Android :: Service Object Availability Between Activities

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.

Android :: Service Object Availability between Activities


Android :: Sharing An Object Between Activities

Nov 24, 2010

I have a Weather app with four Activities. The main/launcher activity is 'invisible' using...

android:theme="@android:style/Theme.Translucent.NoTitleBar"`

Aand is simply used to do a few checks (whether this is a new install, whether a network connection is available etc) before firing off one of the other Activities. The other Activities are UI-oriented - two simply display weather data pulled from a website and the third to provide a location 'picker' so the user can choose which area to show the weather for.

However, all four activities make use of a WeatherHelper object which basically does everything from checking for available SD card storage to maintaining preferences and pulling/formatting website pages.

So, my question(s)...what is the best way to have one instance of WeatherHelper which can be used by multiple activities and where/how are best to create it in my case?

I've been an OO programmer for a lot of years but I'm very new to Android and the design concepts - I've read a lot on the Android Developers site over the past weeks but I've stalled trying to decide on this.

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Android :: Use One Object In Multiple Activities Within My App?

May 25, 2010

I need to be able to use one object in multiple activities within my app, and it needs to be the SAME object. What is the best way to do this?

I have tried making the object "public static" so it can be accessed by other activities but for some reason this just isn't cutting it. Are there any other ways of doing this?

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Android :: Pass Unparcelable Object Between Activities

Nov 17, 2010

I have an Object that I need to be able to pass between Activites. It implements Parcelable and I've written all the code related to that. The problem is that one of the properties of the Object is a Drawable - and really needs to be. Unfortunately, Drawable is neither Parcelable or Serializable. I don't understand how to pass it. The reason for having the Drawable is that I need to cache an Image that I've downloaded from the internet at runtime. I don't want to cache the images on the filesystem, since this would potentially end up using up a lot of space over time. I'm putting the image into a Drawable so that I can easily put it into an ImageView.

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Android :: Sharing Stream Object Between Activities Of Tab View

Sep 15, 2010

I want to share streams of a socket connection between the activities of a tab view. In particular the tab activity creates the socket and gets the i/o streams,so i want that tabbed activities use these streams to retrieve informations without reconnect to the server each time i switch from a tab to another. I know i can use the application class to have a global state, but i don't know how.

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Android :: Safely Pass Object References To New Activities?

Dec 8, 2009

I'm working on an application that requires non-serializable objects to be passed between Activities. The following page suggests using a HashMap of WeakReferences to accomplish this:

http://developer.android.com/guide/appendix/faq/framework.html

Is this solution safe? I know Activities are completely destroyed and recreated when the screen orientation changes. Couldn't those weakly referenced objects get GCed in the split second when the screen is rotated, since they wouldn't be referenced elsewhere at that point?

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Android :: Service Connection Object Is Never Triggered

May 26, 2010

I have followed the Local Service example provided by Google, but my Context::bindService(...) always returns false and there is Service Connection::onServiceConnected is also never called. I understand that Context::bind Service() returns immediately, but my Service Connection object is never triggered. I don't know if these apply My activity is running inside a tabHost and I was wondering if that can affect service binding in any way. The Service itself may have a problem, but I can call start service to the same service with the same Intent and it works as expected. Does anyone have experience with this? Please help me out.

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Android :: Want To Get Current Focus View Object In Service?

Nov 18, 2010

I want to get the current focus view in my Service to check the view is a EditText and append some texts in it (for all EditTexts, not only in my application).

I found some methods to do this, like Activity.getCurrentFocus() and Windows.getCurrentFocus(). But these methods are used in a Activity.

How can I use these methods in a Service? Or is there another way to do?

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Android :: Share An Object Between A Running Service And Activity?

Aug 8, 2010

I have an API Object that I made, and I would like to share it between a running Service and various Activities in my app, almost like if I was to make the class static. How could I go about sharing the created object between the two?

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Android :: Sending An Object To A Service Through Intent Without Binding

Feb 12, 2010

Is is possible to send an object to an Android Service through an Intent without actually binding to the service? Or maybe another way for the Service to access Objects...

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Android :: Managing Activities From Service

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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Android :: How Many Activities Bound To Service

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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Android :: Service - Communicate With Activities

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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Android :: Service - Not Bound To Any Activities

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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Android :: Service By Mean Share By All Activities

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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Android :: Keep FTP Connection - Or Any Connection Object - Alive Between Activities

Oct 27, 2010

I'm coding a very basic FTP client on top of my application and I have 2 activities. The first one is the file explorer and the second one is the image viewer. Once I click on the image filename on the explorer, I want to pass the connection to the other activity to handle extra stuff. Basically, I want to keep the same org.apache.commons.net.ftp.FTPClient object (which handles the connection) alive in-between the 2 activities. I know I can't pass an object inside an intent so I don't know what my best bets are.

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Android :: How To Test IBinder Object That Service Return On OnBind?

Apr 27, 2009

How to test my IBinder object that Service return on onBind ?

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Android :: Pass User Define Object Between Service And Activity?

Aug 21, 2009

I define a class Rect and a aidl file as below. code...

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Android :: How To Stop Service - When All Activities Are Finished

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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Android :: Stop Service Only When There Are No Other Activities In App Running

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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Android :: Using Socket In Service Communicating With More Activities

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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Android :: Multiple Activities Binding To A Service

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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Android :: Service Interacting With Multiple Activities

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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Android :: Bind Service To Multiple Activities Advice

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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Android :: Handling Events From One Service For Multiple Activities

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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Android :: One Local Service Multiple Binding Activities

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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Android :: Communication Between Activities - Intent Or Service - Faster

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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Android :: Want Connected To Phone Service Between Multiple Activities?

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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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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Android :: Background Service To Recode Different Activities And Upload On Server

Sep 9, 2010

I want to know that how i can get these things in android.Recording of Calls Appointment/Calendar Logging Bookmark Logging Browser History Logging Contact Details Location Through SMS SIM Change Notification and after getting these things in a file (.txt, xml, or CSV) how i can upload these things to my php server by running a backgroud service.Service will now prompt user again and again. Everything will be recorded silently and then user will see this information on server whenever required.

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