Android :: Simple Converting Java.util.Calendar To Time

Nov 12, 2010

I'm creating a android.text.format.Time Object from a java.util.Calendar Instance, and I read it out field by field.

Android :: Simple converting java.util.Calendar to Time

Android :: Java.util.Calendar - Time Difference

Jul 29, 2009

I want to make calendar view in order to support touch interaction. So I'd like to build new custom calendar view. I tried to make mapping function between view offset and real date value.

Here is my idea:
If I can compute the number of weeks since base date(in my case, 1989-12-31), it is easy to know offset. HEIGHT_FOR_WEEK * NUM_OF_WEEK is very simple computation to know exact offset.

My problem is this:
First I got milliseconds value from base date. And I set the milliseconds to another calendar object. I expected same date from that object. But actually it was different date.


Here is my CODE:.........................

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Android :: Java.util.Date Vs Text.format.Time

Oct 26, 2010

Which one should I use java.util.Date or android.text.format.Time? It seems you can accomplish what one needs to do with either. What I need to do is at times get the current date and time and sometimes set a date and time specified by the user.

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Android :: Util Class In Java

Sep 3, 2010

I want to know about the util Class used in Java. I am currently working on one Application in Android where I need to used a class from one file to another different file. I was told to import it like "import" here the "" is a package name.

Can I use thast class in my another file simply by importing the package along with the Class Name?

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Android :: Java.util.TimerTask

Jan 15, 2010

Can I rely on Timer and TimerTask to work properly on Android?

I have a background Service with a single Timer, and I schedule (possibly multiple) TimerTask's via Timer.schedule()

At the beginning of each implemented method, I check the TimerTask.scheduledExecutionTime() and compare it with the current time. Sometimes things are fine, and the difference is a small number of ms. But sometimes things are nowhere near fine, and the invocation of my TimerTask is *way* late -- like multiple hours late.

Can an Android phone go into some deep sleep mode when it doesn't think anything is going on that would cause a TimerTask to be so late? Can I not reliably use TimerTask for scheduling events, and should I be using some Android-specific means (e.g. the AlarmManager, or a Handler) instead?

I have not found anything that says that java.util.TimerTask shouldn't be sufficient, the Android docs include no kinds of qualifiers, and this post (from Mark Murphy, who's written several good Android books) specifically mentions it as being available:

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Android :: Creating Java.util.Map

Jan 22, 2010

I want to create a in android from a resource. I want to do this because I have a lot of entries to populate into the and I want to store the values in the res folder of the project in xml format.

Is there an effecient way to do this in android? My map will have around 2500 entries so I want to do this as effeciently as possible and I don't want to hard code them...

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Android :: Java.util.concurrent.ConcurrentLinkedQueue

Apr 14, 2010

I want to use ConcurrentLinkedQueue in an android application, have written the code, but now I'm getting an error when the project builds:

Conversion to Dalvik format failed with error 2

I'm using Eclipse with the lastest version of the ADT plugin.

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Android :: Java.util.Random Caching

Apr 19, 2010

That is the only thing I can think of. When I generate a random number (for the radius of a ball), after a while, the radius goes to one number and sticks that way. I've even tried setting the random number value to 0 before getting the random number, and java.util.Random must be at fault, it still gives the same random number. Here is an apk if you would like to try it yourself:

Here is a snippet of the code (I would rather not release the full source): <code> Random randomizer = new Random(System.currentTimeMillis()); int hw; hw = randomizer.nextInt(95-15+1)+15; </code>

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Android :: Is Java.util.Scanner That Slow

Mar 15, 2010

In a Android application I want to use Scanner class to read a list of floats from a text file (it's a list of vertex coordinates for OpenGL). Exact code is:


It seems however that this is incredibly slow (it took 30 minutes to read 10,000 floats!) - as tested on the 2.1 emulator. What's going on?

I don't remember Scanner to be that slow when I used it on the PC (truth be told I never read more than 100 values before). Or is it something else, like reading from an asset input stream?

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Android :: Weird Behavior Of Java.util.Preferences

Sep 25, 2009

My app needs to save its state before being killed, and since that state is really small (one Long), I've decided to use java.util.Preferences. I use it like the way I would be using in any Java application (and never had problems), though I am not sure this is the correct way here on Android platform: private static final Preferences prefs = Preferences.userNodeForPackage (WordChoice.class);

I update preferences in onPause() method, to ensure that data is always persisted no matter how my app ends: Here is that fragment of code: protected void onPause() { super.onPause(); prefs.putLong("currIndex", somePositiveValue); }

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Android :: AsyncTask : Java.util.concurrent.RejectedExecutionException

Apr 7, 2010

I'm trying to launch a lot of remote connection retrieve picture on a server. To do this, I use AsyncTask.

This pics are displayed in a listview using adapter.

If I implement this in my adapter, images are retrieved but the display is bad (problem with index or something like that).

If I try to retrieve image when I build my object list (contained in my listview), I get the exception 04-07 13:35:57.744: ERROR/AndroidRuntime(4132):


What is this exception ? Why I can launch multiple asynctask in my listview (giving to me a bad result) and not in a simple object without having this issue ?

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Android :: Util.SparseArray Space Time Complexity Properties

May 19, 2009

I need a map from int to certain objects. I wanted to use the HashMap, but in the documentation of SparseArray it says that SparseArray is intented to be *more efficient*:

However i think the documentation is not entirely correct and needs more info: When reviewing the sourcecode of SparseArray and comparing it with the HashMap i come to the following conclusion

Source code of Sparse Array: [url]

For SpareArray: Time complexity for reads and writes on a map of size N is log2(N) + 1,

However the time complexity for a HashMap of size N is C*N (where C is a constant) (according to the javadoc [url]

So maybe SparseArray is more efficient with respect to space complexity it is not for time complexity. So for programs that need high performance a HashMap may be better.

At least thats what i think. Am i right? Am i wrong? I need a very fast implementation for my game.

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Android :: Class Initialization Issues Loading Java.util.logging.LogManager In Dalvik VM

Mar 18, 2010

I've done changes in an Android native library and installed a new system.img file but am now getting an unrelated Error on startup. I can get past it by swallowing the error but I wanted to know if anyone can explain what the issue is.

The Android implementation of claims that it is Forcing the LogManager to be initialized since its class init code performs necessary one-time setup. But this forced initialization results in a NoClassDefFoundError. I'm thinking that it has something to do with the class not having been preloaded by Zygote yet but am not that familiar with the whole class loaders and VM business.


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Android :: Error: Java.lang.IllegalArgumentExcep­tion: Already Added - Lnet/ponder2/Util

Oct 27, 2009

I am using the Eclipse plugin and I have the above error. I know why it is occurring, it is because I want to override a class file in one of my imported jar files. I am including a new Util class before the jar file in question. I have tried it both as a simple .class file in my package hierarchy and I have tried putting it into another jar file and including it before the one to be overridden.

I would like it to behave like the Java classpath and use the first one it comes to when running through all the classes. I don't mind if dex wants to give me a warning that it is not using the second Util.class file but it should let me build my application. To build my app, I have to create a special jar file without the old Util.class in it. This is annoying as I would like to use the bog standard version so that others can use it with ease too.

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Android :: Converting Java Code

Oct 10, 2010

I Have a Java application and I need to convert it to an Android application is there any resources to show how ? in Android developer site I didnt found anything like that! I need to use the Java methods and classes in android ,How it can be done?

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Android :: Converting Dex File To Java Back

Aug 13, 2010

I need to decompile a .dex file back into java to edit it and recompile it back into .dex. I then need to put all the files back into the .apk format. How would I do this?

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Android :: Using Java.util.regex In Android Apps

Apr 2, 2010

In an Android app I have a utility class that I use to parse strings for 2 regEx's. I compile the 2 patterns in a static initializer so they only get compiled once, then activities can use the parsing methods statically.

This works fine except that the first time the class is accessed and loaded, and the static initializer compiles the pattern, the UI hangs for close to a MINUTE while it compiles the pattern! After the first time, it flies on all subsequent calls to parseString().

My regEx that I am using is rather large - 847 characters, but in a normal java webapp this is lightning fast. I am testing this so far only in the emulator with a 1.5 AVD.

Could this just be an emulator issue or is there some other reason that this pattern is taking so long to compile?


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Android :: Converting System - CurrentTimeMillis() Into The Current - Readable Time

Nov 15, 2010

is there a way to use the System.currentTimeMillis(); to have convery that number into a basic output HH:MM in droid? I am using the sample code:


That outputs the current time in MS since the epoch. There has got to be a better way to do this rather than convert that large number and display the current time right?

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Android :: Simple Shape Recognition Libraries For Java

Mar 16, 2010

I am working on a on-screen keyboard for Android, and I need to recognize starting points, turning points and end points of lines drawn by the user on the keyboard. A simple straightening function would be nice, as it is difficult to draw a perfectly straight line even with a stylus, not to mention finger-only touchscreens today.What I am trying to write is something like Swype. Any good libraries that I can use or make reference to?

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Android :: Converting Android Project To Regular Java Inside Eclipse?

Apr 2, 2010

Ive inherited some code which started out as an Android project but really is just an API to be used by other applications. Hence, the 'build' process usually just produces a JAR file. The problem I am having is that I get errors from the Android build tools in my console which seem to fire everytime I make a change to some files.

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Android :: Develop Using Libraries In Simple Java Project - Without Using Dalvik And Such

Oct 9, 2010

As I am very pissed off of using the emulator to develop any Java class, I thought of setting up a project in Eclipse and instead of the usual JRE I linked to the Android.jar (version 2.1) that usually the Android projects link to. I don't mean to use this to develop Layouts or other specific platform things, I was just trying to create a class that uses HttpClient.

It miserably crashes like this.


I mean I'd like to develop libraries (and test them) so that when I go to the emulator I don't have to deal with them. Is there a good way to do this? This seems not to work for some reason.

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Android :: Simple Adapter - Text - Image In Spinner - Java

Sep 10, 2010

I've got a little problem...Well, let me first state what I'm trying to accomplish. I had a spinner that pulls strings out of a stored array.

Like so, you dont need to read it though:


So far I've got a custom SimpleAdapter.

Here is the Problem!! : the text comes up but not the image. Heres the code:


I plan to use a switch statement to set different images to each name. however i stopped here until i can get any image to show. How i'm calling


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Android :: Use HTTP Post Method Or Simple Java Socket Program

Mar 20, 2010

Could someone please suggest me a good/efficient way to communicate with the server. I could think of two options 1) Use http post methods to send data to a php script at the server which would later call the google api's written in another java program (jar)or use php to use google api's (if its possible) to find nearby restaurants and send the list back to client. 2) Use simple java socket programming. The server has a jar file that supports multi threading and it does the job of finding restaurants and sending the list.

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Android :: How To Get Simple Date / Time In Phone?

Jun 2, 2010

How can I easily get date and time as integer values in Android?

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Android :: Display A Dialog In Non-Activity - Simple Java - Class By Passing Parameters

Jun 23, 2010

I am trying to display a dialog box in a simple Java class that is called from my main Activity but not successful. Please help me to figure it out.

I am passing the required values as parametrs.

I have two class: class MainActivity extends Activity :: Main *starting point *of Application class ShowMyDialog :: a simple java program In which I *generate an URl* and *display a dialog with WebView*.

I am passing the Acitivity from my MainActivity to this class as a parameter in function.

But I am *unable to call* the onCreateDialog method that I have *defined in the simple java class.

However, If I define the *onCreateDialog method in MainActivity, I am able to display it successfully.

What Should I pass as Parameter to the non Activity class from MainActivity class so that I am able to display the dialog as defined by showdialog method in JAVA class ???*

My steps of source code is as follow:


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Android :: Simple Calendar Widget Wont Update?

Nov 5, 2010

this works fine on my Droid X but on my wifes ALLY i cant get it to show new calendar entries for some reason? i hit refresh in top left corner after adding new event but it wont show up?

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Best Way To Develop Simple Time Card App?

Mar 2, 2013

I'd like to develop a simple timecard app for Android, specifically targeted like the apps below.

Wrap Time - Time Card for Film Crews iPhone App Download on Appato
Crew Time Card - iPhone App

These only exist for Apple products, though. What is the easiest, most straight-forward (Windows-based) software for creating such an app? I've heard of something called Eclipse...? Or there's something from Google?

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General :: Simple App To Set Date And Time?

Feb 25, 2014

Simple app, for rooted, to set the date and time? Something similar to the the option you normally find in the Settings.

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Android :: Converting XML Into Java In Android

Aug 11, 2010

In my new project I retrieve an XML file from a server. I want to convert this into Java objects.Now, clearly searching on this brings up a lot of solutions and topics, but some of them don't seem to be fully Android compatible. Also, some are over complex, with automatic class creation from annotations. I prefer to write my own classes in this case.What technology would you recommend I look at to achieve this in Android?

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Android :: Android (Java) Simple Send And Receive With Server

Jun 11, 2009

I'm writing an Android App and I'm looking for the fastest (In terms of setup) way for me to send data to a server and receive information back on request. We're talking basic stuff. I have a log file which tells me how a user is using my application (In beta, I wouldn't runin a user experience by constantly logging usually) and I want to communicate that to my server (That I haven't setup).

I don't need security, I don't need high throughput or concurrent connections (I have 3 phones to play with) but I do need to set it up fast! I remember back in the day that setting up XAMPP was particularly brainless, then maybe I could use PHP to send the file from the phone to the Server? The Server would ideally be able to respond to a GET which would allow me to send back some SQL statements which ultimately affect the UI. (It's meant to adapt the presented options depending on those most commonly used).

So there you have it, I used PHP about 4 years ago and will go down that route if it's the best but if there's some kind of new fangled port open closing binary streaming singing and dancing method that has superseeded that option I would love to know. This tutorial seems useful but I don't really need object serialization, just text files back and forth, compressed naturally. Android comes with the Apache HTTP Client 4.0 built in as well as and, I'd rather not add too much bult to my App with third party libraries.

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