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?

Android :: Util Class in Java

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 :: 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 :: 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 :: 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 :: 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 :: 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 :: Call Activity Class From Other Java Class?

Oct 8, 2010

I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.

public class GsonParser extends Activity {
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
MagazineThread thread=new MagazineThread();
public GsonParser(JsonMagazineParser Obj)


and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity can i achieve that.

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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 :: In Java, What Does A Reference To Class.class Do?

Jul 20, 2010

I'm building a small Android application, but this is more of a Java question than an android question. Looking through the tutorials there are lines that look like: startService(new Intent(this, MyService.class));

What exactly does the "MyService.class" field represent? Is that just a reference to the class for a template?

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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 :: 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 :: 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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Android :: Can Run Java Class Files

Jul 9, 2009

There are a lot of language which compiles into Java class files when can run on JVM (e.g. JRuby, Scala, Rhino). Can you please tell me if I can take those class files (compiles by the JRuby/Scala/Rhion compiler) and run it on Android platform?

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Android :: Java URL Class Can't Use HTTPS In App / Way To Do

Jan 11, 2010

I want to use HTTPS in my application. The Java URL class does not seem to do the job.

Does anyone have any pointers?

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Android :: How To Get Different Package Name For Generated R.Java Class?

Jan 24, 2009

Apt while generating the resources, is it possible to provide a different package name for the generated class. Currently it seems to use the same package name as the one in manfifest defination of AndroidManifest.xml <manifest xmlns:android=""package=""> Also, is there a way to give custom class name instead of default R name say Resources.

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Android :: How Do Import A Java Point Class

Sep 17, 2009

I am writing an android game. I need a Point class that stores x and y coordinates. I have found a class called java.awt.Point. Which looks like what I need. I have created an interface for java.awt.Point and put import java.awt.Point in my code. But when I do Point pos = new Point.

I get an error: cannot instantiate Point. Also if I do pos. I don't get x or y member variables. I could code my own Point class but I need to learn how to import stuff.

If I delete the interface for Point I get an error on import java.awt.Point. It says the import cannot be resolved.

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Android :: Class Java.awt.Font Error

Feb 25, 2010

When I try to edit project/res/main.xml using android layout editor in eclipse I get the error "Could not initialize class java.awt.font".

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Android :: Dex To Convert To Java Class Format

Aug 16, 2010

Is there any tool available to convert android dex file format to java class format? I've looked at dex2jar, but it looked very early in development. I'd like something that is stable enought for use.

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Android :: Possible To Put Each Class Into It's Own Java File In Eclispe?

Apr 20, 2010

I'm coming over from C# where I can make a namespace and then have each class placed into its own .cs file if I want, but in all of the examples I've seen for android all of the methods and classes are all in one big java file.

Is it possible to put my classes in to their own java files and then import those classes into a main program java file as needed like I do in C#?

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Android :: Call A Value Entered In A UI To Your Java Class?

Jan 23, 2010

Making a simple app for my android.

in my xml interface there is a text box in which the user will input a number (for example: 10). the id of this text box is "input1"

how do I call the value of input1 in Java and then perform a calculation on it?

For example...

suppose input1 = x

x + 5 or x*2

and for that matter, how do I have the resulting value appear as constantly updated text output in a specified place on the UI?

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Android :: Error - Unable To Fnd Class No Such File Or Dir

Oct 18, 2010

I keep getting this when trying to start a new project

ERROR: Unable to open class file No such file or directory

I tried changing preferences to alter build path to project, but it still wouldnt work,,,

Is subfolder on desktop a bad place to install Eclipse?

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