notifydatasetchanged

Listview is working incorrectly with implementing a load more function

若如初见. 提交于 2019-12-11 15:39:46
问题 So, I have a listview and getting the data for it from an external database. I would like to have 20 items the first time, then if the user scrolls down it loads another 20 and so on. class ItemAdapter extends BaseAdapter { private ArrayList<Item> objects; private class ViewHolder { public TextView text_tt; } @Override public int getCount() { return SIZE; //return 9; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return

The expandablelistview adapter child not updated on runtime by calling notifyDataSetChange

人盡茶涼 提交于 2019-12-11 14:38:27
问题 There is a button on BaseExpandableListAdapter on group view for adding comments in its child. When adding the item to the list and called notifyDataSetChanged() inside that adapter class, it is not changing instantly but changed after collapsing and expanding the list. private List<String> ParentItem; private LinkedHashMap<String, List<JsonCase>> ChildItem; public View getChildView(final int listPosition, final int expandedListPosition,boolean isLastChild, View convertView, final ViewGroup

Calling notifyDataSetChanged() on my adapter that is within a ListFragment causes a NullPointerException?

我是研究僧i 提交于 2019-12-11 13:18:19
问题 Introduction: I have the following set up: A MainActivity with methods onNewIntent and processNewIntent , the MainActivity also implements FragmentActivity ; and has a tabbed fragment which implements FragmentList A listaddactivity activity that creates a new Parcelable listControlObject The listaddactivity activity sends an intent carrying a parcel which then reconstructs the listControlObject inside of the MainActivity 's onNewIntent and processNewIntent class. However; I can take in the

how to get update values from expandable listview

冷暖自知 提交于 2019-12-11 10:34:45
问题 I am getting old values from expandable listview when i click ok button from my activity class, i have one activity class and one adapter and two getter setter class as per child and parent of expandable listview , i want to do add and sub qty as per screen shot but i m not getting update value please help this is my activity class code public class ExpandMainActivity extends Activity { private static final ArrayList<ExpndChild> data = null; ExpandableListView expList; ExpndListview

notifydatasetchanged() not working after onbackpressed()

﹥>﹥吖頭↗ 提交于 2019-12-11 04:15:15
问题 My recyclerview is not updating correctly after the back button is pressed. The recyclerview works fine before the back button is pressed The data is properly updated (seen in the log) but the recyclerview does not reflect the change The purpose of the handler is to poll the database for a notification (working fine) The notification toast is displayed everytime I am not receiving any errors If I can provide any other information to help do not hesitate to ask. Main: public void onCreate

remove row from another activity

穿精又带淫゛_ 提交于 2019-12-11 02:36:45
问题 I have a listview which is inflated by custom array adapter and onclick takes it to another activity with the data related to that row .After clicking on delete its supposed to delete the item from the list and get back to the list. I am using the code below for this : int deleteposition=CustomizedListView.deleteposition; CustomizedListView.list.removeViewAt(deleteposition); CustomizedListView.adapter.notifyDataSetChanged(); finish(); But there is an error at this line : CustomizedListView

Android ListFragment update/refresh and onItemClick

岁酱吖の 提交于 2019-12-11 02:28:00
问题 I´ve a problem in my Android Project. It´s a music track player, which shows each track in a ListFragment. Every item has got a Bitmap, where an oscilloscope is drawn on the bitmaps canvas. The items in the Listfragment are refreshed periodically. This is done via notifyDataSetChanged(); I also want to mute one track when I click on the item, but the onItemClick event doesn´t get fired every time. Only sometimes. Can anyone explain this to me? What am I doing wrong here? It works perfect

PagerAdapter changed the adapter&apos;s contents without calling PagerAdapter#notifyDataSetChanged

无人久伴 提交于 2019-12-10 14:54:24
今天开发的时候遇到了如题的异常。上网搜到了个答案: After ADT 22 the PagerAdapter has gotten very strict about calling notifyDataSetChanged() before calling getCount(). It evidently keeps track of what it thinks the count should be and if this is not the same as what getCount() returns it throws this exception. So the solution is simply to call notifyDataSetChanged() on the adapter every time the size of the data changes. 解决办法就是必须要在对adapter的data做改变之后马上调用notifyDataSetChanged()。搜索了代码,确实发现有没有调用的地方。改了就好了。 来源: oschina 链接: https://my.oschina.net/u/268088/blog/789742

Calling notifyItemChanged() on a RecyclerView.Adapter from another class

北城以北 提交于 2019-12-10 09:56:49
问题 I have a RecyclerView in AdapterActivity . After clicking on any of its items, I update that item using my AlertDialogShow#UpdateStudent() method. My problem is that I can not refresh the Adapter inside the UpdateStudent() method using notifyItemChanged() . How can I refresh the Adapter from another class that does not have direct access to the Adapter ? In the AdapterActivity with the RecyclerView : holder.itemView.setOnLongClickListener(new View.OnLongClickListener() { @Override public

你还在用notifyDataSetChanged?

北城以北 提交于 2019-12-09 10:26:06
想到发这篇帖子是源于我的上一篇帖子 #Testin杯#多线程断点续传后台下载 。 帖子中讲述的项目使用了listView这个控件,而且自定义了adapter。在更新item的进度条时发现每次使用notifyDataSetChanged(),都会去调用自定义adapter中的getView方法。这时问题就出现了,用notifyDataSetChanged方法去更新listView中的item,是更新需要更新的Item呢?还是更新所有的item呢?如果是更新所有的item那么效率不就会很低吗?有什么办法可以解决这个问题呢? 怀着心中的疑惑,我开始了这次的实验。。。 我的想法很简单现实模拟远程下载文件,创建一个Activity做主界面,主界面采用listView。然后自定义一个adapter实现BaseAdapter,再创建一个线程类,线程类当中采用循环的方式不断的往adapter发送消息.然后使用notifyDataSetChanged方法更新界面,在调用getView方法时在控制台输出语句,这样我就可以知道notifyDatatSetChanged方法执行时是更新一个item还是更新所有的item了。 有了思路就好办了,我们先建立一个类,叫FileState。 public class FileState { String fileName;//文件名字 int