I am trying to make a progress dialog that pop up while things are loading. I have figured out how to make dialog boxes appear and disappear and can change whats in them but I have multiple async tasks and want the dialog to appear when the first async task starts and then disappear when the last async tasks finishes.
Is there a way for the dialogs to know when all async tasks are complete for a given activity? I am having problems on how to approach this issue. Thanks for the help!
Here is a exact sample code which i used to acheive the same functionality.
public class LoginActivity extends Activity
{
public static String TAG = "Login_Activity: ";
private EditText usernameEditText;
private EditText passwordEditText;
private ProgressDialog progress_dialog;
private int taskCount = 0;
private void updateTaskCount(int value)
{
taskCount += value;
if(progress_dialog != null && taskCount == 0)
{
progress_dialog.dismiss();
}
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
usernameEditText = (EditText) findViewById(R.id.login_username);
passwordEditText = (EditText) findViewById(R.id.login_password);
progress_dialog = new ProgressDialog(this);
}
public void LoginClick(View view)
{
String URL = "http://SOME.com/api/Members?Username=" +
usernameEditText.getText().toString()+ "&Password=" +
passwordEditText.getText().toString();
progress_dialog.setMessage("Authenticating. Please wait...");
progress_dialog.setCancelable(false);
progress_dialog.show();
new AuthenticateUserFromServer().execute(URL);
updateTaskCount(1);
new NotifyWebService ().execute("some other url");
updateTaskCount(1);
}
protected void onDestroy()
{
progress_dialog.dismiss();
super.onDestroy();
}
@Override
protected void onPause()
{
progress_dialog.dismiss();
super.onPause();
}
private class AuthenticateUserFromServer extends AsyncTask <String, Void, String>
{
protected String doInBackground(String... urls)
{
return Utility.readJSONFromWebService(urls[0]);
}
protected void onPostExecute(String result)
{
// do other stuff
updateTaskCount(-1);
}
}
private class NotifyWebService extends AsyncTask <String, Void, String>
{
protected String doInBackground(String... urls)
{
return Utility.readJSONFromWebService(urls[0]);
}
protected void onPostExecute(String result)
{
// do other stuff
updateTaskCount(-1);
}
}
}
If you have multiple/separate classes for async tasks you can create a static utility class to keep track of and update count.
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