Android :: Using FLAG_ACTIVITY_CLEAR_TOP - But Don't Restart Target Activity?
Nov 21, 2009
I'd like to use FLAG_ACTIVITY_CLEAR_TOP to launch an activity in my app. It has one feature I don't want though - it restarts the target intent, instead of just resuming it. Example history stack, with activity D making the call to B with that flag:
A B C D
new stack
A B
But 'B' gets relaunched, its onCreate() method is called. Since B is already in the history stack, is there a way I can use this flag, but have it *not* recreate B, just onResume() it again? The reordering flags are kind of what I need too, but they won't pop C and D, just reshuffle the stack so B comes to the top, but I want C and D to go away.
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Aug 21, 2009
I have a problem to start/create Activity in landscape mode. My Activity need to start in landscape mode and be used in landscape mode by users. So far, I used setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) to force screen orientation of my Activity to landscape mode in onCreate() method.
In addition to this screen mode requirement, my application need to start another background thread in onResume() method, and this thread takes some seconds in order to finish an initialization process, and it is not desirable to to stop/restart this thread's service during the initialization process.
However setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) forces my Activity restart in a very little while (means onCreate->onResume->onPause->onStop are executed twice at the first place). As a result, my background thread be stopped/restarted during the initialization process, and this makes me a mess at this moment.
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Feb 11, 2010
I am starting an activity with startActivityForResult(intent,requestcode). And i am receiving result onActivityResult() call back .
The target acivity which gets the intent should get the request code And based upon the request it has to do the specified operation.
How can target activity get the request code, which is passed to startActivityForResult().
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Mar 25, 2010
I have created an activity which sends a number of notifications to status bar. Each notification contains an intent with a bundle.
Here is the code:
CODE:..............
When user clicks this notifications, I read the bundle string "action" and performs that action. Here is the code:
CODE:.................
Everything works as expected. But, when I minimize the app using "arrow" button on device and then press and hold home button and clicks on my app icon the application starts and performs the same last action which have been performed by clicking the last notification. I figured out that when we click the app icon the application starts with last intent triggered by the notification.
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Feb 23, 2010
I installed newst Android, JDK, Jer and eclipse. Than I tryed to build android project. But "build target" show "no target available". I looked at internet, they said I should run "Android SDK and AVD manager", I runed it but get follow message: Failed to fetch URL https://dl-ssl.google.com/android/repository/repository.xml, reason: No route to host: connect
I read this group's conversation that suggest to use http not https, I tried it but still can not run Available Packages.
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Aug 17, 2010
I'm building a game which works as some type of a quiz. I ask user the question and when he submits the answer(click or touch correct answer) I need to refresh the page with some other question.
How should i implement this? How to wait for users answer and continue when onClick or OnTouch listener finishes?
Should i use Handler class, intents or something else?
I want next scenario:
On the screen I have a question and 3-4 clickable ImageButtons. I'm building some of the layout dinamically from custom showQA() function. User choose the answer and if he clicked the correct answer i should start some type of animation on the screen. I've done that from the onClickListener. Now, i need to build layout again(show new question and answers) from the showQA() function which must be called after that animation showed to the user. How can i know when the onClickListener() finished its work?
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Oct 7, 2009
What are the differences between building for target 2 (no gmaps add on) and target 3 (with gmaps addon).
Could any one has the ant scripts to bulids for these targets.
I see 1.5 SDK does these though custom ant tasks rather than 1.1 ant scripts (this was more clear and apperant on how it does the build)
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Sep 9, 2009
Is there a way to restart an activity? The reason is that need to change the theme dynamically, and the activity needs to be restarted and redraw itself after the change.
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Jan 13, 2010
I've searched and I know it seems some people frown upon using activities within tabs, but moving past that...how would I restart a tabbed activity while still keeping the tabs visible? I have an activity in a tab, I use the menu to create a new activity to update the tab's activity displayed info, when I return from the menu activity I want the new information to be displayed in the tab's activity. I am using startActivityForResult() from the menu choice, but when I return and try to restart the activity...it wipes out the tabs above(I guess as expected, but I want to re-launch the refreshed activity within the tab).
Creating the tabs:
TabHost host = getTabHost();
Intent home_intent = new Intent(constants.HOME_ACTION,
null, this, homeTab.class);
Intent inbox_intent = new Intent(constants.INBOX_ACTION,
null, this, inboxTab.class);
Intent stats_intent = new Intent(constants.STATS_ACTION, null,
this, infoTab.class);
host.addTab(host.newTabSpec(constants.HOME_TAG)
.setIndicator(getText(R.string.home_label),
getResources().getDrawable(R.drawable.icon))
.setContent(home_intent));
host.addTab(host.newTabSpec(constants.INBOX_TAG)
.setIndicator(getText(R.string.inbox_label),
getResources().getDrawable(R.drawable.icon))
.setContent(inbox_intent));
host.addTab(host.newTabSpec(constants.STATS_TAG)
.setIndicator(getText(R.string.stats_label),
getResources().getDrawable(R.drawable.icon)).setContent(
stats_intent));
Return from the menu activity in the tab's activity(updating database info): code...
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Mar 8, 2010
Activity SplashScreen is the launching activity for my app. It sends a request to my server and gets back a user data it then uses to populate a user object which is a static object. Once it has that it calls the MyMapView activity and finishes itself. A force close occurs when I hit the home button and then open up enough other apps so that Android kills MyMapView to get more resources. Now when I open my app again it tries to start MyMapView and bypasses SplashScreen. There is no user object so I get null pointer exceptions. I have tried to Override the onSaveInstanceState and OnRestoreInstanceState but it seems that those are not available when Android kills the activity. I also tried android:finishOnTaskLaunch with the SplashScreen (maybe this should be put on MyMapView but the article I read said different) and that seems to have no effect. What I would like is for the activity to not restart after Android has killed it. What can I do about this?
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Mar 18, 2010
For an unknown reason, I can't get my application leaving properly so that when I push the home button and the app icon again I resume where I was in the app....But I would like to force the application to restart at the first activity...I suppose this has something to do with onDestroy() or maybe onPause() but I don't know what to do..
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Nov 5, 2010
I'm developing an application that uses a library project to store much of the functionality and content. When I edit the code and/or content in the library and then run the app, it doesn't properly restart the activity with the changes, giving the warning:
Warning: Activity not started, its current task has been brought to the front
I understand that this warning comes from the SK not thinking that there were any changes to the app, but there were (to the library, not to the app itself).
The only way that I've found to force the app to recompile with the library changes is to do Project->Clean. While this is effective, it's a bit annoying to have to do this every time a make a change. Does anyone know of a way to force the SDK to recognize that a library change should result in reloading the application?
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Mar 19, 2010
I want to make an activity that allows orientation changes on some condition, but not otherwise. More exactly I want to prevent restarting the activity when a background thread is busy.
I have put the configChanges attribute on the activity manifest, and onConfigurationChanged is called when the orientation changes. However I want to allow the app to change the orientation when allowed.
CODE:...................
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Jan 13, 2010
My application has two activities, that I start in this order: HOME > A > B Now I press HOME and launch "A" again. I would like to see activity "B" on a top of "A", but instead I get "A" - so the activity stack is cleared. Manifest: <activity android:name=".activity.A" android:label="A" android:always Retain Task State = "true">What should I do?
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Sep 22, 2010
How to bring stop activity to foreground (restart) by itself?i use Broadreceiver and intent to restart my activity.but always start two activity (include original activity)how to restart my original activity?
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Mar 17, 2010
I have a single Activity application, within it I have a service which creates an AlarmManager and sends a broadcast to a broadcast Receiver.If the activity which starts the services dies, (ie. divide by zero), the broadcast receiver stops the old service which created the AlarmManager.It works the first time. The second time, it does not.It seems like the AlarmManager is still active but the broadcast receiver is no longer receiving. It works great once!
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Oct 6, 2010
In my Project I want to play audio files in mediaplayer and displays progressbar. If I exit the application then also player have to play audio file. If I restart The Activity
I have to display progress bar with last activity progress.
Here I tried using onSaveInstanceState() method. But I cant display progress bar with last progress. when I exit the activity player is playing but when I restart activity it stopped and displayed new view without any progress and saved data.
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Jul 28, 2009
I have fixed the activity screen orientation to portrait on AndroidManifest.xml file. When I open or close the keyboard the activity gets restarted. How to avoid this restart?
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Dec 14, 2009
I am using Android 2.0 and have the following situation:
CODE:..........
This activity belongs to a task that has a service running and is usually not killed, so even when I am in the home screen I see the task running on DDMS (I will call it Task A).
It is possible to start Activity A from another application (running on Task B). When it is launched, I assume Activity A is "reparented" to the Task A. I assume that, because the debugger stops on the breakpoint I have set on onCreate and I am debugging Task A only. Please, advise if this is not correct.
So at this point, as far as I can tell, Task A has only Activity A. When in this situation, the service running on Task A receives some event and puts a notification on the Notification bar. This notification, if clicked, will send an Intent that also starts Activity A (this Intent has flags FLAG_ACTIVITY_NEW_TASK and FLAG_ACTIVITY_CLEAR_TOP).
Now to the problem, what I expected is that, because of the CLEAR_TOP flag, Activity A would be destroyed and recreated, as it has standard launch mode. But what I observe is that another Activity A launches on top of the previous one. When I click BACK on the new instance of Activity A, the old instance is redisplayed, what for my use case is wrong. Note that this only happens when launching Activity A from another application. If I launch it from my application and click on the event on the notification bar, it is destroyed and relaunched.
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Aug 17, 2010
In my android app, I'm making a method that pop all activities and bring up the first activity.
Intent intent = new Intent(this, MMConnection.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
this.startActivity(intent);
As I noticed that the transition was still a left to right animation, does someone know if there is a way to change system animation when starting an activity? Actually, I'd ideally like to have a right to left transition (like when the return button is tapped)
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Nov 8, 2010
I have an Android app with a splash screen.
This splash screen pre-loads data and when finished starts the application's main activity and finishes (through a finish() call).
This works quite well as long as the application is not totally killed. So, I can usually switch back and forth between different tasks as usual: when I leave the app from a sub activity and return soon after I will be presented with this sub activity.
Now, when I leave this sub activity and do some other stuff for a while inevitably this application process is killed by the OS.
No problem so far. Now I would expect Android, being unaware of my preloading (if the data was not preloaded it would just take longer or not display some fonts, but Android cannot be aware of the fact that I am doing preloading somewhere), to restore the sub activity from a Bundle. However the splash screen activity is started.
So, I say, that's fine then... the splash screen activity is after all the launcher / main activity. Now, the actual mystery I have is as follows.
When I press the back-button from this newly loaded splash screen I will be presented with the sub activity I left the application from before it got killed. I really don't understand this. Apparently Android DID save the sub activity's state (and its history stack) to be reloaded but instead of reloading it chose to start the splash screen instead, with this sub activity (I left the task earlier before it got killed) one step back on the activity stack.
Why does this happen?
When the process is not killed I can switch back to where I left off. When it's killed I cannot (yet still have the whole earlier history of that app restored). I know that Android has to load state etc. in the latter case, but that shouldn't be a problem and is performed automatically by default (according to the docs).
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May 15, 2009
I am developing a ToDo reminder type of app for android. on creation of a new reminder an alarm and vibrator scheduler is created with a toast. This works on intents and broadcasts and is pretty straight forward stuff with putextras using the reminder id from the db. My problem is, if some one restart the phone, i guess all the scheduled alarm and vibrator tasks for the reminder will be killed. Once the phone restart again how to recreate the scheduler tasks.
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May 8, 2010
My app intiates an activity. On the click of a button, the app opens up the browser with a webpage. When I hit the back button, it comes back to my initial activity screen, but does not resume or restart the activity.
When I put all the layout code and activity code in onResume instead of onCreate, the activity gets restarted.
My question is whether this is the right way to go about it? Can I use onResume to draw my layout and initiate the activity, or is this poor design? When the browser fires up, does the initial activity forget its layout?
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Apr 20, 2010
I have noticed that when aps restart my phone, it takes about 15 to 20 seconds to restart When i Power down, it takes MINUTES!Does anyone know of simple restart app I could use to avoid this? If not, anyone know someone who could make one?
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Oct 30, 2009
Trying to set up my eclipse envirnment to actually be able to try some things out on android...
I've installed the sdk, put it in my path variable, installed the ADT, downloaded the "developer tools" from the eclpise menu..
But... Then I go to the command line, navigate to the tools folder of my sdk, and run "android create avd --target 2 --name mine"
and I get this "error":
Error: Target id is not valid. Use 'android.bat list targets' to get the target ids.
So, I of course happily run the 'android.bat list targets' and get the following message!
"Available Android Targets:"
That's it. There are no targets.... I open the AVD window in eclipse, there are no targets... I click "New" in that window, and a target is required, but the drop down is disabled because there are NO AVD TARGETS.
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Jan 21, 2010
I'm really new at this. I'm following the book "Android" by O'Reilly press a little outdated, I'm using Pulsar for Mobile Java Developers. Build id: 20090920-1017 I go to File, New Project, Android, Android Project. I enter "Hello World" for Project Name. Then I get "An SDK Target must be specified." There is a check box but it says "no target specified". How do I get this resolved and how do I get to the command line?
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Feb 21, 2010
I downloaded Android most new version and downloaded most new eclipse, I plugin Android into eclipse. But when I make new Android project
"build target" tab, show "no target available" who can tell me how can I get a target?
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Jan 20, 2010
I'm trying to create an AVD, but I don't have any target ID's available. If I enter "android list targets" at the command prompt in the tools directory, I get an empty list.
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Apr 14, 2009
Is it safe to use the 1.5 early look SDK to build production apps for 1.1 targets? I want to start developing a cupcake branch of my software, just wondering if I'll need to switch back to using the stable SDK for production builds...
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May 3, 2010
While trying to create a new Android Project., Get a error - An SDK Target must be specified. The documentation states that - "Under Target, select an Android target to be used as the project's Build Target. The Build Target specifies which Android platform you'd like your application built against." However in my case The Build Target section of the open dialog does not contain any text field or select dropdown, so I am not able to specify anything.
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