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Get all JSON response and then start another activity

I am doing socket programming and getting JSON response. Everything is working perfectly but the only thing that is getting me in trouble is that I start another activity before getting response but I want to get all response and after that start another activity.
Here is my code.
jsonobject1.put("username", edt.getText().toString());
jsonobject1.put("udid",
"A892E0AB-6732-4F42-BEFA-3157315E9EE4");
try {
socket.emit("setPseudo", jsonobject1);
socket.emit("findAllUsers", jsonobject1);
Log.e("TAG",""+ socket.getId());
Intent intent = new Intent(MainActivity.this,
MenuScreen.class);
intent.putExtra("onlineuser", onlineuser);
intent.putExtra("finduser", finduserjson);
startActivity(intent);
In my above code I am sending JSON data to server and getting JSON object in response. But before getting the response I am being sent to another activity. So I first want response and then start activity. Help me with some pseudo code.
Thanks

Create an AsyncTask class
public class GetJSONResult extends AsyncTask<String, Void, Void>
{
ProgressDialog pd ;
private Context _context;
public GetJSONResult(Context c)
{
_context = c;
}
protected void onPreExecute()
{
super.onPreExecute();
pd = new ProgressDialog(_context);
pd.setTitle("Getting JSON details");
pd.setMessage("Please wait...");
pd.setCancelable(false);
pd.setIndeterminate(true);
pd.show();
}
#Override
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
try
{
jsonobject1.put("username", params[0]); // params[0] is the value passed i.e edittext value
jsonobject1.put("udid",
"A892E0AB-6732-4F42-BEFA-3157315E9EE4")
socket.emit("setPseudo", jsonobject1);
socket.emit("findAllUsers", jsonobject1);
Log.e("TAG",""+ socket.getId());
}
catch (Exception e)
{
if (pd.isShowing())
pd.dismiss();
}
return null;
}
protected void onPostExecute(Void v)
{
super.onPostExecute(v);
try
{
if (pd.isShowing())
pd.dismiss();
}
catch(Exception e)
{
}
Intent intent = new Intent(MainActivity.this,
MenuScreen.class);
intent.putExtra("onlineuser", onlineuser);
intent.putExtra("finduser", finduserjson);
startActivity(intent);
}
}
Form your MainActivity call the AsyncTask like this
public MainActivity extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
// First get the reference to EditText using findViewById, then
String s = edt.getText().toString();
// Call the AsyncTask
new GetJSONResult(MainActivity.this).execute(s); // pass the edittext value to doInBackGround method.
}
}

private class getResponse extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("Loading...");
progressDialog.setCancelable(false);
progressDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
jsonobject1.put("username", edt.getText().toString());
jsonobject1.put("udid",
"A892E0AB-6732-4F42-BEFA-3157315E9EE4");
try {
socket.emit("setPseudo", jsonobject1);
socket.emit("findAllUsers", jsonobject1);
Log.e("TAG",""+ socket.getId());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
Intent intent = new Intent(MainActivity.this,
MenuScreen.class);
intent.putExtra("onlineuser", onlineuser);
intent.putExtra("finduser", finduserjson);
startActivity(intent);
}
#Override
protected void onCancelled() {
super.onCancelled();
progressDialog.dismiss();
}
}
and for executing new getResponse().execute();

Progress Dialog canceled before the task finished on another AsyncTask

I want to download stock from web using Web Service. Created Sync to delete current stock
new ResetStock().execute();
Here is ResetStock Async:
private class ResetStock extends AsyncTask<Void, Void, Void>
{
ProgressDialog pd;
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pd.cancel();
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
pd=new ProgressDialog(FrmMainMenu.this);
pd.setMessage("Please Wait. We are Downloading the Catalogue...");
pd.show();
pd.setCancelable(false);
pd.setCanceledOnTouchOutside(false);
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
DatabaseHandlerStock dbc=new DatabaseHandlerStock(FrmMainMenu.this);
dbc.deleteallstock();
dbc.close();
new AsyncStock(FrmMainMenu.this).execute();
return null;
}
}
Now I Called Another Async to download and xml and insert into my database
here is Asyncstock
List<Stock> mystocks = null;
Context mcontext;
int x=0;
public AsyncStock(Context context) {
super();
this.mcontext = context;
}
#Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
try{
URLConnection conn = new URL("http://192.168.1.2/mob2server.asmx/GetStock").openConnection();
mystocks = SAXXMLParser.parse(conn.getInputStream());
DatabaseHandlerStock dbc;
dbc=new DatabaseHandlerStock(mcontext);
String category, make, model, productcode, productname, smallimages, largeimages, description, mrp, unit, pkg;
for(Stock in :mystocks)
{
x++;
category=in.getCategory();
make=in.getMake();
model=in.getModel();
productcode=in.getProductcode();
productname=in.getProductname();
smallimages=in.getSmallimages();
largeimages=in.getLargeimages();
description=in.getDescription();
mrp=in.getMrp();
unit=in.getUnit();
pkg=in.getPkg();
dbc.addContact(new Catalogue(category.replace("$","&"), make.replace("$","&"), model.replace("$","&"), productcode, productname.replace("$","&"), smallimages, largeimages, description.replace("$","&"), mrp, unit, pkg));
}
dbc.close();
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return null;
}
#Override
protected void onPostExecute(Void result) {
Toast.makeText(mcontext, "Total " + x + " Models Imported!", Toast.LENGTH_LONG).show();
super.onPostExecute(result);
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
}
My First dialog is cancel before the stock is inserted into stock.
I want my dialog to be there until stock is inserted into my database.

Create another class and pack your second asynctask stuff in it. You can than call this new class in your first asynctask. Also use the progress update to see what is going on. In this way you will have only one progress bar but will keep you informed.

Difficulties with dispalying progressdialog

I need to display progrees dialog. It is quite simple, however I am absolutly required to wait untill asynctask will finish. That exopse some difficulties to me. To wait for completion of asynctask method .get() is used. But this method blocks my progress dialog.
So, how can I unblock progressdialog with get or what can replace .get()?
I am calling operation in a following way:
Operation o = new Operation();
o.execute(params);
try {
o.get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
class Operation
class Operation extends AsyncTask<String, Void, JSONObject> {
ProgressDialog pd;
Context con;
#Override
protected void onPreExecute() {
pd = new ProgressDialog(app);
pd.setOwnerActivity(app);
pd.setTitle("Идет загрузка...");
pd.setCancelable(true);
pd.show();
}
#Override
protected JSONObject doInBackground(String... option) {
/*
some job
*/
return json;
}
#Override
protected void onPostExecute(JSONObject result) {
super.onPostExecute(result);
pd.dismiss();
/*
some job
*/
}
}

Don't use .get() as you have seen it blocks the UI. You can use getStatus() if you need to check if the task is finished. Removing .get() should allow your ProgressDialog to show. If you have code that must wait until the AsyncTask is finished then put it in onPostExecute() or call a function from there
If you need to reference something in the MainActivity from the AsyncTask after it has finished, simply create a constructor to take a reference of your Activity and pass context to your constructor
Operation o = new Operation(this);
and reference it in constructor
lass Operation extends AsyncTask<String, Void, JSONObject> {
ProgressDialog pd;
Context con;
Activity act;
public Operator(Activity curAct)
{
act = curAct; // can use this reference to access methods in your Activity
}

try to use this way
private ProgressDialog dialog=null;
#Override
protected void onPreExecute() {
dialog = ProgressDialog.show(this, "", "Please! Wait...",true);
}
#Override
protected void onPostExecute(JSONObject result) {
super.onPostExecute(result);
dialog.dismiss();
// use here code
}

You might want to change your code to something like this.
Wrap the code you want to run afterwards in a runnable and pass it to your async task.
Runnable onEnd = new Runnable(){
//code to run after the task has completed
}
Operation o = new Operation(onEnd);
o.execute(params);
And here is the modified Operation class.
class Operation extends AsyncTask<String, Void, JSONObject> {
ProgressDialog pd;
Context con;
Runnable afterwards = null;
Operation(Runnable afterwards){
this.afterwards = afterwards ;
}
#Override
protected void onPreExecute() {
pd = new ProgressDialog(app);
pd.setOwnerActivity(app);
pd.setTitle("Идет загрузка...");
pd.setCancelable(true);
pd.show();
}
#Override
protected JSONObject doInBackground(String... option) {
/*
some job
*/
return json;
}
#Override
protected void onPostExecute(JSONObject result) {
super.onPostExecute(result);
pd.dismiss();
/*
some job
*/
if (afterwards != null)
afterwards.run();
}
}
Note the afterwards.run() in onPostExecute.

Progress Dialog only shows up when the job is already done

I have a problem which I don't understand. I want to show a simple Progress Dialog in Android. So I created an AsyncTask and create the dialog in the constructor. I use the methods onPreExceution to initialise the dialog and the onPostExecute method I destory the dialog. So until now this looks total correct for me. But when I start the App on my Nexus 7 the dialog doesn't show up till the job is done. So it shows up for a half of a second at the end of the job... What am I doing wrong?
Thank you for your help ;)
public class ParseHTMLCodeNew extends AsyncTask<String, Void, String> {
ProgressDialog dialog;
public ParseHTMLCodeNew(Context context) {
dialog = new ProgressDialog(context);
}
#Override
protected void onPreExecute() {
//einrichten des Wartedialogs
dialog.setTitle("Bitte warten!");
dialog.setMessage("Die Kommentare werden vom Server geladen.");
dialog.show();
}
#Override
protected String doInBackground(String params) {
InputStream is = null;
String data = "";
try
{
URL url = new URL( params[0] );
is = url.openStream();
data = new Scanner(is).useDelimiter("//html//").next();
}
catch ( Exception e ) {
e.printStackTrace();
}
return data;
}
#Override
protected void onPostExecute(String result) {
//Dialog beenden RSS Feed ist fertig geparst
if (dialog != null && dialog.isShowing()) {
dialog.dismiss();
}
}
}
UPDATE
This is my new AsyncTask:
public class ParseHTMLCodeNew extends AsyncTask<String, String, String> {
ProgressDialog dialog;
private final OnCompleteTaskListener onCompleteTaskListener;
public interface OnCompleteTaskListener {
void onComplete(String data);
}
public ParseHTMLCodeNew(Context context, OnCompleteTaskListener taskListener) {
onCompleteTaskListener = taskListener;
dialog = new ProgressDialog(context);
}
#Override
protected void onPreExecute() {
//einrichten des Wartedialogs
dialog.setTitle("Bitte warten!");
dialog.setMessage("Die Kommentare werden vom Server geladen.");
dialog.show();
}
#Override
protected String doInBackground(String... params) {
InputStream is = null;
String data = "";
try
{
URL url = new URL( params[0] );
is = url.openStream();
data = new Scanner(is).useDelimiter("//html//").next();
}
catch ( Exception e ) {
e.printStackTrace();
}
return data;
}
#Override
protected void onPostExecute(String result){
onCompleteTaskListener.onComplete(result);
//Dialog beenden RSS Feed ist fertig geparst
if (dialog != null && dialog.isShowing()) {
dialog.dismiss();
}
}
}
And i am calling it this way:
new ParseHTMLCodeNew(this,new OnCompleteTaskListener() {
#Override
public void onComplete(String data) {
gData = data;
}
}).execute(url);
As i commented on your post, data has no value.

If you calling this code so:
String data = new ParseHTMLCodeNew(CommentActivity.this).execute(url).get();
Then you do not really see your dialogue because there is a blocking UI.
Method get() waits if necessary for the computation to complete, and then retrieves its result.
Call so:
new ParseHTMLCodeNew(CommentActivity.this).execute(url);
and the result of the work is handled directly in the AsyncTask.
If you need to transfer the data to the main thread, you should tell him that the task was completed.
Wat is the simple code, I just added OnCompleteTaskListener interface
public class ParseHTMLCodeNew extends AsyncTask<String, Void, String> {
private final OnCompleteTaskListener onCompleteTaskListener;
private ProgressDialog dialog;
public interface OnCompleteTaskListener {
void onComplete(String data);
}
public ParseHTMLCodeNew(Context context, OnCompleteTaskListener taskListener) {
onCompleteTaskListener = taskListener;
dialog = new ProgressDialog(context);
}
#Override
protected void onPreExecute() {
// einrichten des Wartedialogs
dialog.setTitle("Bitte warten!");
dialog.setMessage("Die Kommentare werden vom Server geladen.");
dialog.show();
}
#Override
protected String doInBackground(String... params) {
StringBuilder sb = new StringBuilder();
// your code here
try {
for (int i = 0; i < 100; i++) {
Thread.sleep(100);
sb.append(i);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
return sb.toString();
}
#Override
protected void onPostExecute(String result) {
// Dialog beenden RSS Feed ist fertig geparst
if (dialog != null && dialog.isShowing()) {
dialog.dismiss();
}
onCompleteTaskListener.onComplete(result);
}
}
And the example of a call
new ParseHTMLCodeNew(this,new OnCompleteTaskListener() {
#Override
public void onComplete(String data) {
Toast.makeText(CommentActivity.this, data, Toast.LENGTH_LONG).show();
}
}).execute("your_url");
Be careful, this code can produce errors when you rotate your Phone.
When Activity destroyed but task is performed:
- progress dialog will close and will not open again
- local variable to dialog or context is incorrect.
If the operation is performed for a long time can make it through the of the services?

I've wrote a code that get data from online database and populate that data in lisview here is the part of my code hope that help !
class LoadMyData extends AsyncTask<String, String, String> {
//Before starting background thread Show Progress Dialog
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getParent());
pDialog.setMessage("Loading. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
//Your code here
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting the data
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// In my case use my adapter to display the data in a listview
adapter = new MyAdaper();
list.setAdapter(adapter);
}
});
}
}

Progress dialog should be shown from UI thread
runOnUiThread(new Runnable() {
public void run() {
dialog.setTitle("Bitte warten!");
dialog.setMessage("Die Kommentare werden vom Server geladen.");
dialog.show();
}});

Unable to dismiss progress bar in AsyncTask

I want to load datas from a list to gridview with a loading effect using progressbar.Im getting items from a webservice.The problem i face is im unable to dismiss the progress bar even after showing the gridview.I can see the gridview with items but progress bar is still running .What am i doing wrong here.
private void testAsyncTask() {
Log.e("Im in testAsyncTask()", "");
new AsyncTask<Object, Object, Object>() {
#Override
protected void onPreExecute() {
progress_Dialog = ProgressDialog.show(a, "", "Loading");
Log.e("Im in onPreExecute", "");
// super.onPreExecute();
}
#Override
protected Integer doInBackground(Object... params) {
MenuService menuService = new MenuServiceImpl();
PartnerMenuServiceResponse partnerMenu = menuService
.getPartnerMenu();
jewellist = partnerMenu.getMenu().getMenuEntries();
Log.e("Im in doInBackground", "");
System.gc();
return 0;
}
#Override
protected void onPostExecute(Object result) {
// TODO Auto-generated method stub
// super.onPostExecute(result);asd
Log.e("Im in onPostExecute", "");
if (progress_Dialog.isShowing()) {
progress_Dialog.dismiss();
}
ShopGridAdapter adapter = new ShopGridAdapter(ShopGridActivity.this, jewellist);
AllJewelgridView.setAdapter(adapter);
adapter.notifyDataSetChanged();
//AllJewelgridView.setAdapter(new ShopGridAdapter(
// ShopGridActivity.this, jewellist));
if (AllJewelgridView.getCount() <= 0) {
MyAlertDialog.ShowAlertDialog(ShopGridActivity.this, "",
"No data found.", "OK");
}
progress_Dialog.dismiss();
}
}.execute();
}

#Override
protected void onPreExecute() {
progress_Dialog = new ProgressDialog(context);
progress_Dialog.setMessage("Loading...");
progress_Dialog.show();
}
EDIT :
#Override
protected void onPostExecute(Object result) {
Log.e("Im in onPostExecute", ""); <------ ARE YOU ABLE SEE THIS IN logcat ?
progress_Dialog();
}
It may possible onPostExecute() not called. So to confirm check logcat

You need to put some code in your AsyncTask
ProgressDialog progress=null;
progress=ProgressDialog.show(this,"title","loading..").show();//put this code in onPreExecute()
progress.dismiss();//put this code in onPostExecute()
for more ProgressBar while loading ListView (using AsyncTask)

You can write in onPostExecute method may help you.
if ( progress_Dialog != null) {
progress_Dialog.cancel();
}