Question

I am creating an app, when you log in with user name and password, it requests the info from the server.
The server’s request takes time (15-20 sec), meanwhile I want to show a spinning bar with few words.
But I tried so many variations of the AsyncTask class, and I can’t get it to work. It gets the information okay, but freezes the screen until the response.
Right now I just have a new thread implementing runnable. I’m not sure from where in the code I need to call the AsyncTask .

The onClick triggers the attemptLogin() function:

    public void onClick(View view) {
        attemptLogin();
    }

In attemptLogin() function:

// more code
showProgress(true);
new Thread(new GetServerResponseRunnable()).start();
while (wait) {}
// more code

And the Runnable is:

public class GetServerResponseRunnable implements Runnable {
    @Override
    public void run() {
        response = getInfo.getTours(mUsername, mPassword);
        wait = false;   
    }       

}  

Which as you can see call another function from a different class.
This is the function:

public String getTours(String username, String password) {
    String req = "GETALLDATA";
    String retStr = "";
    try {
        url = getURL(req, username, password);
        sendOutputLine(url, "");
        retStr = getReturnString();
        Log.d(LoginActivity.DEBUG_TAG, "getTours() return: " + retStr);
    } catch (Exception e) {
        Log.d(LoginActivity.DEBUG_TAG, "programm bommed client: " + e.getMessage());
    }
    return retStr;
}   

I need help, please. Mainly what I want to do is:

    response = getInfo.getTours(mUsername, mPassword);
    wait = false;

And show the spinning bar meanwhile.

Thanks

---

Update: 02.13.2013

I used this code, but I got a

02-13 09:07:16.142: E/AndroidRuntime(1046): java.lang.NullPointerException

in the line:

this.dialog.setMessage(getResources().getString(R.string.login_progress_signing_in));

Any idea why?

public class LoginTask extends AsyncTask<Object, Void, String> {

    public Context context;
    public ProgressDialog dialog;


    public void BaseTask(Context context) {
        this.context = context;
        this.dialog = new ProgressDialog(context);
    }

    @Override
    protected void onPreExecute() {
        this.dialog.setMessage(getResources().getString(R.string.login_progress_signing_in));
        this.dialog.show();

    }

    @Override
    protected String doInBackground(Object... objects) {
        String name = (String) objects[0];
        String password = (String) objects[1];
        String response = getInfo.getTours(name , password );
        return response;
    }

    @Override
    protected void onPostExecute(String response) {
        if (dialog != null && dialog.isShowing())
            dialog.dismiss();

        LoginActivity.response = response; 

        // process response as you need
    }
} 

Answer 1

I think you need thomething like this

public class LoginTask extends AsyncTask<Object, Void, String> {

    public Context context;
    public ProgressDialog dialog;


    public BaseTask(Context context) {
        this.context = context;
        this.dialog = new ProgressDialog(context);
    }

    @Override
    protected void onPreExecute() {
        this.dialog.setMessage(context.getResources().getString(R.string.loading));
        this.dialog.show();

    }

    @Override
    protected String doInBackground(Object... objects) {
        String name = (String) objects[0];
        String password = (String) objects[1];
        String response = getInfo.getTours(name , password );
        return response;
    }

    @Override
    protected void onPostExecute(String response) {
        if (dialog != null && dialog.isShowing())
            dialog.dismiss();

        // process response as you need
    }
}

Call this taks

public void onClick(View view) {
    new LoginTask(YourActivity.this).execute(name, password);
}