Android :: Extending Application Class And Broadcast Receivers

Nov 1, 2010

In a book I read, the author suggests to extend the application class in order to have a place to be used as a singleton. In this way, it is easy to make some initialization stuff in it onCreate().Now my question: if my application has also some broadcast receivers declared in the manifest, and the application was not started explicitly, or it was but then the os reclaimed it resources back, what will be happening if the broadcast receiver is triggered? Will the onCreate of the application class be called first?

Android :: Extending Application class and broadcast receivers


Android :: Registered Broadcast Receivers After Application Is Killed?

Mar 25, 2010

Currently my application is configured to always receive the CONNECTIVITY_CHANGED action to force an update if the previous update failed because there was no connectivity. What I don't like about this is that the broadcast receiver gets to be called too many times although it is not needed. I was thinking to register my broadcast receiver only if an update failed using the Context.registerReceiver(BroadcastReceiver receiver, IntentFilter filter) method. But I'm not so sure if this is a good idea. I'm concerned that if my application is evicted from memory the broadcast receiver will be unregistered or lost and my application will not be notified about the future CONNECTIVITY_CHANGED actions. The update is done in a short lived service. So if the update fails, the service will register the broadcast receiver just before it ends its execution time. Can somebody explain what happens to my broadcast receiver after the application is evicted from memory?

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Android :: Run Multiple Broadcast Receivers For Same Intent In Same Application?

Oct 25, 2010

I'm working on a project where I need to run the BroadcastReceiver for a third party library for a specific Intent. I also want to run some of my own code when the Intent is broadcast. If I supply my own BroadcastReceiver for the same Intent, it seems that only, one or the other runs, but not both, depending on which appears first in the AndroidManifest.xml file. Is it possible to register multiple BroadcastReceivers for the same Intent in the same application and have them all run? AndroidManifest.xml snippet

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Android :: Using Broadcast Receivers

Sep 9, 2009

I had one question: Is it feasible to use a BroadcastReceiver as a glue layer between the user interface and the underlying business logic ? Example use case: Suppose i am maintaining the state of a call, and providing callbacks to the UI by invoking sendBroadcast with the relevant intent. Similarly, my underlying business logic can send broadcasts to the activity that has registered for receiving it on certain events ( like call connected, connecting, timed out etc).

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Android :: How To Use Broadcast Receivers?

Dec 30, 2009

Is it possible to use just a broadcast receiver without any activities? I just want to run some sample code only when the phone receives a call and nothing more. I use Log.d to write out but I don't see anything in the log. Am I missing something here? I also have permissions set in the androidmanifest.xml to allow for these type of intents.

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Android :: Dns Failing In Broadcast Receivers?

Mar 16, 2010

something weird just started happening. my app has a broadcast receiver which may access the network when invoked. the code has been solid for ages, but in the last few days it has started getting DNS errors on perfectly fine hosts. these are hosts which can be reached without problems in the main app or from other apps.interestingly i've seen another app get DNS errors too another app with a broadcast receiver.seems to affect all OS versions -- we have 1.5, 1.6, and 2.01 here. i don't have a Nexus to test 2.1, though. are there caveats to doing network inside broadcast receivers? i didn't think so, as ours worked fine until the time change [fx: twilight zone theme]

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Android :: Broadcast Receivers - Trigger Their Associates?

Apr 21, 2010

Can anyone give a hint if you know why there are some ACTIONS that do not trigger their associated receivers when they are registered in the manifest while they are received when they are register through registerReceiver() ? For instance, when I declare: <receiver android:name=".MyReceiver"> <intent-filter> <action android:name= "android.intent .action .NEW_ OUTGOING_CALL" /></intent-filter> </receiver> if the application is NOT running My Receiver is never invoked. But now, if I register the intent from inside a service, MyReceiver is invoked properly

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Android :: Difference Between Services And Broadcast Receivers

Jul 17, 2010

im trying to understand what the difference between a service and a broadcast receiver is,as i see it they can do the same thing.For example i have an application : App1 That provide a service called ToastHelloWorld which just creates a Toast and stopSelf(). expose it to other applications using an intent filter with the action name: "com.test.HelloToast"Now i have another application : App2 i want to implicit use a service with the action "com. test. Hello Toast" so i call startService( new Intent ("com. test.HelloToast"));and it works.Why would i use broadcast receivers when i can do everything with services and dont have the restriction of a 5sec execution limit?.I know most "system events" is exposed via broadcasts' but couldnt they just aswell be published as Service Intents?

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Android :: Bug Using Broadcast Receivers In App Widget Framework?

May 4, 2009

I started to implement my own App Widget using the example provided in the ApiDemos. In order to update the Widget efficiently I chose the Broadcast Receiver mechanism. In the ApiDemos there is this ExampleBroadcastReceiver which would (or should) react to changes related to TimeZone and Time as specified in the Android Manifest of the ApiDemos. I have debugged this Example using Eclipse and the Logcat output (provoking changes in TimeZone through the settings) and come to the conclusion that there must be some bug in the app widget framework. The only Broadcast Receiver that seems to work is the AppWidgetProvider itself. For instance I would expect something like: D/ExampleBroadcastReceiver intent=XY in the logcat's output after I have provoked the event XY. I have even tried without the 'enabled' option in the receiver's specification in the Android Manifest.

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Android :: App Widget Provider / Broadcast Receivers

Jun 28, 2010

The online android documentation says: Everything you can do with AppWidgetProvider, you can do with a regular Broadcast Receiver.So, what i want to do is to register via registerReceiver() another event other than ACTION_APPWIDGET_* on my Widget. For example ACTION_BATTERY_OKAY, is there any way to do this? Obviously i cant register the event from the onUpdate() code but i should do it using a service or something else. The problem is that im not able to find any reference to the Provider (AppWidgetManager only returns AppWidgetProviderInfo objects).

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Android :: Finding Which Broadcast Receivers Are Registered?

Jul 2, 2010

I have a program that monitors incoming SMS's, and I want it to monitor them full-time, so I registerReceiver with a Broadcast receiver that I've created. The problem is, if I want to unregister that receiver, I can't unless I know the original Broadcast Receiver class I registered. This is not a problem if I set it to stop when the program stops, but I want the receiver to keep running, only stopping when the user specifies. EDIT: Or is there a way of "Storing" the Broadcast Receiver class that I've created, such that when onDestroy is called it can be saved and when create is called again it can be pulled out.Is there any way of doing this?

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Android :: How To Set Priorities For Multiple Broadcast Receivers?

Jul 22, 2010

How to set a priority for multiple Broadcast Receivers when dealing with ordered intent broadcast?

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Android :: Design Approach - Web Service And Broadcast Receivers

Sep 23, 2010

I am developing an app for android mobiles that communicates with a json/rest web service. I need to make certain kinds of calls periodically to the server to check for some information. Within that context I might need also to query the GPS for the current position. I'm quite undecided to use a Local Service, since I don't know very well how to deal with them, in fact I need to retrieve those data periodically and refresh a MapView accordingly. I heard that I can use PendingIntents,in the service, associate this data as a payload and send them to a broadcast receiver which unpack the data and refresh the UI, I heard also that this is a bad design approach because of what broadcast receiver are intended to be used for.

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Android :: Broadcast Receivers Not Receiving Pending Intents

May 20, 2009

I've had an issue where no matter how I've tried to set it up I'm finding the Broadcast Receivers aren't receiving any Pending Intents. A look through LogCat confirms that the intents are launched, but they're not being executed. I managed to make a simple(ish) repro case. If you take the SimpleWiktionary widget by Jeff Sharkey http://code.google.com/p/wiktionary-android/ and make the following changes plus any required imports. Code...

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Android :: How To Capture Key Events From Intent's / Broadcast Receivers?

Oct 29, 2010

Is there a way to capture a key event from the Menu button using an Intent or Broadcast Receiver? Basically I want my app's Service to be activated when the Menu key is pressed.

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Android :: Use A Listview Without Extending ListActivity In Class?

Nov 9, 2010

I have an application with various tabs (on a tabhost), each tab is an activity that extends activity, and haves some textfields and things on it

now i need that my tabs have inside a listview, but in the example from android developer guide says that you have to extend ListActivity and not Activity

basically i need to merge these two tutorials:

http://developer.android.com/resources/tutorials/views/hello-listview.html

http://developer.android.com/resources/tutorials/views/hello-tabwidget.html

i want to know how can i use a listview without extending listactivity on my class

someone knows? code...

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Android : Pssible To Have Extending Intent Class?

Jul 28, 2009

I was experimenting with extending the Intent class but don't seem to make it work properly. I am wondering if extending is even possible. Here is the snippets.

Code for custom intent: Code...

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Android :: Capture OnMotionEvents With A Class Extending SurfaceView?

Aug 15, 2009

I'm new to android development so sorry if this is a stupid question.

The SurfaceView doesn't seam to have an onMotionEvent to override. Is there anyway to capture onMotionEvents with a class extending SurfaceView?

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Android :: Custom View Extending View-Class / Still Based On XML-Layout

Aug 17, 2010

I want to build my own custom view which should look like the Crysis-GUI.At first I designed a XML-based Layout and made it visible via the setContentView(int resid)-Method. Worked pretty well.But now I wan't to go a step further and draw in my Layout. So I created a new Class, let it extend View and overrode the onDraw()-Method. So far so good.But how can I still use my XML-Layout? I can't do setContentView anymore, so how could the same effect be achieved?

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Android :: Access Application Class From Class Other Then Activity

Sep 8, 2010

I'm new to Java and android development. In my application I need data which is accessible for a few activities. I've read that a good solution is to use Application class for this. So I use it like this:

public class MyApplication extends Application {
private String str;
public String getStr(){
return str;
}
public void setStr(String s){
str = s;
}
}

and I can access this variable from activity like this:........................................

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Android :: Custom ListAdapter Extending BaseAdapter Crashes On Application Launch

Mar 23, 2010

Data being pulled from a local DB, then mapped using a cursor. Custom Adapter displays data similar to a ListView. As items are added/deleted from the DB, the adapter is supposed to refresh. The solution attempted below crashes the application at launch.

CODE:................

Errors:

CODE:.........................

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Android :: Any Other Application As Broadcast Receiver?

Jul 29, 2009

I am broadcasting an Intent from an activity. Can we make another application as a receiver. So that it will get invoked when that specific intent is broadcasted.

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Android :: Broadcast Data To Other Application?

May 15, 2009

I create an application where i get the various data from net (say for example i am getting the temperature information of particular city and another data is the information of stock value of a particular company) now i want to broadcast that various data to all application. I create a registration process for diff application for diff data (EX app A is registrar for temp of city). so application is registrar for particular data will get that data.

How can i broadcast the information to all application which are registrar .

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Android :: Registering Broadcast Receiver To Run When Application Launched?

Aug 13, 2010

I want to run some code when an app is launched, so my broadcast receiver has to be notified when user open any app.

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Android :: Is This Systems Broadcast Ordered Or Normal Broadcast?

Aug 13, 2010

I'm trying to figure out if a system event broadcast is broadcasted using ordered broadcast or normal.The event is EVENT_REMINDER and in the source for the calendarprovider i noticed it sets up a alarmmanager to sent the broadcast. I can't find how the alarmmanager sends it. My guess would be as a normal broadcast , But while i was trying some things i noticed i could delay the system's notification (tried up to 10 sec) by building a sleep in my broadcastreceiver. This would indicate that they are handled ordered , and the systems receiver is only called when mine has finished. But can i be sure of this behavour?? (in all 1.5> sdk versions) the docs state that in some cases normal broadcasts are also handled ordered..due to spare of resources.

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Android :: How Can Write Broadcast Receiver That Will Be Invoked When User Clicks On Any Application Icon

Mar 18, 2010

How can I write a Broadcast Receiver that will be invoked when user clicks on any application icon?

I tried by writing:

CODE:...................

But it is not called.

I tried, by using Packagemanager I will get ApplicationInfo. From that I can know all the application starting activity name and package names. I thought I can use them to registerReceiver and my receiver will listen by its launching activity and package name.

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Opening Application Files From Broadcast Receiver

Jan 15, 2012

I could open the file input/output of my application through a broadcast receiver. Normally, I would use openFileOutput/Input(), but this can only be done through activities. Would it be more sensible to create my file in res/raw? or create an instance of the activity and call openFileOutput() on it?

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Android :: 'Application Class Stick Around

Aug 12, 2010

In my application, I use a subclass of the Application object to store some references to complex objects I need to access from all of my activities. When my app starts, the startup activity checks one of these references, in this case a Location, and if it is null, it starts the LocationListeners which populate the reference for further use.If I back out of the app to the launcher screen, and re-launch it, the Application object still has the reference from the previous use a few moments prior. This is fine, and is what I'd expect, but I'm curious how long the Application object is kept around once I've back'ed out of my application? (onDestroy() has been called on all activities, nothing in the stack.)When is it finally killed? I know it does finally get killed as when I've not used the app in a while, it will search for location on startup (indicating the aforementioned null reference.)

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Android :: Application Class Being Called Twice

Oct 16, 2010

In my Android application, I overload the Application class, and I updated the tag in my manifest. This application also creates an Android Service. I have put some logs in the onCreate of my Application class, and I see it being called twice. The first time is when my application gets launched (this is expected) and then, it's usually right after the Service is being created. the log also shows that a second instance of the Application is being created. (I print the "this" value and they are different). I thought the Application would be created as a singleton. Is that happening because I create a Service?

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Android :: Register Application Class In Manifest?

May 28, 2010

I have one Application class to keep the global state of my application. But I'm unable to register it in Manifest file? Any idea how to do this?

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