Android AsyncTask pass variable value

Question

How do I pass value on doInBackground so It can use it. When I type the String directly inside doInBackgroud it works. But I have three type "Professional", "General", "Special" I don't want to create 3 asyncTask. In my research i found that I need to create contructor but im don't get It.

    String type = "professional"; 


    new loadQuestioners().execute(type);

    public class loadQuestioners extends AsyncTask <String, Integer, JSONArray> {

    @Override
    protected JSONArray doInBackground(String... arg0) {

        //is the arg0 is the type i passed?

        return null;
    }

}

Jickson · Accepted Answer · 2014-11-02 17:16:08Z

1

Just modify the code as follows,

public class loadQuestioners extends AsyncTask <String, Integer, JSONArray> {

@Override
protected JSONArray doInBackground(String... arg0) {

    //is the arg0 is the type i passed?
    String yourType=arg0[0];


    return null;
}

"yourType" contains the type you passed while creating asyncTask

answered Nov 2, 2014 at 17:16

Jickson

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3 Comments

Majikero Gallardo Over a year ago

So if I have a new loadQuestioners().execute(type, type2, type3); String yourType = arg[0]; String yourType2 = arg[1]; and so on? Nc thx

Jickson Over a year ago

Then you can access them using the code, for(String type: arg0 ){ //do something with type passed }

Majikero Gallardo Over a year ago

w8 I try this in my project

Goran Horia Mihail · Accepted Answer · 2014-11-02 17:29:30Z

1

I can see two ways of going about this: 1st:

new loadQuestioners().execute("professional");

public class loadQuestioners extends AsyncTask <String, Integer, JSONArray> 
{
    @Override
    protected JSONArray doInBackground(String... arg) 
    {
        String word = arg[0];
        return null;
    }
}

And 2nd: create a constructor and pass the argument:

new loadQuestioners("professional").execute();

public class loadQuestioners extends AsyncTask <String, Integer, JSONArray> 
{
    private String word;

    public loadQuestioners(String word)
    {
         this.word = word;
    }

    @Override
    protected JSONArray doInBackground(String... arg0) 
    {
        //use word
        return null;
    }
}

edited Nov 2, 2014 at 17:29

answered Nov 2, 2014 at 17:21

Goran Horia Mihail

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3 Comments

Goran Horia Mihail Over a year ago

Sorry for the bad formatting, I'm posting from my phone.

Majikero Gallardo Over a year ago

No problem but making contructor inside Asynctask make me confuse because without contructor It seems it will work

Goran Horia Mihail Over a year ago

yes, both ways are correct and work, it's just a matter a preference. Personally I like the 2nd method more because I find it more readable than the 1st where you have to use the array index to access the parameters.

Nazgul · Accepted Answer · 2014-11-02 17:13:22Z

0

String... args means that it can take as paramrters:

a single String object OR
an array of Strings

So in your case pass an array of Strings to your async task's execute method and doInBackground will get them just fine. Inside doInBackground use the arg0 parameter as a String array and you should be good.

answered Nov 2, 2014 at 17:13

Nazgul

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