Android : What Is The Lifetime Of A ContentProvider - After OnCreate
Aug 17, 2010
What is the lifetime of a ContentProvider in Android? After onCreate() is invoked, will the ContentProvider persist unconditionally for the lifetime of the process?
My ContentProvider manages a list of records, but only 1 is designated "active" and will be accessed by different applications a lot. I was wondering if it's safe to cache the index of this active record in memory as a member of my ContentProvider to speed up lookup.
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Feb 7, 2010
My application after an update needs to fill its ContentProvider with some data found on the server.
I found that starting a service from the ContentProvider.onCreate() method works but I'm not sure if it is a good idea or if it works randomly.
I don't know the initialization of an application in android. Are the services always already available before the content provider is created?
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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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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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Nov 23, 2009
I'm extending ActivityGroup class and implemented a custom tabHost and widgets for my app. Can someone shed a light on how are the Activities fife-time inside an ActivityGroup?.
Im getting a weird behavior when using the following code to send a new intent to the current sub-activity, then change tab, and getting back to original tab. (TAB1 -> TAB2 -> TAB1)
CODE:.......
What i see from debug..
onSaveInstanceState() is called on TAB1, then TAB2 is current subActivity, but when going back to TAB1 onCreate() is called.
onCreate() is not called with the same test without using the onNewIntent() described above.
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Mar 24, 2010
I recently formatted my computer and updated to Windows 7. I backed up my keystore and tried to sign my apk with it but it gave me an error that said my certificate expires in 22yrs. which is just shy of what the market requires to upload the apk. So now I am stuck not being able to update my app... Is there a way to extend the lifetime of certificates so that I can update my app?
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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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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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Dec 10, 2009
I'm not sure if the screen on the Droid is OLED or regular LCD. I know that leaving an LCD on for hours at a time can possibly shorten the life of the backlight... Anyone know what the case is here?
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Sep 25, 2010
Does the battery lifetime takes a hit if I let it charging after it's been fully charged? For example, letting the phone charging overnight...
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Jan 12, 2010
Just caught wind of this and thought I'd pass it on. I can see some others have talked about the program and this article also includes instructions on how to securely install on a rooted phone. AndroidSPIN | You heard it here, first, on AndroidSPIN. Your No.1 source for Android news. Blog Archive Free lifetime Wave Secure accounts for Android users till 31 Jan 2010. Download from Market today!
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Dec 17, 2009
We are developing a ContentProvider which is supposed to serve for specified packages. So we want to get the caller package name. Is there any way to achieve that?
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Apr 6, 2010
I currently register a content observer on the following URI "content://sms/" to listen out for incoming and outgoing messages being sent.
This seems to work ok and I have also tried deleting from the sms database but I can only delete an entire thread from the following URI "content://sms/conversations/"
Here is the code I use for that
CODE:............
However I want to be able to get the recipricant and the message text from the SMS Content Provider, can anyone tell me how to do this?
And also how to delete one message instead of an entire thread?
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Aug 14, 2010
I have a ContentProvider which is declared in the Manifest, when is it really created ? When the application is launched but before launching the first activity ? When the first query/update/insert is done ? When ?
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Jun 29, 2009
I want to add an extra field to the phonebook on android. The field contains a new contact method and when clicked it should start my own application/intent. I have created my own content provider that stores the information. I want to add this contentProvider to the phonebook in the same way organizations and email are added to the phone book. So how do i do this? I tried adding a new contact method but the field KIND needs an integer input which seems to be predefined to some specific methods (EMAIL, IM, ADDRESS etc)
So do i need to add a new type of KIND or can I link my contentProvider to the phone book so that it shows up as an extra field in the phone book?
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Aug 24, 2010
All the example codes, tutorials or video I see, there is always one ContentProvider per SQL Table with the SQLiteOpenHelper extension defined as a private static class... Is it some sort of standard design...to have one ContentProvider per SQL Table? Or I can define one generic ContentProvider and use its instance for ever update? Is there some issue with that? Could anyone please help as my application has like 5-6 tables.
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Aug 18, 2009
Maybe it's an easy question, but I've tried to understand why all the content providers seem not to close the DB that they use. In the NotePadProvider example (in other providers is similar), it's used a Helper to manage the DB (that extends of SQLiteOpenHelper).
This helper has a method to close the DB (http://developer.android.com/ reference/android/database/sqlite/SQLiteOpenHelper.html#close%28%29), but in all the providers that I have seen (even in the example), this method is never used.
For example, in the query method of the NotPadProvider we use the helper to open a DB
CODE:...........
The mOpenHelper is create in the "onCreate()" method, but there is no reference to a mOpenHelper.close() in all the provider (maybe because there is no "close()" method in ContentProvider).
Do we need to close the SQLiteOpenHelper object? When we use it inside a ContentProvider, where is the right place to close it?
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Aug 12, 2010
I have a custom class, which represents my data-structure. This custom class is in a normal Java-library, which is included in both projects. I have one Project with a ContentProvider which provides this data to Activities of other Projects. And an other Project with an Activity, where I want to handle this data in objects of this custom class.
How can I get this data to the Activity? The Cursor [1] only supports primitive Types.
[1] http://developer.android.com/reference/android/database/Cursor.html
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Jun 1, 2010
How can I test if there's a ContentProvider for a Uri ?
I'm currently doing a query on it and checking for a null cursor, but that generates an error in the system log each time, which I don't like to do.
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Jun 20, 2010
I have an AutoCompleteTextView working with a ContentProvider that correctly pulls known information from a database when the user is typing and presents it. However, I would also like to support the automatic hints/word choice list you get when using apps like the Messaging app. I haven't figured out how to get that thin bar of word choices to appear. Can some one clue me in on how to use that in combination with my existing ContentProvider?
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Aug 27, 2009
I would like to get the contact name, contact number, and contact email id using the contentProvider. Can any one please guide me to achieve this.
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Aug 16, 2010
If I call to a ContentProvider from a Activity, which thread is ContentProvider running in?
E.g. What happens if the Activity is killed and a query is executing in the ContentProvider? Say that you have a slow network query f.ex.
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Jul 30, 2010
I am brand new to developing for android and have hit something of a stumbling block that I cant seem to get around.
Using the NotePad example, I have created my own ContentProvider to serve up data from a database that I will eventually host on a webserver. But that is lightyears away from where I am right now.
Just testing my ContentProvider has caused a bit of a headache that I cant solve. For some reason, when the provider calls SQLiteDatabase db = mOpenHelper.getWritableDatabase(); I get a null pointer exception.
Code Follows:
CODE:............
Stack Trace
CODE:......................
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Dec 5, 2009
I have been stuck at a place , strange, I have a content provider class i.e class extends ContentProvider, I want to know about the method to show the dialog to the user when upgrading / creating a content provider or database from within content provider, I tried many ways for it, but nothing seems to be working, Can anybody here direct me to the reference or can tell me the way I can show progress dialog box from within contentprodiver.
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Dec 15, 2009
In my application, I have created a ContentProvider. Is there a way for me to instantiate this ContentProvider when my apk is started? RIght now, the ContentProvider only instantiate when some one does a query.
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Dec 2, 2009
I am writing my own ContentProvider for my own application. And there is a ListView with a CursorAdapter pulling data from my Content Provider. My question is when there is a data change in my ContentProvider, how can I notify my CursorAdatper to requery the data and then have the ListView updated?
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Oct 11, 2009
I have been playing around with the SearchableDictionary sample application trying to understand it.
I set a breakpoint in DictionaryProvider.query() and verified that it's going in there when I turn on search for this application (settings > search > searchable items > Searchable Dictionary).
Then I tried modifying the AndroidManifest.xml file, changing the launch activity to .WordActivity --
CODE:..............
I also had to change WordActivity so it would startup (albeit not be useful) --
CODE:...............
My expectation was that when I ran it and typed something in the QSB (search box on the main android page), it would still trigger the breakpoint. It's like it doesn't even recognize that the app should be part of the search anymore. I try moving the manifest changes back and it goes back to working.
The thing that led me down this path was that I am trying to write my own ContentProvider, and I can't get the QSB to call my query method. So what gives with this sample code here? What is preventing (or enabling) query() to be called from the QSB?
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Oct 6, 2009
I want to operate on multiple tables. I searched a lot but everywhere I could find is single table with one content provider.
How can I use multiple tables under one content provider? How can I get result from two/three tables ?
Can I provide my own SQL select query from multiple tables in ContentProvider?
Can anybody give me any example or link where I can get idea?
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Jul 1, 2010
How can i access a content provider from a pojo? all ways i found depends on that my class extends Activity :-( api version 3
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Apr 5, 2009
How to retrieve data from two tables via the ContentProvider way? I.E. the database of Calendar application, include many tables including Events and Deleted, and some others. I want to retrive records in Events table, whose _sync_id field is also in Deleted table. Usually, we write a SQL sentence like: select (all fields in Events) from Events as e, Deleted as d where e._sync_id = d._sync_id or select * rom Events as e where e._sync_id in select _sync_id from Deleted etc. But, how can I accomplish it in the ContentProvider way? I saw ContentProvider.query take a Uri as the first parameter, but pity that I don't know how to build one that could fulfill my purpose.
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