Android :: Application Lifecycle And OnCreate Method In Sdk
Apr 19, 2010
I slapped together a simple test application that has a button, and makes a noise when the user clicks on it.
Here are it's method:
CODE:..................
My question is, why is onCreate acting like it's in a while loop? I can click on the button whenever, and it makes the sound. I might think it was just a property of listeners, but the Button object wasn't a member variable. I thought that Android would just go through onCreate onse, and proceed onto the next lifecycle method. Also, I know that my current way of seeing if the sound is playing is crap...I'll get to that later.
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May 12, 2010
Maybe my question might seem a bit weird, but I have an activity in which, in one case , I have to move to another activity before it finishes loading the screen. My condition is in the onCreate method, which means when I encounter it, i get a "startActivity called from outside an activity context" error and the app just crashes. But then, is there an easy way like a flag for the intent to make it work without having the activity context resolved?
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Apr 1, 2010
I have a EditText on simple activity with a button.
when every i move from one activity to this acivity focus is automatically set to EditText and keyboard appears in phone.
i don't want to open keyboard until i click on editText.
can any one guide me what should i do?
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Apr 14, 2009
I call an activity from another with startActivity(new Intent(Caller.this, NewActivity.class));
I had a problem with a variable. So, using debug I saw that I pass two times in the onCreate method of NewActivity!
I was a little bit surprised. Somebody can explain why and how can I avoid this behaviour?
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Mar 3, 2010
I am encountering an exception in the onCreate method of an activity.
CODE:.......
The onCreate method is as below.
CODE:......
The layout view XML is as below.
CODE:..........
I've already changed the ID of the ExpandableListView to "list". But it is not effective.
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Aug 27, 2010
I have some code in the onCreate method an Activity and noticed that it is being called three times. Is it normal behaviour?
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May 2, 2009
I use sdk 1.5 version and same to my handphone, my handphone is use G1. Now i test my application on my handphone. When i push on keyboard, i found system will destroy current activity(execute onDestroy() method) and execute onCreate() method again. So i will all current status and all datas. I don't wish this happen, how to block system execute onDestroy() and onCreate() when i open and close keyboard?
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Oct 1, 2010
In my android app I call the voice recognition in my onCreate method of my startup activity. I have made it a preference to start up with the voice control or not. However, the app takes about 5-7 seconds to load when voice recognition is on. When it is off, the app starts almost instantly. Below is sample code, I have added Free_Form, max_results 1, and a custom prompt to mine.Why would calling the normal android speech recognition take sooo long to load in my OnCreate method?
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Jul 8, 2010
I am trying to create a Servicefor my application which will negotiate Bluetooth connections and data. I want this service's lifecycle to start and end with the Application, but still be able to have specific Activities listen for events that occur within this service (in addition an Activty should be able to call specific methods of the Service to write data or query connection state).
I started by creating AIDL interfaces for my callbacks and service, but I can't figure out exactly what I'm doing.
How is the best way to go about this? EDIT: To be clear, I do not specifically need (or want) more than one process for my application. Right now I don't have more than one; I'm just using AIDL because it is the only way I know of for a Service to communicate with an Activity.
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Nov 17, 2010
I'm fairly new in Android/Java programming, so some of the basic stuff is still quite confusing. So, lets say my application gets all data (articles) it requires from external XML files, it parses them to data models (Article class) and those articles will be used (displaying in lists or single article) all over the application for all it's lifecycle.
Where should I keep them? Can I create singleton class with an array containing all the articles I've parsed? Or should I save them to database and then query it on demand? (that sounds like too much work, I don't need to cache them for now) What's the best practice here?
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Jun 20, 2010
old question: "Why does creating a Toast crash my application?" My application runs fine if I don't use toasts but if I want to create and show a simple Toast I get these lines in the log and then the app crashes.
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Jun 15, 2010
I have two applications installed on my emulator, 1st application has 3 methods in it , If I want to call one of the methods from the second application , what should I do? I have tried to launch the activity its working fine. But now I don't want to launch the application rather use some functionality of the application with out launching it.
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Aug 7, 2010
Is there a way for an InputMethod or InputMethodService to identify the application for which it is providing input?
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May 7, 2010
I'm working on an Android application that has several Activities. In it I have a class with several static methods. I would like to be able to call these methods from the different Activities. I'm using the static methods to load data from an xml file via a XmlResourceParser. To create a XmlResourceParser requires a call on the Application Context. So my question is, what is the best way to get a reference to the Application Context into the static methods? Have each Activity get it and pass it in? Store it somehow in a global variable?
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Oct 29, 2010
Can anybody tell me what method of an activity executes when an application closes?. Like I have a main activity and if I press back button on my phone. The Application closes so I want to know what method executes at that time.
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Mar 31, 2009
Who can give me a input method application which can replace QWERTY keypad and do not need a HVGA screen (that can also fit VGA / WQVGA / QVGA)?
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Aug 27, 2010
1. I am in the process of creating an Input Method for Android devices. I using Eclipse(3.4) IDE and have Android (1.5 and 2.2) SDK. 2. Currently i am doing testing on the Emulator. But i wish to test it on actual Android device. 3. Can you please tell me which ideal device should i buy to test my application 4. Is there any lead device assigned by Android for a given SDK. 5. I intend to sign and publish my application so can you please tell me is there any Certification criteria which i have to follow.
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Mar 2, 2010
Looking to see if there's an existing method or application to increase display size for all applications for people with bad vision.
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Jun 15, 2010
I've seen topics discussing this but no one has seemed to post a solution. At the moment, I'm testing passing parameters to my .Net web service. When the parameters reach the web service it adds it with an additional string then returns it too my application; but all I'm returning is the string message, not the parameter I passed. Is there something wrong with my web service or my soap method?
Soap:
CODE:..........
Here is my simple .Net web service:
CODE:..............
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Apr 5, 2010
In my application I have several activities, the main screen has 4 buttons that each start a different activity. So one of them is a search activity, once it searches it shows you a result activity. This result activity can be reached from other activities, so in general something like this:
Main activity -> Search activity -> Result activity
Main acitivty -> someother activity -> Result activity
Now, if I have reached this result activity and press back once or twice, and after that press the Home key it will show the Home screen. But if I want to get back to my application by holding the Home button and clicking on my app it will always go back to the Result activity, no matter which activity was the last one I was using. And if I press again back it will take me back to the Home screen.
If I try it again it will take me again to the Result activity. The only way to avoid this is to start the application by clicking on the app's icon. And this takes me to the last activity I was using and it remembers the state so if I press back again it doesn't take me to the Home screen, instead to the activity before it. To illustrate this:
Main activity -> Search activity -> result activity --back--> Search activity --Home Button--> Home Screen --Hold Home and select the app --> Result activity --back--> Home Screen
--Click application icon--> Search activity --back--> Main activity
Another thing that happens is that if I press the Home button while on the Result activity, and start the app by clicking the icon, it will take me to the activity prior the the Result one.
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Sep 10, 2010
There's a decent amount of information out there on the Activity lifecycle. But I'm surprised how difficult it is to find a comprehensive description of the rendering lifecycle. By that I mean the order and rules by which a tree of nested activities, views, and drawables get to be sized and drawn to the screen, and the points at which a developer can modify rendering behavior.
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Oct 5, 2010
In the Android Application Fundamentals it says that after the call to the onStart()-method of the activity lifecycle either the callback method Resume() or onStop() is called. In case of an "normal" Start of an activity the system calls onCreate(), onStart(), onResume().But does somebody know an example where onStart() - onStop() are executed one after another?
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Feb 7, 2010
I am having difficulties with the lifecycle of the opengl context. While rendering my scene and the user hits the back button, home button or another application opens in front of my application, my app is still running in the background.
So when my application comes to the foreground later on (user relaunches it or the app that was opened on top of it finishes), my application crashes and leaves me nothing but a GL stack trace which i can't properly decipher.
For rendering i use the GLSurfaceView and therefore delegate the onPause and onResume. The crash happens on the first call to glDrawElements(..).
I have tried to reload my resource (geometry/textures etc.) on onSurfaceChanged but with or without reloading... The problem persists.
This behavior can be observed on all AVD versions of the emulator as well as on the G1.
Here is the gl stacktrace i get.
CODE:.............
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Jul 14, 2009
I just ran into a situation where it looks like a static variable reference is persisted across activity sessions. I didn't expect that because I thought that when an activity exits, it's de-referenced and garbage collected. I am wondering if anyone can shed some (more) light on when the VM eliminates object references for Activities and Services and in particular when static variables get reset to default values?
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Apr 20, 2010
I have creating application with 3 activities, where A - list of categories, B - list of items, C - single item. Data displayed in B and C is parsed from online XML. But, if I go trough A -> B1 -> C, then back to A and then back to B1 I would like to have it's data cached somewhere so I wouldn't have to request XML again.I'm new to Android and Java programming, I've googled a lot and still can't find (or simply do not have an idea where to look) a way to do what I want.Would storing all received data in main activity A (HashMaps? ContentProviders?) and then passing to B and C (if they get same request that was before) be a good idea?
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Aug 7, 2009
http://developer.android.com/reference/android/app/Activity.html
The Activity Lifecycle could have implementation and or design bug: One case is to initialize a big image in onCreate(), try to reuse the image during the whole lifecycle, and then recycle the image in onDestroy(). Test showed that onCreate() is called every time one navigate away from the activity and back again, but onDestroy() is not called at all. This behavour causes memory leaking for the big image (size 960*1920). After 6+ times away and back to activity, the system runs out of memory and has to kill the process.
One workaround is to initialize the big image in onResume() and recycle in onPause(), but that's not so good reuse.
Could it be better to change the process (as shown in the diagram) a little bit such as: Call onDestroy() first when a process is killed?
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Sep 7, 2010
I'm trying to override the onBackPressed() method of the ActivityGroup class:
public class MyClass extends ActivityGroup {
@Override
public void onBackPressed() {
// do something
return;
}
but I'm getting the error The method onBackPressed() of type MyClass must override a superclass method. I'm relatively new to Java, I've seen here that people do it and it works for them Why I'm getting this error? I'm writing an app for android 1.5, could the problem be here?
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Nov 22, 2010
In Eclipse, when I mouse hover over a built-in method, it displays a method definition including stuff like what the method does, input objects, return objects etc. If I have a yellow line (warning) under the method I'm trying to use, I can't get the mouse-over to show the definition. If I try hitting F3, I get a "The Jar of this class file belongs to container "Android 1.6" How do I show the definition of the method I am using when there is a warning?
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Mar 4, 2010
I have a problem with the activity lifecycle specifically on Nexus One (2.1 running on emulator works fine). If I just create a simple empty Activity with no special launchModes that logs the calls on the onStart and onStop methods, this is what I see: - launch app: onStart called; - home button: onStop NOT called; - launch app: onStart NOT called; - home button: onStop NOT called: and so on. Sometimes if I press the back button then the onStop is not called, but the when i launch the activity again the onStart is called and right after the onStop is called. Similar results with different launchModes. What is going on? Can anyone confirm this?
i found an android issue for the problem here: http://code.google.com/p/android/issues/detail?id=6094 and a similar thread here http://groups.google.com/group/android-developers/browse_thread/threa.
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Jul 12, 2010
I have a custom view on which I need to call a method from my activity after the view has been measured in onMeasure. I would like to know exactly when onMeasure is called in the View layout process. It looks like onMeasure is called after my activity´s onCreate, onStart, and onResume. I could override onMeasure and maintain a variable that contains whether the view has been measured or not. However it would be nice to know if there is a rule that relates onMeasure to the activity lifecycle?
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