Databases
StackOverflow2013
Postsdbo
POHow do I notify views owned by a custom adapter that they're going away?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow do I notify views owned by a custom adapter that they're going away?
    primarykey
    data
    text
    <p>In my current project I've extended BaseAdapter (using the tutorial EfficientAdapter as a guide) to handle a couple of different custom cell types, each with its own custom view. Some of those cell types start asynchronous operations (playing and recording media, for example). I'd like to pause them when the activity they belong to goes away (which several other cell types can cause to happen). Is there any way to notify a particular view that the ListActivity to which it "belongs" is going away?</p> <p>My first thought was to iterate over the views in the <code>onPause()</code> method of the activity:</p> <pre><code>@Override public void onPause() { super.onPause(); for (int i = 0; i &lt; adapter.getCount(); i++) { CustomCellHolder holder = adapter./* Some magic goes here */; holder.handlePause(); } } </code></pre> <p>but I can't figure out how to iterate over the views owned by the list adapter. Is there a way to do that, or am I barking up the wrong tree?</p> <p>If it's relevant, my getView method looks something like this:</p> <pre><code>public View getView(final int position, View convertView, ViewGroup parent) { CustomCellHolder holder; if (convertView == null) { /* Create and cache a new view */ holder = newHolderForItem(someArrayListOfObjects.get(position)); holder.setItem(feature.attributes.get(position)); holder.setActivity(MyListActivity.this); convertView = holder.getView(); } else { /* Load a cached view */ holder = (CustomCellHolder) convertView.getTag(); holder.setItem(feature.attributes.get(position)); holder.setActivity(MyListActivity.this); } holder.doSomeStuff(); return convertView; } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBill Carey
    1. USBill Carey
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COIn my opinion, you're better off not having the view be responsible for doing any logic (playing/recording media). Refactor the code so that it's the Activity's responsibility which will make it trivial to pause the media in onPause.
      singulars
      1. POHow do I notify views owned by a custom adapter that they're going away?
      1. USgngr44
    2. COWhile that's certainly tempting, I will have a dozen or so different types of view (and corresponding holder/controller) in this activity, and possibly several instances of each type. I chafe at the prospect of placing all the logic in the (very long) activity instead of delegating the responsibility out to per-cell controllers.
      singulars
      1. POHow do I notify views owned by a custom adapter that they're going away?
      1. USBill Carey
    3. COIn that case, have you tried iterating through the children of your listview? Also, what adapter are you using?
      singulars
      1. POHow do I notify views owned by a custom adapter that they're going away?
      1. USgngr44
 

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