Android : Can I Know When A Listview Has Scrolled To Top?
Nov 17, 2010
I'm trying to add a stikcy header to a listview. I've put the header-field and the listview inside a relativelayout and defined the listview's android:layout_below="@id/header".
The problem is that I want the listview and the header to be positioned at the same place when the listview is not scrolled to the top. The header's background is transparent. I drew an amazing image in paint to illustrate how I want them to interact.
I figured I could override the listviews onscrollistener and change the listviews layout_below-tingy at runtime when it's getScrollY() == 0, but that seems to happen all the time.
Has anyone done something similar that could point me in the right direction?
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May 19, 2010
I have a scrollview and I only want an event to happen if it's already scrolled to the bottom but I can't find a way to check if the scrollview is at the bottom.I have solved it for the opposite; only allow the event to happen if it's already scrolled to the top:ScrollView sv = (ScrollView) findViewById(R.id.Scroll);
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Oct 21, 2009
I made a custom widget (which is just a composite like):
<LinearLayout> <TextView> </LinearLayout>
this widget is focusable and reacts to touches. I'd like it to change its background color to the default system highlight color when the user scrolls to it, and have it blink when the user taps it (just like an element of a ListView does).
I can add an OnFocusChangeListener for when the user scrolls to it, and in the handler do the changing of the background color.
How would I add the 'blinking' behavior though when the user just taps it with a finger? I did something like this as a test code...
this is just a guess. Is there a correct way of implementing this behavior?
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Jun 14, 2010
I have a long scrolling list of EditText items created by a SimpleCursorAdapter and prepopulated with values from an SQLite database. I make this by: cursor = db.rawQuery("SELECT _id, criterion, localweight, globalweight FROM " + dbTableName + " ORDER BY criterion", null); startManagingCursor(cursor); mAdapter = new SimpleCursorAdapter(this, R.layout.weight_edit_items, cursor, new String[]{"criterion","localweight","globalweight"}, new int[]{R.id.criterion_edit, R.id.localweight_edit, R.id.globalweight_edit}); is.setListAdapter(mAdapter); The scrolling list is several emulator screens long. The items display OK - scrolling through them shows that each has the correct value from the database. I can make an edit change to any of the EditTexts and the new text is accepted and displayed in the box. if I then scroll the list far enough to take the edited item off the screen, when I scroll back to look at it again its value has returned to what it was before I made the changes, ie. my edits have been lost. In trying to sort this out, I've done a getText to look at what's in the EditText after I've done my edits (and before a scroll) and getText returns the original text, even though the EditText is displaying my new text. It seems that the EditText has only accepted my edits superficially and they haven't been bound to the EditText, meaning they get dropped when scrolled off the screen. Can anyone please tell me what's going on here and what I need to do to force the EditText to retain its edits?
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Jan 6, 2010
Before I can set a full wallpaper that scrolled between homescreens... Yesterday I downloaded OPEN HOME... not sure if that effected it or what, but now when I try to set a wallpaper... its long and vertical and doesn't scroll with screens... its a stationary wallpaper... Any pic I set does this except for the pre set wallpapers on the phone...
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May 21, 2010
I send my plant inventory spreadsheet to my gmail account each morning. It has six tabs (pages) of info on it.
I can't find the tabs when I view it on my hero. I've scrolled up/down/left /right to all edges and the tabs don't appear.
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Jun 26, 2010
I would like to change text and back ground color of my Listview without building custom rows. Is this possible ?
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Jun 24, 2009
There must be a way to do this. How can you tell a ListView that has a header to not scroll it when the user scrolls the contents? I want it to stay in a "stuck" position so that the user can always see what column the content applies to.
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Sep 9, 2010
In my project i m parsing xml and i want to put it in xml list with in list.
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Apr 4, 2012
I have some class LoginActivity.java. In the onCreate method I retrieve ListView:
ListView list = (ListView)findViewById(R.id.snListView); then:
list.setAdapter(adapter);
In addition there are login.xml layout - there are:
<ListView
android:id="@+id/snListView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
and sn_row.xml:
[Code]...
At the moment I have cell's height 100dp, I need that cell's height will depend on device, I mean I have here 5 cells showing at login screen in ListView and I need that these 5 rows will fit the ListView (cell's height = ListView's height/5).
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Sep 26, 2010
I have a listview within an activity and at the bottom of the screen I have a scrollable gallery, my problem is making the listview clickable, I would normally use the listview position by doing if(position == 3) and then create the intent but postion is being used by my gallery. I listview is in the main.xml populated by an array.xml, can I add an id i.e android:id in the arrays.xml and create an intent with that, or can I create a listactivity and still use position to fire an intent if so how would I do this.
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Mar 16, 2010
I am very new to Android, but I love it because it has given me back what i was longing for : Java.
but I am facing some doubts and confusions about is, since I am totally new to Mobile App Development:-
I am listing my queries here-
1.) I wish to put various items in a single element of a ListView. Like one image in the left, so many TextViews in a single element, and more things. Is it possible?
2.) I wish to give my text different colors, different sizes, and different fonts. how to do this?
3.) I wish to insert or delete elements from a List in ListView. How to do that?
4.) I wish to change the background color of my list. how to do this?
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Sep 11, 2010
i can add to a db and list as a listview. When I click a list item using onListItemClick, what statement do I need to get the value? ........................
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Aug 1, 2009
I am beginer to the anroid ,i am using the below code for displaying listview and i am not able to getting the onlistitemclick events for further ui's. package com.List;
import android.app.Activity; import android.app.AlertDialog; import android.app.ListActivity; import android.content.ContentUris; import android.content.DialogInterface; import android.content.Intent; import android.content.DialogInterface.OnClickListener; import android.database.Cursor; import android.database.DataSetObserver; import android.os.Bundle; import android.provider.Contacts.People; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.TextView; import............................
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Sep 13, 2010
i want to implement listview with uses different xml layouts for rows depending on underlying item. A non optimal solution will be int getView method just to inflate every time a new view depending on the item from the adapter. Is there a better way to do this?
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Mar 24, 2010
is it possible to let my ListView show 2 different rows? On the picture you can see at the top something like a "teaser", the other rows are normal ListView. The screenshot is from the iPod. With their framework it is possible to show 2 different row styles. I badly need this on Android... Otherwise I would use a tabel design. But adding rows dynamically would be such an overhead instead of using ListView SimpleAdapter addItem...
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Jun 23, 2010
Is there a way to do groups in a listview? Like I have a list of certain states, each state has its own sublist. I'd sort of like to replicate the HTML optgroup/option setup where you have a parent group then child groups. Is there a way to do this built in or would I have to do something tricky with a custom view for Parent elements then switch the view back to the child element style.
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Aug 9, 2009
I have a problem, I want a appwidget with a listview, but it seems that appwidget does not support this elment.so is there any way to reslove it?
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Jul 8, 2010
how to remove a row from a Listview? I have an Adapter that takes care of the List and when I try mAdapter.remove(Object) it does not remove the "Object" I passed but instead the last row on the list. I have tried different ways and it always ends up deleting the last row.
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Oct 13, 2010
I have to add a gesture to my listview,i want to implement the same functionality of contact application.
when i left swipe it should send a message,right swipe it should call. can anyone help me how to do those gesture detection... i have implemented it in various other views... but i couldn't do for listView... i don't what going worng...
My code is:
CODE:...........
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Jul 7, 2010
I have a listview that's populated by rows that get their data from a web server. It all works totally fine except I want to have a refresh button to re-download the data. I'm getting the data through an asynctask (getting the data in doinbackground) and then setting the listadapter in onpostexecute. All I do to run the asynctask which should take care of everything is run
new PopulateListTask().execute();
However, in my optionsSelect method, creating a new asynctask just like I did in oncreate doesn't do anything. It doesn't even enter doInBackground. I've tried using listView.invalidate() and listView.invalidateViews(). Is there some special way I'm supposed to repopulate a listview?
My only guess is that since I'm using a custom adapter, my getView method is creating some kind of error, but that wouldn't explain why it's not even entering my asynctask's doInBackground method. Thoughts?
Posting some code. This is a trimmed down version.
CODE:............
I'm getting this in my logcat when executing my asynctask the 2nd time. Any idea what it means? I tried googling to no avail.
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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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Nov 24, 2010
How i can use custom listview with textview and imageview.i tried following code
CODE:...............
But it is not working.
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Aug 1, 2010
I have a listview with a bunch of items in it, each item has its own background, the problem is that if i only have one item in a list, the rest of the "empty" slots of the list is black. I tried applying a background around the listview and also on the view that sorrounds it (relativeView) and i get a strange margin around the whole list like the picture at the bottom. The question i have is, how can i remove the actual "borders" around the list so it still fills upp its parent ?
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Nov 3, 2010
I try to write a xml like below xml,but always get an exception say that"Caused by: java.lang.UnsupportedOperationException: addView(View,LayoutParams) is not supported in Adapterview". It is say that in layout xml can not use <ListView> </ListView>,and it should be <ListView />and be manipulated using java code,is it? Code...
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Oct 20, 2009
How do I get a box appear in a different color listview practically the first field is the title.
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Feb 16, 2009
I'm facing to one problem with ListView. I would like to refresh the ListView every time I change the base data.
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Oct 12, 2010
I have a 3 buttons, say LanguageButton, CountryButton and PinCodeButton. When LanguageButton is pressed, I must display a list of languages. Similarly for CountryButton a list of countries and so on. Only one list is to be displayed at a time.
My question is whether it is better to define a single ListView in my layout or 3 separate ListViews for each list in my layout!
I tried to use a single ListView and set corresponding adapters when different buttons are pressed, i.e in onClick() of languageButton, I give setAdapter(languageArray);
But my doubt arose in implementing the onItemClick() of the list. Because what must be done whenfirst item is clicked in languageList is different from what must be done in countryList. Hence that would add to more code in the java file.
So I am just wondering whether I should simplify my onItemClick() code by defining separate ListViews, or should I simplify my layout and add logic to code?
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Mar 14, 2010
i'm having a problem (newbie one) with a CheckBox Listener AND a ListView. I need to request the '...long id) that passes through the Overriden method onListItemClick and put it into a OnCheckedChangeListener. How should i do that?
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Oct 28, 2010
I have a child Activity that contains a ListView. This Activity is populated asynchronously from a SQLite cursor. The list items contain a TextView, a RadioButton, and a normal Button. The XML is shown below:
CODE:...............
I have to do some logic to determine which RadioButton is selected by default, and I can't do it until the ListView is already loaded. The problem is that with all the events I have tried so far (onCreate, onPostCreate, onResume, onWindowFocusChanged), the ListView child count is zero. I've also tried using the getView method in the ArrayAdapter class, but that method is called mutliple times and the ListView child count is potentially different every time, leading to unexpected results. Apparently, these events are firing before the ListView has finished being completely populating with its child items.
Is there an event I can listen for, or some other way to determine when the ListView is finished populating and has all of its children accessible to be modified programmatically?
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