Accessing an Object from outside of AsyncTask

Question

I need to access an Object from AsyncTask. Here's the code of the AsyncTask:

private class DownloadTask extends AsyncTask<String, Void, String>{

    // Downloading data in non-ui thread
    @Override
    protected String doInBackground(String... url) {

        // For storing data from web service
        String data = "";

        try{
            // Fetching the data from web service
            data = downloadUrl(url[0]);
        }catch(Exception e){
            Log.d("Background Task",e.toString());
        }
        return data;
    }

    // Executes in UI thread, after the execution of
    // doInBackground()
    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);

        ParserTask parserTask = new ParserTask();

        // Invokes the thread for parsing the JSON data
        parserTask.execute(result);
    }
}

I want to access data. I have no idea how can I do it.

When you return `data` in `doInBackground` its used as input parameter for `onPostExecute`. So at the moment whats happening is youre passing `data` to your `parserTask` — Tim, Feb 14 '14 at 10:50
Why do you need it? result and data is the same string in your AsyncTask — nikis, Feb 14 '14 at 10:50
http://stackoverflow.com/questions/6053602/what-arguments-are-passed-into-asynctaskarg1-arg2-arg3 check this — Mohan, Feb 14 '14 at 10:56

user3301551 · Accepted Answer · 2014-02-14T10:51:45.403

One alternative approch is that you declare data variable with private static modifier and create a public static get Method. From the second activity can directly access that public static method.

private class FirstAcitivity extends Activity
{
    private static String data = "";

    private class DownloadTask extends AsyncTask<String, Void, String>{

        // Downloading data in non-ui thread
        @Override
        protected String doInBackground(String... url) {

            // For storing data from web service
            //String data = "";                                                    // Comment this line 

            try{
                // Fetching the data from web service
                data = downloadUrl(url[0]);
            }catch(Exception e){
                Log.d("Background Task",e.toString());
            }
            return data;
        }

        // Executes in UI thread, after the execution of
        // doInBackground()
        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            ParserTask parserTask = new ParserTask();

            // Invokes the thread for parsing the JSON data
            parserTask.execute(result);
        }
    }

    public static String getData()
    {
        return data;
    }
}

Now access in Second Activity

public class SecondActivity extends Activity 
{ 
    String data = FirstActivity.getData();

}

score 1 · Answer 2 · answered Feb 14 '14 at 11:01

1

You can also access it by declaring the variable as following:

 public static String data="";

Then you can access it in other Activity as:

 ClassName.data

where ClassName will be the name of class where you defined the variable.

answered Feb 14 '14 at 11:01

pratiti-systematix

792
11
28

While this is true answer but you shouldn't use public variable instead you should use private variable with public method, like I did. – user3301551 Feb 14 '14 at 11:03

Accessing an Object from outside of AsyncTask

2 Answers2