 2015 · In my android application, in a view, there are RadioButton view, TextView, Checkbox view, date picker, clock picker and so on. When I click on the button I want to hide a view (another button) that is loaded in the FrameLayout. my_view); myView. I am using timer. Nov 2, 2010 · "Is there a way to make it redraw that row without calling listview. Asking for help, clarification, or responding to other answers. 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. Hot Network Questions Does the Moon fall to the Earth, but always misses? Aug 27, 2013 · Refresh view or activity on android. Create custom Feb 22, 2024 · Now that you have a well-designed view that responds to gestures and transitions between states, ensure that the view runs fast. i think i need to know what is it's position in the list. android redraw layout programmatically. Apr 6, 2018 · 文章浏览阅读2. How to refresh a Jun 11, 2014 · If you want to create custom view in which have to be your custom drawings for different touch states (pressed, selected, focused etc. Refresh all view in android? 0. You need to reload it. In place of ListView, we use RecyclerView. If the view is visible, onDraw(Canvas)wil Jun 1, 2024 · 具体的な描画処理はonDrawに記述する. Improve this question. gfg. I have a problem redrawing the view. API surface. I have google and have many results, but none of them I can apply. If you use the value 'wrap_content' it is up to the View itself to tell about the size it needs/wants. In this example, we would store data of string type into the ArrayList which is used for populating the ListView. getName(); Fragment fragment=fragMgr Feb 6, 2025 · package com. rawQuery( "SELECT * FROM ssnt WHERE mid = 1000" ); //optional, initial query adapter. Jun 21, 2012 · This means that the redraw will be performed only when the current code has all been executed (in this case, the for cycle). VISIBLE); But the view doesn't become visible. I had this working with the onResume(), but the problem with that was that the layout went back to the default state and did not save any input or button changes that had been made, this happened when I switched from one tab to the next. lang. 35; asked Oct 4, 2018 at 12:49. First, when you're creating your view with wrap_content attributes you don't pass this attributes to the parent in your constructor method. Modified 8 years, 7 months ago. getView(). Jan 6, 2012 · While you are correct that invalidate() does not happen immediately, it is the safest and best way to encourage a redraw. Android refresh listview adapter from another activity. invalidate() on the view (inside the linearlayout) but it doesn't redraw the row. When Android: refreshing list view from different activity. textViewOutputScreen. Invalidate(); and then the class will call the onDraw Method in your view class. Jul 30, 2012 · This view is actually a small map, from my point of view (It is a room and has shelves in it). First, create a new android project, we define a class, and inherit View, the class name is: DrawView: call recyclerView. ——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. Jan 25, 2011 · OK, I've established that the calls to invalidate() are causing all of the views to be redrawn, including view 0. When I debug to the end of the handler the graph is yet to be redrawn, but as soon as I continue the thread, the view is redrawn. I need to refresh it after clicking a long click. LayoutInflater import android. android layout not refreshing. readValue(Path. Android : Refresh GridView in Fragment. If you want to handle drawing outside of updates, Android provides a way to do that with the SurfaceHolder class. class. testCanvass[0] appears to be modified successfully within the scope of updateViews, but once the updateViews method completes execution and ends, the Aug 14, 2014 · I have a RecyclerView with a bunch of custom views which may change height after a while, because they contain ImageViews which load their image asynchronously. How to update the views without scrolling? Currently having problem while using AnyChart api to generate pie chart. I mean I just want to redraw chart every 7 second May 18, 2012 · Generally, invalidate() means 'redraw on screen' and results to a call of the view's onDraw() method. Feb 11, 2014 · In my onDraw I have all code needed to build my entire view but how can I detect if I want to perform only a partial redraw. when you have multiple rows and each one updates independently from the others. When you have multiple views on top of each other, calling invalidate() on one view will redraw all those views. But id doesn't update! I tried using "invalidate()" and " Jan 29, 2013 · I have created my own component which extends RelativeLayout, inside it I have a field of View type which is being positioned with margins: Blue quad represents my parent view, and a red circle is a Jun 27, 2011 · when a user selects a menu option, I catch it in onMenuItemSelected and then call findViewById(R. Can I redraw a View without forcing a redraw of the underlying View? 2. Jul 24, 2013 · notifyDataSetChanged() will redraw all views in your adapter. view. Oct 30, 2012 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Mar 29, 2017 · Instead of implementing a solution that is very specific to your problem, you can just implement a more generic one. Custom View redraws only once, then onDraw is called but screen is not updated. Nov 7, 2016 · How to redraw View in Android. You need to create a class that contains Path and the path needs to implement Parcelable. Modified 10 years, 8 months ago. notifydatasetchanged()?" -- just find it as a child of the ViewGroup (in this case, ListView) and modify it. Feb 10, 2025 · The swipe-to-refresh user interface pattern is implemented entirely within the SwipeRefreshLayout widget, which detects the vertical swipe, displays a distinctive progress bar, and triggers callback methods in your app. It seems as if Android is missing a view update here. RecyclerView // Extends the Adapter class to RecyclerView. 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. However, for built-in widgets you rarely, if ever, need to call it yourself. You can also do things with the MOVE and UP, so see if the user started/moved off the view. The problem i'm having is layout doesn't redraw with the refreshed view until i press the text input box. Redraw View Android. How can I do this ? By main layout view, I mean the one ('R. Diego Palomar. 1. How can I trigger within the onTouch method the redraw of the View? Do I need to implement a Thread / Runnable? I thought that invalidate() triggers the redraw, but this doesn't work. How to refresh view in android. White); //Or whichever bg color before drawing the bitmap. If I scroll down and then up and my view redraws with getView method of the adapter new text is shown. Since all devices have varying refresh rate, you need to use delta time in order to have screen updated in the same speed in all devices. ) and you didn't know whether this view will be placed inside other View that can intercept touch events or the view structure is even more difficult. To check device support, use the hasArrSupport() API. – Steve Pomeroy Dec 4, 2014 · android. May 24, 2017 · Basically, it's not possible because recycler view doesn't have whole data it binds on the scroll so u can't refresh whole recycled view with notifyItemRangeChanged(0, adapter. For a simple rotation a Tween Animation would be better suited. android: Creating Image and filling colors in Canvas. the place for the view is just empty, but taken. Jul 6, 2011 · To refresh view as a graphical way use invalidate it's call onDraw() and for recalculate view dimensions and any thing related to height , width , margins and padding use requestLayout it's call onMeasure() May 13, 2015 · The issue is in your getView() function. Jan 19, 2015 · android-custom-view; redraw; Share. Oct 4, 2018 · According to the android documentation, just call the invalidate() method as the redrawing area is calculated internally. 基本的な描画の種類 矩形・円・楕円・角丸矩形・弧・点・線・画像・文字列 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 At the end of the drawSomething() method, invalidate() the view so that the system redraws the view every time drawSomething() is executed. Aug 1, 2016 · I have made a customized imageview with some editing for length and height size in onMeasure() in the view class. This graph changes continuously over time. After setting the image, I then call postinvalidate(). voice(calcResult);. Sep 27, 2012 · In Android, Adapters are responsible for updating the contents of the Views they emit (they "adapt" the data to a view, by populating it). I am not 100% if this is what you are looking for, so post some code, and we can see what we can do to help. And second, i think you need to override onMeasure method to let your view know how much space it should I have a LinearLayout that I would like to change the background color of when one of its child views (an ImageButton) is clicked. Edit. BoundaryColor May 31, 2012 · To force any (Expandable)ListView to redraw, you can call the notifyDataSetChanged on the Adapter used by the view. I also noticed that when debugging with hierarchy viewer, selecting a view will always make it reappear, apparently because hierarchy viewer forces the selected view to redraw itself. I subclassed View to get an View on which the user can "draw" with his fingers. drawColor(Color. Force redraw of custom view (android) 0. g. There's not function call in the onTouch event handler that would explicitly do this. Feb 6, 2011 · I guess that code is in the View class. When I change params of one view(for example re scale image or rotate) this causes to redraw whole Layout. It maybe not be important but Actually I need to know what checkbox is clicked. So you override it like so: Aug 7, 2024 · Swipe-to-Refresh ListView is very much similar to Swipe-to-Refresh RecyclerView. invalidat Dec 28, 2011 · I have 1 activity that receives a json object from the server (database) and every activity called view (TableLayout but in ScrollView) automatically updates. One of them is add and the other one is reset. However, these views won't necessarily already have the correct images loaded into them, they are views that were previously being used for displaying different cells in the grid at different positions. I'm wondering if the calling to View. After Mar 4, 2025 · The pull to refresh component allows users to drag downwards at the beginning of an app's content to refresh the data. Provide details and share your research! But avoid …. Canvas) will be called at some point in the future. The RecyclerView does not pick up on this layout change, although I call forceLayout on the ImageView, and the RecyclerView is initialized with setHasFixedSize(false). invalidate() doesn't refresh View. Each View pushes Mar 20, 2024 · Finally, calling invalidate() triggers a redraw of the view, applying the transformations calculated to properly display the image within the canvas. recreate() and I have already tried: View myView = (View)findViewById(R. Clear grid view and regenerate Jun 29, 2015 · I have created a Custom gridView with a list of images &amp; a delete icon with each one of them. 12. Also depends on the bitmaps you are drawing. Extend by device; Build apps that give your users seamless experiences from phones to tablets, watches, headsets, and more. I want to force the main layout resource view to redraw / refresh, in say the Activity. When invalidate() is called on a view, it redraws anything that lies in the dirty region. Simply we can say invalidate() needs to be called when there was a change in view’s Apr 5, 2013 · I want to create an android application that gives the battery status (%) in a textView. This must be called from a UI thread. I also have an ImageView containing an image that I would like to change according the value of the battery Aug 18, 2011 · Call canvas. Example. The After this, I would like to refresh my currently displayed fragment's view to display with new locale settings. Feb 1, 2013 · For anyone else that stumbles across this. Viewed 3k times 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. As soon as the delete icon is pressed, the corresponding image is supposed to get deleted. invalidate() call recyclerView. INVISIBLE. For more advanced stuff (like game animations) you might need to create a custom view or use SurfaceView . This means that your adapter must extend BaseAdapter or BaseExpandableListAdapter. Diego I have a view in my android app that displays a graph. Use the PullToRefreshBox composable to implement pull-to-refresh, which acts as a container for your scrollable content. Refreshing a view? 0. canvas. Forcing layout to refresh after adding each view. Jul 24, 2020 · android中实现view的更新有两组方法，一组是invalidate，另一组是postInvalidate，其中前者是在UI线程自身中使用，而后者在非UI线程中使用。以下是我在android文档中找到的说明，引用public void invalidate()Invalidate the whole view. Red }; button. Nov 16, 2013 · Refresh a fragment's View after changes happened on Other Fragment on Android Load 7 more related questions Show fewer related questions 0 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(). I have successfully detach and attach current fragment, but drawer items are not translated. But nothing works. So if something changes and it needs to be reflected on screen, you need to call invalidate(). GridView reuses views by passing them to getView() in convertView. Refresh view or activity on android. " -- are you sure you have the proper row? Jan 7, 2013 · UpdateComments is my own function. getItemCount()); or any of this notify property. The same should be true for Fragment s, too. But when I delete the data in the database (from current activity or directly from the database), the layout won't update. The download is performed in a thread and in that same thread I also set an image view with the newly downloaded image. 1 answer. Crossfade the views. I tried to notify the fragment about orientation change through an interface and tried to call notifyDataSetChanged which resulted in a . Mar 10, 2010 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. save() then do drawing then call canvas. The graph is drawn on a linear layout using some library. invalidate(); with no success I have created a class RoundIcon which extends View and the class contains setIconImage() method: public void setIconImage(int imageFromResources) { iconImage = BitmapFactory. Note: PullToRefreshBox() is experimental. 0 votes. id. Call canvas. setVisibility(View. tags: Android game UI thread UP. For example a layout that will rotate everything what is inside, which in my opinion is much more elegant. but if user clicks row instead of checkbox nothing will happen. "I've tried calling view. I save pointers to current shown views in onScroll and ask every view to update the requested views, but nothing happens. When a view is invalidated, the system does not draw the view with the values it already has. dnfu yru jtbv lcxal tsfbazc xsfkzhd rll gnzptg ocj ggqq fnzoy stijzi smmcsjw ltqxur ngy