Android :: Utility Classes In Java Programming?
Oct 13, 2010I am new to Java and I referred regarding my question on the Net but not quite Satisfied. I want to know what the "Utility Class" in Java is?

I am new to Java and I referred regarding my question on the Net but not quite Satisfied. I want to know what the "Utility Class" in Java is?
I have a little idea of the Utility Classes with a slight doubt on demand.
If I use a Utility class in my Application than to use that class in my main Activity do I have to create the object of that class or I can directly Import that class in my main activity?
In the nutshell, all I want to be clear about is that basically how can I use the utility class in my Main Activity?
I am doing Android programing with Eclipse (Helios), and I have some utility classes created. How do I set up Eclipse, so that if I use one of my utility classes it gets included when the project compiles?
View 1 Replies View RelatedNext year there will be Android programming classes on Wroclaw University (Poland) but handsets for excersises needs to be choosen now. I was thinking about HTC Hero because:
As HTC device it is a reference model for Android ecosystem; it will run system version 2.0; it has fair features/price ratio.
Are there any arguments against Hero? Or maybe there is another handset more suitable for programming classes?
It would work something like this
someUtility.replace ("Hello, my name is {1}. What is your {2}?", "Mark", "name");
Since i'm still new on Android programming, I have some problems on some issues. I have a QuadTree data structure implementation in 3 seperated Java files and i would like to use this data structure in my application. But i don't know how to use this .java files in an Android project. I tried to put them in a new Android project, just for testing, but I get lots of errors. Could anyone help me about using this java classes in my Application?
View 3 Replies View RelatedHow can I install java classes not included with android ?
Is it possible to add java.awt.image package into android?
Where can I find above package jar file?
When calling javah on a .java file in my android project, javah was unable to find the android classes (specifically android.graphics.Bitmap).
Here's the terminal output:
CODE:..................
I have a .jar in my Android project which has many references and uses of the java.awt.* classes and other classes not available on Android. How can I provide my own implementations of these classes so that I can embed the unmodified .jar file (the only modification is being ran through dx) in my Android application and it will use my own class implementations?
View 1 Replies View RelatedI downloaded the android source code.. how to make our own jar file with all our available java classes in the Android source code....
View 5 Replies View RelatedI am developing android application but i don't know how to integrate two activity files(two java classes) with one-onether like we are doing in java?If u have solution please tell me how to do it?
View 2 Replies View RelatedI've recently knocked up a server/client app for Windows & Android that allows one to send a file from Windows to an android phone over a socket connection. It works great for a single file but trying to send multiple files over in a single stream is causing me problems. I've also realised that aside from the binary data, I will need to send messages over the socket to indicate error states and other application messages. I have little experience with network programming and and wondering what is the best way forward.Basically the C# server side of the app just goes into a listening state and uses Socket.SendFile to transmit the file. On Android I use the standard Java Socket.getInputStream() to receive the file. That works great for a single file transfer, but how should I handle multiple files and error/messaging information? Do I need to use a different socket for each file? Should I be using a higher level framework to handle this or can I send everything over the single socket? Any other suggestions for frameworks or learning materials?
View 1 Replies View RelatedI have a layout xml . I would like to do that in java programming. code...
View 3 Replies View RelatedI have been seeking beginner learning books in Android, and of course found out that I should learn Java first. So I began studying Java and now I am quite comfortable with objects, classes, inheritance, interfaces, and just moved onto Layouts in Swing as well as Swing Features. But I am starting to wonder.... do I know enough about Java now? Can I start programming Android yet?
Of course I can keep going in Java, but have been itching to begin programming Android apps.
Any definitive answer here about how much Java I need to know before Android?
i'm trying to include a maven java project into my android project. the maven project is the greader-unofficial project which allows developers access to google reader accounts, and handles all of the http transactions and URI/URL building, making grabbing feeds and items from google reader transparent to the developer. the project is available here:
the code is originally written for the standard jdk and uses classes from java.net that are not a part of the standard Android SDK. i actually tried to manually resolve all dependencies and ran into a problem when i got as far as including com.sun.syndication pieces required by the class be.lechtitseb.google.reader.api.util.AtomUtil.java... some of the classes in java.net that are in the standard jdk (i'm using 1.6) are not in the Android SDK. in addition, resolving all of these dependencies manually is just ridiculous when i'm compiling a maven project that should be pretty simple.
however, i can use maven to compile the sources with no issue. how can i include this maven project, which is dependent on the complete jdk, into my android project in such a way that it will compile so that i can access the GoogleReader class from my android project? and for the record, i don't have the expertise to rewrite this entire api to work with the standard Android SDK.
I updated the android framework ( java code), and I was able to compile the new java classes and test it. My issue is that i want to make some of the new java classes part of the android.jar, and i am unable to figure out the best way to add it to be build file.
For example: I want to include another class just like com.android,internal.util.Predicate.class is included in the android.jar. How and where do one indicate that the Predicate.class needs to be included in the android.jar?
I am new to android development and am currently working my way through the "Hello..." Tutorials on the developer website.
I got stuck on the Tab Layout walkthrough and the only way I could resolve it was to put each Activity Class in a separate .java file.
I was wondering if all Activities need to be in separate .java files, or am I missing something.
I am a Java professional. Now I'd like to write an application for the Android platform.
What is the initial step I need to take?
How does my Java programming experience help in this case?
Is there any class generators to process web services in Android/Java? I may have to write my own to generate classes against WSDL but I'm trying not to. Also is there one for REST services as well?
If not providing me with discovery service suggestions like disco/wsdl are good enough.
As the title says i'm new to the Android community, and i don't have much experience on the development side either. but i am very interested in getting started. I see that Android apps are based off of Java... So would it be better for me to learn Java before getting started with the SDK and eclipse? Or is it just the same to jump right in on App development and learn on the fly?
View 12 Replies View RelatedI have made apps for the iPhone, but want to also code for the Android but want to know if it is first worth my time, second worth my having to learn another language, and third worth the effort in the sense that am I going to make a profit from this. Also if in any way Android code is similar, then will it be hard to bring the iPhone (Xcode) files, or copy and paste my iPhone code into the Android code.
View 2 Replies View RelatedEssentially Im trying to get many many java clients connect to a socket on my ColdFusion server (Using the Socket Gateway). However before i even start to code this, Im a little confused about sockets and their performance. First of all, are sockets meant for many(1000+) clients connecting to one socket (say port 2202) on one server? How is the performance if all there waiting for is basically a ping, or something such that when these clients receive this "ping" they can go get some new data.
View 5 Replies View RelatedI have developed an application and want to sign it. After signing the application when I try to Align the final package with zipalign. But there's no file called zipalign in tools directory. Can someone guide me regarding this?
Moreover, after signing the application when I try to install the application it gave me "com.satloc signatures do not match the previously installed version; ignoring!". To remove this error I tried -wipe_data. After doing this I again tried to load the application with adb install SatLoc.apk but it again gave me an error this time it
DDM dispatch reg wait timeout Can't dispatch DDM chunk 52454151: no handler defined Can't dispatch DDM chunk 48454c4f: no handler defined pkg: /data/local/tmp/SatLoc.apk Failure [-12]
What is this and how to remove this? I want to load the signed application in emulator. Is zipalign necessay for this purpose? If yes then from where can I get zipalign utility.
I've got a common use-case wherein a user selects one item out of many (say, on a spinner or autocomplete list), then enters the data. For example, let's say the user selects a country. Ultimately, the data I want is the country code, not the country name; but the users will want to select based on name, not code. To put it another way, user's will select "United States", but I ultimately want that to translate into "US".
There are a lot of countries. Is there an easy way to setup a mapping in Android to hash from the name to the code? I've thought of a few solutions, none of them are quite satisfactory in my mind:
A database containing country/code, which I can query on. Setting up all countries as strings in strings.xml, then retrieving the resource by name. Creating a huge Map in code and using that. (This is the least satisfactory answer).
Find a lib which can provide url parsing/building functionality which can be used with Android platform. Character escaping is desired.
View 1 Replies View RelatedI am trying to use the SDK's DDMS utility to capture screens off my Droid X. I have installed the Java JDK and the Android SDK. I set up the USB driver on my Windows laptop and connected my Droid X to the USB port. Windows XP can see the Droid just fine in Windows Explorer as a removable USB device, but the DDMS utility shows no devices. Running "adb devices" in a DOS window lists no devices either. Yes, the java.exe location has been added to my PATH. Yes, the Droid is set to allow USB debugging. So why can't DDMS see my phone?
View 2 Replies View RelatedI'm conceptualizing an app that would *ideally* service as dashboard admin of the users SD Card. Is it possible to create a utility app that would be act as a file browser/manager for all the media on an SD Card? does this app already exist? In the event this is possible. I'm interested in sourcing a freelance developer help that can make this happen.
View 2 Replies View RelatedCan anybody suggest what functionality to provide in a query utility class/classes? The idea is to provide a database utility package for android developers. I just wanna do it for android community and of course for my learning.:-)
View 5 Replies View RelatedDuring the installation of my Android SDK, I am getting stuck during the process where the manager goes out and downloads all the revisions of the APIs and the SDKs.
It is potentially due to a socket issue that typically occurs when a database query is called and there are a large number of TCP connections... according to googling my error (No buffer space available (maximum connections reached?): recv failed )...
So I just need to know if there is a way, other then using the Android download manager, to download / update my computer with the following Android SDK components:
Downloading Documentation for Android SDK, API 7, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 2.1, API 7, revision 1
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 7, revision 1'; it depends on 'SDK Platform Android 2.1, API 7, revision 1' which was not installed.
Downloading Google APIs by Google Inc., Android API 7, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 2.0.1, API 6, revision 1
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 6, revision 1'; it depends on 'SDK Platform Android 2.0.1, API 6, revision 1' which was not installed.
Downloading Google APIs by Google Inc., Android API 6, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 2.0, API 5, revision 1
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 5, revision 1'; it depends on 'SDK Platform Android 2.0, API 5, revision 1' which was not installed.
Downloading Google APIs by Google Inc., Android API 5, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 1.6, API 4, revision 2
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 4, revision 2'; it depends on 'SDK Platform Android 1.6, API 4, revision 2' which was not installed.
Downloading Google APIs by Google Inc., Android API 4, revision 2
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 1.5, API 3, revision 3
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 3, revision 3'; it depends on 'SDK Platform Android 1.5, API 3, revision 3' which was not installed.
Downloading Google APIs by Google Inc., Android API 3, revision 3
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 1.1, API 2, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading Usb Driver package, revision 3
No buffer space available (maximum connections reached?): recv failed
I can not find any utility to parse the ini file in android.
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