Android :: Implementing L2CAP

Aug 13, 2009

With reference to the current work at :;a=tree;...

Can you tell me how can I implement L2CAP Socket?

I need to do it ASAP for a university project. Hoping for optimistic reciprocation.

Android :: Implementing L2CAP


Android :: Implementing In App Purchases

Jan 7, 2010

It looks like Android won't natively support in-app purchases for a while, and when it does there might be a huge user base with devices that don't support them.What's the best way to implement iPhone-like (additional content or services) in-app purchases in Android using the Android Market if possible?

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Android :: Implementing Action Bar

Jun 24, 2010

I am working on creating an Action Bar like the one from the new Android UI Patterns and I am running into a bit of trouble. I have a ViewSwitcher with two layouts in it. When the user taps the search button I animate between the two layouts. The problem is that the layouts are different sizes and I can't figure out how to make them take up the same amount of space. Here's what I mean. p.s. forgive the bad art, they are just place holders ;)

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Android :: Implementing An OnClickListener?

Nov 9, 2010

I am trying to do something similar to that of the android lock screen pattern. I have a class that extends a view that I create multiple instances of. These appear on the screen all at once.

I need to be able to click on them individually and have each one turn green individually, however only one on touch listener is listening at once and it belongs to the last dot which appeared, so if I click anywhere on the screen the last appeared dot turns green no matter where I click.

Here is the code for my dot class:


In the code I called newdotdraw multiple times.

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Android :: Implementing Predictions For IME?

May 14, 2010

Kindly share information regarding how to implement predictions for input methods... I have a new keyboard layout for which I need to provide prediction/sugeestion functionality....

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Android :: Implementing A Framework ?

Nov 16, 2010

I have 2 apps which should both contain some similar activities.... Now I decided to write a new app, some kind of "framework", which contains these activities, to avoid to write the code twice. How can I use these activities in my other 2 apps ? Whats the common approach for doing this? Adding the "Framework app" to the build path of the two other apps won't work.....

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Android :: Implementing Gesture Recognition In An App

Jul 26, 2010

I am adding gesture recognition to my app. I have added the view as described in the Android Developers Gestures article but when it comes to adding:


where do I put this in my code, do I have to create a new class for it, or can I have it in an inner class, or does it not need a class at all?! I have a set up similar to Lunar Lander which comprises of two files, one of which is a thread that handles pretty much all the physics and drawing of the game. The other file begins the thread and saveInstanceState method. Furthermore, what type is mLibrary?! I cannot find out anywhere! I imagine I will put the OnGesturePerformed method in my thread as this is where I handle all keyUp and Down events.

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Android :: Best Approach To Implementing Polling

Jul 12, 2010

I am required to work on an application which is be deployed on devices running Android 1.5. The application is supposed to maintain a connection with a server and regularly poll it for new data. The server will notify the client of new data following which the client will connect to the server and download the data.I know that ideally a push based approach will be more conducive here given that we are to run this on a mobile platform. Also, from Android2.2 there is going to be support for C2DM(Cloud to Cloud device Messaging) but as already mentioned this application is for devices running Android1.5.Implementation: I was thinking of using AlarmManager which would Broadcast Intents periodically(poll interval), The Broadcast receiver will then try to connect to the remote server and make data changed check. If the server has an update, the thread will connect to the remote server and download the data from the server.

Problem and Issues: 1. Is this the right way to approach the problem? 2. Is AlarmManager reliable? Would it remember Alarms after a device boot? (I think it does) 3. How do I ensure that battery usage is kept at minimum.(I have heard something about using "keep-alive" to sustain the session for longer time..what is this legend?) 4. What are other things that I need to consider? I am sure I must be missing lots of things here.

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Android :: Designing And Implementing App Idea

Jun 27, 2010

Does anyone have any good references for designing and implementing an idea I have for an android application. My idea is for an application that stores information and reviews about a specific location and presents this information to user.I have gone through all the tutorials and have been reading up on anything and everything about android. Now I am ready to challenge myself with my first app.

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Android :: Can't Find Certain Implementing Classes

Mar 19, 2010

I am looking for the implementation of the IAlarmManager.I am interested in the scheduling done by the AlarmManager.setInexactRepeating method and so I started looking for the implementation but I haven't been able to find anything.Internally to AlarmManager, I can see that the actual work is being done by an interface.After googling around for a bit there seems to reference to an implementing class called but that is as far I get.I am working with Android 1.6.

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Android :: Implementing Customized Drawable

Jun 3, 2010

I was trying to get hold of 2D graphics in Android.As a example i want to implement a custom drawable and show it in my Activity But when i run the app i see no rectangle on the activity, can anyone help me out? Where am i going wrong?

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Android :: Implementing Application With Database

Aug 4, 2010

I need to know how to create simple android application by sqlite database, how can i view the sqlite database and to view the tables has like other mysql server,Let me help to create simple application with database.where i can find the database.

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Android :: Implementing VoIP Program

Nov 14, 2010

I have some design questions that I want to discuss with people interested in helping me. I am planning to develop a simple VoIP program that allows two Android phones in the same network to use VoIP. My goal is simply to capture sound, send the data with UDP, receive UDP data and play sound.My current design is to have 2 threads: one captures the microphone and sends the data; the other one receives bytes and plays them.I was starting to implement that using MediaPlayer and MediaRecorder. The issue that came up is how do I record and play sound? By that, I would like to know if I need to use a file, although that seems slow, or if there is anyway to have the recording automatically sent to my UDP socket please?Basically, I wonder if I have to record to a file, then to be able to play it, or if I could just pass a socket (for recording and playing).

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Android :: Best Practice For Implementing Watchdog

Sep 17, 2009

I'm writing an application where real-time knowledge of the GPS state is critical to convey to the user. I request GPS updates at 1000 ms intervals -- when I haven't received another update 1500 ms past the most recent update, I want to display a yellow icon, and 5000 ms after the most recent update I want to display a red icon. Currently, I'm doing it like this: private CountDownTimer gpstimeout; public void onLocationChanged(Location location) { if (gpstimeout != null) gpstimeout.cancel(); gpstimeout = new CountDownTimer(5000, 1500) { public void onTick(long m) { setYellow(); } public void onFinish() { setRed(); } }; gpstimeout.start(); }

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Android :: Error On Implementing OnClickListener ?

Mar 30, 2010

I am writing an application which one of the activity has a button and use this button to switch to another activity when clicking that.

The main activity implements the onCreate and OnClickListener as follows:


When I try to run this program on my emulator, after hitting the button, the program stopped unexpectedly. I follow the instructions of implementing OnClickListener firmly so I don't know what's the problem in my implementation.

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Android :: Implementing A Touchable Calendar

Jan 12, 2010

I am creating a small calendar control that will be part of an application that runs on a larger-than-phone-sized screen. The calendar will simply display the current month and allow users to touch-select a day with an iPhone keyboard style popup bubble indicating which day is chosen.

The problem is that in order to do it with buttons would require 42 tiny buttons, which would probably be a resource hogging solution. Although a keyboard would give me the iPhone-keyboard-bubble-like behavior, i dont think that we can place a keyboard in a static location within a Layout, using it like a View.

So I am wondering what is the best way to go about implementing this. Is my "42 buttons is too many" assumption correct? Is my keyboard assumption correct? Do I have to use a SurfaceView (or something) and draw everything myself? Is there some other grid-like control that can make this simpler?

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Android :: Implementing Seek Bar For Playing Videos

Oct 1, 2010

I am using seek bar to show the progress of the video which I am playing. I am using Media Player / Video View. But when I move the thumb of the seek bar back and forth, the video is not starting correspondingly from the position of the thumb. Anybody has any idea of how to load the video from where the seekbar's thumb is positioned?

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Android :: Implementing Push Technology Into Apps

Oct 16, 2009

What are the different ways to implement push technology into your Android app? The client Android app is supposed to receive content (XML Data) pushed by the server. I've looked around and found out it was possible to achieve it with usage off the SOAP protocol. But are there some better ways top implement push? The main concern in this project is the phones battery life, all off it has to happpen over WiFi, pushed content has to be viewable on the device immediately.

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Android :: What Is Operational Process Of Implementing L10n?

Jul 20, 2009

How to implement Android system l10n ´╝čIt has been l10n in German.What is different between Android and Linux in realizing system localization What is Operational process of implementing Android l10n ? What is needed to implement Android system localization? such as Unicode UTF8, charset,other anything else?

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Android :: Getting Started Designing And Implementing An Idea For App

Jun 27, 2010

Does anyone have any good references for designing and implementing an idea I have for an android application.

My idea is for an application that stores information and reviews about a specific location and presents this information to user.

I have gone through all the tutorials and have been reading up on anything and everything about android. Now I am ready to challenge myself with my first app.

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Android :: Way To Implementing Flood Fill Algorithm On Bitmap?

Jul 22, 2009

Can some one help me out with implementing flood fill algorithm on the bitmpap. I have tried various algorithms but either they seem to be too slow or i get a stack over flow exception.

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Android :: Store Second Value Beside Each String Without Implementing New Adapter Class?

Oct 14, 2010

I want to create a ArrayAdapter for one spinner. So each element contain one string (which will be displayed in the spinner/list) and one value (e.g. an ID). How I can easily store a second value beside each string without implementing a new Adapter class?

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Android : Implementing Custom Way To Lock/unlock Phone

Sep 9, 2010

Is it possible to implement a custom way to lock/unlock an android mobile phone?I know that in versions 2.1 from android and before, there was only the locking pattern available, and that in version 2.2 it is now possible to set a password as well, but what if i want to make a custom way of locking/unlocking it myself (such as recognizing handwriting, or making some different alternative method for the locking and unlocking process)?Is it possible to achieve this through an application? or would it be necessary to make a version of the Android OS based in the same source code but with changes within it?If it would be necessary to make a different custom version of Android, can anyone give me any hints or tips as to how and where in the source code files are the blocking options considered?

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Android :: Implementing Multi Select (check Boxes) ListPreference

Aug 29, 2010

on implementing a multi-select (check boxes) ListPreference on Android? Would I have to extend the ListPreference? Is there any classes already documented to do this?

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Android :: Service Path To Choose For Implementing Large Upload?

Jul 17, 2010

I am trying to implement a RESTful API in which I have to upload files that are relatively large for a mobile platform. The upload could take anywhere from 30 seconds to 5 minutes.I would like my application to be completely usable while the upload takes place. I've been doing some research and I've come across a few methods from which I can't decide which is the correct solution to my problem.Using an IntentService -- handles the worker thread so I don't have to. Using my own type of Service-- still need to implement an AsyncTask to handle the large process. Implement an AsyncTask in a singleton file that would allow me to do all the work there but without using the service class. My question is which method is the best -- if one isn't listed but is a more apt solution to my problem then I would appreciate suggestions.After researching all these methods I am still also confused on one thing. Lets say I upload a 2MB files, but I want to know when it is done. For example, lets say I have a service that uploads an image and returns and imageID -- I need to be able to know when that service returns an imageID -- process that and then move on to the next upload until the rest are finished.

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Android :: Native Way Of Implementing Publish Subscribe Between Droid Widgets

Jul 16, 2009

I have a custom EditText and a TextView in an Activity. The custom EditText traps for key presses and calculates the number of character entered and wants to publish the character count to the TextView. Do I use the java.util.Observable/Observer way ? Or is there a more native android method to achieve this?

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Android :: Security Exception While Implementing Global Search For Messaging

Apr 16, 2010

I am trying to enable global search for messaging application (i.e., messages can be searched from home screen search box). I have followed all the steps given in

I am getting the following exception


I have set permission in file for read, write sms and global search, but still I get this error.

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Android :: Implementing A Robust Persistent Undo/redo Feature

Oct 27, 2010

I'm writing a bitmap editor where I use the Command Pattern to represent actions that will transform the document. I keep all the commands executed so far in a list and, to implement undo, I restore the document to its initial state and then replay all but the last command.

I would like my undo/redo system to have the following feature: When the user closes the editor and returns, the document, including the available undo and redo commands, should be restored to the state it was in when the user left.

I'm implementing this for Android where your application can be given very little notice before it will be cleared from memory if e.g. the user gets a phone call. Also, some of my commands are e.g. a list of all the x,y co-ord the user painted on so these might take a few moments to save to disk.

My current idea is as follows:

When a new action is performed, the command object is added to a list S for commands that need to be saved to disk.

A background thread is used that will continually take commands from list S and save them to disk. The postfix of the filenames used will be numbered in sequence. For example, if the user filled the screen then drew 2 circles, the command files might be called FillCommand1.cmd, DrawCircleCommand2.cmd, DrawCircleCommand3.cmd.

Periodically, we save a "checkpoint" command whose purpose is to store the full document state so that, even if one of the .cmd files is corrupted, we can restore a recent version of the document.
When the user exits the app, the background thread attempts to finish up saving all the commands it can (but it might get killed).

On startup, we look for the most recent .cmd file that represents a checkpoint that we can load successfully. All the .cmd files we can load after this (i.e. some files might be corrupt) go in the redo command list, all the .cmd files we can load between the first checkpoint loaded and the oldest checkpoint we can load go in the undo list.

I want the undo limit to be about 20 or 30 commands back so I need extra logic for discarding commands, deleting .cmd files and I've got to worry about multi-threading behaviour. This system seems pretty complex and will need a lot of testing to make sure it doesn't go wrong.

Is there anything in Java or Android than can help make this easier? Am I reinventing the wheel anywhere? Maybe a database would be better?

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Android :: Implementing Ability To Scroll When Needed To Phones That Might Be Too Small

Nov 24, 2010

I have tested my app in a debugger for many different sizes, and realized I will probably need a scrollView to allow the user to view the full layout.

The issue, is I use a flipper in my main.xml with multiple linear layouts like so:


I made the ImageViews, Buttons, TextViews, etc comments so not to bloat the code -

This is in my main xml file, where all the layouts are displayed. How can I go about easily adding a scroll view to each layout, so if it is too big for the screen of a certain phone, the user can scroll through the page to see all the content?

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Android :: Implementing A Timer Thats Active All The Time - Even During Screen Timeout

Oct 31, 2010

I've implemented a Service in my android app that starts a timer (using the standard java.util.Timer and java.util.TimerTask mechanism) to do some processing in the background on a pre-defined interval.


The service is started / stopped by my application like this.


As long as the phone is active (no screen-timeout occured), the service is running fine, and the Timer is performing its job at the defined interval. Even when I quit the application (using the back button), the timer remains active.

However, as soon as the phone goes into timeout, the timer task is no longer running stable. If I leave the phone in timeout for several hours (at night), I would see that on random occasions (sometimes a several hours interval) the timer kicked in.

Also, when the phone is activated again, all timer runs that have been queued are suddenly executed in one shot before resuming back to the normal interval.

What would be the right way of implementing a timer that continues to run properly, even after the phone has gone into timeout. Should I resort to using the PowerManager and WAKE_LOCKS (as described here, or is there another mechanism ?

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