CODEWITHSUNDEEP
javaandroidandroid-asynctask
Richeek Dey
Richeek Dey

Reputation: 257

Make Asynctask return Cursor

I have written an Asynctask to fetch data from db and return cursor. However, when I call it in my main thread and pass it to a cursor, Android studio gives me an error. I've done all this as per the android dev docs, I'm unable to understand what I'm doing wrong.

Here's my asynctask:

public class FetchDataDay extends AsyncTask<DatabaseContract, Cursor, Cursor> {

    @Override
    protected Cursor doInBackground(DatabaseContract... params) {

        Cursor cursor = null;
        try {
             cursor = params[0].getSteps(System.currentTimeMillis());
        } catch (ParseException e) {
            e.printStackTrace();
        }

       return cursor;
    }

    @Override
    protected void onPostExecute(Cursor cursor) {
        super.onPostExecute(cursor);

    }
}

And here I am calling the task:

 public void initday() {

   Cursor cursor = new FetchDataDay().execute(databaseHandler);

// this line is giving me an error saying its the wrong return type. 

    if (cursor.getCount() != 0) {
        cursor.moveToFirst();
        do {
            //doing something with the data
        } while (cursor.moveToNext());
    }



}

Upvotes: 1

Views: 665

Answers (2)

Santu Reddy
Santu Reddy

Reputation: 87

Just put all the work of UI thread into your onPostExecute, it should work.

Upvotes: 0

ρяσѕρєя K
ρяσѕρєя K

Reputation: 132982

Cursor cursor = new FetchDataDay().execute(databaseHandler);
this line is giving me an error saying its the wrong return type.

As see here:

AsyncTask.execute(Params...) : method return type is void instead of Cursor type.

Use onPostExecute for updating UI According to doInBackground method result.

And if FetchDataDay is separate class then create a custom event listener using interface which will notify in caller class when onPostExecute method is called.

Upvotes: 2

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