Databases
StackOverflow2013
Postsdbo
POHow to update Android ListView with dynamic data in real time?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to update Android ListView with dynamic data in real time?
    primarykey
    data
    text
    <p>I have a background thread loading data which I want to display in an Android ListView. The data changes very often (i.e. 1-2 times per second). Sometimes the number of rows in the dataset changes too (but certainly not as often as the data in the cells changes). </p> <p>There are two ways to update the data in the cells, as far as I can tell:</p> <ol> <li><p>Have the background thread notify the UI thread that new data is ready, and the UI thread can then call BaseAdapter.notifyDataSetChanged(). However, I have read in more than one place that if that method is called often, it will be slow, because the ListView has to restructure all of its subviews Views.</p></li> <li><p>If the dataset count has not changed, I could possibly find all of the visible ListView cells that are associated with the changed data, and update the values manually without calling notifyDataSetChanged(). This would probably work, but I think its unfortunate that I have to update the views manually when the List Adapter is supposed to handle the update notifications and mechanisms for me when I notify it. This method also won't work if the dataset count changes over time (i.e. not only is the data within each cell of the ListView changing, but the total number of cells in the ListView can grow or shrink based on the background thread supplying realtime data).</p></li> </ol> <p>I would certainly appreciate thoughts from others who have implemented this scenario, and how they optimized code simplicity and most importantly, performance.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USAndroid Dev
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTDuplicate
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow to update Android ListView with dynamic data in real time?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POHow to update Android ListView with dynamic data in real time?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow to update Android ListView with dynamic data in real time?
      1. USAndroid Dev
      1. VTFavorite
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload