Android :: Behavior Of SingleTask Not Consistent With Document
Mar 31, 2010
I have an app with two activities, one of which the launchmode is set to "singleTask". From the Android dev guide, I got the impression that my SingleTaskActivity should start a new task (or reuse an old task) and always sit at the root of the stack when launched.
However, it's inconsistent with the behavior of the app if I follow the steps below: - launch StandardActivity from home - click the "home" key - launch SingleTaskActivity from home, you will see it's in the foreground as expected - click the "Back" key, StandardActivity comes to the foreground whereas I expect to see the home screen because SingleTaskActivity is supposed to be at the ROOT of the stack. It appears SingleTaskActivity was launched into the task that StandardActivity started, rather than starting its own task.
Is my understanding about the "singleTask" launch mode correct?
=== The Android Dev guide (http://developer.android.com/guide/topics/ manifest/activity-element.html#lmode) says:
In contrast, "singleTask" and "singleInstance" activities can only begin a task. They are always at the root of the activity stack. Moreover, the device can hold only one instance of the activity at a time — only one such task.
CODE:.....................
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Sep 10, 2010
I've been learning Android and have come across an issue with launchMode="singleTask". The documentation states that when this attribute is used, the Activity is always launched into a new task as the root Activity. Secondly, the documentation states that if an Intent is targeted at such an Activity when there are Activities sitting above it in its task stack, such Intents are discarded (although the task is still brought to the foreground).I've been playing around with this, and the behaviour I observe is completely different. In particular:
- Activities with launchMode="singleTask" are not always the root Activity in a task stack. They are just plonked ontop of the existing stack with the same affinity.
- When an Intent is targeted at such an Activity and there are other Activities above it in the stack, the Intent is not discarded. Instead the Activities above it in the stack are discarded. The Intent is then delivered via onNewIntent to the Activity as normal.
Can someone confirm that this is the actual behaviour? If so, why are the documents incorrect? If not what have I done wrong.
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Nov 12, 2010
I have an application that runs in the background, and displays an error message via the notifications system. This notification has a pendingIntent that leads back the the app's main screen. On this main screen, I have set launchmode="singleTask". As I understand it from the Android Dev Guide, this should mean that my main activity will only ever have one instance.However, if the user is viewing that activity at the time (or another one within the app), and goes and touches the notification to clear it, it goes ahead and puts another copy of the activity on the stack, so if I hit the back button, it will return to the main screen again (from the main screen).
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Sep 16, 2009
In the documentation it is stated that an activity with launchMode="singleTask" is always at the root of the sctivity stack. However, when I run my "singleTask" activity for a few scenarios and monitors behaviour with "adb shell dumpsys activity" I can see it placed both at the top of the stack (with numActivities=2) and in the middle of the stack (with numActivities=3). The activity at the root (frontOfTask=True) has a "normal" launchMode.Is the documentation incorrect or am I missing something?
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Feb 18, 2010
I have an activity, ActivityA, and its launchMode is set to "singleTask".I start the application from the app tray. ActivityA launches ActivityB from a button click. ActivityB is a normal activity with no launchMode set ("standard").With ActivityB on top of the activity stack, I hit the home button, then resume the app, I see ActivityA instead of ActivityB when resumed.Shouldn't the history stack be preserved in this case, and B be showing? When I resume, I see A get onNewIntent() called, and I'm not sure why this is happening. I thought the stack would be preserved.
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Apr 22, 2010
So I have a MapActivity that runs an asynchtask that occasionally updates what exactly it's displaying on the map (via a string). I originally pass this string in from the intent when the activity is first created. And then if you click on one of the drawables on the map, it opens a new activity, which can then create a new mapview (same class) with a different string setting. The problem I have is that I only want one instance of the mapview to be running at once. Thus I set android:launchmode="singletask" in the manifest. This works in that it brings the mapactivity to the front, but is there any way to send it a new intent bundle to get a new setting for the string it needs? I tried regetting the extras from the bundle, but it seems to retain the old bundle, not the new intent that was passed to it. I'm not sure I want to do startActivityForResult because the 2nd activity may or may not want to update the original activity. I hope that made sense. I can post code if necessary, but I think that should explain my situation.
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Oct 13, 2009
Our application which consists of something like this: Main menu => View contacts => Edit contact => View groups => Settings => Browser settings
I have then added gestures so that the user can jump between any of these screens with a gesture. But this leads to a huge activity stack that just grows and grows so how should I properly implement this?
I thought about the following: Main menu (SingleTask) => View contacts (SingleTop) => Edit contact => View groups (SingleTop) => Settings (SingleTop) => Browser settings (SingleTop)
If I do nothing then I end up with something like this (using gestures): Main menu - View Contacts - Main Menu - Browser Settings - View Contacts - Main menu
I would guess this would lead to memory issues sooner or later?
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Jan 9, 2010
In a number of questions (like this one) I have been looking into how to "change screens" in my app. I have a "header" on top, with 4 buttons. Each button is meant to replace the "content" (ie change screen):
+--------------------+
| menu with buttons |
+--------------------+
| |
| |
| C O N T E N T |
| |
| |
+--------------------+
When I click a Menu button, I run the following code:
CODE:..............
As you can see, the startActivity is executed. Now, if I do not specify "launchMode" for the Activity that means that launchMode = normal. If launchMode == normal that means that the Activity will be re-created each and every time I navigate using the top header buttons, and that means that all data entered in "form elements" are gone (or at least hidden).
So, I found the launchMode "singleTask" that sounded sort of nice. If I add that launchMode to my Activity, it will not be re-created when I navigate with the buttons, thus keeping state. Great! Well, until I read this:
As noted above, there's never more than one instance of a "singleTask" or "singleInstance" activity, so that instance is expected to handle all new intents.
I found out that the sentence mean that there can be only one Activity that has the launchMode set to "singleTask" - if I have more than one it wont work (no compiler error though).
This means that I can only "keep the state" for one Activity, when switching back and forth (navigating) between my screens!
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Jun 23, 2009
I've come across a very annoying problem, which only seems to happen when I launch my app from eclipse for testing. If I launch it normally, it doesn't seem to have this problem.
This is how I can reproduce it: - Launch app via Eclipse - Press Home - Relaunch app via icon - Click menu->exit which tells the Service to clean up and calls finish () when the Service finishes cleaning up
For some reason, there seem to be two instances of the activity, one exits normally and the other one gains focus. Clicking exit does nothing since the Service has stopped but the Service variable is not null. Attempting to use the app launches errors since the resource it uses have been closed. I can force a close via the crash and relaunch the app, and it exits normally this time.
As I said, it only happens when launching the app via Eclipse. Anyone know what could cause this? My launchMode is set to singleTask, however, that shouldn't cause an issue, I used that mode before. I tried calling finish() regardless of the state of the Service, but it doesn't seem to help.
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Feb 17, 2010
I'm not sure why onPause() is not called in the following scenario.
Here's my activity:
CODE:.......................
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May 16, 2010
I have a weird situation with AlarmManager. I am scheduling an event with AlarmManager and passing in a string using intent.putExtra. The string is either silent or vibrate and when the receiver fires the phone should either turn of the ringer or set the phone to vibrate.
The log statement correctly outputs the expected value each time.
CODE:..........
The receiver that fires when the alarm executes also has a log statement and I can see the first time around that the statement outputs the expected string either SILENT or VIBRATE but for each subsequent execution the output shows the original value on the receiver end. The alarm executes and then I change the value for putExtra to opposite string and the receiver still displays the previous value event though the call from the code above shows that the new value was passed in. The value for setAction is the same each time.
CODE:.....................
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Dec 22, 2009
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"The application OpenWnn (process jp.co.omronsoft.openwnn) has stopped unexpectedly. Please try again."
So this OpenWnn process is not mine, it looks like it handles display of the virtual keyboard. When in this odd orientation mode, and you try to click in an EditText, I can see the virtual keyboard try to slide in from the left side of the screen, then that exception gets thrown.
I'm not sure what orientation this is, because it's not the normal landscape orientation you get by hitting ctrl + F11. In fact, the virtual keyboard shouldn't even be trying to display itself in landscape mode? Much less from the left side of the emulator?
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Feb 21, 2010
At about 5-10 seconds into a call (either outgoing or incoming), my transmissions are muffled for about 10 seconds. Thereafter, I have occasional intermittent similar problems. I can always hear the other party perfectly; they just can't hear me. It happens with either the built-in mic or the corded headset or bluetooth.
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Aug 3, 2010
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Nov 20, 2009
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Here are the results of my most recent tests.
SpeedTest.net
Download: 100 kbps
Upload: 855 kbps
XtremeLabs
Max Download: 100.2 kbps
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Aug 22, 2010
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Mar 8, 2010
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Oct 24, 2009
I have a package with two activities
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Sep 20, 2010
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