Porting From Java Using Swing And AWT Libraries Into Android
Nov 8, 2012
I currently have an application using the libraries swing, swing.table, and awt on a java applet that I have running. I want to know what are the steps to get the application running as a native android app. I heard that I could use programs like Phonegap to just release a web based app for multiple platforms, but I am new to Android Programming (so far I just made a Hello Android app). I searched swing and awt, but I could not find any useful info.
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Oct 13, 2010
I have developed a 2D game in Java Swing for a desktop application. My characters are simply JLables that move around over a static background image. I do the animations for the characters walk sequences by changing their image every certain number of game logic loop iterations. Being new to android, what would be the best way to port my game over to android since Swing is not supported? Is there something like a JLabel that can be used for characters? A whole different approach?
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Oct 17, 2010
I want to use a control similar to Swing JSpinner in an Android application. I know that Android has a widget called Spinner, but it's more like a combo box than a JSpinner. I've noticed that DatePicker and TimePicker widgets are using components that are just like JSpinner. The only problem is that I don't really want Date or Time. I just want to get some integer, say from 1 to 50, that user chooses. I've searched Android API reference in and out, but I couldn't find any clue on how to do this.
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Dec 26, 2009
I have to add java libraries javax.xml to the my android project, while I am trying to add them it shows the error "Conversion to Dalvik format failed with error ".
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Nov 24, 2009
I'm attempting to port a normal Java program over to Android, however I am having a problem with a huge number of missing Java packages (e.g., Android Java does not have java.lang.management). Is there a way for me to work around this, such as by adding the Java modules that I need?
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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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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.
CODE:.............
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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Nov 18, 2010
Does anyone know of any video encoding/decoding libraries written entirely in java? Bonus points if it works on Android. I'm trying to write a video decoding application for android, where I have access to the frame level decoding functions (which is absent in the android API MediaPlayer class)
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Oct 15, 2009
I know Java apps can be run in Android. But what I want to know is this: I have a perfectly normal Java app and I want to port it to an android platform. What changes would I need to do to my app in terms of GUI and other code to make it usable in Android? I know Android uses XML file to control the look and feel of its app. So would I need to change my GUI completely?I just want to know the general overview of how porting may be done. If anyone could point me to right resources, that would be great. Also, for your info I'm a newbie to developing android app, so please be patient with me.
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Sep 30, 2010
Is there any Java validator libraries i can use to validate text input from an android app?
i know that in spring there are validators for various different types such as checking if a value is a int, if a value is a valid email, etc etc.
Anything similar in core Java or even android?
cheers in advance. i don't want to re-invent the wheel if its already been implemented. i could always sue Java reg expressions to construct my own ones but was wondering if their was one done specifically for email formats.
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Nov 6, 2012
how to structure a very simple (but computationally intensive) app which has the following general characteristics (no details needed).The app has some data (say 2MB) statically stored.When the app starts this data is preprocessed and a large structure of about 40Mb is created.
After the initialization, the app has one text field for input, one for output and a button (for start/stop).The user enters a query then press the start button.The app computes a result using the large array.If the calculation on the input takes too long, the user can stop the processing with the stop button and start again with a new input.
When I was doing this under windows/linux with C/C++, I had no problems: I used a large global array and two threads, one to draw interface and respond to user (mouse, clicks, etc.) and one to perform the computation.Which is the standard (best) way to structure this kind of app in Java/ Android ?
Should I use an Activity for the graphic interface and a Service for the computation ? Can I build the large array in the Activity when the app starts and pass a reference to it to the Service every time Start button is pushed ?
I just need to be pointed in the right direction, to avoid some blind alleys. In a sense using c/c++ would be better, but I read that developing in Java (for Android) is much easier so I will try first with Java and revert to C only if the app will turn out to be too slow.
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Oct 4, 2009
I'm trying to run J2SE JAVA Application on Android.As you know, the main problem is that J2SE classes such as awt, applet, and etc are not supported in Android. Consequently, this means that I should replace those many java classes with Android classes.So, Do you have some idea or information for replacing J2SE classes with Android classes?
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Jul 1, 2010
Hi Android Developers, "Android includes a set of libraries which provide MOST of the functionality of the Java libraries". Does anyone know what is ment by MOST and which libraries are NOT supported compare the the JVM?
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May 26, 2010
I've been contemplating (re)building an app on iPad for some time, where I would use objective-C and DSMI to send MIDI signals to a host computer. This is not bad (I mean, except for actually writing the app).Now I'm contemplating perhaps developing the app for Android tablets (TBA).In Java, what options are available for MIDI message communication? I'm quite familiar with javax.sound.midi, but then I would need a virtual MIDI port to send messages to the host.On the other hand, if the app were done in Adobe AIR, what options would I have available for communicating with MIDI?Obviously another option is to send/receive messages over a TCP/IP socket to a Java host, and talk that way, but it sounds a tad cumbersome... or perhaps not? DSMI does use a host program, after all.
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Oct 16, 2009
I know Java apps can be run in Android. But what I want to know is this: I have a perfectly normal Java app and I want to port it to an android platform. What changes would I need to do to my app in terms of GUI and other code to make it usable in Android? I know Android uses XML file to control the look and feel of its app. So would I need to change my GUI completely? I just want to know the general overview of how porting may be done. If anyone could point me to right resources, that would be great. Also, for your info I'm a newbie to developing android app.
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Jan 5, 2010
I need to create a Timer to update the UI at regular intervals. But the Swing Timer class is not available on Android. (I would avoid creating threads and then use the Timer class from java.util package)
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Nov 19, 2010
First of all I'd like to mention I am very new to Java programming. This Android project is my first experience with Java. So for one task I need to strip HTML tags from a string. I was thinking about using this answer Removing HTML from a Java String to do this task. In order to do this I need to be able to import javax.swing.text.html.* and javax.swing.text.html.parser.*.
I went to the properties of my project and attempted to add this library to my project. I read that this was included in the rt.jar file which was located at /usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar. I was able to use the imports but it seems like it added a million libraries I am not using. Will this negatively effect my application? What is the correct way to add just the one extension?
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Jun 21, 2010
I want to display a tree like data structure, for the Swing JTree is ideal. Is there any widget that provides that? Or any implementation of Swing for Android?
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Dec 5, 2009
I am having a little trouble using some external source files. I am new to eclipse and the methods used to import external source files. Basically this is what I have done. Downloaded the source files for a java project called "TrueLicense" via CVS. Imported this library by going to "Projects" and adding the "TrueLicense" project (I am not sure if I should do this in "Source", "projects" or "Libraries"?) Imported the required classes into my android project without any compile errors.
When I run the program I get:
12-05 15:52:28.632: WARN/dalvikvm(724): VFY: unable to find class referenced in signature (Ljavax/swing/filechooser/FileFilter;)
Then a whole lot of other errors. This seems sensible as there is a sections of the TrueLicense package that used Swing. How do I only import the parts of TrueLicense that I need?
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Sep 10, 2010
I was really excited today when I saw the Tools r7 and ADT 0.9.8 were available and the latter had this note;
Fixes problems with handling of library project names that contain characters that are incompatible with the Eclipse path variable. Now properly sets up the link between the main project and the library project.
I create the library (foolib - no spaces, no caps, no punctuation). So far so good. I go to the main project, go to preferences --> Android. In the library box I add the new library. It appears. I press Apply. I press OK.
Nothing happens.
I return to the preferences, the library is no longer there JUST LIKE BEFORE.
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Jul 13, 2010
I looked around for info on this in the group but couldn't find any... so far in my OpenGL programming I've just done everything directly, but I was curious if anyone had written any "wrapper" libraries for it besides min3d. Min3d is great (or is getting there) but it's GPL'd, making it unsuitable for a commercial product (if my understanding of the license is correct).
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Oct 15, 2009
We have been using gdbserver to debug our JNI code as follows. We have been less than successful -- breakpoints do not always get activated, sometimes we get SIGILL, and we seldom ever get a useful stack when the debugging stops on SIGSEGV, sometimes the program dies with SIGTRAP!!!
We have occasionally been able to have debug sessions with s/n, but since pretty much every SEGV has resulted in either a damaged stack, or at least, gdbserver can not find the stack, it's a pain.
Is there something we are missing? Is there some reason to use the 4.2.1 vs 4.3.1 toolchain? (Why are there two toolchains? I assume because of bugs in each that are fixed in the other... which bugs?)
We guessed that the "dalvik" process that we wanted to debug was app_process --- we found this out by looking at /proc/XXX/cmdline on our running activity.
This is what we do typically do(repo sync directory is in /build/m1 for me)
invoke:/build/m1/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin/arm-eabi- gdb
(some of us use -tui, some of us run it under Xemacs, etc.)
We then do:
CODE:..........
We then start our activity, adb shell, discover the PID of the activity, discover the IP of the phone with "netcfg", and:
app_15 1815 49 107468 15744 ffffffff afe0d4a4 S org.credil.thomas_watson.videophoneservice
# gdbserver 0.0.0.0:1234 --attach 1815 Attached; pid = 1815 Listening on port 1234 Remote debugging from host 132.213.238.4
(gdb) target remote 132.213.236.179:1234
This is with a physical device. With an emulator, one has to, of course, run the adb forward stuff. (Too bad that doesn't work with a real device too, as then I would not need to run gdb over the wireless)
Program terminated with signal SIGKILL, Killed. The program no longer exists. (gdb) target remote 132.213.236.179:1234 Remote debugging using 132.213.236.179:1234 Error while mapping shared library sections: /system/bin/linker: No such file or directory. warning: .dynamic section for "/build/m2/out/target/product/generic/ symbols/system/lib/libc.so" is not at the expected address (wrong library or version mismatch?) ... many more GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code. tkill () at bionic/libc/arch-arm/bionic/tkill.S:52
(gdb) break sendframe Breakpoint 1 at 0x80401086: file /build/m1/packages/apps/ VideoPhoneService/libvideophoneservice/src/rooster.cpp, line 96.
(gdb) c Continuing.
Program terminated with signal SIGTRAP, Trace/breakpoint trap. The program no longer exists. (gdb)
(btw, an annoyance about googlegroups is that it seems that it looks at my SMTP from header, rather than From:... This basically means that I can not post from gmane.org via NNTP, which is a shame. Is there a secret NNTP access on googlegroups.com, I wonder?)
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Jun 17, 2009
I need to know the footPrint of Android and its various Libraries
- Hide quoted text -
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Apr 1, 2009
Is it possible to use a native C/C++ library? If so, are there any restrictions for those libraries to be used?
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Oct 14, 2012
I'm currently making a purely math and algorithm-based C++ library. Will I be able to use it when developing for Android? How? I guess writing some Java wrappers, but will it then be usable on all JVMs?
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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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Oct 14, 2010
I need to add few shared libraries to the andriod as part my application installation. Can you please suggest right information resources regarding the same.
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Sep 30, 2010
Is it possible to use third-party libraries for display pdf?I mean to use custom pdf view, in which I can pass pdf url and view it in new Activity.I want include libs into project and use their as resources.
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Oct 2, 2009
I'm building an app where I want to architect the app layer separately from the service layer (not android services). So I'll create a service interface(the apis) and then create a class(es) that implement that service interface. Inside the android application layer, I want to code to just that service interface. I think this is similar to how the google maps apis works. the api interface and stubs are in the framework, then each device actually provides the implementation. I don't need to go that far, but I am wondering how I package this up. One, where would I put these interfaces, so I can code to them in the app layer (like Activities). Second, how do I tell Android where the implementing classes are? I'm guessing this is somewhere in the manifest? For now I think I would probably just build the service implementation with the application source code, if that's easier. Eventually I'd like to break that out and drop it in as a 3rd-party jar.
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