Android :: Service Change Values Of Variables And UI Textfields Of Activities
Oct 20, 2010
I have an application that get/send data from/to a remote DB on internet.
I need to get my application working in background mode, then i supose that i have to put all the send/get remote data in a service..... but.... How can this service change values of variables and UI textfields of my activities? i can't find any information about this, all the tutorials i am finding are of simple services that doesn't do something like that.
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Dec 1, 2009
I have been facing problems to manage statics variables used in my android application. If we exit the application against a particular event (touch or key event -which is must for my app), all the statics variables are retaining the values when I am launching it again. I am invoking Activity.finish() method for termination . I know there is a collection type class available called Bundle and we can use it to save the states of all the statics and get those back when again creating the same activity during relaunch, but it would be a hard task if we want to port some j2me applications to Android because of having thousands of statics variables. Is there any way to kill the application completely including all the statics variable used there?
I tried with System.exit(0) and it works well for Android G1 and G2 (tested in firmware 1.6). But in Android Robyn (prototype) the same causes a major defect ("Activity not responding" popup apears just after exit) and I came to know from android dev forum that calling System.exit(0) is not recommended for termination of an activity.
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Jun 9, 2010
I'm kinda noob to android so please bear with me. I'm currently developing app which uses tabs. My question now is: how to store values of variables so I can access them on the other tabs? I want to create something similar to sessions in PHP where I can save variables on one page and access on the other.
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Oct 12, 2010
How can I make a variable or object available to multiple activities or restarts of the same one.
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Dec 31, 2009
Is there any reason not to use the Application class to share variables across Activities? For instance a handle to the DB or a single HttpClient.
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Jun 23, 2010
I'm sharing some variables accross activities by using a class like this :
CODE:..........
Then I'm using these variables anywhere across my multiple activites with ...if (Globals.hint2_stockview_valuation == false) {....}
Pretty basic and it was working fine untill ...
I introduced some webview stuff like this:
CODE:...........
And here's the News_Webview.class:
CODE:............
The problem now is that, when it "comes back" from this Activity, it looks like my Globals variables have disappeared ?
if (Globals.hint2_stockview_valuation == false) {
fires an error :
06-23 12:14:03.443:
ERROR/AndroidRuntime(2611): Caused by:
java.lang.NullPointerException
2 Questions then:
Should I use something else than this "Global" class to share variables across activities ? Is it just bad practice to do this ?? I know that I can use the preferences but I thought it was quicker to do it this way (no need to "read" the preferences everytime I start a new activity ...Should I "get back" my savedInstanceState in some way when my activity returns from the News_Webview.class ?
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Aug 30, 2012
how can I pass variables from service to activity and vice versa?
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Jun 6, 2010
Before I delve into it, I'm very new to Android and I have just started learning Java last month. I've hit bumps while trying to develop my first simple app. Most of these hurdles were jumped thanks to random tutorials online. MY CODE IS VERY MESSY. Any tips are appreciated.
The question above is quite broad, but this is what I want to do: It's a essentially a blood alcohol content calculator / drink keeper-tracker. Basic layout: http://i.imgur.com/JGuh7.jpg
The buttons along the bottom are just regular buttons, not ImageButtons (had problems with that) Here's some example code ..
It outputs the following to the text view: "Your BAC is -0.017". This is the Bac value for if StandardDrinks was still 0, so obviously there is some problem communicating between the classes.
The other elements of the formula (weight, time spent drinking, and the alcohol %'s and such) are variables because I will ultimately allow the user to change those values in the settings.
I've heard around the water cooler that global variables are not good programming style, but this is the closest I've come to getting it to work..
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Nov 21, 2010
I am trying to make an android widget like the Google Voice Widget where users can go through an array of Strings which is retreived from the SQLite database. The problem is using global variables in the widget provider. I need to hold the index of the value they are currently on in order to pass it to the intents which are created when the left or right buttons are created. The variable is always returned as zero though.
CODE:..................
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Mar 19, 2009
In my Android app, a Service runs in the background and logs GPS readings to a database. The user sees an Activity that presents them with radio buttons. I'd like to also log their currently selected radio button to the database. How can I access the radio button object from the Service?
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Nov 30, 2011
I'm building an app which connects to various web services via ksoap2. Most of the services provide some sort of response in the form of a string which I use in the app, however one of the services doesn't actually provide a response to be used it simply takes the inputted vales and the .net service updates the relevant DB tables.Would the set up and call to the service be the same as to the other services that I get information back from? My code is as follows;
SoapObject Request =
new SoapObject(NAMESPACE, METHOD_NAME);
Request.addProperty(
"Sub_Seq",Sub_Seq);
Request.addProperty(
"Start_Time",startDate.toString());
[code]...
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Dec 9, 2009
I'm having a problem in calling .net c# web services from android using ksoap2. The call is executed just fine without parameters, but when I pass parameters of any type, the web service just receives a null value. I tried everything possible but no luck so far. I hope someone can help, The client side code is:
public static boolean temp(){try {
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME_TEMP);
PopertyInfo p = new PropertyInfo();
p.type = PropertyInfo.INTEGER_CLASS;
p.setName("num");
p.setValue(5);
p.setNamespace(NAMESPACE);
request.addProperty(p);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope (SoapEnvelope.VER11 );
envelope.dotNet = true;
envelope.encodingStyle = SoapSerializationEnvelope.ENC;
envelope.setOutputSoapObject(request);
AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport (URL);
androidHttpTransport.setXmlVersionTag("<?xml version= "1.0" encoding="UTF-8"?>")
androidHttpTransport.call(SOAP_ACTION_TEMP, envelope); ....
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Jul 21, 2010
I am new to android applications, I am using Ksoap2 to access .Net webservice and The call is executed just fine without parameters. But with parameters I am getting Empty. I followed all the steps provided in sites. I tried everything possible but no luck so far.
private static final String SOAP_ACTION = "http://www.agilelearning.com/GetProvincelist1";
private static final String METHOD_NAME = "GetProvincelist1 ";
private static final String NAMESPACE = "http://www.agilelearning.com" ;
private static final String URL = "http://192.168.1.24/Service.asmx";
//Method executed when Province is selected
private OnItemSelectedListener selectListener = new OnItemSelectedListener(){
public void onItemSelected(AdapterView parent, View v, int position, long id){
try{
ArrayList districts=new ArrayList();
int Provinceid=position+1;//parent.getItemAtPosition(position).toString();
SoapObject request1 = new SoapObject(NAMESPACE, METHOD_NAME1);
request1.addProperty("Provincename","East Province");
SoapSerializationEnvelope envelope1 = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope1.dotNet = true;
envelope1.setOutputSoapObject(request1);
HttpTransportSE at = new HttpTransportSE(URL);
at.debug = true;
at.setXmlVersionTag("");
at.call(SOAP_ACTION1, envelope1);
SoapObject rs = (SoapObject)envelope1.getResponse();
int count=rs.getPropertyCount();
for(int i=0;i aa;
aa = new ArrayAdapter(home1.this, android.R.layout.simple_spinner_item, districts); aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sd.setAdapter(aa);
}catch(Exception ex){
MessageBox("No Districts found");}}
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Sep 4, 2010
I need to write a background service to get latitude and longitude values. I have an android application in which it has to find where the user is currently.So i seemed of getting the values of latitude and longitude values. Is there any way programatically to get the values from the system services or even program giving the values of lat,long is better for me. Any suggestions on this will be appreciable. I am in real help,so i am in fond of your suggestions soon.
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Jun 1, 2010
I have a service that listens to the serial port. According to data received from serial i switch between particular service states, and start particular activities on state transitions. I would like to accomplish it in following way: Let's assume there is one active Activity1 started from previous state, I call startActivity from service to start a new one Activity2, but I want to simulatenously destroy Activity1 when Activity2 gets on top of the stack. I tried to call finish() in Activity1.onStop but it seems not to work (Activity1.onDestroy() doesn't get called). I'd prefer to finish Activity1 after Activity2 gets on top in order to avoid blinking.
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Sep 11, 2009
I have a service that's running in the background, is there any way (short of keeping a count of onBind() and onUnbind()) to know the number of activities that are bound to it?
I am trying to provide a "quit" function. all my activities derive from the same base class. I am keeping a global static around that says the "quit" button was pressed. then on each of the activities onResume() method, I look for the global static "quit" variable and if it's set to true, I call "finish()" so my activity shuts down, and then next activity on the task stack appears -- which goes through the same process of checking the global static "quit" variable until it gets to the root activity -- which effectively goes back to the main desktop screen.
However, I need a way to reset the global static "quit" variable, otherwise, when I launch the app again, it will check the global static quit variable and shutdown immediately - never coming back up. So, I want to know if there are any activities bound to my service, if not, I would set the global static "quit" variable back to false so that the app could be relaunched again.
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May 19, 2010
I'm wondering which is the best way to communicate between a Service and an activity..
Broadcast intent
Callback
others?...
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Jun 5, 2010
I have an Android Service that I would like to keep running even after the last Activity has been popped off the stack, or the User has chosen to do something else.
Essentially the Service is listening for changes on a remote server, and I would like to generate a Notification if and only if an Activity from the app isn't running(or visible). In other words, I don't want the Notifications to occur while the User is directly interacting with the app.
In the case where the User is directly interacting with the app, the Service will notify the Activity and update appropriate UI elements based on the changes. I plan to implement this through the Observer pattern.
How can the Service know if none of apps Activities are bound to it?
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Aug 27, 2010
Android: i want to create service by extending a Service class which i start when application get started and all activities can share its state and when i want stop it from other activity and when i want start it again from any activity ?
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Jan 26, 2010
I am programming a game. I have a service for the background-music. When I press the home-button and leave my activities, the service still runs in background. How can I stop the service, when there is no more visible activity in my program and restart it, when the user goes back to my game (some activity of it)?
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Mar 13, 2010
Is there a way I can test if there are any other activities in my app still alive? I am looking to stop a service in an onDestroy method, but only want to do this if there are no other activities from my app still alive on the stack.
I have the call stop the service in the main activity's onDestroy() method. This works perfect EXCEPT that if a user launches my app, then launches a few activities in my app, then hits the home screen and RELAUNCHES my app, they will subvert my order and the main activity will now be above other activities of my app. From this state, if they hit the back button and 'back out' of my home screen they will trigger the onDestroy() method and kill the service even though there are other activities open on the stack. I want to avoid this by stopping the service ONLY if I am sure there are no other activities of mine open on the stack.
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Apr 3, 2010
I currently have a service called ConnectionService. It instantiates a Connection object that gives me access to a controller of TCP.
I start the service from a splash screen activity, which sends and intent and starts my "main" activity once a connection has been established. In the "main" activity, I can access my Connection object and communicate with the controller. However, when I start a new activity from the "main" activity and bind to the service, I get a NullPointerException when I try to call methods in the ConnectionService.
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Aug 29, 2010
I want to create an application to remote control my PC.
For example: Volume (get actual volume level, increase/decrease/mute volume), TVtime (start/quit tvtime, get actual channel, toggle fulscreen, channel up/down, toggle input source, toggle aspect ratio), Amarok (start/quit amarok, get current song, prev/next song, play/stop/ pause), etc.
The application for the PC is done (in python). The communication protocol used is very simple.
For example: "volume:get_level", "volume:up", "volume:mute", etc. Now I'm working on the android application.
What I have implemented till now is to create an activity, with: - an edittext to enter host:port - a button to connect/disconnect to/from server - the onCreate method creates a new thread for socket communication to send/receive messages to/from PC. - a textview to display information received from PC (eg. volume level) - a button to send command to PC I'm using handler to communicate between the tcpclient thread and the main activity.
It is working... But I want to use more than 1 activity. I want to use different activity for every program controlled. Searching for a solution to transfer the thread's handler to a new activity I have found that it is not possible, and I have to use a service.
So, my question is: how to send message from different activities to the same service, how to send message from service to the actual activity and how can I check in the service which is the actual activity? Because the service is running in the same thread as the activities I suppose that I still have to create a new thread for socket communication. How can I send the data received by the socket to the service?
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Aug 3, 2010
I have a service component (common task for all my apps), which can be invoked by any of the apps. I am trying to access the service object from the all activities, I noticed that the one which created the service [startService(intent)] has the right informaion. But rest does not get the informaion needed.
My Code is as below:
CODE:................
If I invoke startService(intent). it creates a new service and runs in parallel to the other service.
If I don't invoke startService(intent), serviceObj.getData() retuns null value.
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Jun 29, 2010
I'm trying to refactor/redesign an Android app. Currently, I've one UI activity (Activity 1) that creates a DataThread. This thread is responsible for network I/O and interacts (provides data) with the UI activity via a handler.
Now, I want to add another activity (a new UI screen with Video) - Activity 2. Activity 1 is still the main activity. Activity 2 will be invoked when the user clicks a button on Activity 1. Activity 2's data also comes from the DataThread.
My idea is to put the logic of my DataThread inside an Android Service (DataService). My question is - can more than on activity bind to my DataService at the same time? Is there a way to tell the service to provide data to a specific activity only?
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May 19, 2010
I'm new to Android development and am working on a small test project. I have a service, which communicates with an SQLite3 database, and two activities. A main activity which fetches database information via the service and displays it and a second activity which allows me to add data to the database via the service.
Currently, I have a singleton class which implements the ServiceConnection interface and I'm binding this to the service in the the main activity using the bindService function. Because it's a singleton, I can then use this service connection in both the main activity and second activity to work with the database and it all seems to work quite well.
However, I'm all the time aware that the service connection is bound to the main activity and I'm wondering if this is the wrong/bad way to do it? Would I be best off having two service connections, one in each activity, and binding each to the service?
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Jun 10, 2010
I have a class A which extends TabActivity and creates Activities B, C and D as tabs in its onCreate() function. Also, class A initializes another service handler class S which is responsible for establishing a connection to a service and implementing callback handlers for the service. Any of the Activities B, C and D should be able to receive events from the service and update accordingly. If I receive any event in class S from the the service then I want to call a function in Activity B which would be responsible to update the UI elements in Activity B based on the event received. You can assume that the user is in Activity B when the event arrives.
Can I call an activity function like the following in the stub handler for the callback in my class S -
CODE:................
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Nov 20, 2010
I have a local Service to which multiple activites needs to bind. In the first launched Activity, bindService returns true and onServiceConnected is called. But in any additionally launched activites bindService returns false, and I can't get a reference to my Service.
How can multiple activities simultaneously be connected to a local Service?
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May 3, 2010
Is there a significant difference in time needed for sending data over a service or by using an intent?
Are there general advices when to use service and when to use intents?
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Jan 15, 2010
I have multiple activities and one service.. In MainActivity I successfully connect to service (using a class what implements ServiceConnection + bindService() + startService()) but when i try to apply same method in other activity i see in LogCat a error... It Is possible to connect to service in an other way: something like to make static my CounterServiceConnection object in MainActivity and use it in the second one?
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