Android :: Activity Background Processing

Apr 17, 2010

"Note that when you write an activity, you can make it stop or continue running when it is moved to the background (see onStop() in Activity Lifecycle). For activities that download data from the network, it's recommended to let them continue downloading so the user can multi-task." As far as I was aware I had to create a service if I wanted to have a background activity such as a media player, internet download, or processing of data in files on the SD card continue when the activity was no longer in the foreground.I went and reread the onStop information on the "Activity Lifecycle" page, which was referred to.  But I didn't find any mention of how an activity might continue to run in the background after onStop was called.

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Android :: Droid Background Service Stops Processing Broadcas Events / Solve It?

Nov 6, 2010

I've a problem with my android application.
I'm using a background service (with notification on the status bar) which performs an audio sample every hour. To perform this sample I generate a broadcast event every hour and when I capture the event the audio recording starts. During the day, when I'm using the phone, I've no problems. The strange behavior happens during night, when it seems like if the phone goes to an "idle" state: the broadcast events are no more processed. From the log file I understood that the events are generated and putted in a queue... and when I start using again the phone, all those events are raised in the same moment.
Do u have any idea about how to solve this problem? How can I force the phone to continue processing my events? do I have to set any variable of flag to avoid the phone going in this kind of "idle" state?

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Android :: Start Activity When Main Activity Is Running In Background

Jan 10, 2010

I created an application which enables the user to set whether he wants to receive notification while the application runs in background mode. If the notifications are enabled an activity should be started (the dialog should appear on the screen).

I tried to enabled it the following way:

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

This is the method from main activity. When onPause() is executed isRunningInBackground is set true.
When I tried to debug it when the main application was running in the background the line

startActivity(intent) had no effect (the activity didn't appear).

Does anyone know how to midify the logic in order to start an activity from the main activity when the main activity is running in the background (after onPause() is called)?

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Android :: Activity In Background ?

Nov 19, 2010

Is there a way to 'preload' a user interfaces but to not display it until I am ready?

I have a service which has a receiver to listen for action_screen_on to occur. When that occurs, I would like to load an activity. However, as it is now, it takes about 1 second to load. I would like to preload the layout in advance so that when the screen is turned on the layout loads as soon as possible.

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Android :: Want To Change Background Of Activity

Jun 23, 2010

How to change background of activity and background of the application name at the top of your activity?

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Android :: Activity Background Becoming Black

Nov 19, 2010

i have set the background of an activity with a green gradient png image.This working fine almost always but some times during navigating to an activity its background is becoming black! i am not able to reproduce it with any specific operation, also not getting how to debug or fix it.

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Android :: How To Detect An Activity Goes Into Background

Aug 5, 2010

I need a way for my Activity to known that it's going into the background, and not when it's getting killed. I thought about hooking at onStop(), but onStop() is called for both cases. In other words, is there a way to tell if when my Activity is moving into the background and not getting killed?

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Android :: Background Tasks And Activity

Jul 14, 2010

Has anyone any idea on how to solve the generic problems related to starting a task in background from an activity and when the task is finished posting the result to the activity that created ? (the activity might get destroyed in the meantime due to a orientation change ,or receiving a call , or might be in the process of destroying and recreation)

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Android :: Start An Activity In The Background?

Aug 4, 2010

Is it possible to start an Activity in the background? I need such an Activity that can operate in the background and spawn other Activities as needed in response to user commands issued to my Home Screen widget.

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Android :: Changing Background Color Of An Activity

Jan 31, 2010

When i launch Activity A, the screen goes black, then dark-gray. Then A launches B, and the screen goes black and dark-gray again. Is there a way to set the default background color to black? Activity A has no screen, its just a stub that calls B.

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Android :: Activity Should Be Transparent / But Has Black Background

Apr 22, 2010

My use case is writing an overlay controller activity for a landscape camera preview. I followed the instructions from a couple of tutorials for writing a transparent theme.When I start this activity from my root activity, the layout gets drawn correctly, but the background stays black. I tried to use @android:style/Theme.Translucent instead, but this Theme inherits the orientation from the calling activity (landscape) and thats not what I want.The application holding the camera preview is set to landscape view as it does not display the preview correctly in portrait orientation. (see old google bug report)What I wanted to do was to put an independent activity for user interaction interface in front of the camera surface holder (this activity should be set to 'portrait', or even better to 'sensor')

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Android :: Set Solid Background To Spawned Activity

Sep 9, 2010

I'm not very familiar with the android SDK yet. I have an application (game), which is developed mainly using the NDK, and uses egl to render. i have an activity which handles the egl swapbuffer and runs the games native main loop, pretty straight forward I guess.

Now I have made another activity which host a TableLayout containing an EditText as well as a button (simply for text-input later used by the game). I spawn this activity from my main activity using startActivityForResult. The small problem I'm having now is that I can't manage to make this "popup" activity to have a background, so my paused game will reside in the background, with the various widgets just overlaid. This is not very pretty in my opinion, and I would like to at least have a solid background color for my spawned activity while it's active. I *could* just simply go into some state in the games main loop which clears the gl-screen just before I spawn the new activity. But I don't like this solution and it's a tad more work then I'm prepared to put in just at this time in the project. I'm pretty sure there is some simple way to just set a background color somehow, I just can't find *any* way to do it, I've looked around in the SDK resources and tried to search for any hints towards this, but i'm just not familiar enough with the java SDK to find what i'm looking for.

On a side note I would also like to be able to center the EditText widget as well as the button on the screen once the Activity is active, I haven't looked very deeply into it yet, but from a quick glance of the documentation I couldn't really find any suitable positioning methods in the tablelayout class. But as I said, haven't looked very hard. Can probably solve that one easy, but i'm just throwing this in as well :)

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Android :: Make Activity To Background With Out Finishing?

Jan 11, 2010

How can i make an activity go to background without calling its finish() method and return to the Parent activity that started this .I tried so much but it really dint help.So if you guys could help i would be very thankful.

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Android :: Child Activity Lifetime In Background

Sep 15, 2010

I have next problem, I have got parent activity and few sub- activities, if app goes to the background by pressed HOME button for long time, all children will be killed, and my app restart from parent activity.

For example: A1 - parent, A2,A3,A4 - sub-activities. A1-->A2-- >A3(top), from A3 I go to the background (HOME). wait 30-40 min and

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Android :: Get Background Color Of Activity In Java?

Sep 7, 2010

How can I get background color and text color (default for child views) of an Activity in Java?

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Android :: Activity Image Background Size?

Sep 12, 2010

I am a bit confused on creating an image which will be acting as a background for my activities. So, in short, my aim is that my application should be able to fit the different screen sizes. Therefore, what size in pixel should my three images be to be able to fill the screen of the device in ldpi, mdpi and hdpi?

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Android : How To Add A Background Image To Droid Activity

Oct 12, 2010

My goal is to develop a GUI application on top of a background image with buttons in specific places on the image. The first step is to display the background.

The image can be displayed with resources and is described in several FAQs including this one:

how-to-add-background-image-to-activity

It compiles and runs without errors, but the background is black. Here is the main.xml file:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/rootRL" xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background">
</RelativeLayout>

The image has been in png, 9.png, and jpg format with basenames of 'main' and 'background'. It builds but does not display. Making clean and recompiling does not help.

This behavior occurs on both the emulator and on hardware -- an Atmel AT91SAM9M10-G45-EK. The SDK version is 2.0.1.

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Android :: Start Activity From Service - Running In Background

Nov 13, 2009

I want to develop a application that continuously running in background as service. And after that if i press any numeric key, it should start an application.

I have developed a service which is running continuously. Is it possible in Android?

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Android :: Bring Activity To Front From Background Service?

Mar 17, 2010

I am aware my issue is against the philosophy of Android, but I have no choice, this application will run on a embedded car gps and I need to bring an activity to prevent from car accident, for example, when it's happen around the user. I have to put other activity on the back and bring my alert pop up without user manipulation like notification on the front. Is there a way to bring manually an activity to the front, by resuming it like when you click on the android task switcher?

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Android :: Update Information In Activity From Background Service?

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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Android :: Background Activity For Map Started Again When Orientation Change

Apr 6, 2010

i've developed an android app that's fetches an xml file and displays this data via several markers on the map. This works fine so far. The problem right now is that when i switch the orientation of the phone (portrait->landscape or vice versa) the markers disappear for a small moment, the xml processing is started again and then they reappear. Is there a way to prevent this re-loading of the file? It only takes about 2-3 seconds.

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Android :: SurfaceView - Does Not Show The Activity In Grey Background

Jul 27, 2009

1)Which is better for developing a game.

a)Using XML layouts 

b)Using Custom layouts with Surface view

2) while making a custom view using Surface view... do we need to have a secondary thread to implement the surfaceholder.callback()......

My code below does not show the activity in grey background as i have coded... do i need to use the unlockcanvas and all ,,but i havent used the secondary thread

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

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Android :: Bring Activity In Background To Front Via Notification

Aug 5, 2010

I create an application which displays the notification when the service starts.  If an user navigates to HOME screen (without exiting the application), the user could still go back to the previous application by pressing on the notification icon. This is very similar case as the track recording service in Google application "My Track".

I want the existing activity as Single Top activity since it has associated service running.  However when my application tries to bring the existing activity to front via notification, the existing activity's onDestroy has been called which causes problem. How can I skip this onDestroy method?  Here is my current codes:

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

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Android :: Broadcast Message Leave Activity In Background

Oct 31, 2010

My app's main activity listens to a broadcast message. When it receives the message it brings the activity to the front. I want to update the activity if it is in the front, so the user is playing with it, but otherwise I do not want to bring the activity to the front. How should I do it? Is there a flag for invoking the intent, or what?

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Android :: Activity.finish() With AsyncTask Still Running In Background?

Apr 28, 2010

What happens on Activity.finish() with an AsyncTask still running in background?

Does it just pop the Activity off the Activity Stack, but wait to destroy the Activity object until the AsyncTask fully completes (since the AsyncTask is an inner class of my Activity)?

Also, would it act any differently if the AsyncTask were a public, non-inner class that held no references to the instance of the Activity?

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Android :: Set The Background Color Of New Activity After Clicking Tabs?

May 28, 2010

I am switching activities on tab clicks and successful at this. But, in one of my Activity class I am doing the following:

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

I want to change the background of this layout only and I want tabs to their as it is. But with the currentandroid:layout_height="fill_parent"in main.xml my background is overwriting the tabs which means I am unable to see tabs. and If I makeandroid:layout_height="wrap_content"` I cannot see any change taking and tabs are still their.

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Android :: How To Set The Background Color Of New Activity After Clicking Tabs

May 28, 2010

I am switching activities on tab clicks and successful at this. But, in one of my Activity class I am doing the following:

CODE:........

main.xml has the following:

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

I want to change the background of this layout only and I want tabs to their as it is. But with the currentandroid:layout_height="fill_parent"in main.xml my background is overwriting the tabs which means I am unable to see tabs. and If I makeandroid:layout_height="wrap_content"` I cannot see any change taking and tabs are still their.

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Android :: Handle Background Threads When Leaving An Activity?

Oct 10, 2010

I need my Android app to save it's state to disk when its activity is put in the background or killed. It's been suggested that I start a thread when onPause() is called and perform any expensive I/O procedures there (see http://stackoverflow.com/questions/3894668/saving-loading-document-state-quickly-and-robustly-for-image-editor).

In what situations will the OS kill the thread and how commonly do these situations occur?

I assume it will be like how Activities are dealt with where the OS can arbitrary decide to kill the thread but will mostly only do this when resources are extremely limited. It would be nice to find some specific documentation of this though.

From playing around, with some test code, a background thread started in onPause() will run indefinitely in the background on my device (I tried loading lots of apps and couldn't get it to be killed).

For my specific app, I'm writing a bitmap editor where I'm using the Command pattern and the Memento pattern to allow undo and redo of edits. I'd like the user to be able to undo/redo their edits even e.g. the user gets a phone call and the activity is killed when it is put in the background. The best solution I can think of is to use a background thread to constantly save my command and memento objects to disk during application use and to finish up saving any objects that are left in a background thread if onPause is called. In the worse case, if the thread is killed I'll only lose some edits.

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Android : Bring An Activity To Foreground From Background Manually?

Oct 19, 2009

In my application i wait on socket for network events.On some events i have to bring activity into foreground(make activity as running) if at all it is not in the foreground.

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Android : Lifetime Of Background Parent Activity After StartActivityForResult()?

Jul 19, 2010

Is there an exception in the lifetime rules for a parent activity that's in the background after invoking startActivityForResult()? From my understanding, in low memory scenarios, the background activities are killed before the foreground. Does this rule still apply even if the background activity started the foreground one for the purpose of obtaining some result?

In this case, I think it would make sense for the foreground child activity to get killed first or to equalize the lifetime of the parent and child.

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Android :: How To Give Focus To A Background Activity Belonging To A Different Task

Aug 4, 2010

Say that the user has started my App and then switched off to use the Browser (so we have 2 sets of Tasks running). After a while, something happens to my app that requires the user's attention, so it posts a notification to notify the user. Is there a way to bring my App's task (and the Activity on top of the stack) out from the background when user clicks on my notification?

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Android :: Access Original Activity's Views From Spawned Background Service?

Jul 21, 2009

I have an activity called A, and on the selection of menu item 0, it spawns service B, which starts a runnable C in a new thread. I have a TextView in activity A, which I want to access in thread C.

I've tried making the TextView a public static field, but that generates the following error:...........................

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Android :: Pop Up Dialog Or Activity From Service Running In Background When Keyguard Locked?

Nov 19, 2010

I have an application in which there will be a service continuously running in background and on certain conditions service should call an activity or pop-up a dialog. I think this is possible. The question is, in case device keyguard gets on say after 2 minutes of idle time then will the service continue running in background. And what will happen when the condition of opening pop-up or Activity is reached.

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Android :: Activity Which Downloads Data In Background With Service - Doesn't Get Destroyed On Hitting Back Button

Nov 9, 2010

I need to develop an application with downloads the data at the background and update about the progress in the front.

I guess this can be achieved using services and activity and passing data in between the. But, what I need to do is even if I hit back button and then start the activity again. It should check if the service is running or not. If service is not running it should start one else it should display the data from running service.

Something like music player where music is played by a service at a background and activity displays the information. Even on browsing through other activities of the application or hitting back, state of the music player is maintained.

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Android :: Processing Raw Audio Data

Apr 10, 2009

I want to develop an app that lets one intercept raw audio data sent for playback (possibly by a different app), and apply audio enhancements over this raw data.Does Cupcake allow such filtering of audio data? If so, which API should I use? I understand this may not be possible at an application level for security reasons.I'm trying to see if this is possible with native code linking to public or private API of Android.

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Android :: How Does Touch Gesture Processing?

Dec 15, 2009

I want to know that android has a touchscreen requirement about hardware and software.And how does touch gesture processing where, for example, in driver layer or framework or application,

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Android :: Processing RSS Feeds With Namespaces

Apr 23, 2010

I'm trying to write an XML parser that takes an RSS feed & fetches the image urls shown in the url attribute of the <media:thumbnail> tag. This is all being done via android.Util.Xml, & is an adaptation of the code shown here. An example RSS feed that I'm trying to use is the BBC News RSS feed. However, media is an additional namespace & (probably) as a result my parser isn't working as it should. A version of my parse method is below. Is there any (no doubt simple) way to get my list of image URLs working?

..................

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Android :: WebView And Response Processing

Nov 8, 2010

Currently, I use a regular activity with some EditText fields as a registration screen in my application.The inputs are used to construct a soap message which is posted to the registration server, with the response being parsed to do some configuration of the application.I'd like to change this to have the registration page load in a WebView instance, so that the registration process takes place on an external web page.This would make it easier to make changes to the registration process without having to deploy a new build, as it would just be a matter of changing the web page that is loaded in the WebView.The question is would there be any way for me to get the response that is sent back from my registration server to the client? From what I can tell, if I went this route, there wouldn't be a way for me to parse the response like I currently do to initialize the application settings.

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Android :: Processing Events In SurfaceView

Jun 10, 2009

I am creating a custom Widget which extends SurfaceView and I am planning to use it for camera preview.In the main activity I tried to implement some event listeners but can't catch any event.If I press a button the LogCat outputs "Continuing to wait for key to be dispatched" line.Does anyone know how to implement event listeners in main activity using SurfaceView classes?

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HTC Incredible :: Way To Disable To Voice Processing

Oct 20, 2010

I migrated from AT&T/iPhone due to crappy coverage, and mostly like the Incredible.However, one area that it's pretty bad is voice quality.The reception is fine.I'm talking about the processing that the phone itself does (when using the handset itself as a phone) to attempt to make the caller at the other end more clear-sounding. It cuts out background noise but is too sensitive and often makes it difficult to understand the person on the other end of the line. When I put the phone on speakerphone mode or use it with Bluetooth in my car I don't seem to have this problem.it's only when I'm using the handset itself as a phone. When I've been on a single call I've tried switching between the three in my car when stopped, and I can always hear perfectly with the speakerphone or Bluetooth.when I use the handset is does that weird cutoff thing. I work in audio for a living and it's just like a bad noise gate.

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Android :: App Is Getting - Trouble Processing - Error

Aug 10, 2010

My android app was running ok under Eclipse, then I tried to add some GridView sample code from some online examples and now it will not build/run anymore.

I keep getting the major error:

CODE:..

Attempt to include a core VM class in something other than a core library.

I have never put anything to do with 'SocketFactory' in any of my code. I searched all of my code and can't find any code that I did that contains the SocketFactory.class.

I deleted my xml's and classes that I was working on that had to do with the GridView and reverted back to the code I had before, when it was running - but now I continue to get the above error. I even try to use 'Clean' but the error continues. Does anyone know what I should do about this error?

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Android :: Android Layout - Set Tiled Background To Fill Screen Behind Whole Activity

May 11, 2010

I'm new to android but I've been working my way through the tutoials. Still trying to get my head round layouts in a non-html world and was wondering how to achieve the following....

1) I'd like to set a tiled background to fill the screen behind the whole activity

2) I'd like to place a graphic and a button underneath it centred in the middle of the screen.

3) When the user clicks the button I'd like to start a new activity and presumably I have to do something to the current activity so the user can use the back button to get back to it.

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Motorola Droid :: Word Processing Apps?

Apr 22, 2010

Any good word processing apps in the market that might be compatible with Microsoft Word? I saw something in there for Office 2008 but it seemed like it was just like a tutorial on how to use the applications.

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Android :: Processing And Regular Input Apps

Oct 7, 2010

Processing has Android support and it seems to be pretty awesome from my 10 minutes of playing with it. But I would like to make a regular (nongraphics) application like a twitter feed reader or something. So is there something like Processing that can do regular apps? Besides Titanium.Basically I am looking for anything that will make coding for android easier, processing was so easy to get working that I was very happy with it, but it is for graphics only. Titanium didn't give me the same wow factor and it isn't open so that kind of takes away from it. What other tools are out there?

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