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:
CODE:.................
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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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 com.android.utli.(ClassName)" here the "com.android.util" 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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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 TimerTask.run() 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:
http://groups.google.com/group/android-developers/browse_thread/threa...
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Jan 22, 2010
I want to create a java.util.map in android from a resource. I want to do this because I have a lot of entries to populate into the java.util.map 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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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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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: http://74.118.194.50:84/Balls.apk
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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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.
CODE:...............
Here is my CODE:.........................
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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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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):
CODE:.................
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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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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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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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 Logger.java 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.
code:....................
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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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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?
CODE:.......................
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Sep 27, 2010
When I run the following line of code:
MediaScannerConnection scanner = new MediaScannerConnection( this, null );
scanner.connect();
scanner.scanFile( szFinalFileName, null ); //<---crash here
I get a crash and this message in the console window:
09-26 14:47:44.074: ERROR/MediaScannerService(10288): Failed to delete file /data/data/com.android.providers.media/pause_scan
does anyone have any ideas why this isnt working and what i can do to fix it?
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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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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*: http://developer.android.com/reference/android/util/SparseArray.html
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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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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Aug 26, 2010
I got my x on launch day no root no 2.2 all stock .well i've been noticing its getting slower don't have much installed only about 10 apps. The browser will start and then stop when u tell it to go somewere then after a dew sec it takes back off. Text message when u bring it up it takes about 10 sec to load then another lag to start typing and there wont be any old messages in box and when they do finally come up u can't scroll threw the old ones.
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May 19, 2010
i have two files
App.java
Gallery.java
App. java contains frontend buttons and functionalities Gallery.java lists the imagesin the sd card. i want to call Gallery.java in click event in app.java
App.java
package gallery.display;
import android.app.Activity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;...........
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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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Aug 16, 2010
I have Jot Not for iPhone which does a great job of scanning documents, white boards, etc. and putting them into a multiple page PDF.
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Dec 14, 2009
if theres an app for this or anything in the works? My and i usually like to go mess around with some other dub owners around the island and he keeps the police scanner app out. its saved our butts a few times and would be awesome to have on my droid.
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Jun 29, 2010
Is there a bar code scanner app that will really list stores that carry the item, price etc? i have tried 4 so far, non will. they search web sites. a friend who has an iphone says hers will do it, but didn't offer to demonstrate.
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Apr 9, 2012
I would like to program or build a QR scanner for Android. However, I know nothing about programming so I would need a step by step instruction.
I have sucessfully used MIT App Inventor to make a QR scanner, however I want to add features. As far as I can see, I cannot output sourcecode in App Inventor, so I'm unable to edit the parts I want to.
Basically I want to change the filters and colours of an image before it gets sent to a QR reader. The QR reader could use live capture from a camera or just stills. I only need a proof of concept, so it does not need much else.
I'd probably get as far as installing Eclipse, and starting a project. But so far I have no idea what to do with source code, or how to add the feature I require.
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Aug 8, 2009
Java packages like Java.io, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?
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Jan 12, 2010
DL 2 different scanners, barcode scanner and shopsavvy. Neither one works worth a darned. Have tried different items usually common ones i.e. a case of Mtn. Dew. It chokes and says it can't find a retailer. Seriously?! If it can't find even a simple case of pop which hundreds of retailers have, that's pathetic!! Has anyone found a real BC app that has actual products and works?
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May 19, 2010
My wife and I have droids, however new to droid and she was using calorie counter to do her grocery shopping as it had a scanner function that would tell her how many points the item is while shopping. Calorie counter removed that function and my wife is looking for a replacement. I apologize if i duplicated a prior post.
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May 5, 2010
I'm a Legend user. I've downloaded brightbuyr/shopsavvy and each time, it says that the application needs Barcode Scanner. It then can't find it on the Market at all! Does anyone know where I can get Barcode Scanner from? Eek!
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Nov 17, 2009
I am writing an application that needs the ability to scan barcodes. I know that the ZXING Library can be used for this but I can't find a resource only that has a tutorial on how to use this library in your app. I want to be able to install my app and if the ZXING library isn't installed maybe install it too?
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