Android :: Activity Execute OnDestroy() / OnCreate() Method When Push On Keyboard
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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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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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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Jun 13, 2010
I've been searching a way to implement an intent so when a user clicks on a notification, an specific method from an activity is executed (or an specific behavior happens). Right now I'm thinking about using broadcast but I don't know if this is the best way to implement this functionality. How would you implement it?
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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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Jun 30, 2010
when writing a ContentProvider I have to implement the onCreate()-method, in which I establish my database connection. But to write the changes I made to the database I have to close the database on some point. Does something like a onDestroy()-method exist for ContentProviders or is there some intent I have to listen to, which is fired before killing my process?
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Jan 4, 2010
With following simple code (on clean, new android project):
CODE:..............................
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Sep 11, 2009
Why does app not get onDestroy when exited but then receives an onCreate when relaunched?
Here is the trace. Launched app
It received onCreate and the other expected on calls for a launch. Now, leave application with the home button and it receives onSaveInstanceState onPause onStop
And returns to the main Android screen (the one with Google Search at the top) Launch the app again and it receives onCreate onStart onResume
The docs say onCreate is Called when the activity is first created. But here it is never destroyed but created again. There are many objects that never got GCed because the app was not onDestroyed?
Is this a memory leak? What have I missed? Or should I assume that onCreate can be recalled for an already created app.
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Sep 25, 2010
is there a way to tell Android that I would like subsequent calls to startActivity() all resume the target activity rather than creating it over and over again? Any workarounds?
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Feb 3, 2010
If I override my main Activity's onDestroy() method in order to recycle a bitmap when the screen is rotated, should I call super.onDestroy() before or after myBitmap.recycle()? Does it matter?
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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 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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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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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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Jul 8, 2009
I have put HTML document into a string variable and load it by using webView.loadDataWithBaseURL(null, htmlString, "text/html", "utf-8", null).
After that, I tried two ways and want to execute javascript function "exec()" by using
1. webView.loadDataWithBaseURL(null, "javascript:exec()", "text/ html", "utf-8", null) -> This will overlap the content of previous "htmlString" and shows "javascript:exec()" on the screen.
2. webView.loadUrl("javascript:exec()") -> There will be "Can't find variable: exec line: ..." in Logcat
I have tried to output "htmlString" to a file located in sdcard, and tried to use webView.loadUrl("file:///sdcard/xxx/a.xhtml") + webView.loadUrl("javascript:exec()").
And...it fails again! how to execute javascript function after loading html content by "loadDataWithBaseURL"?
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Oct 28, 2009
When user presses BACK key, my activity's onDestroy is called and then it is killed. Is there a way (by overridding Activity.onKeyDown??) to simply put the activity into background without killing it? I want the BACK key to act like the HOME key (which doesn't kill my app), except I want to show the activity immediately below my activity.
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Apr 5, 2010
I am working on a MVC implementation for Android (to be subsequently hosted on SF and/or GC).
It works like this:
Activity (View) <=> Application (Controller) <=> Data (Model) <=> Persistence (DB/Network etc)
The scenario is:
1. Activity launch (main/launcher)
2. Notifies Application about performing a data transaction
3. Upon receipt of data response, controller devices which Activity to launch (or update existing)
4. Application has overridden the method onConfigurationChange
Problem: When the orientation is changed, the Application is notified about onConfigurationChange but:
a) The "current" activity is Destroyed and recreated -- which is fine to some extent b) The new instance which is created is automatically => onCreate, onPause, onStop, onDestroy.... now that's catastrophic.
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Nov 24, 2010
In onCreate method of Activity, it binds to a remote service and makes use of AIDL intefaces. Is it required to unbind from the remote service when onDestroy is called on screen orientation change.?
If the activity un-bounded from the remote service in onDestroy and if no other contexts are bound to remote service, is remote service likely to get stopped losing the state that it maintains.?
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Nov 11, 2010
I'm opening an Activity using this:
startActivity(new Intent(Parent.this, Child.class)); And on the child, I have this code on the onCreate function (the if contains more than just true, of course): public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); if (true) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setPositiveButton("OK", null); builder.setTitle("Error"); builder.setMessage("Connection error, please try later.") .show(); finishActivity(0); return;}}
Why is the activity not closing? I get the alert box, but then I have to tap the "back" button to go back.
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Jul 21, 2010
I understand that Android Activities have specific lifecycles and that onCreate should be overridden and used for initialization, but what exactly happens in the constructor? Are there any cases when you could/should override the Activity constructor as well, or should you never touch it?
I'm assuming that the constructor should never be used because references to Activities aren't cleaned up entirely (thus hampering the garbage collector) and that onDestroy is there for that purpose. Is this correct?
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Nov 19, 2010
I know that network activity and expensive operations should not be done on the ui thread, but what about database activity?
I have an activity that, when started, I query an sqlite database and dynamically populate rows in a tablelayout with an inflator. I do this all in the oncreate() method. Should this be done in a separate thread?
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Sep 30, 2010
Android will call onCreate() of my activity whenever it is launched.
In the onCreate() of my activity can I tell what intent launches my activity?
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Feb 10, 2010
As you can see, I first create a webview. Then, I want it to immediately disappear. Then, I want the Listview to come up. But the problem is, I can't do Listview if I don't do ListActivity but then I can't do Activity. Code...
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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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Aug 9, 2010
I have a need to capture some user input when an activity opens for the first time. I'm hoping to give the user a list of options to select from, which will be pulled in dynamically. I'll then store the selected value locally for future use. I'm not finding a way to do what I'm after and was wondering if anyone has run into this before and how they solved it.
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Mar 29, 2009
I launch my TestWebView activity. After my web page is loaded, I put the app in the background by pressing the Home key. Then I bring the TestWebActivity back to the foreground. Unexpectedly, TestWebView's onCreate() is called when I bring the activity to the foreground. But onDestroy is never called. This same thing happens every time I tested. It appears the old TestWebView was not completely killed so there are possibly duplicate web clients running.
My code: .....
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Sep 28, 2009
My activity bind a service. I want to call the service's function in activity's onStart/onCreate function, but it doesn't work. The service started sunless but the connection is null. When I just call the service's function in other function (onClick for example),
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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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Aug 18, 2010
I am new to Android and this is my first question here so please go easy on me.
Is it possible to check some condition inside onCreate() of an Activity and display an AlertDialog?
I am creating an AlertDialog anonymously in Oncreate() and calling show on that instance but the AlertDialog is never displayed.
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Sep 4, 2010
I use Microsoft Outlook 2007 as my MAIN email and calendaring software. I will be accessing my mail and calendar via Outlook on my office PC for the vast majority of time.
My main email accounts are currently configured as POP3 but are also configured to leave copies of messages on the server for 30 days, which allows me to check new messages via my ISPs webmail when out of the office.
I have considered changing to IMAP for my main email account but have purposely avoided it up to now as I have a huge number of mail folders and messages my Outlook pst file is currently 7.2GB. A lot of those are for archive reference and I dont need to see them on other devices BUT, as I understand it, IMAP does not let me only select certain folders to mirror and sync between different devices (it must sync all of them) so I feel it would be unwieldy to use IMAP on my account. (If anyone knows of a way to set IMAP to only include specific folders please let me know!).
I do have a Google Mail account already, but rarely use it its just there as a back-up account. I�ve NOT as yet imported my Outlook contacts or calendar into my Google account.
Now I know that I can use HTC Sync to sync up my Contacts and Calendar, but what I�ve read suggests that the phone works best when you sync it with your Google account. I COULD of course import my Outlook Contacts and Calendar into my Google account, and I COULD also use my Gmail account to check mail from my main POP3 accounts. However, Im unsure about going down that route as Im worried that might confuse things, cause conflicts, or cause double-work for me when I update my contacts or calendar from Outlook or from Google. Are there possible problems with going down that route?
Secondly, Im very intrigued to have read that Gmail is more efficient for the phone as Ive read it works as a push email service. That is, I dont need to check my mail by doing a send/receive from my phone either manually or automatically at set intervals, but that Gmail will just automatically PUSH new emails to my phone as soon as they arrive. Is that correct?
If it is correct it sounds good, but does that mean my phone must be or will be permanently connected to the net? As I don�t use my mobile that much Im on a Pay-As You-Go service so need to ensure my phone is ONLY connecting to a data connection when I need it to. Will I be able to work-around this?
I know HTC Sync doesn't transfer Outlook Notes or Tasks. Has anyone found, or can recommend, an app that will do that for me?
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