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...

Android :: Creating java.util.Map

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 :: 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 :: 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 :: 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 :: 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 :: 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.

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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 :: 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 :: Creating New Projects In Eclipse - Java File Not Generated

Jun 14, 2009

When I make a new project the .java file is not generated. I can run the project, but it does not run in the emulator or anything. It did use to work before then it stop working. I tried deleting the folder and all project files. After that I reinstalled everything but I am still having problems.

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Android :: Creating Android Apps Without Java

Sep 10, 2010

I'd like to start creating Android apps but I don't like Java. I read that scala can be used to do it. Are there another option?(Clojure?) I'm a Python/Django developer so it would be great to learn a pretty different language.

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Android :: Creating A New Class Using Eclipse New Java Class Dialog Box

Jul 7, 2010

I'm creating a new class, using eclipse "New Java Class" dialog box. I can write the superclass I want (I can't find using "browse" button), but I can't write or select an interface to implement. I click "add" but ther is nothing to select. What I'm doing wrong?

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Android :: Cannot Import Droid.text.util.Regex / Where Is It?

Aug 10, 2010

I'm developing an application and I want to use android.text.util.Regex.WEB_URL_PATTERN as the pattern for the Linkify. But, as I have notice, I cannot import android.text.util.Regex for some reason.

Why so? Is there a way to workaround this?

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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 : Write A Wifi Cracking Util For Phones / Monitor Mode Vs Multicast?

Jun 23, 2010

Considering writing a wifi cracking (wep, wpa) auditing tool for the android platform, but I am wondering if it is possible to do without a rooted phone.

I had thought it would be impossible to run on an unrooted phone due to the phones wifi chip ignoring packets not addressed to the phone. That is, without the ability to set the wifi chip to monitor mode many of these attacks wont work. I was surprised to learn that android supports multicast packets. That is, android phones can be set to receive packets not addressed to them.

My questions are: Does having a multicast lock mean I can receive all packets broadcast, or does it only apply to packets with a multicast flag (if such a thing exists)?

Is there a difference between monitor mode and multicast? Does the android api have a system for switching channels?

More generally I'm curious: Is anyone familar with other wifi cracking projects running on android (google searches turned up very little)?

What difficulties am I likely to run into?

This question is related to SO question Is there anyway to put Android WIFI (droid handset) into permiscuous monitoring mode?

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Android :: Call Java File On Click In Another Java Class?

May 19, 2010

i have two files

App. java contains frontend buttons and functionalities lists the imagesin the sd card. i want to call in click event in
package gallery.display;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;...........

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Android : Can Not Call A Java Method Using Add Java Script Interface()

Mar 16, 2009

I'm trying to call a java method from javascript using addJavascriptInterface(); but seems does not work, it always display "failure"; java code...

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Android :: / Java.Lang Different From Packages In Windows?

Aug 8, 2009

Java packages like, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?

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Android :: Java Compatibility With GetFields Method In Android Java.lang.Class

Feb 11, 2009

I'm having some problems porting a Java application to work in Android platform. I detected an incompatibility problem between java sun and Adroid sdk in java.lang.Class. I oberved that: public Field[] getFields() Returns an array containing Field objects describing all fields which are defined. That's array is sorted as attributes are declared in the main Class in sun jdk. For example, next Class is defined as: public class Example { public boolean stop; public int atr1; public String name; ....

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Android :: Android / Java - Call Function In Separate *.java File?

Aug 16, 2010

I do an import of the full package name / java file, and if I do a <classname>.<method>, SOMETIMES I can get it to access - other times I get a lot of can't use a static in a non static bunch of talk. I'll admit I'm new to Java, so what do I need to do? Call a class instance first, then call my methods? I'm rather confused by this, as I want to put all of my 'functions' into a file, and all of my main Activity (UI) into a file.

For example:
import com.example.FunctionsList;
private class MyActivity extends Activity {

9/10 times I get that static/non-static error. If I put all of my functions into, I have zero problems!

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Android :: Call Java Methods From One Java Class To Another In Android?

Nov 3, 2010

i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..

import android.os.Bundle;
import android.widget.;
import android.view.;
import android.content.Intent;...........

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Using Java 6 Instead Of Java 7 - Installing ADT Plugin?

Feb 5, 2014

I am trying to install the ADT Plugin. It is not working.

This is after Hello->Install New Software
Name: ADT Plugin

Location: https:[code]....

How do I install ADT Plugin?I am using Java 6 instead of Java 7 per recommendation of posts elsewhere. It didn't work.

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Android :: Call Java Class Methods To Other Java Class File On Android

Nov 3, 2010

i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
In 1st activity class

import; import android.os.Bundle; import android.widget.; import android.view.; import android.content.Intent;

/** * * @author pavankumar */

public class FirstActivity extends Activity {................

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Android :: And - Is ApplicationContext Not Used

Sep 29, 2009

I was going through the code for and ApplicationContext.

Both these classes define many functions of Context Interface. Take for example

Activity Class has its own implementation of startActivity ApplicationContext class also has an implemenetaion of startActivity.

Now there are 2 observations...


Questions: 1. Who uses ApplicationContext class? 2. Does Activity class ever deal with ApplicationContext class (as given in the javadoc comments of

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Android :: Creating Apk Using Ant Build For 1.5.

Aug 6, 2009

I'm seemingly having problems creating the apk using an ant build for 1.5. It's building so I'm guessing the sdk pointer in is set correctly, but it seems to not be finding* (?).

I can see that jarutils.jar is in


Here's the traceback spew...

release: [apkbuilder] Creating .Phresheez-unsigned.apk for release...


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