Android :: Getting A RadioGroup To Redraw With Correct Button Checked
Oct 7, 2010
I have a RadioGroup view inside a LinearLayout. The radio buttons are added from dataList. If I call the code below from inside onCreate, the correct button is checked. However the dataList can get updated from time to time and after that happens I call this code again, without destroying the Activity. After that, the view is redrawn but no button is checked. I suspect the RadioGroup checked-button bookkeeping is getting confused by the removeAllViews call. Any ideas what might be going wrong?
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Nov 22, 2010
I have a linearlayout that is filled with texviews dynamically when i click on a button , but the content of linearlayout doesn't appear, how can i redraw it?
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Feb 19, 2010
How can I disable RadioGroup, means all the radio buttons should e disabled.I already tried setEnabled (false) and setClickable(false) but this did not.
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Mar 4, 2010
I want a group of buttons where a user can choose one of them as option. It has to be a radiobuttongroup like behaviour, but I don't want the radio circle to be present. I just want the user to be able to toggle only one of the buttons.I think I would need someting like a togglegroup.Does something like this exist in Android?
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Sep 2, 2010
I'm trying to place a set of Checkboxes within the same RadioGroup in a tabular fashion.I tried to have a couple of TableRow objects within the RadioGroup, but that removes the "group behaviour" and allows more than one Checkbox can be selected at the same time.I am able to put all the items on a single line (by setting the RadioGroup's "orientation" to "horizontal") but not in a grid like style.
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May 30, 2010
I have a ListView, which has a TextView and a RadioGroup with 4 RadioButtons as Children in each row. Now i can select a RadioButton in each row. But if i scroll the ListView, my Selection is gone or it does not show correctly. For example, i choose the RadioButton A in the first row, if i scroll through the ListView and then go back to the first row again, either none of the RadioButtons in the RadioGroup is checked or RadioButton C is checked instead of A.How can i fix this Problem? I have tried 7 days already, but still i find no solution.
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Aug 21, 2013
So i am programming a Quiz app for a school program, The app has 10 pages with a question on each.
On the question pages i have a next button, and back button, a textView and a radioGroup with 4 radioButtons. I want my code to be able to hold the data, so that if say 1 question is answered with the 3rd. radiobutton the app holds this data while i continue to the next page.
This is the Jave code [
public class Question1 extends Activity {
[HIGH]public void onCreate1(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_question1);
[Code]...
How i could make it happend? or general pointers on the app, this is my very first Android and Java protject
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Jul 29, 2009
I have an expandable list view with a static array for the group data and an SQLite database for the child data. It is implemented with the BaseExpandableListAdapter and works great, except, when I edit the database to delete or add children to the list I do not see the changes onscreen. It looks like I can use the registerDataSetObserver method to notify the adapter and expandable list of a data change. What I have to do in the callback to make Android redraw the list after data changes is what I need to know. Can I do it? Documentation on this part of the SDK is a bit sparse and expandable list view example code is not a good match. Can anyone offer advice on how to use a DataSetObserver? It feels like I have to switch over to a Cursor type adapter.
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Mar 10, 2010
I've found that after changing the overlays on a MapView, the changes aren't seen until the user moves the Map, causing a redraw. Is there a way to force this redraw?
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Sep 29, 2010
I'm implementing a fairly standard app with the Android sdk that involves drawing using the SurfaceView, SurfaceHolder, Callback setup.
In my main thread (UI thread) I have no drawing or handling of the SurfaceHolder (or the canvas you retrieve with it).
In a separate thread I have the following:
CODE:...............
This code is being executed, throws no exceptions, and has no negative side effects that I can find; however, the unlockCanvasAndPost() call never causes onDraw() to be called.
In other words, unlockCanvasAndPost() does not cause a redraw of the SurfaceView.
Any ideas what could cause this symptom? I have plenty of java experience, a fair amount of android experience, and a lot of debugging experience and cannot track this one down.
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Sep 20, 2010
I want to get a set of Views to redraw after I change some drawing parameters. I'm calling invalidate() and forceLayout() on the parent of the Views but nothing happens. If I rotate the screen then the Views redraw correctly using the new parameters, as you would expect. What else do I need to do to get the Views to redraw?
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Aug 14, 2009
I have a custom view, that overrides the onDraw() method. For better performance I want to redraw only a small part of Canvas in onDraw().
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Jun 1, 2010
I have a custom view that fills my entire screen. (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 touched key.
Currently the view is very simple, but I plan to add a bit more nice graphics. Since the whole keyboard is dynamically rendered this would make redrawing the entire keyboard more expensive.
So I thought, let's look into partial redrawing. Now I call invalidate(Rect dirty) with the correct dirty region. I set my onDraw(Canvas canvas) method to only draw the keys in the dirty region if I do indeed want a partial redraw. This results in those keys being drawn, but the rest of the keyboard is totally black/not drawn at all.
Am I wrong in expecting that calling invalidate(Rect dirty) would "cache" the current canvas, and only "allows" drawing in the dirty region?
Is there any way I can achieve what I want? (A way to "cache" the canvas and only redraw the dirty area?"
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Oct 17, 2010
It looks right, but the problem is that the radiobuttons doesn't connect between each other, i mean that they can be both on in the same moment.I think it's because even if they're hanging from the same the second one is inside another layout.Does anyone have some idea how could I make this kind of layout (Mainly the [textedit] just right the RadioButton B), getting working also the radiobuttons?
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Apr 15, 2010
I have created a custom component in my program by extending a ViewGroup. This component listens to touch events and are supposed to start animations when the user has move their finger past some certain points.I'm able to start animations while the user is touching the screen. But I'm not able to start animations if the user doesn't move their finger. It's probably that the phone thinks it doesn't have to update the screen if the user isn't moving their finger.I added some logs and according to them the animation starts and ends but it doesn't draw on the screen. I have the same problems when starting an animation with a timer.I use AlphaAnimations and Translate Animations on ImageViews. I have tried to use invalidate() both on the component and the ImageView but it doesn't help.Anyone who has an idea how to solve this?
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Nov 8, 2009
I am new to Android development, just reading docs and trying the APIs. I am quit confused how ImageView managed to draw just a part of its content after an invalidate(Rect) invocation.
I've checked ImageView.java, found no other drawing method except onDraw(Canvas), but onDraw(Canvas) only cut the drawable only if it is beyound the view's visible boundary. I also read the implementation of View.invalidate(Rect), I think the key of this function is calling to mParent.invalidateChild(this, r);
However, I think the parent view doesn't know how to draw the child in the given Rect, it finally has to call some method of it child to paint out. Has anybody investigated this part of codes? Would you please give me some guide?
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Oct 11, 2010
I wish to work with checked list views wherein only one item can be selected at a time. Some queries related to this:
1) Is it advised to work with CheckedTextView as the ListView items, or a combination of CheckBox and TextView?
2) If using CheckedTextView, the text comes first and the checkbox appears on right edge. Is it possible to make the checkbox come on the left of the TextView?
3) How can I make one of the items as checked in onCreate()?
I am using array adapter and calling setAdapter() to populate list.
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Jun 1, 2009
I have a ListView containing a few different type of items, all having their own background image and font color. In my first implementation I implemented each type of item as its own layout with the background image etc defined in XML (and implemented Adapter.getView() so that it only reuses convertView if it's of the correct type). This works fine but the performance is not that great while scrolling since I'm inflating quite a few Views due to convertView mismatches, so instead I tried using the same layout for all items (to benefit fully from convertView reuse) and changing the background image and font size in runtime. I even keep the three background Drawables I need as members to save time decoding them from a resource for each item, and call View.setBackgroundDrawable() from Adapter.getView(). The problem is, sometimes the 9-patch is not correctly wrapped around the content of the list item when using this approach. While scrolling it usually looks correct but when the scrolling stops, or sometimes when I just tap anywhere on the list, the background 9-patch of some large items starts flickering and is either cropped or resized to its original PNG size rather than stretched to wrap the content.
First of all, I suspect this is a bug? Any ideas why this happens? Could it be that the View is not always measured to reflect the changed content when the 9-patch is applied? I have tried adding an extra call to View.invalidate() but it doesn't solve the problem. Second, does this approach sound reasonable at all, or how should I go about to optimize this scenario?
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Feb 3, 2010
We are using TextView's Ellipsize function to scrolling text in it and there many other controls in our window. We noticed CPU would go up to 50% if text started scrolling. After digging deeper, we found all controls in our layout kept drawing when texts scrolling. We wonder why? And how to avoid all controls redrawing?
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May 6, 2010
Given a listview that shows checkboxes next to a list of people, I want to be able to get the names (in Strings for example) of the people who are checked. I have set my listview mode to allow for multiple checks.
getCheckedItemPositions()
Will get the positions but I can't figure out how to iterate over the listview to get the names. Also Eclipse tells me that getCheckItemIds is not a valid method for ListView.
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Aug 14, 2010
I have a ListView that just contains a CheckedTextView. I have a very simple CursorAdapter that populates CheckedTextViews. When I click on an item, I can see that I am responding to the correct row, store the value in my model and the CheckedText gets checked. However, when I scroll down and then back up again, while I see that the model contains the correct value (in #bindView), calling #setChecked on the CheckedTextView has no effect. Ie All items are unchecked. Code...
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Oct 11, 2010
I am using a ListView in which only one item can be checked at a time.
This is my custom list_row.xml :
CODE:..........
I populate the list in onCreate() using a normal array adapter :
CODE:............
When the list is displayed, I want to have, say the 5th item, in the list as Checked. How can I go about doing this? I know CheckedTextView has a function called setChecked(), but how can I get my 5th item from the list to apply this function on it?
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Feb 16, 2010
I have list of checkboxes in list binded by Custom simpleCurserAdapter. in my Custom simpleCurserAdapter ive override the newview and binview with my modifications. ive managed somehow to do multichoice.. wierd thing after i delete any item from my list , the first item's checkbox is being checked all of a sudden.. how does that happen? how can i solve it?
code: my curser SimpleCursorAdapter class:
CODE:......
I couldnt find another way of doing this, but this is how i set listeners to my checkboxses
CODE:.....
Now this is code part from the ListActivity class which desbribes the button which deleting the checked Box items
CODE:......................
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Sep 9, 2010
Basically it is deleting my oldest text from the particular person when I receive a new text from said person. Seems 10 texts is the threshold.I didn't make any changes and this started occurring.
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Feb 14, 2010
Ive got ListActivity and i am using custom CursorAdapter. in each item of the list ive got also checkbox. now i have in my list screen a perm button, when you press on it, it should find all the checkboxes which are 'checked' and do some operations on the item which it's checkbox is 'checked'. how can i retrive all the checked ones? ive done focusable:false, so i can use OnClickListener, but i dont know how farther then
this..
some code:.............
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Mar 21, 2010
The problem is that when I filter the list the entries switch position in the list view. Take for example three entries: 'A', 'B' and 'C' where 'C' is checked beforehand (i.e. the entry at position 3 in the list). When I type a 'C' on the keyboard, only the 'C' entry is displayed (as intended). Now 'C' is not checked anymore, since the entry has moved from the checked position 3 to the unchecked position 1 in the list.This behavior leads to some not very welcome effects in the app. Is there a way to "move the selection with the filtering", i.e. bind the checked state to the entry and not to its initial position in the list? Or do I need to find a new approach?
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Feb 13, 2010
I have a list view having several items and it is multichoice list. I want to display the checked item of list view. how i can do this.can anyone help me?
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Oct 30, 2010
I've got a dialog which shows a list of checkBoxes. I'd like to set different boxes checked each time the dialog is showed. But that only works the first time.. I want it work every time the dialog is showed!
This is my code...
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Sep 4, 2010
Has anyone else noticed that after updating to Froyo, that text wrapping/redrawing is not working properly while web-browsing?For example, if you go to a text heavy website, like Reddit, and I zoom in (either by double-tap or pinch), the text will redraw, but it will be slightly larger than the screen's width. To read the text, I am required to scroll a bit to the right, then back to the left, and so on.I never had this problem prior to the Froyo update. Can anyone else confirm that they are having this problem? before I get bombed on, I should say that I am very happy with Froyo in other regards. I have not had any battery drain issues or any lag anywhere. I did not do a factory reset.
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Aug 4, 2010
I was usind ADW for a while and liked it. I like LP better because of the scrollable bar bit when I hit the home key or back up to home, about 50+% of the time it takes ten seconds to redraw. I do ude widgets but it should not be this bad. In settings I tried keeping LP in memory, I set high mem useage and many of the other options and its the same. I even uninstalled wiped cache pulled battery and its the same. Is there a setting config I should be using, or not?
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