Android :: More Usual To Persist Data When Developing Android Applications

Jul 1, 2010

I'm developing an application that would need to persist data locally in Android devices. I'm aware that Android provides two packages for database persistence, the normal "java.sql" and the "android.database.sqlite"? Which one is used more for persistence? I suppose that "android.database.sqlite" is the implementation of "java.sql",

Android :: more usual to persist data when developing Android applications


Android :: Trying For Developing Phone Rest Client Applications

Jun 8, 2010

I've watched many of the Google IO talks and one that I'm trying to reproduce is "Developing Android REST client applications"[1]. In this talk Virgil suggests you should not execute your RESTful queries inside a Thread/AsyncTask spawned from your Activity (which I had been doing), instead you should use a more complex architecture that uses a combination of a ContentProvider and a Service. From what I understood the reason for this design was so your data was more persistent between app restarts, and so your queries don't disappear if your Activity starts/stops (e.g on a screen rotation). I buy into both those reasons hence I'm trying to implement this. On the slides[2] page 45 We have an Activity calling a ContentProvider. Now the ContentProvider checks its local database, if the content is not there it sends an Intent to a service which fetches the content, inserts it into the ContentProvider, then the ContentProvider calls back to the Activity (with a ContentObserver) and the Activity can carry on. The question I have is how is this callback setup. The ContentProvider exposes simple methods, query, insert, update, delete which don't seem easy to adapt to a callback interface. It could be implemented by a Cursor which is designed to block, but that could be problematic as you don't' want to block your UI Thread. I'd appreciate if anyone could make this clearer to me, or show me some code. I'm hoping the Twitter app will be open sourced soon which apparently uses this architecture.

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Samsung :: Developing Android REST Client Applications

Sep 1, 2010

I've read through the note of the topic "Developing Android REST Client Applications" from Google IO 2010, but I still have no idea on how to start. Can anyone show me a code example? Either the code for "Option A: Use a Service API" or "Option B: Use the ContentProvider API"

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Android :: Developing Android Applications Require A Rooted Device

May 5, 2010

I am looking generally in to Android development.

I keep seeing information on root however I am unclear how this relates to general android app development.

I understand that there is an emulator however when I get to actually test the software on a phone does that phone have to be a rooted device or is this only required if you wish to edit the core features of the os?

Finally are there are any development disadvantages to rooting the device such as that is no longer behaves like other android phones I may deploy too?

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Android :: Developing Android Applications On A Shared Server

Jan 27, 2010

We are trying to use a shared server (Ubuntu 9.10 64-bit) to develop Android applications. The thought is that a number of developers should use the shared server for development. We have overcome some obstacles such as setting the base port for DDMS. So it is possible to run multiple emulators and multiple instances of Eclipse. But we run into problems when trying to debug applications from Eclipse. It seems as though all emulators are trying to connect to the same Eclipse instance when debugging.

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Android :: Best Practices For Developing Bigger Applications On Android

Nov 24, 2010

I've already written some small Android Applications, most of them in one Activity and nearly no data that should be persistent on the device.

Now I'm writing an application that needs more Activities and I'm a bit puzzled about how to organize all this. My app will download some data parse it show it to the user and then show other activities depending on the data and the user interaction. Some of that data could be cached, some of it has to be downloaded every time. Some of that data should not be downloaded freshly at the moment the orientation changes, but it should on the moment the activity is created...

Another thing I'm confused about are things like a httpClient. I now for example create a new httpclient for every activity, the same thing for locationlisteners.

Are there books, a blogs or documentations with patterns, examples and advice on organizing larger apps build on android? Everything I found until now are get startet tutorials leaving me alone after 60 lines of code...

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Android :: Developing Android Applications With An HTC Tattoo Phone

Apr 3, 2010

Has anyone managed to develop Android Applications using Eclipse on the Windows platform. I understand the ADB needs to recognise specific models of phone and wondered if the Tattoo is supported.

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Android :: Titanium Works In Developing Android Applications

Aug 28, 2010

How Titanium works with android? And it is easy to work with titanium for developing android applications?

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Android :: Developing Native Applications To Run Both On Android And IPhone

Sep 20, 2010

I wonder whether there is any way to develop native apps (HTML-based apps is another story) that would run both on Android and iPhone? I know that there exist applications available for both OSs, so I wonder how are they ported/developed for both targets?

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Android :: Start Developing Applications For Android

Apr 27, 2009

How to develop applications for Android. I downloaded the Android SDK but I don't see where to begin.

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Android :: Using Android To Developing Facebook Applications .

Apr 20, 2009

I try to use facebook-java-api to wrote my android application . but I got some problems . when i import all the libs in facebook-java-api,My eclipse Could not find my apk.

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Android :: Developing Android Applications

Jul 9, 2010

I am a new Java programmer. I want to learn how to develop Android applications. If someone could name the best IDE, books and websites.

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Developing App / How To Save Internal Data

May 2, 2012

I've been developping an app and I need to save internal data.Here is what I have;

Code:
private void ChkFile() {

file = getBaseContext().getFileStreamPath(filename);

String text;[code].....

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Android :: Android Developing For Tablets Harder Than Developing For IPad?

Apr 17, 2010

First of all, I just want to say I am a software developer, but I am not an Android developer. However I usually walk around and think on stuff. AndI've been recently thinking all the news concerning how fragmented Android is getting, with different Android versions and tweaks by different phone manufacturers, and then for developers you have different size formats. An example would be that HTC Tattoo might not be able to run everything that another phone might run, due to different screen formats, etc. And now the Android tablets are coming with different Android versions and different screen sizes, all from 5" to 11". Will this make developing Android applications harder? Apple has it safe here since they manufacturer all devices that run the iPhone OS: the pods, phones and now the pad so they can easily control and make sure not to loose any customers by introducing a new device. When Apple introduced iPad they had to make sure that all the old iPhone applications would work on the iPad. They solved that neatly by saying that iPhone applications will simply be stretched out to the double size and it would fit on the iPad. Unfortunately Android does not have the same luxury to do this. As I said, I am not an Android developer. Just a curious software developer For you guys who work actively in the Android community, does Google have a solution for this? Will you be able to run phone applications on the tablets? Is there a bridge between the devices? Are there any standardizations or will Android development become even more fragmented? you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-devel

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Android :: How To Persist A Bundle?

Jul 27, 2009

I'm well aware of onSaveInstanceState(Bundle b) and the corresponding onCreate and onRestore. What I want to do is persist the bundle somewhere simple where I'll only ever have one at a time. The functionality is to be able to resume a game from its previously stored state - not to be confused with restoring the activity during its lifecycle. I want to restore it AFTER it's been destroyed (think of turning the phone on and having a button on the game that says, "resume last game". My thoughts are that if I can just persist the bundle that I normally use for the instance state, then I should be able to reload it later upon user request. I don't want to use a provider because they seem way too over the top for what I'm doing.

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Android :: Persist File When App Closes

Jun 14, 2010

I am creating a file in my Android application as follows:

code:..........

And I write to the file during the running of the app as follows:


code:..............

This works fine but when my app closes the file gets deleted and when the app is run again all the information I wrote to it is gone.

How can I make sure the file persists even after closure of the app?

Update:I have changed MODE_PRIVATE to MODE_APPEND and the problem is fixed.

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Android :: Do Scheduled Alarms Persist Between App Upgrades?

Jun 3, 2010

My app schedules an alarm,with the alarm scheduled, what happens if I release a new version of my app, and the user upgrades the app? Will this alarm be removed? Or will it be left untouched, and fired as expected?

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Android :: Disable Home And Other Buttons To Persist App?

May 6, 2010

I am building an app which uses a WebView. This app runs at startup. Is there a way to maintain the app running(persists) even if the user presses the 'Home' or 'Back' button? In other words,pressing the 'Home', 'Back' or the other buttons shouldn't close the activity.

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Android :: Way To Persist Graphics On A Canvas (map Overlay)?

Feb 16, 2009

I've been searching around and can't seem to find a way to do this properly. I am doing some tracking where I want to draw dots on a map overlay recording previous positions. When onDraw of the overlay is called it seems the canvas is cleared so I have to redraw all of the history on every invocation. This could result in several thousands of dots being draw over time which seems to not be very efficient. Is there some flag somewhere that I have not found which tells a map overlay to be persistent? Or is there some way I can save and restore the canvas so I'm only maintaining/drawing the current point on each onDraw?

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Android :: Will WebView Cache Persist Between Application Runs?

Mar 16, 2010

I have a WebView. I'm not quite sure how caching works for it. Ideally I'd like to load a web page from the network once (images included), then from then on only ever load it from the local cache. I'm not sure if we have this level of control over webview. Will it at some point just auto-clear the cache? How could I tell? I need to be sure that it's really keeping the page cached between different runs of my application.http://developer.android.com/reference/android/webkit/WebSettings.html.

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Android :: How To Persist Options Selected In AlertDialog Spawned From ItemizedOverlay OnTap Method

Jun 7, 2010

In the description of how to add a list of options to an AlertDialog the official Android documentation alludes to saving a users preferences with one of the "data storage techniques." The examples assume the AlertDialog has been spawned within an Activity class.

In my case I've created a class that extends ItemizedOverlay. This class overrides the onTap method and uses an AlertDialog to prompt the user to make a multi-choice selection. I would like to capture and persist the selections for each OverlayItem they tap on.

The below code is the onTap method I've written. It functions as written but doesn't yet do what I'd hope. I'd like to capture and persist each selection made by the user to be used later. How do I do that? Is using an AlertDialog in this manner a good idea? Are there better options?

CODE:.......................

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Android :: Backup Applications Data

Jul 26, 2010

I want to backup my application's data in Android Cloud's Storage. I have some questions regarding this,

1) To backup the data it needs Backup Transport. What will happen if the Backup Transport is not present on the Android device?

2) Will Android Backup Service provides any Backup Transport(if not available on the device) when the application get registered with the Android Backup Service?

3) How to store the data present in the SQLite database to Cloud's storage?

4) If i distribute my application to many users. In that case how the data backup will happen?? How the Android Backup Service will get the primary google account present on the device if it contains more than one google account?

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Android :: How To Share Data Between Applications With No Dependency

Sep 19, 2010

I want to share data between 2 applications. the idea is both applications can write and read the SAME data and there is no dependency which one of the apps is installed or first created the data. I have 2 version of the same app: regular and premium and I don't know which of them will be first installed and both of them can change it.I tried to use ContentProvider but the problem is that only the first app can create the Provider and when it is uninstalled it deletes that custom Provider. I want the Content to be kept for the second app. Also, I tried to use Settings.System which keeps the data regardless if the application is installed or not but I don't want to use the permission for that (it is very problematic from user perspective). BTW, it seems that I can change ANY of the Settings.System which is not secured from Android OS perspective - but this is a subject for other post.

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HTC EVO 4G :: Why New Email LED Indicator Not Persist Longer?

Jun 17, 2010

How do I make the "new email" flashing green LED continue to flash forever or until I mess with the phone? It works fine, but stops flashing after a while so if I'm not staring at my phone, I could miss the LED indicator and not realize I got a new email. Using the Gmail application (not the HTC email program).

What causes the LED to stop flashing after a while? Is it because the phone is going into a deeper sleep mode that I could configure, or is it because the flashing LED indications stop and there is nothing you can do about it? I checked under notifications and didn't see any setting for "duration" of the flashing LED indicator for emails.

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Android :: Should I Use XML / JSON As Data Format In Droid Applications?

Feb 23, 2010

I'm starting to develop an application for Google Android and heavily relying on a web API that can deliver data in a restful way via json or xml. I now have to decide which library to choose.

I saw that google includes org.json classes in the API but haven't tested them yet.

How are your experiences? What library/API should I use and why?

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Android : ContentProvider - Other Applications Exactly Manage To Access The Application Data

Jul 25, 2009

I have some questions about how the ContentProvider works behind the scenes.

1. The ContentProvider class is registered in the kernel when the application is installed and then what? Or how do the other applications exactly manage to access the application data?

2. When is actually onCreate called? The documentation is pretty vague...

3. What happens if two applications register the same provider class? (I have more applications that must communicate between eachother. The content provider must be registered, of course, along with the first application installed on the system. The problem here is that I don't know which one will be, so I want to deliver the ContentProvider with all the applications)

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Android :: Content Provider That Return Data Listing Installed Applications

Jul 19, 2010

Is there a standard native Android content provider that will return data listing all of the apps currently installed on the cellphone. Something like open()/readdir() on a Linux bin directory.

Given that you know an app is installed on an Android cellphone, and you know that apps name, how do you launch that app from a completely different and unrelated app. You might not know which Intents/Broadcasts/URIs the app you want to launch is listening for. And not all Android apps are written to respond to Intent/URI broadcasts or requests.

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General :: Factory Data Reset On Rooted Android With Some System Applications Removed?

Dec 27, 2012

I rooted my phone to uninstall some bloatware system apps several months ago. Now, I need to perform a factory data reset just to remove the Google account associated with it. Is it safe to do so or will I lose any further system apps or worse, brick my phone? I have the apk's of the system apps that I removed, but for some reason I am not able to restore/install all of them. I used ES File Explorer back then to remove those apps. [My phone is Samsung GT-I5801 running Android 2.2]

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Android :: Select Android Applications Sharing Data Without User Notification

Sep 30, 2010

Come one, come all -- let's gather and act shocked, shall we? It's no secret that Google's Android Market is far easier to penetrate than Apple's App Store, which is most definitely a double-edged sword. On one hand, you aren't stuck waiting a lifetime for Apple to approve a perfectly sound app; on the other, you may end up accidentally downloading some Nazi themes that scar you for life. A curious team of scientists from Intel Labs, Penn State and Duke University recently utilized a so-called TaintDroid extension in order to log and monitor the actions of 30 Android apps -- 30 that were picked from the 358 most popular. Their findings? That half of their sample (15, if you're rusty in the math department) shared location information and / or other unique identifiers (IMEI numbers, phone numbers, SIM numbers, etc.) with advertisers. Making matters worse, those 15 didn't actually inform end-users that data was being shared, and some of 'em beamed out information while applications were dormant. Unfortunately for us all, the researchers didn't bother to rat out the 15 evil apps mentioned here, so good luck resting easy knowing that your library of popular apps could be spying on you right now.

Update: A Google spokesperson pinged up with an official response to the study, and you can peek it after the break.Update 2: Looks as if the full study (PDF) has been outed, with the 30 total apps named. Here they are: The Weather Channel, Cestos, Solitaire, Movies, Babble, Manga Browser, Bump, Wertago, Antivirus, ABC - Animals, Traffic Jam, Hearts, Blackjack, Horoscope, 3001 Wisdom Quotes Lite, Yellow Pages, Dastelefonbuch, Astrid, BBC News Live Stream, Ringtones, Layer, Knocking, Barcode Scanner, Coupons, Trapster, Spongebob Slide, ProBasketBall, MySpace, ixMAT, and Evernote.

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Motorola Droid :: SMS Vs Data - Applications Such As Meebo

Nov 27, 2009

When does the Droid use SMS?
When does the Droid use Data?

For applications such as Meebo, I'm reading that each message on an IM client counts as a text (Instant messaging counts as text messaging?) . However, I'm also reading otherwise. So is something like Meebo on Data or SMS? I got only 500 texts because I thought it was data.

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