Android :: Scrolling Between Views?
Oct 3, 2010
I'm currently working on a game for android.
I have three ImageView's next to each other, they're positioned next to each other using the "android:layout_toRightOf". The views are located within a RelativeLayout tag. Each of these views are centered into the middle of the screen using "android:scaleType="fitCenter"" and they fill the entire screen.
I'm attempting to implement a horizontal scroll from one view to another so that I basically get one view on my screen at a time.
Here is the code that I'm currently using
CODE:................
What I'm currently getting is three images next to each other -- but sometimes they take up less then an entire screen. I want both the left and right padding to be correct, so that I can only see one image at a time.
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Apr 13, 2010
I currently have one Scrollview which contains a table layout and one list in my activity. Now my problem is that I wanted to move both of them(Scrollview and list) together and with proper synchronization...
So if scrollview is being scrolled then listview should also scroll with the same distance, and vice versa...
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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Nov 16, 2010
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
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Feb 28, 2010
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
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Mar 6, 2010
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
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Jun 16, 2010
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
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Jan 25, 2010
Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
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Mar 7, 2010
Let's say I have a LinearLayout, and I want to add a View to it, in my program from the Java code. What method is used for this? I'm not asking how it's done in XML, which I do know, but rather, how can I do something along the lines of (One View).add(Another View) Like one can do in Swing.
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Sep 15, 2010
My app builds up a custom screen as dictated to me via the users 'application'. This means that I can end up in the situation where I have a parent scrollview and somewhere down the heirachy I can have a listView or a multiline TextView. Both of these scenarios continue to work fine under 2.1, however are broken in 2.2 (both device and emulator). The symptoms are that the child (list or textview) is unable to scroll using touch gestures although they can be scrolled using the keypad. Has anyone else experienced this behaviour and/or have a work around?? It appears that the onTouchEvent function in View has been changed substantially but I am currently delving into the code...
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Sep 11, 2009
I want to enable scrolling for textview. I set vertical scrollbar which appears but scrolling doesn't work. Why? I am not using ScrollView because HomeScreen widget doesn't support that component.
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Jul 7, 2010
I'm trying to make a layout that is something similar to how the android market is...where say under comments there is what appears to be a ListView but it does not scroll (the whole page scroll but not the comments). I'm not sure if its even a ListView but I want something that looks like the list view (ie. have those divider bars and what not but NOT SCROLLABLE). There are people suggesting to use a LinearLayout instead of a ListView but I also what the items to be clickable and open a new activity. Please help?
My current layout tree is like so
<LinearLayout>
<ScrollView>
<RelativeLayout>
I am looking to put content inside the RelativeLayout.
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May 22, 2010
Just wondering if anyone knows of a way to invert scrolling so that you swipe down-to-go-down and up-to-go-up instead of the way it is by default: up-to-go-down and down-to-go-up?The only reason it's a problem for me is that I have a laptop and use two-finger-scrolling on the trackpad (down-to-go-down/up-to-go-up). This means that when I switch from one to the other, I keep trying to go the wring way with my swipes. Confusing. I looked through all of the settings on the phone and tried googling and looking through the available apps but to no avail.
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Aug 16, 2010
I have a gallery and when a image is selected, I want to start new thread (for loading other images). But I don't want to do it while the gallery is scrolling. How can I know the state of the gallery and if it is still scrolling? I can't use "setCallbackDuringFling(false)" because I have a textview under the image that has to be updated during the scrolling.
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Dec 29, 2009
I have a list Activity 4 which i have extended the BaseAdapter and the getview looks like this.
public View getView(int position, View convertView, ViewGroup parent) {
View row=null;
for(int i=0;i<10; {
row = convertView;
if(row==null) {
LayoutInflater inflater = mContext.getLayoutInflater();
row = inflater.inflate(R.layout.parsed,null); }
TextView id = (TextView)row.findViewById(R.id.id);
id.setText(idvector.elementAt(position));
TextView photo = (TextView)row.findViewById(R.id.photo);....
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May 22, 2010
I have a ListView with custom rows. When any of these rows is clicked, the ListView's data is regenerated. I'd like the list to scroll back to the top when this happens.
I initially tried using setSelection(0) in each row's OnClickListener to achieve this but was unsuccessful (I believe because the ListView loses its scroll position when its data is invalidated - so my call to
setSelection is undone. I still don't understand how the ListView decides where to scroll to after invalidation, though).
The only working solution I know of was given by Romain Guy here: http://groups.google.com/group/android-developers/browse_thread/thread/127ca57414035301
It involves (View.post)ing the call to _listView.setSelection(0). I found this to perform quite poorly.
The newly generated list shows up with its scroll location unchanged and there is a considerable delay before it scrolls back to the top.
Is there any better way to achieve this functionality?
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Aug 19, 2010
In one of my projects I've got a ListView with hundreds of elements. But when scrolling through this list I get the following error:
CODE:.....................
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Jun 17, 2010
I have an ImageView that is twice the height of a normale screen ( 960 dip). I would like to scroll it nicely up and down on the screen. The bottom of the screen should contain a bottom. I have tried various combinations of ScrollView and Imageviews without any success. I have also thinkered with the :isScrollContainer attribute without results. Anyone knows how to do this?
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Jul 8, 2010
I am working on an Android app that has multiple screens the user will need to navigate between and I am curious what the best practices are when switching between those screens. I am torn between creating a new Activity for each screen and simply changing the view (setContentView(R.layout.whatever)). The screens all share at least some variable values so I'm leaning toward changing views and using class level variables, but I'm worried a single activity could become very large and confusing with logic for multiple screens in a single file. I'd like to keep the code clean and separated, but I also don't want to be passing several variables around between views if that isn't needed.Being new to Android development, I'm hoping some more experienced members of the community could share their thoughts and let me know how best to handle it
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Jan 2, 2010
I'm new at this, I have not seen any examples on changing Views, what I want to do is when a user presses a button I want to show a map view based on their input on the first view.
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Aug 16, 2010
im having a problem getting a custom view that i created on the xml layout file. i have a class named DrawingLayout which extends FrameLayout. it is found in the package Drawing
as stated on this page http://developer.android.com/guide/topics/ui/custom-components.html i used the following decleration in xml
<Drawing.DrawingLayout ... />
but whenever i run the program with that decleration i get a runtime exception error on SetContentView( ... )
is there something im not doing well? If you need any more details please tell me because i cant seem to figure this one out.
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Feb 18, 2009
I 'm beginner in Android ,To start with i was asked to do a simple task ,i need to make blue and red screen appear on the screen alternatively , to achieve this i wrote two layout files 1. main.xml -- for to display red screen 2. sub1.xml -- for to display blue screen
In oncreate() i wrote
for(int i=0;i<20;i++) { setContentView(R.layout.main); try { Thread.sleep(500); }catch(Exception e){} setContentView(R.layout.sub1); }
but this doesn't work ,why ? Please help to understand the concept
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Apr 13, 2010
I currently have one Scrollview which contains a table layout and one list in my activity. Now my problem is that I wanted to move both of them(Scrollview and list) together and with proper synchronization... So if scrollview is being scrolled then listview should also scroll with the same distance, and vice versa...
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Mar 16, 2009
whats the exact differences between 1. LinearLayout lin = LinearLayout.inflate (ctxt, R.layout.bla, null); parent.addView(lin); and 2. LinearLayout.inflate(ctxt, R.layout.bla, lin);? Both doing the same thing, or?
I got sometimes a different behavior.
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Aug 27, 2009
I am using 5 views in one LinearLayout my app.While going to each view i am removing previous view by calling linearlayout.removeAllView(). But I think this is not removing my previous view becoz when i checked memory usage.My app memory is keep on growing.and Becoz of this i am getting low memory :no more background process error and after sometime app is getting hang and then it is exiting.Please help me to solve this problem.How can we clear memory or how can we remove view.Its very urgent.I am using system.gc() and also i cleared object also but no use... I tried to use different activity for each View but at that time low memory is coming immediately.
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Aug 30, 2010
I have a login page which has a Advanced button. The button sets a view where a user can add some information. When I click save, it goes back to my main view (loginpage) and all info is cleared? How can I save the state of the first view when navigating away and then back to it?
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Jul 13, 2009
I have the instance to my activity, and I want to get all the views that are in this activity. I need to add a listener to each view, for any activity. That means I can't user findViewById. Is there any way to do this? I was hoping for a activity.getViews() or something, but it doesn't exist.
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Jul 10, 2010
Is there a way to get every view that is inside my activity? I have over 200 views including buttons, and images, so i want to be able to access them by using a loop.
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Oct 3, 2010
I have a set of views that are populated with data from an online database. The context menu has a "refresh" choice that re-reads the online database and updates some attributes of the views, like setText and setChecked for some buttons. After the various setTexts and such, I invalidate the Views. However, they are not immediately redrawn. In fact, they don't get redrawn at all unless something like a rotation happens to cause a redraw of the screen. How can I initiate an immediate redraw after the refresh is complete?
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Sep 1, 2009
How can I add some buttons below ScrollView that always stay on screen.
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