Android :: Activity With ProgressBar - Service - Update The Progress?
Dec 28, 2009
this is the current state/situation: I have an Activity which binds a Service which creates AsyncTasks which downloads various web resources. That works well, but of course the ProgressBar shows nothing. Previously i had an Activity which created an AsyncTask which downloaded some stuff. The AsyncTask got the View which holds the ProgressBar. So i could update the progress using onProgressUpdate and publishProgress. Obviously this doesn't work any longer because I have no reference to the ProgressBar.
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Jan 2, 2010
I have a service that downloads something from the Internet, it shows progress in notifications and in MyActivity (only when MyActivity is on foreground of course). How should the service post the progress to MyActivity? I know this could be done somehow with IBind but can I just simply do this in MyActivity:
MySevice.myActivity = this; startService(new Intent(....));
From MyService I can now call MyActivity's methods because I have a static reference to it in MySevice.myActivity, so I can call e.g. myActivity.sendProgress(63).
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Jul 29, 2009
I've been trying to get my progress bar view to work in my file scanner application, and I'm thoroughly stumped by the proper combination of Activities, Services, Threads, and Handlers. Here's the structure: My Activity contains a Horizontal-styled ProgressBar. On menu item click, I spawn a Service which, onCreate(), which is where I want to be able to update the progress bar. what am I missing?.............
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Mar 18, 2010
I am trying to create a simple Android application that has a ActivityList of information, when the application starts, I plan to start a Service that will be constantly calculating the data (it will be changing) and I want the ActivityList to be in sync with the data that the service is calculating for the life of the app. How can I set up my Activity to be listening to the Service? Is this the best way to approach this problem? For example, if you imagine a list of stock prices - the data would be being changed regularly and need to be in sync with the (in my case) Service that is calculating/fetching the data constantly.
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May 16, 2010
An application I'm building uses a local Service for downloading files from the web to the phone's SD card. In this app users can browse lists of books, and read them while online. A user can also download a pdf copy of a book for offline viewing. To handle downloads I'm using a locally bound Service. I do not want this Service to run all the time, only when downloading files. So that the Service can shut itself down when its tasks are complete, I am not binding to the service, rather I'm sending an "enqueue for download" command through the Intent passed to Context.startService.
Books available for download are shown in a list. A user can choose to download a book by clicking on its row in the list. On download, I need to show download progress using a ProgressBar on the actual book list row. I need to also show, on the rows, if a book is enqueued for download, or if its download has completed or failed. The books can be shown in different activities throughout the application--in search, or in the user's list of favorite books, for example. When the books are shown in different places, these are not the same objects, but they are uniquely identified by their bookId...............
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Nov 3, 2010
Is there any way i can update 4 activity UI from a background service? I have 4 activity with 4 image view, i want to update the image every 30 seconds. All the activity should be update together.
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Apr 28, 2010
I like to do some long running initializing work in a remote service, and during that, a progress dialog shall be shown. So basicly, I invoke ProgressDialog.show, run a oneway method of the service with a callback to be invoked when it's finished, and in the callback dismiss the dialog. I expected the service method to work in it's own process while the activity shows the progress dialog. But what happens instead (according to debugger and logs) is: ProgressDialog.show and service method invocation return immediately, then the service method is processed, and finally the progress dialog is shown for a few milliseconds right before it's dismissed. Even a "not responding" error might occur during that. If I invoke the service method in an own thread, which (as it's to be expected) is finished long before the service method is done, everything works fine. But I don't get why this is necessary. Why does a remote service method block the Activity thread? This even happens if the service method only does a Handler.post and returns immediately.
Simplyfied code overview: Activity: public void onStart() { startService(...); bindService(...);}
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Mar 30, 2009
My application involves doing some calculation on the first activity and sending the information to the second activity. So while the calculation is being done , I want to show a activity / progress / busy indicator on the first activity , before going to the second one. Is there any way of doing so, or an sample code that does the same. I was also looking out for the same by calling the calculation method after a delay so that the progress bar is shown first before the calculation is done , but this has also failed.
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Jan 6, 2010
I am having a tab Activity with 5 tabs with intents.the classes are used to load data from internet source.I need to show display progress bar while clicking each tab until it completes the data loading. or how to show a progress bar for a finite time after clicking the tab.
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Sep 26, 2010
can i keep progress dialog anywhere in activity? if possible then how can i do it?
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Feb 9, 2010
this button is shown on my start activity. After pressing it a new activity will be launched but this takes some time cause on initialization of that new activity some data is gathered from the Internet. This works half. The progress dialoge is shown but the progress wheel is not spinning.
Can somebody tell me why this happens?
Button b4 = (Button) findViewById(R.id.Button01);
b4.setOnClickListener(new View.OnClickListener() {
public void onClick (View view) {
final ProgressDialog pd = ProgressDialog.show(pak.this,
"", "Working..", true);......................
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Jul 16, 2009
I know that the following code should show and hide a tiny circular progress bar with the following code in Android:
CODE:.............
The problem is that I am using a TabHost and I need to be able to do this from one of the "child" activities. Is there any way I can go about doing this?
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Mar 24, 2010
This may be a simple question but i am a beginner ,i need your suggestion on this. i have two Activities A1 and A2 .When i click the image on A1 screen i have to display progress bar until A2 screen appears(A2 activity has huge task to do).
I tried:
CODE:...............
This couldn't display progress bar .I know that i am making a mistake but i couldn't figure out.
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Jun 17, 2010
I encounter a problem with a ProgressDialog in a PreferencesActivity in my application.What I want to do is pop up a ProgressDialog after the user has changed his username or password during the check on the remote server. In the onSharedPreferenceChanged() I call the ProgressDialog.show() method. Sometimes it works fine, sometimes not at all.
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Nov 14, 2010
I am developing an android application where I have a main-activity that contains a progress bar and a tabhost. the tabhost has 3 tabs.How do I from a tab-activity access the progress bar in the main activity? I want to be able to start and stop the progress bar when things changes inside each tab ativity.
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Aug 2, 2010
Whenever the memory needs to be reclaimed, the process is being killed by Activity Manager Service in killPidsForProcess. I have a back button in my activity window on right corner of the title bar.
I want to kill the activity completely on clicking the close button. Can I reuse the same function and will it have any major effect? Please help me out in this.
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Sep 10, 2010
I need to made an activity (without layout) that on start check if a service is running. if it is true it starts Activity2, if it false it starts Activity1.
I tried with this code:
CODE:............
Enter code here
But when I check, in the onCreate method, if serviceConnect!=null I receive sometime a NullPointerExcption.
I tried also to insert the operation in the method onCreate in an Async Task:
CODE:............
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Oct 18, 2010
I am trying to update TextView in my Activity with text messages from DatagramServer ( see below) The problem I have is that "backgound UDP server receives plenty of traffic, but onProgessUpdate is ever executed only once so only the first of the messages appear in the TextView.
public class MyActivity extends Activity {
TextView txtStatus; // txtStatus initialized
new BackgroundAsyncTask().execute();
public class BackgroundAsyncTask extends
AsyncTask<Void, String, Void> {
public static final String SERVERIP = "127.0.0.1";
// 'Within' the emulator! public static final int SERVERPORT = 2222;
private DatagramSocket socket;
protected Void doInBackground(Void... params) {
try { InetAddress serverAddr = InetAddress.getByName(SERVERIP);
Log.d("UDP", "S: Waiting for connection...");
socket = new DatagramSocket(SERVERPORT, serverAddr);
while(true) { byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
Log.i("telemetry server", " waiting for packet");
socket.receive(packet);
Log.i("received", new Integer(packet.getLength()).toString());
Log.i("UDPServer received:", new String(packet.getData()));
publishProgress(new String(packet.getData()));
} } catch (Exception e) { Log.i("Dbg server", e.getMessage());
} // end of try Log.i("Dbg server", "Dbg server: Done.");
socket.close(); return null;
} @Override protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
//it will never been shown in this exercise...
} @Override protected void onPreExecute() {
// TODO Auto-generated method stub
} @Override protected void onProgressUpdate(String... values) {
txtStatus.append(values[0] + " ");
} }
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Jun 30, 2013
In this example [URL]...I want add a activity that user can enter a URL of downloads(a add last url downloading) and show in this activity download information & progress bar & cancel button & resume.how to do it? Please show with example.
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Aug 21, 2010
There are several threads already on how to make custom layouts in the notification bar. The problem is I must be missing something simple.
I have a custom_notification_layout.xml. code...
What is the secret to actually updating the notification?
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Feb 25, 2010
I have a problem updating a progress bar.
First i have a custom adapter in which i create a row for each item with a textview and a progress bar. (i have a item_row.xml in where i define the layout for each row)
CODE:...............
Ok, now i have a service downloading in background data from an external API, and i want when to update the progress bar every second with the progress of the download.
For that, i have a timer task made with a handler (reference)
But the problem is how can i access again to the progress bars created in my adapter in order to update the progress?
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Jun 29, 2010
I would like to know if it is possible to get 'leftover' calls to AsyncTask#onProgressUpdate after AsyncTask#onPostExecute has been called? I am setting text on the same TextView using both of them, and I don't want to set text such as "Done!" and then have it overwritten at a later point by text such as "Almost there - 90%"Also, I am assuming that the onProgressUpdate method works similar to a SwingWorker method in that multiple calls to publishProgress may stack up before a call to onProgressUpdate occurs. I would really like to know where the "newer" and "older" progress updates are on the parameter - aka are the newest updates at position 0 in the parameter, or at position progress.length?
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Jul 27, 2010
In my android application, I am using the tab view and so I have two tabs: parameters and results. the user enters the various parameters on the first tab and then switches to the second tab to view the results. i have a service that performs some long-running calculations. the user enters parameters on the first tab and hits 'calculate'. They can make adjustments and hit 'recalculate' and the service is updated with the new parameters.
As these calculations progress, I want the user to be able to switch to the results tab to view the results of the latest calculation. They would then view the results and be able to switch back to the parameters tab to make adjustments. I can think of two approaches: register the 'results tab' with the service and when the service reaches a milestone, it calls directly to the 'results tab'. have a timer running in the 'results tab' and have it query against the bound service on a regular interval and update accordingly.
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Nov 20, 2010
I have created a activity and set a the title bar to contain a progress bar like this: this.requestWindowFeature(Window.FEATURE_PROGRESS);getWindow().setFeatureInt(Window.FEATURE_PROGRESS, 500);But it turns out to be a horizontal bar, how can I make this a spin bar? (without creating a custom title bar)
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Oct 15, 2010
Maybe quite a lot of SGSers are dying to know how the Froyo update progresses across the globe. I know about Sweden and Norway so far. Please let us know if the update appears in KIES in your country. It would be a nice extra if you'd publish your product code too.
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Aug 21, 2013
As you can see on the attached screenshot,when in full screen mode, the youtube's last update app won't show the progress bar, same thing happens on a galaxy tab 2 7"
GT-I9100
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Oct 4, 2010
I currently have a tab layout with 2 tabs, one tab with a list view and one with the option make strings so I can add them in the list view. Both tabs have their own activity because this made the code much more structured, and I dont have to repeat my self later.
Lets say im in the tab that offer me to create an string, and i press the update list button, how do I update the list view without startActivity()? If i use startActivity(), it starts List.java, and instead of displaying the list in the list view tab, it takes full screen, which defies the purpose of the tab view. In other words, the startActivity() steals the focus from the tab view of the list, and sends it fulscreen.
I want to update the activity in my list view tab, without starting a new activity that goes to fullscreen, and doesnt update the one in the tab.
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Nov 19, 2010
I have an Android activity that, onCreate(), will query a database and display the query results in textviews on the UI.The problem that I am having is at some point, users can open another activity and update the database. When they go back to the original activity, I would like for the text views to update with the new database information (so, I will re query the database and display the info).Another thing that I am willing to do is to take the new input from the user (in the new activity) and directly update the textview in the existing activity (without having the existing activity re-query the database). But I'm not sure how to do something like that either.Can someone please inform me on the best way to go about doing this? The only solution that I have found so far has to do with broadcast receivers, but I'm not sure if that is best suited for what I have to do.
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Feb 17, 2010
Suppose I have an Activity that's a list. It calls a Service when this Activity starts.The Service will do background stuff download, parse, and fill the list.My question is this: How can the Service communicate with the Activity?How can I call a method in the Activity, from the Service? (I'm new to OOP)
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Jun 12, 2010
In Virgil Dobjanschi's talk, "Developing Android REST client applications" (link here), he said a few things that took me by surprise. Including:
Don't run http queries in threads spawned by your activities. Instead, communicate with a service to do them, and store the information in a ContentProvider.
Use a ContentObserver to be notified of changes.
Always perform long running tasks in a Service, never in your Activity.
Stop your Service when you're done with it.
I understand that he was talking about a REST API, but I'm trying to make it fit with some other ideas I've had for apps. One of APIs I've been using uses long-polling for their chat interface. There is a loop http queries, most of which will time out. This means that, as long as the app hasn't been killed by the OS, or the user hasn't specifically turned off the chat feature, I'll never be done with the Service, and it will stay open forever. This seems less than optimal.
Long question short:
For a chat application that uses long polling to simulate push and immediate response, is it still best practice to use a Service to perform the HTTP queries, and store the information in a ContentProvider?
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