I want to select and upload images from my sdcard of device using my application while it is selecting and uploading the image i wanted to show progress dialog and once uploading is complete dismiss the progress dialog but it should show the dialog until unless file is uploaded completely no matter what is the size of image.
Try using AsyncTask.
Show Progress dialog in onPreExecute()
Upload your image in doInBackground()
dismiss the progress dialog in onPostExecute()
The flow will be, first of all onPreExecute() will be called then doInBackground() will be called and when whatever task being done in doInBackground() will finish, onPostExecute() will be called. You can use this to achieve what you want.
You can use Service to perform long time operation.
We can use AsynckTask, Services, Intent Service etc for performing long running operation.
Related
I am trying to find a way to check whether a setText method that passes values from the database to the UI has finished and the value is visible on the screen.
How can I accomplish this? The sole purpose for this is for good user experience, I realize it takes afer seconds before the TextView is updated. So I want to add a progress bar and dismiss it when the TextView is updated.
Use AsyncTask .. execute your database query in doInBackground() and
update your UI in onPostExecute()
you can show progress bar in onPreExecute() and dismiss dialog in post
execute
I use a code that access HTTP service to receive login data, and before it, I tried to show a processing dialog, but it did not showed up. Then I tried to simply change the button label to tell the user to wait until data returns, but it also did not work. That's my code:
tryingToLoginDialog = ProgressDialog.show(this, "Por Favor Aguarde", "Efetuando Login...", true);
btn_Entrar.setText("Wait while logins...");
btn_Entrar.invalidate();
App.webService.Login(txtLogin.getText().toString(), txtSenha.getText().toString());
String LoginUserData = App.webService.getUserData(); /* this method freezes the app but do not crash it cause ThreadPolicy permit all*/
/* here some if's */
tryingToLoginDialog.dismiss();
btn_Entrar.setText("Login");
btn_Entrar.invalidate();
You should use AsynTask. This has 4 different method doInBackground() This method run in background(not in UI Thread) In your case you can do your networking stuff here and other three methods are onProgressUpdate(), onPostExecute() and onPreExecute() run in UI Thread So you can use these function to update GUI.
You were saying you want to show dialog so setup progressdialog in onPreExecute() and do your freezing stuff in doInBackground() and use other method according to your need.
See detail here
I am using progress dialog in my Asynctask class. I put progressdialog.show() on onpreExecte() method of asynctask and dismissing the dialog in onPostExecute. My problem is the wheel in dialog is stops after 2-3 seconds but my background process is working. Can anyone help me to solve this problem? I want to spin the wheel until the background process is over.
Check tutorials how to do asynchronus task in Android:
link
link
link
link
link.
And here are some other StackOverflow questions that are similar:
Progress dialog problem in Android
Progress Dialog on open activity
Progress Dialog while starting new activity
Android: Progress Dialog spinner not spinning
Updating progress dialog
android: showing a progress dialog
Just a guess, but it seems to me that starting the progress dialog INSIDE the AsyncTask causes the dialog to work on the AsyncTask thread, instead of the UI thread.
I suggest moving the progressdialog.show() to just before you call execute() in your Activity.
i am making lot of HTTP calls in my applications & switches between the views, now i'm handling the Http calls in a thread, but i want to make user to wait when the http request in progress. How to do this?. I just need to show a wait cursor or loading string.
You can use a ProgressDialog whit a Handler.
Android Progress Dialog Example
Android's indeterminate ProgressDialog tutorial
Cheers
I find the name a bit misleading, but you should show a ProgressBar while background operations conclude.
May be this will helpful. You have to make a background operation using thread concept like AsyncTask. Using this you can hide the actual work from the UI part. And AsyncTask will get unallocated after your operations are completed.
Create a subclass of AsyncTask
Use AsyncTask to do background work
Call onPreExecute() to initialize task
Use a progressbar with setIndeterminate(true) to enable the indeterminate mode
Call onProgressUpdate() to animate your progressbar to let the user know some work is being done
Use incrementProgressBy() for increment progressbar content by a specific value
Call doInBackground()and do the background work here
Catch an InterruptedException object to find end of background operation
Call onPostExecute() to denote the end of operation and show the result
I have an issue with my ProgressDialog object. When I show it first time, it is spinning, but after I dismiss it and show it again, the dialog is static, it it not spinning... Can you please tell me why? All of this happens in the UI thread. Thanks
are you doing any processing in the UI thread during the second show of the ProgressDialog? If so, you need to move the processing to a background thread. Otherwise, the progress dialog does not get the CPU to update(spin) itself.