Android :: Acitivity Managing - Always Starts New Instance Of Activity And Fetch Data From DB

Nov 17, 2010

I have been in problem of the Activity life-cycle. All though i read lots of docs on it put on getting clear picture on it. I have Activity A. In that activity I have menu options. If we click any option it opens the respective activity like if i click on 2nd button it opens Activity B Now again Activity B has same options into it. When user clicks on 1st button then i need to go back to activity A. So using this. Intent intent = new Intent().setClass(context, Articles.class); startActivity(intent); So always it starts new instance of activity and fetch data from DB. I want something like Activity A can be resumed back as it was.

Android :: Acitivity managing - always starts new instance of activity and fetch data from DB


Android :: Data Of Previous Activity Gone When New Activity Starts

Dec 30, 2009

I am developing an application in which the user require to register first and than got the user page. For that i have made layout and the layout consist many fields, so, i have made part of layout and also made the separate activity for the each layout. The layout like address, phone, etc... After that i have wrote the code for calling an activity and it works fine. It means when i press the "Next" button the another page will come and it will also consist some textview ,edittext and previous and next button. Actually, i want something different like -- When the user fill the first form and he will proceed to next, the content written by the user should not gone when the user press "Next" button. The content should be there which was written by user. And same way i have have 6 pages like that way to complete the registration process. So, have you any idea to solve above problem? I really need your help because right now i stuck at this point. So, please any body help me out of this problem. I would appreciate your help. I am waiting for your reply.

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Android :: Instance Variable Of Activity Not Being Set OnPostExecute Of AsyncTask - Return Data From AsyncTask

Jul 28, 2010

I'm trying to figure out the correct way to create an AsyncTask to retrieve some data from the internet and then to take that data and bundle it up in an Intent and pass it to a new activity(A list display). So in the first activity I just have an EditText and Button. In the event of an OnClick the task should be called and when it is finished the data should be bundled inside an Intent and passed to the next Activity. The problem is when I take the results from onPostExecute and set them to an instance variable of the main activity, that instance variable is still null when the task is complete. Here is the barebones version of the code:

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

When I debug the application I see onPostExecute does contain a valid PlacesList full of results, so why is the instance variable places set to null after the task is executed? I am going about "returning data" from an AsyncTask incorrectly?

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Android :: How To Get Calling Activity Instance From Called Activity?

Jul 9, 2010

I have a Contact Activity which is derived from ListActivity, which displays list of contacts, and on click of item, a new Activity Message Activity derived from ListActivity is initialized.Now I know, I can pack some information in Bundle and pass it before creating activity, but is there a way I can get instance of "ContactActivity" in onCreate method of "MessageActivity"?

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Android :: How To Fetch Market Data When There Is No API

Aug 20, 2009

As far as I can tell, there is no API (official or unofficial) to access information about Apps on the Android Market (info such as Title, Icon, Description, Downloads, Comments, etc..)

However, there are a few websites that have managed to compile this information anyway.

My question is: How is this being done?

A couple of guesses.

Manually (not likely, due to volume) Implemented the protocol used by the official app (by decompiling or observing packets) Running some kind of debugger with the official app to extract the live data Using some kind of automation + screen shots + text recognition (seems complicated) Modifying the (open) source to write a log file

I'm just curious how this was done because I sure can't figure it out.

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Android :: XML Parser - RSS Reader To Fetch Data

Sep 10, 2009

I have a doubt in XML parsing. I'm parsing a XML file. That XML file contains more than 14000 lines. I'm fetching 15 tag in that xml file. It is taking more than 7 times to fetch. Because 14000 lines * 15 tag. That much time it is taking. Any idea for this to reduce time. Or give some other coding to fetch xml data easily. No I'm using RSS Reader to fetch data as like in Java.

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Android :: Fix Super Glitchy Facebook App Keeps Saying It Can't Fetch Data

Jan 27, 2010

Ok so I've had enough of this Facebook app...it keeps saying it cannot fetch data because the connection resets. Even when I go on mobile facebook through the browser, it doesn't load. What's wrong with my Facebook app

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Android : Fetch Data From Database Like Mysql - Sqlite?

Nov 24, 2009

how to fetch data from database like mysql/sqlite

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Android : How To Fetch Data From Database Like Mysql / Sqlite

Nov 24, 2009

How to fetch data from database like mysql / sqlite.can any one help me in this,i have tried the examples gave in the NOTEPAD sample.its not working(it dont shows any errors.) can any one guide me in this ...

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Android : Phone Code To Fetch Data From Database

Aug 23, 2010

ParsedNotificationDataSet result = new ParsedNotificationDataSet(); Code...

here is my code to fetch data from database. according to me it works properly but at the very first time it will generate the exception java.lang.NullPointerException. after that it will runs very correctly. Will you help me what modification i will do to resolve this.

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Android :: Handle Existing Instance Root Activity Launching Root Activity From Intent Filter

Apr 3, 2010

I'm having difficulties handling multiple instances of my root (main) activity for my application. My app in question has an intent filter in place to launch my application when opening an email attatchment from the "Email" app. My problem is if I launch my application first through the the android applications screen and then launch my application via opening the Email attachment it creates two instances of my root activity. steps: Launch root activity A, press home Open email attachment, intent filter triggers launches root activity A Is it possible when opening the Email attachment that when the OS tries to launch my application it detects there is already an instance of it running and use that or remove/clear that instance?

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Android :: Get Instance Of The Activity?

Jul 9, 2010

Is there a way to get an instance of the activity that has called the currently running activity from the intent object that has been passed to it? eg. if A has called B, I would like to retrieve A's instance from the intent in B's onCreate method. As Activity is not Serializable i am not able to pass the instance in the extras bundle.

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Android :: Recover An Instance Of An Activity

May 9, 2010

I have a bunch of tab activities (which I implemented myself, didn't want to use the tabviews with activities inside them), so It's basically 5 activities calling each other every time the user clicks on the tabs displayed as a row of LinearLayouts at the bottom of the screen.

The thing is that the way I do it now, everytime the user jumps from one activity to another, a new activity is created and launched. Of course, I can see I'm wasting resources this way. So what I would like to do is to create every activity only once; and then if the user wants to go back to the previous (or any one that was already created and is probably paused) just check on some kind of list or array to see if the activity can be recovered and only in the case it can't; to lauch a new one.

My question is, how can I check this? should I save the intents? and how to recover the activities afterwards? I'm kind of new with java.

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Android :: Get Instance Of The Launched Activity

Jul 19, 2010

Is there any way to get the instance of a launched activity(or any view in that activity )of a application in another application.

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Android :: How Finish An Activity In This Instance

Aug 16, 2010

We all know that hitting the back button on the device doesn't kill the application, it merely finishes (destroys) the activity running on the foreground.

Well I have come across some code which helps me capture the back button signal so that I cannot exit the application. The only way to exit it in such cases is to press the home key.

Now this situation presents me with a unique disadvantage! The inability to kill finish the application on a time of my own choosing allows the application to keep running in the background like nothing has changed.

So in such cases is the task manager my only friend or is there a way for me to otherwise kill this application?

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Android :: Screen Rotation - Rotates That Doesn't Recreate Everything And Re-fetch Data And Process It Again

Jul 16, 2010

I was working on implementing a more advanced list view then the standard one they teach you in basic tutorials, and I did find a great tutorial explaining how to create your own Adapter and such not. http://www.softwarepassion.com/android-series-custom-listview-items-a...

I do have a working version of the tutorial and I am currently in the process of changing the list to suit my needs, but there are a few issues I am stumped on. If your run the tutorial code it creates a little progress dialog saying that it is retrieving data. In my application it is going to be fetching data from the internet and storing it in an ArrayList of custom objects. However if I where to rotate the screen the progress dialog pops up again, I have no clue on how to set it up so that when it rotates that it doesn't recreate everything and re-fetch the data and process it again.

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Android :: Push New Instance Of Main Activity?

Sep 2, 2010

Is it possible to create/push-onto-stack a new Activity of the same main Activity in an Android application with an argument passed to the Activities constructor? Specifically from a Dialog object...

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Android :: PendingIntent Always Creates New Activity Instance?

May 21, 2010

My app consists of an Activity and a service that runs in the background. The service periodically checks a website for an alarm condition. When the service detects the alarm, it should put a user notification into the status bar. If the user clicks the notification, it should display the app's activity. If the activity is already running, that activity should become visible. If the activity is not currently running, it should be created.

However the notification created by my service *always* creates a new instance of the activity, whether the activity is currently running or not. How do I get the desirable behavior?

Here is my service pseudo-code:

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

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Android :: Correctly Manage Activity Stack In This Instance?

May 28, 2009

I'm working to finish a small application, but I'm having problems seeing what combination of activity attributes and intent flags I need to achieve my intended application design. Trying my best not to describe the app in minute detail, here's the basic operation (I've supplied screenshots in the hope it makes sense easily): Users have a garden which contains flowers (GardenActivity).

http://www.tomgibara.com/images/daisy/garden/hut_screen.jpg

They can tap on a garden to see details of flowers (FlowerActivity)

http://www.tomgibara.com/images/daisy/garden/flower_screen.jpg

When flowers are fully grown a notification provided, tapping on the notification displays the garden containing the flower.

http://www.tomgibara.com/images/daisy/garden/notify_screen.jpg

Users can also use the GardenActivity as a picker to choose flowers to "exhibit" (ConfigureActivity)

http://www.tomgibara.com/images/daisy/garden/planting_screen.jpg

I want the app to operate so that if the user already has a GardenActivity somewhere in the stack (whether it's at the top, or underneath a FlowerActivity) the notification will alert the user by bringing that activity to the front (clearing any FlowerActivity that may be above it). I've tried using the FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP combination (without changing any activity launch modes) on the notification's pending intent, but it still launches a new GardenActivity, even if one is already available.

I've also tried using android:launchMode="singleTask" on GardenActivity. The notifications then seem to work correctly, but it prevents GardenActivity from returning any result back to ConfigureActivity.

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Android :: How To Tell A Thread From A Previous Instance Of Your Activity Has Finished

Oct 31, 2010

I'm writing a bitmap editor and I'm trying to write an autosave feature. When onPause is called, I write the application state to an autosave file. As this takes between 0.1s and 1.5s, I've been advised this IO operation be performed in a background thread.

In the onCreate method of my activity, I check to see if the autosave file exists and, if it does, I open it.

Are there any scenarios I have to consider where the user can somehow leave the activity, the autosave thread starts and the user can return to the activity before the thread has finished? If so, how can I detect this and wait for the thread to finish before I check the state of the autosave file?

I was going to make it that, when the user backs out of my activity, they're asked to wait a second while the data is saved. This seems OK, but I can't do this when my activity is interrupted by something like a phone call.

Also, I'm a bit confused about how multiple versions of the same activity can be started as this makes dealing with autosaving more complex. Is there a way to make sure only one instance of my activity is allowed to run at a time?

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Android :: Prevent New Activity Instance After Clicking On Notification

Jun 24, 2010

Application (non-wanted) behavior - application is started, some text is put into text-box and notification is created through button action. user "clicks" the home button, application is "minimized", notification is available in bar user selects the notification and the application is "maximized"

BUT - instead of the original instance, new instance is started (e.g. in the newest instance is missing the original text; when the latest instance is closed there is still the original instance with original text ) .

The code of the notification method

CODE:.....

I have also in the manifest xml file following tag android:launchMode="singleTask"

But it is still the same...The main problem is double/triple initialization of the application, i know that there are other means to preserve the values in resumed applications. Also it is needed that the applications stays running in background as the main functionality is the streaming of internet radio.

What is missing in the code ? What kind of information from my side is missing for to troubleshoot the issue ?

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Android :: Saving Cursor State With Activity Instance?

Apr 27, 2010

I've got an android app that pulls a random 20 questions (rows) as a cursor from a SQLite DB and loops through all the questions to ask the user all 20 questions.

Is there some way to save the cursor's state/location when the activity is paused or stopped so that when the activity resumes the cursor is restored and in the same position as it was when the activity was paused/stopped?

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Android :: AllowTaskReparenting - True Will There Be A Single Instance Of The Activity

Oct 4, 2009

Before asking my doubt, let me clarify my understanding of allowTaskReparenting...

Suppose there exists a Task (say Task 1) and this task has an activity (say Activity 1) which wants to call my Activity (say Activity 2). Let my activity (activity 2) set the attribute allowTaskReparenting to true and let my activity have a specific taskAffinity(affinity1). When Activity1 calls my activity (activity2), my activity becomes part of the task1. But suppose another task (task2) is already present/created with the same taskAffinity as mine (affinity1) and an activity in that task (say activity3) tries to start my activity, my activity gets re- parented to task2.

Not sure if i was clear enough. If i were to rephrase my words...

If my activity has allowTaskReparenting set to true and an instance of my activity is already present in task1. If task2 with the same task affinity as my activity tries to start my activity, the EXISTING activity gets re-parented from task1 to task2.

My quesions:

(1) Is my understanding correct ?

(2) If I am correct then a single instance of my activity gets shifted from task1 to task2. So 2 activity objects of my activity are NOT created.

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Android :: New Activity Instance Created For Every Intent-filter?

Feb 6, 2010

I'm using an intent-filter on URLs for my activity:

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

the launchMode attribute is set to "singleTop", but it looks like a new activity is created every time I click a matching url. I thought that if the activity is already alive somewhere, it would simply be brought to the front of my activity stack?

I tried this on the emulator/device, same behavior, a new activity instance is always created.

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Android : Single Instance Theme Of An Activity In Phone

Sep 7, 2010

I have two activities. A and B. A starts B. Both are running in the screen and both are visible. Say now B is visible.

On a special key press, I want to bring the A to the front and make it active. The problem I am facing is when the special key is pressed, another instance of A is launched and the new instance is brought to the front.

But I want the original A to come to the front. I want to make this change in the framework layer rather than application specific by using the singleInstance theme in the launchMode in AndroidManifest file.

Please help me in this regard as this is really urgent for me. Any inputs will be really valuable for me.

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Android : Inside TabActivity / How To Get Instance Of Current Tab Activity?

Apr 23, 2010

I have attached a menu to my TabActivity, and when a menu item is selected, I would like to do something different based on which view is being currently displayed in the TabHost.

int getCurrentTab() returns me the id of the current tab... but from that int how can I get the instance of the activity running?

I also tried getCurrentView(), getCurrentTabView(), but these return things I can't seem to cast to the class of the current activity.

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General :: App For Managing Background Data Efficiently?

Apr 15, 2012

I'm looking for an App which allows efficient control of the 'Restrict background data' checkbox on a per-App Basis.

In ICS today I can navigate
Settings -> Data Usage -> "someAPP"

And then check/uncheck the 'Restrict background data' checkbox to make the data traffic explicit for me: If I don't use "someAPP" I can expect that there is no background data traffic generated by "someAPP" (no extra cost in roaming mode).

I do have some apps (e.g. a pushmail app for company mails) which I always want to allow the use of background data in order to get my mail.

Other's (e.g. use of gmail, G+, etc.) I want to toggle the behaviour very quickly:

If I'm in 'roaming' mode: disable, if in my home-network with flat cost: enable.

This is the reason I can't use the 'Mobile Data' switch.

Today I navigate as shown above, which is cumbersome and likely to be incomplete. I think of an app, where you can compose a list of apps (from the installed ones) and enable/disable 'restrict background data' for apps on this list with one click.

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Android :: Activity Starts Remote Service

Oct 8, 2010

My initial activity is basically a splash screen while preforming initialization and login in to network server. To save memory I want to finish() the splash activity once it starts the main menu activity. I still want the remote service to operate. Testing shows it does. But am I going to get into trouble doing this? I know I can restart the remote from the main menu activity but I am trying to save overhead by not starting it twice. The remote service is required by the splash activity.

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Android :: Best Way For Service That Starts Activity To Communicate With It

Feb 16, 2010

I have a service that listens to a socket. When receiving certain input it is to create an activity. When receiving other input, it is to kill this activity. I have struggled for a while to make the service communicate with the activity through AIDL (http://developer.android.com/guide/developing/tools/aidl.html), but this seems to not be effective. I think AIDL is only effective when the process that is to be talked to is a service, not when it is an activity? I would love some directions or suggestions on how to solve my problem.

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Android :: How To Find Out When Activity Starts Or Get Focus?

Mar 17, 2010

I would need to know when one activity starts or get's focus. I need this notification for any activity regardless of his type, name or whatever - not searching for one specific activity. Checked the ActivityMonitor and the Intent and I haven't found a generic intent for this purpose. Or I hadn't understood well the descriptions from the Intent ACTION_xxxxx.

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