Android :: Configuration Changed And Destroying Activities
Jan 9, 2010
I read up on how Android handles "configuration changes" - by destroying the active Activity.The first question I really want to know from Android Team - why? I would appreciate an explanation on how the reasoning went, cause I dont get it =)In any case, the fact that it acts in that way puts us all, as I see it, in a world of pain.Lets assume you have a Activity which presents a number of EditText:s, checkboxes etc. If a User starts to fill that form with text/data and then changes orientation (or get a Phonecall), then all input the User made is gone. I havent found any way to preserve state. That forces us to make extremely painful coding to not loose all data.
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Nov 10, 2010
While working on orientation change I have found that the onConfigurationChanged is not getting called when changing the orientation from portrait to landscape.But when I am changing from landscape to portrait the method is getting called. Is it the correct behavior because the onConfigurationChanged should by called whenever we are changing the orientation. (android:configChanges="orientation")? I have also found one strange behavior or error, When we are changing from portrait to landscape orientation the string value is displayed correctly(automatically by android system) but when in am changing the orientation from landscape to portrait the same string is displayed(i.e the string in landscape mode).The expected behavior is the string id specified in the portrait mode should be displayed.Is it an platform bug or something wrong in my code/programming.
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Aug 14, 2010
I am generating the random numbers and do some functionality with that .but when i change the orientation new random numbers are coming.But I want portrait random numbers.For this give me some suggestions.
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Oct 23, 2009
I have an activity which pops up a Dialog box, to get some text input from the user. The problem arises when you switch orientation. The Dialog disappears, so I have added code to set and check flags in the savedInstanceState, meaning that the Dialog is displayed again in these circumstances.I know when the window is going to be closed, but can't find a way of closing it manually. I open it with alert.show();but there doesn't seem to be any corresponding alert.destroy() method or similar.Any ideas how I can manually close the dialog box without user input?
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Jul 13, 2010
I'm using advanced task killer to kill the tasks, and then it seems when i check back there are 12-14 apps open.It's destroying my battery. I used startup cleaner to clean up start up, hopefully that'll be useful. but i'm just trying to keep things as streamlined as possible, seems liek a lot of apps dont like to not be active
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Nov 23, 2009
Is there a way to keep an Activity in memory after the user hits the back button on it?ActivitySearch is used frequently in my app, however after the user starts it up, then hits the back button, it's destroyed, and the next visit to it requires it be built from scratch again.If after its first construction, I could just request it be paused instead of destroyed on the back button, then I could reuse it. Is there a sensible way of doing this?The only way I could think of reasonably doing it is to combine ActivitySearch with ActivityMainMenu into a single activity, and simply switch views when the user chooses search, but this is probably a bad design.
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Apr 27, 2009
I'm developing a game for Android. It's got a lot going on but is running reasonably smoothly. That is, of course, until the user touches the screen.While they're touching it, onTouchEvent is called (with action = ACTION_MOVE, x = 0 and y = 0) roughly once every ten milliseconds at what appears to be a fairly high priority, as it absolutely obliterates the framerate. As soon as the touch ends the framerate returns to its nice state.Has anyone encountered this? Is there a way to reduce the rate at which ACTION_MOVE events are generated, or to ensure that they're only generated when there is actual movement, or use a polling method that just gets the current location of the touch? Or even just a way to disable it entirely?
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Apr 26, 2010
I want to hide my app screen and then when the user clicks on the app again, I want to bring it to the foreground , but I want the app to maintain the screen that was pushed to background. Is there any way to do that right now?.Because when I try to hide my app, the surface of my app is gettng destroyed and so when I try to relaunch the app a new surface is created and my app status is changing.
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Jan 25, 2010
I am finding that performance degrades after one or more screen rotations, and I presume that this is likely to be because an App's main Activity is destroyed and recreated each time the screen is rotated and that my app must be leaking memory when that happens.I have read that, contrary to what one might expect, not all the objects created by an app's main Activity (or in classes called by that Activity) are destroyed when the activity is destroyed. Specifically, I think I have read (although I can't now find where) that if the View uses a large bitmap member object then the Activity's onDestroy() method should be over-ridden and the bitmap should be explicitly recycled.Are there other objects that need to be destroyed or removed when the Activity is destroyed? What about Listeners? Is there a comprehensive tutorial or guide on this subject?
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Sep 7, 2010
running with the moto droid - since the latest update, my phone is chronically opening apps every few seconds and it is destroying my battery. before the update, i would have to kill maybe 3-4 apps over an extended period of time. now it takes about 1 minute and i'm killing 10-15 apps. any reason for this happening? how can i fix it? it's getting annoying when my battery life is terrible. i don't know a whole lot about the phone.
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Jun 30, 2010
how to call BarCodeScanner, and return the value to a field.so now, i have a toast that says "successful scan" and then i want to pass the result to a new activity. when i comment out my intent, everything works (minus the passing of data/switching of screen, obviously) but when i run my project as is, it FC's no errors reported by eclipse in code or xml. any insights?
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Mar 26, 2012
I have a Vivid. Google contacts are set to sync. I also my outlook contacts using HTC sync (or MyPhoneExplorer). I used to have ~1300 contacts in Google. I now have 16. Everytime I restore my contacts, they are soon gone. I made a google contact yesterday and it is now gone. The destruction seems to happen when I sync with outlook.
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Mar 1, 2009
My service works exactly the way i want as long as i use start and stop and communicate using intents. However my activity needs to change the state of my service as well as retrieving state information.So i thought it would be nice to broadcast some kind of state_changed event from my service and use a binder interface to pull information from the service or change the services state based on user input.This works fine too. The only problem is that my service gets killed when i unbind it just as the documentation says.Is there any way to keep the service alive but still get an interface to control it directly. My activity offers the user a way to stop the service and the service kills itself anyway after it's work is done but i don't want the service to stop every time the activity is destroyed.
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Oct 6, 2010
I would like to know if the Android handsets can be configured Over-The-Air; in other words, if they can be configured for settings (such as GPRS , WAP or MMS ...) using OTA. If yes, do they support OMA CP provisioning? Is there an XML example that can be used to configure the Android devices?
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Nov 24, 2010
I have a simple Android application that loads a page in a WebView, then most of the real work is done by the server-side scripts. Everything is working great, except that I currently have the page URL hard-coded in the Android application, sort of like this:
mWebView.loadUrl("https://www.my-application-url.com");
This was fine until this morning when I was asked to to make it so that the user is prompted to enter the URL the first time the application run, and the URL that is entered by the user is then saved and used automatically by the application from that point onward. I was also asked to make it so that the user can change the URL if they choose to do so. The reason I was asked to do this is so that users can install the server side of the application on their own servers and my Android application will be able to connect without me having to write a custom version for each user, with their URL hard-coded into the application.
I am unsure what is the best way to handle this in Android. It seems that I probably need to add some type of configuration interface to the application that is shown by default on the first run, then only when the Menu button is pressed on the following runs. From this configuration interface I guess I would then get the URL from the user and serialize it for future use. What is the best way to accomplish this?
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Jul 19, 2010
I've only owned an Android for 6 days (Samsung Galaxy S i9000) and one of the first things I installed was Juice Defender, having used iPod Touch extensively, I know how heavy on battery things like WiFi can be. Anyway, JD makes the phone really really leggy. It can take a minute sometimes (literally, 45-65 seconds) for the JD screen to come up when launched. Similarly when waking from sleep it takes ages for the data connections to become active again. Have I misconfigured JD? Is it really this slow and creates this much lag? Does it just not like the (fairly new) i9000? I've just uninstalled it there right now (left Ultimate Juice on) and the phone is much snappier. It's like using it for the first time. Which, considering JD was installed in the first half hour of my owning the phone, it kind of is. What I really wanted was the WiFi on/off according to cell tower location data so I can have it go on and off when I leave the house. Guess it's no real biggie. Having limited background data (e.g. the 2 mins per 15) is handy too. Are there any other apps which have JD functions - even if more limited in scope - that I can try?
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Oct 4, 2010
Having some trouble getting handcent configured right. I want it to only show the notification in the top status bar and the dock. I do not want the popup window. Can someone tell me which settings to use? I have tried everything and cannot get it right.
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Aug 26, 2009
In Java ME we can set .jad configuration in description file and we can get this values in midlet by getAppProperti(""); So in Android we can set apk configuration (eclipse) apk configuration. But when I set this! my file default properties change and my projet signal some error. So in activity when can add System.setProeprty("name","values"). My problem I wan to specify the server IP and some code in apk only for this apk file. Each apk can have his code and server IP.
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Jul 10, 2010
I need to display a configuration screen when a user installs my application. Is this possible to implement? That screen should not appear again.
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Feb 16, 2009
How can I detect if the G1 keyboard is hidden or open at application startup? My app always runs in landscape mode, but I can only find how to detect keyboard configuration *changes* (through onConfigurationChanged()). So how can I retrieve the current keyboard configuration (open or closed) at application startup?
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Sep 29, 2010
I'm writing a widget with a configuration activity which calls the following method when its OK button is clicked:
CODE:..............
This is almost verbatim from the documentation. widget_id holds the widget ID that was dug up during the activity's onCreate().
When I place an instance of the widget on the home screen, I've verified that I get the expected sequence of events:
onReceive() gets an ACTION_APPWIDGET_ENABLED if it's the first one.
onUpdate() gets called (in which I detect that the widget isn't configured and draw something as a default action).
The configuration activity appears.
When I press OK, the ok() method above gets called.
The method gets all the way through to the finish() and the configuration activity goes away, but there's no call to onUpdate() or onReceive() after this point. (The widget itself has no updatePeriodMillis.) I end up with a widget on the screen that has the results of my default action but never gets updated.
If I set the widget up without a configuration activity, it gets updated when created and everything works as expected (just without the configured bits).
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Apr 8, 2010
I am still learning bu find Android the cool platform for allot of useful applications. I have written a Service for doing GPS tracking and it consists of a Service and a Control activity to manage, monitor and configure the service. I am looking for the preferred way for the Control Activity to define settings for the Service, things like IP address and Update interval. I envision something like a Registry on windows where these settings can be shares and updated.
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Oct 12, 2009
Where should I store my Android application's configuration settings? Coming from the .NET world I was expecting something like .config. Do I create a file under res/values, and use that?
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Jul 17, 2010
Smart-phones have built in ROM and RAM separately. Also a few phones has virtual memory support too. I would like to know what these memories are basically used for. I understand that RAM is available to user processes. But why do they have a big chunk of ROM? E.g. The wiki page for Droid Incredible says
512 MB DDR RAM
1 GB ROM (748 MB free to user) - what's this free to user?
plus 8 GB moviNAND - typically used for data storage
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Jul 25, 2010
What happens to the width and height params declared in LayoutParams on configuration change? E.g. if I have an ImageView declared with,
new LinearLayout.LayoutParams(30, 40);
On Configuration Change, does the width become 40 and height 30?
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Apr 15, 2009
I'm playing around with the new AppWidget API, I get the impression from the docs that I don't need an android:configuration attribute in my AppWidgetProviderInfo xml resource. Curiously though, when I try to add my AppWidget to the home screen, I just get a black textview that reads "Problem loading widget".
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Apr 7, 2010
The default way configuration changes (i.e., rotates) are handled is to destroy the activity & recreate it with a new one. What is the recommended way to handle these changes in an activity that binds / unbinds to a service (that is possibly heavy/slow to start)? When the activity gets destroyed, it unbinds & causes the service to be destroyed. When the new activity is created, it binds & recreates the service.
The only choices seem to be:
-- override onConfigurationChanged in the activity. Feels ok, but non - conformant.
-- explicitly start the service & only stop it when the last activity gets an onDestroy that's not due to a config change (i.e., there was no call to onRetainNonConfigurationInstance). Feels icky.
-- explicitly start the service & don't stop it until some amount of time after the last unbind. Ickier.
On a related note, what happens between activity switches within a process, where the first activity (A) starts the next activity (B) & then calls finish() -- is there a guarantee that B.onCreate is called before A.onDestroy? If not, and the activities share a service, the same issue of keeping the service alive during this window exists, but with only the icky workarounds.
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Aug 2, 2010
I have developed an App that talks to a set of web services. Because the App is used in different environments and for different purposes, I would like to provide a way to automatically deploy a configuration alongside the App that contains the settings for the environment (url of the locally hosted web services for example) and App settings (such as a timer period for talking to the web services). It would be tedious to have a UI for this and have to do it on every device post installation. Things I have tried and why they didn't meet my requirements:
*Raw Resource: If I unzip the apk and change the settings file, it becomes invalid as I need to resign the apk.
*Reading straight from the apk with ZipFile/ZipEntry: Device complains upon installation that the config file is not signed.
*PreferencesActivity: Requires device side UI; It would be tedious to have a UI for this and have to do it on every device post installation.
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Mar 4, 2009
Flipping between landscape and portrait is causing me a problem with dialogs that are active at the time of config change. The dialogs survive (which I think is good), but I have the problem that some of my dialogs contain dynamic content which would need to be refreshed in the dialog views. All that content disappears from the dialog views after the config change.
I thought it would be easier to do a dismissDialog() on restoration in onCreate(), letting the user press the button that shows the dialog. I successfully save and recover the dialog id, but when I attempt to dismissDialog(id) I get an IllegalArgumentException: no dialog with id 1 was ever shown via Activity$showDialog. Ok, so that doesn't work, and I still have that messed up dialog up on the screen that I want to get rid of. How can I do that? Are there any other reasonable alternatives?
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Aug 25, 2010
I was wondering if anyone who has tried Crazy Home knows of any application that allows you to switch icons from theme to theme like the Crazy Home launcher. I know of and have Bettercut, but that only allows you to create your own, or replace using a downloaded icon pack. But the crazy home app allows you to choose a theme, then use icons from another theme which bettercut does not allow. It also lets u change and icon to the theme icon. For example the gmail icon is default, but the email icon is themed, it offers the ability to change the gmail to themed.
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