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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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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May 17, 2010
I have MainActivity which is an Activity and other class(which is a simple java class), we`ll call it "SimpleClass".
now i want to run from that class the command startActivityForResult.
now i though that i could pass that class(SimpleClass), only MainActivity's context, problem is that, u Cant run context.startActivityForResult(...);
so the only way making SimpleClass to use 'startActivityForResult; is to pass the reference of MainActivity as an Activity variable to the SimpleClass
something like that:
inside the MainActivity class i create the instance of SimpleClass this way:
SimpleClass simpleClass=new SimpleClass(MainActivity.this);
now this is how SimpleClass looks like: code...
now its working, but isnt a proper way of doing this? I`am afraid i could have some memory leaks in the future.
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Nov 23, 2009
I have two buttons in an activity/view A0, b1 and b2 that respectively starts (for result) the activities A1 and A2. After tapping/clicking b1 I quickly tap b2 aswell. The result will be that both A1 and A2 are launched. Is there any obvious way to not have this behaviour, i.e. to "lock" A0? I am thinking of overriding dispatchTouchEvent to consume everything after the call to startActivityForResult, but it seems a bit much...
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Nov 12, 2010
I got a question about Activity.finish(). In my Android code, there are 4 activities(A,B,C,D). The starting activity A calls startActivityForResult(intent, reqCode) to start activity B. B starts C, and then finish(), not waiting for result. C does exactly the same as B, starts D and then finish(). D will return some result, by setResult(resultCode).
When my code runs and activity D returns some result, A will catch a RESULT_CANCELED on onActivityResult(), even if RESULT_OK is returned in D. I guess the RESULT_CANCELED is from activity B, which has been terminated before D returns a result, rather than from D.
But, my question is, why activity A catch RESULT_CANCELED after D returns some result, rather than immediately after B is terminated? And, what should I do to make A catch results from D? Do I have to keep B and C alive, to pass results from D to A?
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Mar 23, 2010
I have 3 classes in my example:
Class A, the main activity. Class A calls a startActivityForResult:
Intent intent = new Intent(this, ClassB.class);
startActivityForResult(intent, "STRING");
Class B, this class is a TabActivity:
Intent intent = new Intent(this, ClassC.class);
tabHost.addTab...
Class C, this class is a regular Activity:
Intent intent = this.getIntent();
intent.putExtra("SOMETHING", "EXTRAS");
this.setResult(RESULT_OK, intent);
finish();
onActivityResult is called in Class A, but the resultCode is RESULT_CANCELED instead of RESULT_OK and the returned intent is null. How do I return something from the Activity inside a TabHost?
I realize that the problem is that my Class C is actually running inside of Class B, and Class B is what is returning the RESULT_CANCELED back to Class A. I just don't know a work around yet.
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Jul 25, 2010
I have a main screen with buttons to launch other subactivities. I have to press back button each time to go back to the main screen of my application. How do I finish a child activity and automatically return from the caller?
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Apr 7, 2010
Can someone tell if why when starting an activity with startActivity(intent) , calling getParent() in onCreate() of the new created activity returns a nul ?
Also how could I obtain the parent of an activity created in such a way ? Can a reference of the activity below the current activity in the activity stack be obtained ?
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Sep 25, 2009
The application I'm currently working on consists of several dialogs and there is an issue with one dialog I still haven't found the cause.
Running the debugger the execution reaches the following two lines:
CODE:.................
And then the onCreate() method in DlgLogin class executes as well
But the login dialog doesn't appear. If I leave the device idle for such long period of time that the screen turns off and then press any button on the device to turn it on the login dialog appears.
The dialog of course should appear immediately but so far haven't found the cause of the problem.
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Dec 14, 2009
I'm using ExpandableListView in my app and one of the complains is that when expanded it's hard to visually distinguish where the child item ends and next group item begins. So I would like to change background of the child list item to the different shade. Brutal attempts that I've made so far were based on directly changing background color and text of the elements inside the child view item but that leads to loss of hovers and highlights. So my question is - what is a good strategy to achieve the above? I tried styles and selectors but what really bums me out - that if I change one thing then I need to add selectors for all combinations of focus/enabled etc. when all I'm trying to do it to overwrite a single thing. Is there a way to inherit parent style and set just a background for non- focused, enabled child item?
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Sep 7, 2010
As we know, startActivityForResult() used to get a result for a task from parent activity. Here when we click the setResult(). It returns the result to the parent Activity.
Child Activity means it should maintain the persistent state. That is when the users clicks a button on the child activity. It do not finishes that activity and show the Parent Activity. And again i may go to the child activity from parent activity. If the child does not exists it starts a new child activity else it should show the existing child activity with persistent content.
Simply said, my parent Activity starts a new Child Activity. Now both Activities should be alive. How to call the Parent Activity without finishing the child Activity(in other words, How to BringtoFront the parent Activity)? For this scenario,
you can not use startActivity(). Because it creates a new Activity Instance. Not Existing Parent Activity
you can not use startActivityForResult(). Because it finishes the child Activity Instance.
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Mar 30, 2010
My child activity X is called from Parent activity P through startActivity(intent). I want to close P when X called its finish() method. I override a method finishFromChild(Activity child) in P and called finish() in it. But this functions (finishFromChild(Activity child)) is not being called after X finish() Is it a known bug or I am missing some thing? I googled and also searched the groups but no help.
An alternative could be... using StartActivityForResult() and a "fake" onActivityResult, where I can finish the parent activity, but this way is quite bad, i think...
I prefer the first one, if it would work....
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Dec 14, 2009
Any idea why this doesn't create an activity that looks like a popup instead of an activity that completely fills the screen?
CODE:.............
I assumed that I only needed to set the layout height and layout width to something other than "fill_parent", but it still shows up as a black screen that completely fills the screen.
Ultimately, I simply want to create a popup, but I do not want to use an AlertDialog. Is this possible?
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Jul 2, 2010
I have a parent activity, and a child activity that extends the parent activity. When the parent starts the child activity,
Which onCreate gets executed first? The child's or parent's?
There is a particular variable I am setting in the Child activity's onCreate method, and right now, it looks like it takes a while to get to the Child activity's onCreate, and so the methods in the Parent are reporting an empty variable. Whereas when I make the Parent sleep for a while, it reports the correct variable.
CODE:............
So, basically, even after the Parent starts the Child, it still returns "Parent Value", but when I have the thread sleep, it return "Child Value".
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Jun 28, 2010
When we want to pass data from an activity to a sub activity we use the is there any event handler that handles this?
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Nov 8, 2010
I want to open new child activity in the parent LinearLayout. Just similar like Tabs.
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Jun 14, 2010
My application supports twitter and needs to open browser for OAuth. When the user clicks the Share on Twitter button, the main activity will create another subactivity (TwitterActivity) to handle twitter authentication issues. Here is a flow graph showing how activities are invoked currently. Main is short for MainActivity and Twit for Twitter Activity. startActivity() OAuth intent OAuth callback finish()Main ---------------> Twit ------------> Browser --------------> Twit --------> Browser As you may notice, after the TwitterActivity calls finish() to stop, it will now return back to MainActivity, but Browser instead. How can I make it return back to MainActivity?
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Jan 28, 2010
I wish to re-use the Contacts application in a way to enable the user to pick a contact and return it to the parent activity (my application's activity).
For achieving this, I want to inquire about the kind of Intent that will be needed to launch the contacts application.
Intent i = new Intent(Intent.ACTION_GET_CONTENT, ?); startActivityForResult(.....);
What should be the second argument here ?
In the deprecated Contacts API, I could use the following snippet, but not sure about ContactsContract:
Intent i= new Intent(Intent.ACTION_GET_CONTENT,People.CONTENT_URI); startActivityForResult(i, reqCode);
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Jun 30, 2010
I want to do some cleanup in a view when the activity is being destroyed. Is there any way to get a callback in the View when the activity is being destroyed? I tried using onDetachedFromWindow, but I'm not sure whether it is correct thing to do.
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Jun 20, 2010
In one of my Activities I have a ListView that displays a list of locations. For each list item I want a little arrow icon that points in the direction of the corresponding location. I implemented this icon by extending ImageView. This custom View has a listener that reacts to changes of the device's orientation by rotating the icon image accordingly. I register the listener in the onAttachedToWindow() method and unregister it in onDetachedFromWindow(). This kind of works but the problem is that onDetachedFromWindow() sometimes gets called only a long time after the containing Activity has paused. Also, the whole layout overall seems a little hacky. So my question is: Is there a proper way to unregister the listeners or would you implement this in a completely different way to begin with?
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May 8, 2009
I basically have three activities X, Y, Z and I want only one instance of each but I want control over the navigation and I can't do that by putting all three activities in one task because of the stack structure.
Here is a scenario, from X I launch Y given a certain "id" which correspondence to specific data in the DB, Y inflates and populates it's views, then I go back to X and launch Y again with a different "id" in the intent, I don't want the overhead of launching the activity and inflating the views again, anyone know how to do this?
I tried using singleInstance, but the problem is that I can't send the result code back to an activity in a different task.
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Aug 5, 2010
The order is:
A: startActivityForResult( B ) B: <dostuff>, call finish() A: onCreate <---- what's this all about A: onActivityResult
This happens for a tiny minority of users. I havn't been able to reproduce or find any common elements. A is the launch activity.
CODE:..............
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Oct 7, 2010
I wish to have a single class which all of my Activity classes extend. I have ListActivities, Activities, MapActivities, TabActivities, etc in my App.
I have many of these different activities in my app, ~12 activities. I want each of them to have the methods which are in the parent class.
Right now, i have created 4 parent activity classes which are extended from a certain activity depending on their type(ListActivity, Activity, MapActivity, TabActivity)
I am creating a lot of redundant code - each of the 4 parent activities has almost identical code, in exception for what class activity it extends.
Here is an example that may clarify what my problem is:
I have an Activity: MenuScreen which extends BaseListActivity BaseListActivity extends ListActivity BaseListActivity contains methods and fields which i want all my activities to have access to I have another Activity: HomeScreen which extends BaseActivity BaseActivity extends Activity BaseActivity contains the same methods and fields which are in my other Base[<type>]Activity classes(such as BaseListActivity)
These methods/fields are copy-pasted to all my Base[<type>]Activity, and seems awfully redundant to me.
Can i create a master activity class which all types of Activity classes can use as its parent? if not, am i stuck with copy and pasting this code and feeling gross/dirty about it?
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Jun 1, 2010
I have two activities: a MainListActivity, and a DetailViewActivity. DetailViewActivity is set with android:launchMode="singleTop".
When clicking an item in the "main list" activity, it launches the "detail view" activity via:
startActivityForResult(detailIntent, REQUEST_CODE_DETAIL);
If I then call setResult(RESULT_OK, resultData); and finish(); from within the Detail activity, that resultData is received by the "main list" activity's onActivityResult(..) method correctly.
However, if I implement a "see previous"/"see next" type of navigation within the Detail activity, and implement it using singleTop, that result no longer gets sent back to the initial activity:
Intent nextItemIntent = this.createIntent(nextId);
nextItemIntent.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(nextItemIntent);
// at this point, my DetailActivity's onNewIntent() method is called, and the new data is loaded properly
But from here, when I call setResult(..) and finish(), my MainList activity never receives the new/updated result. Anyone know what I'm doing wrong?
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Jun 8, 2010
I have an application, which (for the sake of simplicity) has two types of activities - Overview and DetailView. The Overview activity shows a list of steps and allows the user to start a DetailView activity corresponding to the step chosen.
In the DetailView activity, the user can start another Overview, which shows different steps than the ones in the parent of the current DetailView.
In the Overview, DetailView is started by using startActivityForResult (). In the DetailView, when the user decides to start a second Overview, I call setResult () and finish () and then start the new Overview. In this scenario, onActivityResult () and finishFromChild () do not fire. Instead, they fire when the parent finishes (?).
Code from Overview:
CODE:....
Code from DetailView:
CODE:..........................
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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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Aug 19, 2010
Currently my application allows the user to set the application to run in full screen. I than check in every activity at onCreate() if the user has set to make the app run in full screen. Is there a better way to do this? I have many other settings that I do and I find this method a little bad in terms of code design. Is there a way to set full screen for the lifetime of app or until I set it back to not full screen? One way to do it would be to have a custom Activity class that does these checks and all my activities can just implement it? would that be slow is it recommended?
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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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Sep 23, 2009
I have a problem with the startActivityForResult function?
My code:
CODE:..........
But the second intent is only starting and if i finish the second intent (getPicture), the first intent is called. Why?
The logcat shows:
CODE:.......
So why the savefilename-activity doesn't start first?
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Jul 19, 2010
What is the lifetime of an app's global android.content.Context object? Does it last until the last component of the app is terminated by the Android runtime?
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