Real-time search using AsyncTask?

Question

I am writing an application that is looking for a database in real time. that is, when the user clicks the letters, he updates the list of search results.

Since the search may take some time, I need to do a background search and allow new keystrokes to restart the search. Thus, the user presses “a” (and the code starts searching “a”), then presses “b” - the code DO NOT wait until the search ends “a”, and then starts searching “ab”, Stop the search “a” and start a new search "ab".

• To do this, I decided to search in AsyncTask. Is this a wise decision?

Now - whenever a keystroke is detected, I check to see if I have AsyncTask working. If I do this - I am signaling this (using a boolean value in AsyncTask), it should stop. Then set the timer to re-check AsyncTask for 10 ms to check if it is complete and start a new search.

• Is this a smart method? Or is there another approach you would take?

TIA

Answer 1

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public void onClick() {
   if( searchTask != null ) {
      searchTask.cancel();
   }

   searchTask = new SearchTask( MyActivity.this ).execute( textInput.getText() );
}

public class SearchTask extends AsyncTask<String,Integer,List<SearchResult>> {
    private boolean canceled = false;

    protected onPostExecute( List<SearchResult> results ) {
       if( !canceled ) {
          activity.handleResults( results );
       }
    }

    public void cancel() {
       canceled = true;
    }
}

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