Android : Get Scroll Position In A List Activity?
Mar 23, 2009
I'm trying to get the scroll position on a ListActivity. Here is what I'm trying to do: I have a list activity that is populated from an XML file. Another thread downloads all pictures so the user can see the list while the thread is still downloading the files.
What I'm trying to do is when the thread finishes getting all pics it reads the listview scroll position, refresh the listview and scroll to that position again.
ListView main = getListView(); <-- not sure if I'm really getting the ListView this way. int scY = main.getScrollY(); Log.d("Scroll", scY + " "); <--- this is printing zero even when at the moment I run this I already scrolled the list. setListAdapter(listadapter); main.scrollTo(0, scY);
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Jul 8, 2009
How can I save and load the scroll position of a listview that is destroyed/hidden/paused.
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Jul 30, 2010
I have a listview displaying my data.Ok. I want to set the scroll position in a position of my choice, but I just cant do it. I used :
myListView.setSelection( anyPosition ); myListView.setSelected(true); and has not worked. I also tried : myListView.scrollTo(0, PositionY); and myListView.scroolBy(0, PositionY);
and there's a strange behavior, this two methods doesn't put the scrool in the "PositionY", it made the "PositionY" be the first position in the list, cutting everything that exist before.
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Jun 10, 2010
I have a long listView that the user scrolls around and then returns to the previous menu. What I want is that when the user opens this list View again the list to be scrolled to where the it was previously left. Any ideas on how this can be achieved ?
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Mar 9, 2010
I am using BaseAdapter for displaying the list. This list is fetched by calling a Web Service. At a time only 20 records are returned. Now, when the scroll of the BaseAdapter reaches the last record then the application should fetch more records from the server.
So, what I want to know is how to know the scroll position or some other way of knowing that the last record has been reached so fetch more records from the server. I don't want to implement the next and previous button on the screen.and so am trying to implement it in this manner.
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Mar 16, 2010
I'm new to Android. I would like to simply know where on a page the user has scrolled. When a certain point on the web page appears at the bottom of the screen, I want to trigger an event. But this code causes an exception. I know that WebView inherits getScrollY() from View. Am I not implementing it correctly?
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Apr 7, 2009
In my app, my main class extends ListActivity and calls a fillData() function to reload the list whenever changes are made. I'm still getting the hang of this, so I borrowed that concept from the Android Notepadv1-Notepadv3 tutorials. Everything works great, however whenever I need to change the list (remove an item, re-sort it, edit an item), the ListView refreshes and loses its scroll position. The scroll position is reset to the top after each fillData() call.
It appears to be resetting the scroll position to the top because I'm using setListAdapter() each time in fillData(), setting it to a new SimpleCursorAdapter. How can I get the list to "update in place", where the scroll position is seamlessly maintained to the user? I tried heading down the "items.changeCursor(cursor)" path, but that didn't seam to do much for me.......................
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Aug 11, 2012
Whenever you search for an app in the Android Market, click on one and realize its not the one you wanted, you click back but then the scroll position gets reset and you're at the top of the search results. This is even more particularly annoying whenever you look through your previously installed apps on the Android Market and try to re-install some. Its not fun having to scroll 5 pages each time.
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Jul 24, 2010
I have a GridView in my activity, and I want to save current scroll position while user goes to another place and restore it while user comes back. I try to use GridView.getScrollY and GridView.scrollTo methods, but getScrollY method always return 0 instead of right scroll position. Am I using this method in a wrong way?
Could anyone who can teach me how to retrieve the scroll position in a GridView?
I searched the Internet found that someone said we can use getSelectedItemPosition and setSelection methods, but this requires user to select at least one item, how about the case that no items is selected?
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Aug 26, 2010
I have a horizontal scrollview with text fields,here i need to get the first and last position of textview when i scrolled it,how can i get the position of textview when i scrolled.and also need to know how to set color for text when i clicked the particular text from this. sample code....
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Oct 10, 2009
I'm building a chat room application where new events are being polled for every X seconds. Every time that happens, this code updates the RoomAdapter (a custom subclass of ArrayAdapter) with the new data and scrolls it to the bottom:
RoomAdapter adapter = (RoomAdapter) getListAdapter();
for (int i=0; i<newEvents.size(); i++)
adapter.add(newEvents.get(i));
getListView().setSelection(events.size()-1);
This is fine, except that if the user is scrolling up to glance at the room's history, it's going to jump her down to the bottom when the poll happens. What I'd like to do is have it so that if the user is already at the bottom of the list, it stays there after a poll for new events. If the user's intentionally scrolled upwards, I'd like the user not to be disturbed.
How do I detect when I'm already scrolled to the bottom of a ListView?
Note: I can't do getListView().getSelectedItemPosition(), because as the docs note, calling setSelection when in touch mode does not actually select the item, just scrolls to it.
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Jul 22, 2010
I am aware of setSelection(), setSelectionFromTop(), and setSelectionAfterHeaderView(), but none of them seems to do what I want.
Given an item in the list, I want to scroll so that it is in view. If the item is above the visible window of the list, I want to scroll until the item is the first visible item in the list; if the item is below the visible window, I want it to scroll up until it is the last visible item in the list. If the item is already visible, I don't want any scrolling to occur. How do I go about this?
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Aug 31, 2010
I would like to after I have updated by listAdapter I want to make sure that the list is scrolled all the way to the bottom so that it displays the last element entered in the list How can I do this ?I tried this but no luck.
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May 18, 2010
I have a HorizontalScrollView with a series of CompoundButtons. I want to find the (x,y) for a given child view. I have tried using:
getLocationOnScreen()
getLocalVisibleRect()
getChildVisibleRect()
like this:
View tmpView = this.findViewById(viewId);
Rect hitRect = new Rect();
tmpView.getLocalVisibleRect(hitRect);
the hitRect is always 0,0 - 0,0.
I need the x,y mainly to scroll to a particular child view. Any help is greatly appreciated.
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Nov 20, 2010
I try t get the position of the item who contains my button.How Can I pass the position variable present in the getView method to my onClick Method?I will have several button In my View (Item view)
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Apr 7, 2009
How do I find the position of the item clicked in an Expandable List.
In a list view the listView.getPositionForView(v); is present which gives the position of the clicked item.
But in an expandable list how do i get to know the position of the grouppostion or the childposition
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Aug 19, 2010
My friend and i develop a Android program.
Now we got to the question if it's possible to get the actual position of an ListElement.
Example: You drag the list up and down, and now you want to konw which element is on the center of the screen?
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Aug 26, 2010
I have list view with fairly complex list view items consisting of several image views, several text views, progress bars, etc. Depending on the state of the item some of these elements can be show and some are hidden. I understand that listview recycles views. Right now I am dealing with slow listview scrolling especially on lower powered devices. What's the best way to deal with this problem?
I already optimized each list item view as much as I could. Now I am facing with what's the best? Use one single view with many children for all items and hide and show various children depending on the item state. This way I do not inflate each item view as list is being scrolled but need to show and hide constantly various child views.
Another approach is to build item view dynamically each time view is requested in the adapter getView method. In this case I can only add at run time those elements that are truly needed for current item state but this requires inflating item view every time.
Finally the third approach is most extreme is to have one custom view and draw everything myself. This of cause requires a lot of work.
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Jul 9, 2010
I have the Favorites widget on one of my desktop screens. Every time I scroll over to it, The pictures change position, and then snap back to the original order. Has anyone else noticed this, or have an idea why it is doing this? It's annoying.
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Apr 8, 2010
I have an activity that comes up over another activity. I'd like to position the overlying activity at the bottom of the screen without using an absolute layout, just like the soft keyboard.
I can't figure out if this can be done in an XML layout, and if so, where does it go?
I have a theme created, and the manifest is set to use it (this works). But overlaying activity is always positioned in the center of the screen. This is what I have. code...
How do I get the layout to show up aligned to the bottom for the overlaying window?
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Nov 4, 2010
I am on my first Android application and I am on a timeline so details and examples will be useful since my knowledge is still minimal. I want my first screen to present the user with a list of activities to choose from. In my situation it is a recipe app where the user first chooses the type of food, such as, Beef, Chicken, or Pork. I want the application to launch an activity depending on the list item that the user clicked on. I am not sure if I should use a list view, a text view, a scroll view, a list activity, an activity group...
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Mar 10, 2010
I have a background color applied to a ListView but everytime the list is scrolled the background color changes back to the system default (black). When the scrolling stops the color goes back to @color/window_background.The style is applied in AndroidManifest.xml:<activity android:name=".event.EventList" android:theme="@style/CKButtons"></activity> and my ListView looks like this: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
><ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/android:list"/>
<TextView
android:id="@+id/android:empty"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/eventlist_no_items"/>
</LinearLayout>How can I prevent this from happening?
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Nov 1, 2009
I have an ArrayList connected to a ListView with an onclick event that loads some extra info about each list item. When the list fits inside the screen (no scrolling) it works fine, however, when the list becomes long enought that I need to scroll I get the "Force Close" message.
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Mar 29, 2010
I after calling notifydatasetchanged();
i want to move scroll of list to the bottom of list so that user could see last record in the listview.actually i am writing Chat module so for that purpose i need latest record at the bottom of list. can any one guide me how to achieve this?
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Apr 7, 2010
Is there a way to absolutely position an UI element on Android so that it is located outside an Activity? For example: can you create a fullscreen ImageView simply by moving/resizing an ImageView inside an existing regular Activity instead of creating a new fullscreen activity?
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May 21, 2009
I am new to Android I've a List View. I want to auto scroll all the items of list view on button click event with some specified time interval, and also wants to update the Text View according to selected items. I tried something like this on button click.
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Oct 2, 2009
How to load data in expandable List Adapter through Scroll .
Means I want to add data as per Scrolling in Run time.
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Jan 21, 2010
When views with different type have same id and screen orientation changes,
either java.lang.ClassCastException: android.view.AbsSavedState$1 or java.lang.IllegalArgumentException: Wrong state class -- expecting View State will occur. (depends on the view's order)
Because View.dispatchRestoreInstanceState() checks id only.
You may wonder why anyone would make views with different type to have same id.
But it can happen when you use tab activity.
Imagine you have tab activity with two children activity.
Tab1 is ListActivity and Tab2 is ExpandableListActivity.
Both activity have id of "@android:id/list" but the type of view is different.
This means we cannot use ListActivity & ExpandableListActivit at the same in one tab activity.
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Jul 22, 2010
I am displaying some data in a ScrollView. On activity startup (method onCreate) I fill the ScrollView with data and want to scroll to the bottom. I tried to use:
getScrollView().fullScroll(ScrollView.FOCUS_DOWN).
This works when I make it as an action on button click but it doesn't work in the onCreate method. Is there any way how to scroll the ScrollView to the bottom on activity startup? That means the view is already scrolled to the bottom when first time displayed.
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Oct 4, 2010
I currently have a tab layout with 2 tabs, one tab with a list view and one with the option make strings so I can add them in the list view. Both tabs have their own activity because this made the code much more structured, and I dont have to repeat my self later.
Lets say im in the tab that offer me to create an string, and i press the update list button, how do I update the list view without startActivity()? If i use startActivity(), it starts List.java, and instead of displaying the list in the list view tab, it takes full screen, which defies the purpose of the tab view. In other words, the startActivity() steals the focus from the tab view of the list, and sends it fulscreen.
I want to update the activity in my list view tab, without starting a new activity that goes to fullscreen, and doesnt update the one in the tab.
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