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POListView SimpleCursorAdapter Updated Asynchronously
 

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  1. POListView SimpleCursorAdapter Updated Asynchronously
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    <p>I have a class that has a SimpleCursorAdapter as a field. That adapter is used feed a listview that has a a viewBinder.</p> <p>I have an asynchronous task that runs that adds an entry to the database and then updates the cursor. </p> <p>In testing, if I click too quickly on the button that runs the async process, I get an error:</p> <pre><code>java.lang.RuntimeException: An error occured while executing doInBackground() ... Caused by: java.lang.IllegalStateException: database [path_to_my_db] already closed </code></pre> <p>The code WORKS perfectly - unless... the user clicks the save button rapidly in succession... I'm new to all of this, so any input would be greatly appreciated!</p> <p>Here is a stripped down version of what I'm trying to do:</p> <pre><code>public class MyActivity extends Activity { private DatabaseConnector connector; // this is my class for managing SQLite private SimpleCursorAdapter adapter; .... @Override public void onCreate(Bundle savedInstanceState){ ... myListView = (ListView)findViewById(R.id.my_list_view); String[] = new String{"This", "part", "is", "working"}; int[] to = new int[] {1,2,3,4}; // again, this is working... adapter = new SimpleCursorAdapter(this, R.layout.my_list_item_row, null, from, to); adapter.setViewBinder(new ViewBinder(){ ... // this is all working ... // the viewBinder is for custom date formatting... again, all works }); myListView.setAdapter(adapter); } private class MyAsyncTask extends AsyncTask&lt;Context, Void, ExerciseInstanceViewModel&gt;{ MyViewModel vm; // this viewModel has a cursor member... public MyAsyncTask([variables-all-working]){ } @Override protected MyViewModel doInBackground(Context... params) { connector = new DatabaseConnector(MyActivity.this); connector.open(); // TODO: Getting 'did not close database error here...' vm = connector.runMethodThatIncludesCursorInReturnType([input-paramters-working]); return vm; } // use the cursor returned from the doInBackground method @Override protected void onPostExecute(MyViewModel result){ super.onPostExecute(result); // set instance fields in outer class...; // set textView, progressBar, etc.. if (result.MyCursor != null) { adapter.changeCursor(result.MyCursor); } connector.close(); // aren't i closing the db here??? [Code to reload page with next detail items] } } } </code></pre>
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    1. USKevin
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    1. COWhy don't you simply make the Save button unclickable in onPreExecute() and make it clickable again in onPostExecute()
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      1. POListView SimpleCursorAdapter Updated Asynchronously
      1. USMohamed_AbdAllah
    2. COHi midoalageb - Great question, and I obviously wasn't clear enough in my original post. The button is titled 'Save & Next. After the data is saved, the view reloads with the next record in the list. It's like stepping through a list of customers and their orders. When the page reloads, the save&next button is clickable.
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    3. COTry using Synchronized statement to prevent multiple threads accessing the same variable at the same time
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