CODEWITHSUNDEEP
androidandroid-asynctask
Blake
Blake

Reputation: 7547

Calling execute() on an AsyncTask doesn't call doInBackground()

I have this code in the main Activity, where fetchxml is an AsyncTask:

String GroupID = PreferenceManager.getDefaultSharedPreferences(MainActivity.this).getString("GroupID","");
fetchxml.execute(GroupID);

and in the doInBackground(String... paras), it is:

protected String doInBackground(String...  paras) {
    Log.d("URL+ paras[0]", paras[0]);
    String xml = parser.getXmlFromUrl(URL+ paras[0]);
    return xml;
}

Why I didn't get any value in paras[0]?

Upvotes: 1

Views: 1006

Answers (2)

Luis
Luis

Reputation: 12058

Confirm that you define your class extending AsyncTask as:

private class Fetchxml extends AsyncTask<String, Integer, String>{ ...

The important part here is to ensure that the first parameter above is type String to be consistent with the value expected in doInBackground.

Also confirm that the String GroupID is not null.

Upvotes: 1

Marcin S.
Marcin S.

Reputation: 11191

When the value is null or it's empty String then Log.d won't show the tag either. Make sure that sharedPreferences returns a value. It seems that the key 'GroupID' doesn't exist and sharedPreferences returns default value which is an empty String ""

Upvotes: 2

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