Android : What Is Context For / Save Models In Database?
May 17, 2009
I have just started on a new application that will use SQLite for persistance and Im a bit confused over the usage of a context when utilizing the SQLiteOpenHelper.
I have a base class called Storable, which my models extend if they need to be persisted. i had intended to use a synchronized singleton database adapter, but I can't for the life of me understand how to utilize the SQLiteOpenHelper as it requires a context, which my models don't appear to possess.
I'm aware that I can get around this by not using the SQLOpenHelper - but if this restriction is in place, I would assume its to prevent people creating apps "the wrong way" for android.
What is the best practice way for saving models in the database?
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Aug 20, 2010
I'm watching the 2010 Google I/O video on this topic and I have a few questions to make sure I understand properly. Google I/O 2010 - Android REST client applications Please note I also have a very limited understanding of CursorAdapters Right now my application just has a UI layer. I've created an object called DbAdapter using some Google tutorials to create a small database and a table in that database. I've created a class I'm calling DataBroker (extending ContentProvider) to manage retrieving data from the database and calling web services to update data. Scenarios:
1) Suppose I want to display a list of items in my ListActivity. Am I correct in assuming I will write a function in my DataBroker that creates a Cursor to the table in my database that holds those items, fire up a service which launches a thread which calls a web service to get additional items, then return the Cursor to my UI thread? Doing this would likely return the Cursor to my UI thread before the web service finished, but, I'm assuming, once the CursorAdapter has a Cursor, it will automatically show any changes made to that database table, yes?
2) Now I have a list of items in my ListView. Suppose I give the user some functionality to delete an item. The user executes this functionality. It should call a function in my DataBroker which updates the row in my database corresponding to that item, setting the status column to STATE_DELETING (which will remove the row from the ListView because the Cursor has a clause excluding this state), then fire off a service that fires a thread that hits my web service, then deletes the row in the database when finished? Also, suppose I have multiple Activities, am I looking at having a static Cursor for each Activity with a list, grabbing that Cursor in the Activity's onCreate, and if that Cursor is null, hitting my DataBroker?
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Mar 26, 2010
I have created a list view that displays the names and dates of items stored in a SQLite database, now I want to use a Context Menu to modify these items stored in the database such as edit the name, delete, and view.
This is the code for the list view:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
SQLiteDatabase myDB = null;
myDB = this.openOrCreateDatabase(MY_DB_NAME, MODE_PRIVATE, null);.......................
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Sep 24, 2010
I have a activity with 3 imagesViews and a Button. Clicking on the ImageView shows an AlertDialog with a list of images (located in /res/drawable) that the user can select. I've hit a wall where I don't know how to store the images to the database that were selected in the ImageViews.
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Aug 31, 2010
In my android application,I want to save some photos uploaded from a server on my database and then reuse them later. I think I should save them in a binary format and save their links into the database. Is it the better solution? Can you give some code or an example? now I only uploaded the image and display it directly using an ImageView but I want to make it available in my application when the user is offline.
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Apr 7, 2010
I want get both Image and Text from the sqLite database and show them on the ListView, at present, I can save the text with sqLite well, but failed to save the images.
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Oct 6, 2010
I need to fill in edit boxes with first and last name.i want dabatabase which saves these once i fill the edit boxes and teh nxt tym i enter a single character it should retrieve that name.Plz provide code to me.
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Nov 5, 2010
We've been developing an Android app at work for a few months now and recently acquired Droid Incredibles (API ver. 8) to replace our HTC Dev Phones (API ver. 4).
DANG are these some sweet new toys, but unsurprisingly, they've got a few quirks...
1) It's normal for my user to let the program run for long periods without any input, but he'd still need the display to work the entire time. Can anybody suggest a function call or setting or something that will prevent the Incredible's screen from dimming while my application is running??
2) On the Dev phone, I was able to copy my application's database file (thousands of uses, that) onto the SD card's root directory and fly. I could view the directory on my PC via USB; when I released the SD card from the PC, my application was perfectly happy with it and obediently read from and wrote to the database; and I didn't have to remove the SD card, ever. That doesn't seem to be the case with the newer, better phone, though. My application seems to be reading my start up parameters properly, but all attempts to save data in my database aren't working so well unless I'm just doing something wrong. Can anybody point me to documentation specifically geared toward the Incredible?
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Aug 19, 2010
I am new to android.I want to save my name in Sqlite database when i enter the text in TextEdit and clicking the save button .I have created a database as name.db.I do know how to link the text in TextEdit and button to the database.
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May 9, 2009
I've managed to get some basic 3d stuff working quite nicely on my Android device. My question is how do you define/create more complicated 3d models? Obivously using int[] arrays of vertices hand written is quite time consuming and error prone. Are there any modelling tools that can be used?
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Oct 25, 2010
As I understand, currently there exist two of them, to relieve devs from implementing their own ones, which are -strict -servermanagedpolicy However, I'm missing a predefined policy that actually is the counterpart to the soon deprecated "copy protection mode", ie one that will check once, and then keeps silent for weeks or even months, instead of harassing users to make an online connection. So, I'd like to request to please add a third predefined policy to cater to our laziness. A policy that is the counterpart to the actual old 'copy protection' thingy. Apart from this I don't really see why an app that has been correctly installed by the market with device-based signature checks and all really needs to be checked every 5 days? Wouldn't that only make sense if the app is sort of subscription-based?
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Oct 31, 2010
Is there any portrait QWERTY models coming down the stretch besides the already announced...?
I know Motorola have several models (CHARM, DROID PRO, SPICE) but I want an open phone (custom ROMs).
The other current/announced models are basically non-existent.
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Sep 3, 2010
Is there any place where I can get AVD files to match various models of phone?
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Mar 11, 2009
How are people here loading in their models? I'm just manually parsing a OBJ file into my own model class and drawing that.
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Dec 14, 2009
I recently added a feature to my app that allows the user to send a report via a message chooser (all have chosen gmail) that helps mitigate the fact that I don't have all the physical phones to test on. Execution worked as expected on my G1 and the emulator, however, to my horror as users began sending them in most of them were incomplete! Pseudo-code of what I am doing is as follows: On my phone and the emulator, all of the packages are inserted into the email. However, most of the emails I get, even from the same exact phone model/carrier/OS version, only contain "Text1". Users that have automatic signature insertions even have that at the bottom, so it's not that the email is being cut off somehow, it's that size is apparently 0. That is the only thing I can think of. Every once and a while I will get a full email though. This frightens me because what other APIs run fine in my testing but not user phones? What's going on here?
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Mar 29, 2010
Is there anywhere a summary of Build.MODEL strings for different Android handset models? Something like:"Hero" - HTC Hero "ERA G2 Touch" - branded HTC Hero "T-Mobile myTouch 3G" - branded HTC Magic "GT-I5700" - Samsung Galaxy I'm curious what is the percent of rooted devices among my app users, but sometimes is hard to tell which device is which (and yes, I know rooted firmware can mimic vanilla one, it just usually doesn't).
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Jun 6, 2010
I am planning to develop for WP7 and Android.What is the better way to display (and traverse) 3D scene/models in term of LoD? The data is planned to be island-wide (Singapore).
1) Real-Time Dynamic Level of Detail Terrain Rendering
2) Discrete LoD
3) Others?
And please advice some considerations/algorithms/resources/source codes. something like LoD book also Okay. Side note: I am a beginner in this area but pretty well-versed in C/C++. And I haven't read the LoD book.
Related posts:
- Distant 3D object rendering [games]
- Chris Pruett's 3D benchmark for Android
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Sep 26, 2010
Anyone know if that battery used in the i7500 is the same/interchangeable with batteries used in any other Samsung phone?
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Sep 13, 2010
I am on my 4th moment in 3 months. At what point do I push them to replace it with a different model? Do I have any basis for asking for a different phone? On the plus side, I might get one that has properly functioning WIFI.
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Oct 12, 2010
I would like to know which SIMs are supported by x10 mini. This error is caused by a SIM incompatibility:http://talk.sonyericsson.com/thread/3671?tstart=0 The problem is that the phone doens't support or doesn't like some new SIM models, so, I need to ask my operator sell me a old one meanwhile SE fix this problem.I was looking over the internet and most of people that have this problem have fixed using/buying an old SIM.
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Jun 30, 2010
Looks like all of the models have something good, but all have something missing. I appreciate differentiation, but this seems silly. Tmo gets 16gb built in, but no flash or FFC (not that I would us a FFC).Sprint gets a keyboard, but not the 16gb built in.Verizon's seems the weakest features of the litter in regards to built in memory (2 wimpy gigs)Best option to me would be the Sprint verison, but with 16gb built in. BTW, where is the flash for camera on the Tmo? Crazy.Samsung should change name to Silly sung.These differences would only be good for the consumer if on the same carrier and still options are too spread out. None of the devices have the complete feature set of the models. Makes zero sense to anyone but Samsung.
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Jan 21, 2010
How can I launch a contextmenu from a contextmenu? I'm trying to replicate the MediaPlayer action that happens when you long click a song, then click "Add to playlist" in the resulting contextmenu. When you click that menu item, another contextmenu pops up with "Add to playlist" as the title, and "Current playlist", "New", and however-many-playlists-you-have defined after that.
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Nov 20, 2010
I recently created a new feature in my apps that allows the user to check if there is an update by getting an HTML page, looking through it, and comparing the versions. However, this is causing the application to force close on startup for many of my users using Samsung and HTC phones, but works just as intended on droid x, incredible, and 2. I can't get my hands on any of the phones that are currently crashing and have no idea where to start in fixing it. I use a AsyncTask to search, and start it using.
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Nov 8, 2010
ive been looking for a week now i need some help connecting to a remote database...i want my app to get data out of the database and update the database.ive tried this http://www.helloandroid.com/tutorials/connecting-mysql-database but i dont understand it.
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Aug 23, 2010
I'm trying to deploy an application with an existing SQLite database.I've been reading though the examples that are posted but they are always missing some part of the class. I feel like I'm trying to bake muffins but no one told me to use baking powder.Can someone post a full database helper class for depoying an SQLite database on Android? Edit : Delete old code because it doesn't work.
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Apr 12, 2010
I'm currently developing a Field-Service application that stores data in the local sqlite database on an android device. At some point, usually after completing the data collection rounds, the local sqlite db is to be synchronized to a remote sybase db on the server.Any suggestions as to how this could be achieved or engineered as a solution? Or even better, are there alternatives to synchronizing data in such an application?
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Apr 19, 2014
I have a Motorola Moto G 8GB which is running very low on storage (only about 800mb left). This phone does not take Micro SD cards but it comes with 50GB Google Drive storage. However i haven't used this at all. I am wondering whether i could download android apps and games to google drive, dropbox etc. Games like Real Racing take up about 1GB so i cannot download it to my phone. Can i download it to the Cloud? If this is not possible, is there any way that i could save the app data on the cloud. E.g. The Simpsons: Tapped Out is about 37mb to download off the play store, but then you must download the updates etc which are about another 250mb. is there anyway to save this 250mb on the cloud. Or any other games data.
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Nov 1, 2009
I want to build my own cloned databases of all or some of the Android native databases like Contacts, Calllogs, Mediastore, Settings, etc. I want to know wheher it is possible and How I can know the database schemas of these databases? Is there any documentation on this?
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Jul 19, 2010
I'm confused about the concept of the Context class. I see that it's a base class of Activity, but the Android docs also mentions the Context storing global information about the app environment. So in my app which has 3 activities, does that mean I have 3 distinct Context objects, or do they actually refer to 1 entity? Also, what is the lifetime of a Context object- does it live until the last component of this activity's process is garbage collected?
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Nov 24, 2010
i have got a stupid question to ask. I created a custom ContextMenu. But when i call the menu, the menu displayed will also have the default menu added in. Is there anyway for the default ContextMenu not to appear as well?Code requested: @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo)
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater inflater = getMenuInflater();
menu.setHeaderTitle("Recipients");
inflater.inflate(R.menu.menu_contacts, menu);
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