Android :: ContentProviders And Concurrency ?
Jun 18, 2009
I am currently writing an app that asynchronously populates a ListActivity. Therefore the query on my ContentProvider is done by a separate thread, not the UI thread. Furthermore the ContentProvider is synchronized by a service in the background. Since this may be a lengthy operation the service also uses its own thread. My question now is: Do I have to do some locks by myself to support concurrent accesses by both reader and writer (in the ContentProvider) or is there already taken care of when inheriting from ContentProvider and implementing the methods? Which thread runs a ContentProvider? Some Binder thread or the calling thread?
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Jun 26, 2009
I am replacing the multithreaded code in my app with the AsyncTask from 1.5. I found that two AsyncTasks do not work concurrently. I investigated a bit and found a workaround; I would like second opinion if my solution is right. OR if there is a better solution.
AsyncTask allows the app to do a task on a thread other than the UI thread. But IIUC, it only provides a single thread on which a queue of tasks is performed. Therefore, if one of the task is to wait on some event (n/w or sleep) then all other tasks will wait for it to finish.
To elaborate with the coding example: <code>
public class MyTask extends AsyncTask<...> { ... }
On the UI thread execute two tasks MyTask mt1 = new MyTask().execute(args);
MyTask mt2 = new MyTask().execute(args); </code>
In the above code both the execute calls will return immediately and free up the UI thread; however mt1 will be executed first and mt2 will have to wait until mt1 finishes.
Thanks to the android's open source, we can see implementation of AsyncTask. http://google.com/codesearch/p?hl=en&sa=N&cd=2&ct=rc#uX1GffpyOZk/core...
I copied AsyncTask.java as UserTask.java in my project and changed the value of CORE_POOL_SIZE to 5. This makes the thread pool to use 5 threads to multiplex the queued AsyncTasks. This indeed solved my problem. Now if mt1 blocks on a sleep; mt2 goes ahead and finishes its job.
Here are some questions for those who know more about AsyncTask implementation:
Is this work-around right? If yes, can the CORE_POOL_SIZE be made configurable in future, via an API call? Is there a solution by which multiple thread pools can be used?
Let me add that, I am aware that this is a phone and not a web server - I am not using 10s of threads to do network I/O. However a single thread is not sufficient for my app either.
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May 11, 2009
The Android code on how ContentProviders work, and to me, it looks like any ContentProvider I query actually gets placed entirely in the memory of the requesting application. Are they really stored in the querying application's memory? For some reason I thought the cursors were lazy.
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May 26, 2010
I have written a content provider over a database table which essentially captures phone contacts information.
So at a point of time, in my application code, I want to query the android contacts content provider, and insert that information into my Database table through the content provider.
For this I have to query the content provider from android, get the cursor, loop over the android contacts, for each contact, insert using my URI, this becomes very bulky. Is there any work around? A bulk insert mechanism of some sort? Or at least pass an object to a URI, which can be the android cursor.
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Aug 30, 2010
I am using the default Android Media Player in an Activity, trying to play back a couple of video files. However I have a problem with programming what I want. The desired program outcome would be the following:
A video file is played back After that, a dialog is shown, asking the user something A pause of 5 seconds occurs The next video is shown and so forth. How am I to program this? Currently, I use a paradigm like the following:..................
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Oct 19, 2010
today i meet the problem.i need technic can control the android machine from server.then i want send data from server to android with no request from android.
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Apr 14, 2010
I'm trying to open a dialog window, but every time I try to open it it throws this exception:
CODE:.................
I'm creating it by calling showDialog with the display's id. The onCreateDialog handler logs fine and I can step through it without an issue, but I've attached it since it seems like I'm missing something:
CODE:............
Is there something missing from this? Some questions have talked about having this problem when creating a dialog from onCreate, which happen because the activity isn't created yet, but this is coming from a call from a menu object, and the appContext variable seems like it is correctly populated in the debugger.
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Jun 3, 2010
I'm writing an application which connects to a back office site. The backoffice site contains a whole slew of JavaScript functions, at least 100 times the average site. Unfortunately it does not load them, and causes much of the functionality to not work properly. So I am running a test. I put a page out on my server which loads the FireBugLite javascript text. Its a lot of javascript and perfect to test and see if the Android WebView will load it. The WebView loads nothing, but the browser loads the Firebug Icon. What on earth would make the difference, why can it run in the browser and not in my WebView? Any suggestions.
More background information, in order to get the stinking backoffice application available on a Droid (or any other platform except windows) I needed to trick the bakcoffice application to believe what's accessing the website is Internet Explorer. I do this by modifying the WebView User Agent.Also for this application I've slimmed my landing page, so I could give you the source to offer me aid. package ksc.myKMB;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebSettings;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class myKMB extends Activity {
I already have JavaScript on the web browser on, the problem is the web view is acting to different from the web browser.
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Aug 15, 2010
I want to implement my own Tokenizer base on the file
"MultiAutoCompleteTextView.java",
but I encounter an error "com.android.internal.R cannot be resolved" when I try to
import "MultiAutoCompleteTextView.java" to my project.
code:.................
I haven't research any solutions to resolve this problem.How to correct "com.android.internal.R.attr.autoCompleteTextViewStyle" my own attr?
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Jan 11, 2010
1- Does Android Browser (Éclair code base) support the "plug-in" or not?
2- Why "Google Gears" support is removed from the clair code base?
I searched the forum and came to know that earlier version of the Android does not support it at all? Here is the link for that, but this query asked in Dec'2008.
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Jan 5, 2010
At first,I have a database created by using Ruby on rails.I just already implement insert function(HTTPPost) in my Android Application and it's work.But I don't know how to retrieve specific record from my databases and insert it back to specific record in Android (Like edit function in RoR)This is my insert code :
private void insertComment() {DefaultHttpClient client = new DefaultHttpClient();HttpPost post = new HttpPost("http://10.10.3.87:3000/comments");
// Configure the form parameters
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
nvps.add(new BasicNameValuePair("comment[content]", t_comment.getText().toString();
nvps.add(new BasicNameValuePair("comment[id_account]", "1"));
nvps.add(new BasicNameValuePair("comment[id_place]", Integer.toString(position)I really try many ways out but it doesn't work and it takes very long time to fight with this piece of code. Actually, I really don't know how to specify RowID to HTTPPost.
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Sep 17, 2010
I am doing some android development, and now I need to send some android application generated data onto a remote server (a database)?How can I do that? can I use direct JDBC connection and sql?
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Oct 9, 2010
So i am making a android app, and i want it to be so if i call lets say 911 it sends my GPS coordinents to a certain IP, i know everything but how i make it so if i call 911 it sends the info and how i can make it send the info to the IP via 3g,
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Jul 10, 2010
I released updates of my apps yesterday and they are being hidden from android 1.5 and 1.6 phones.
This is due to a Market bug which hides apps with bluetooth permissions from android 1.5 and 1.6.
Come on Google fix the market. We spend countless hours making are apps work on ALL android versions and now you do this...
This issue has been raised since June, but has only affected me since i made an update to the market yesterday.
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Dec 23, 2009
What exactly are mock tests... I need to know the mock and performance tests available in android for testing android apps..what is the best tool for testing android apps and how..
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Aug 17, 2009
I'd like to add a menu option to the Android camera app. Is this possible to do using the current SDK? I know I need to add an intent-filter tag in my activity. But I don't know what I should put in the mime type. I want to be able to process the live camera previews if the user selects the menu option. So what do I put into the type tag of the intent-filter? Also I suppose I won't be using ALTERNATIVE or SELECTED-ALTERNATIVE for the category as I want to deal with the whole intent?
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Jan 21, 2010
I was wondering if the market checks if the application can be installed on the device. For example, if I have an Android 1.6 and if I try to install an application with :"<uses-sdk android:minSdkVersion="7" />" on its manifest. What will happend ?
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Jan 27, 2010
I have a question about bluetooth RSSI functionality on the Android (either 2.0 or 2.1):
It's easy enough to get the RSSI value when a bluetooth connection is created, but how can you repeatedly get the RSSI value of a connection that is already active? It's really important to be able to do this, because this lets you determine if bluetooth devices are close to each other or far away, but I can't find any appropriate function calls in the Android API.
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Feb 5, 2010
I am having a bit of a problem with my Android. So what happened was I downloaded "DroidRootPro" from the market. I rooted my phone with this, installed the 800MHZ ROM image, rebooted and the phone came up great. I was actually surprised on how fast it became. Once the phone came back up, I tried installing one of the custom themes that came with that app (I know I should have left it alone). The phone than rebooted and I was never able to bring it back up. It gets stuck in this endless loop where it tries to boot but doesn�t get past the "Droid" splash screen, it just keeps rebooting every time.
Things I have tried:
-Wipe data/factory reset (in recovery mode), no go.
-Wipe cach partition, no go
-Restore from a "nandroid" backup, no go. I tried pretty much every combination of restores and am unable to bring the phone up.
Is there anyway I can download the factory image that comes with the phone, put it on an SD card and restore to that? I have looked all over but cant find any information on this.
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Sep 29, 2010
I am trying to develop an app to supplement the built-in music player. I've used git to download the com.android.music package and looked around at its code. I can launch the music player by copying some of its code and launching activities with intents.
Now what I need to do is get a handle to its current view. In the MusicUtils.java file, I see a line that says
View nowPlayingView = a.findViewById(R.id.nowplaying);
I'd like to do the same thing. Only I don't have access to the R.java file, so I can't write e.g. R.id.nowplaying. How do I do this? How do I reference the music players R.java? I do know the R.java stuff is declared public so that shouldn't be a problem. Right?
Is it even possible? I saw this related question and am now wondering: http://stackoverflow.com/questions/2437271/how-to-load-com-android-music-code-into-eclipse-and-compile
I'm working against the Android 2.2 SDK, but it'd be helpful to know if the answer is different for older versions such as 1.5.
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Aug 26, 2010
I am developing an application using com.google.android.maps.jar It is OK to develop it with Eclipse SDK. but an build-error happens when building system.img with GMS licence (com.google.android.maps.jar is already installed at out/target/common/ obj/JAVA_LIBRARIES/com.google.android.maps.jar_intermediates/ com.google.android.maps.jar)
make: *** No rule to make target `out/target/common/obj/JAVA_LIBRARIES/ com.google.android.maps.jar_intermediates/javalib.jar', needed by `out/ target/common/obj/APPS/LifeStory_intermediates/classes-full- debug.jar'. Stop.
Here is my Android.mk
CODE:.............
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Feb 23, 2010
I have a very simple AsyncTask implementation example and have problem to test it using Android JUnit framework. It works just fine when I instantiate and execute it in normal application. However when it's executed from any of Android Testing framework classes (i.e. AndroidTestCase, ActivityUnitTestCase, ActivityInstrumentationTestCase2 etc) it behaves sarngely:
- It executes doInBackground() method correctly
- However it doesn't invokes any of its notification methods (onPostExecute(), onProgressUpdate(), etc) --
just silently ignores them whitout showing any errors. This is very simple AsyncTask example................................
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Nov 26, 2010
I was woundering if i bought a Cell Phone with out a Data Plan that had Android WiFi that i could still access the Android Network when I was in a WiFi area?Is Android WiFi Apps the same as Android Mobile Apps?
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Dec 28, 2009
Android APK-Files are not binaries but byte-code-files. So is it possible to install the same APK-File on both - on x86-Android-Devices and ARM-Android-Devices? There are some x86-Netbooks with Android installed planned and I wonder if it is possible to run the APK-Files on both kinds of devices?
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Jun 17, 2010
I started developing android applications. And am testing with the android emulator. Do I really need android phone before releasing it for public usage?
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Jul 29, 2009
More or less as it says on the tin. Before I even contemplate downloading the SDK, I was wondering if there was any way of testing Android apps that I'd write without an Android phone available to me? I'm unsure as to whether or not the tools that come with the SDK come with an emulator like VS does for Windows Mobile.Sorry if this is a stupid question, but maybe I'm searching for the wrong thing.Edit I don't suppose there's anything that'll let me write widgets on/for an emulated version of the interface HTC use on the Hero/G2 either is there? Not that it would matter that much.
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Jan 7, 2010
I am trying to create a mail sending application in android, If I use
`Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND`);
This will launch the builtin application of android, I'm trying to send the mail on button click directly without using this app.
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Jan 30, 2009
I can't seem to get anything back from https://dl-ssl.google.com/android/eclipse/ - even accessing from a browser just gives a 404.
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May 1, 2010
I don't currently own an Android powered smart phone, but have been playing with the emulator on my PC for a while. My brother recently bought some generic touch screen MP3/video players (PMP devices) off eBay. They look like an iPod Touch, and have a very similar interface, and I was wondering if I'd be able to flash these devices with Android instead?
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Jun 12, 2010
How can we pass Android Home Screen Widget info ( putExtra maybe ) to an Activity.. What particular method callback will handle this one?
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