Android :: Porting Java App To Phone / The Basics
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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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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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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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 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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Nov 1, 2010
Since the Evo has just been announced by Sprint that all of us employees / club members can now get the Evo starting tonight at midnight est., I would like to ask all of the forum users where we should all start. I know these forums will take off once all of these new users get their phones and have questions. Is there some basics that we should do before we install too many apps? Recommended first apps? Root or not?
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Nov 18, 2010
I am interesting in: what is the best way to write applications (for example games or business apps) for so different platforms like Android and Phone 7 with minimal changes in source code, logic and other developing artefacts? Or it is impossible and i must write my application two times from the "ground" for each of devices? Please tell me about your experience?
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Apr 28, 2010
Is it possible to port a C++ application which uses the STL extensively to Android? I understand that currently the NDK does not support this, but is there any effort (open source or otherwise) underway to achieve this?If not is there a way to cross compile libstdc++ for Android?
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Jul 7, 2010
I am attempting to put my C++ program onto an Android phone but have run into several problems with the library linking. It seems most of the useful information I find on this topic through google is outdated (motz) or simply does not account for the complexity of my program. I have been able to run simple C programs but fail when attempting to use libraries outside of Android's Bionic/libc.So my questions are:
Is it possible to port pre-existing *.so libraries onto Android? If so, how could I do this without seg faulting?
Should I be using the CodeSourcery compiler (arm-none-linux-gnueabi-*)? How can I work around the lack of a separate thread library?
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Aug 19, 2010
I'm feeling the itch to go beyond the standard settings in Android and get into rooting. I'm following along with a lot of the developments here, but I often feel like I'm missing a lot of the background knowledge and vocabulary (what is recovery, how does one access it, what are all these different programs - nandroid, adb, etc.) to have a really strong grasp of what's going on here.
Now, if this were my computer, I'd just hop right in and start following along as best I can and mess things up along the way, no biggie, I have multiple computers and I'm competent to fix them.
I don't have a landline though, so I want to be a little more prepared before I accidentally brick my link to the outside world. Is there a good "tinkering with Android primer" out there that any of you would recommend?
Also, how easy is it to get back from whence I came on the Ally? I read the thread on unrooting, and I honestly didn't understand a lot of it, so I'm just looking for a "not gonna happen" or "it'll be easy when you finally understand."
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Oct 29, 2010
I have a couple basic questions I'm hoping I can get answered before I start messing around with different ROMs/Radios/Kernels. Before I rooted, when I felt like things were getting cluttered or had an OCD attack, I would do a factory reset. How does that work?
What "source" files are used? Is the emmc directory the only directory not "cleaned" in a factory reset? Keep in mind I'm used to my workstation/laptop experience where I would format, then install a clean version of the OS from a CD/DVD and then I would install 3rd party apps and move my data back?
Any analogies would help my simple mind! One day I did a factory reset, the decided to root. Everything went perfect. I moved some bloatware to an apps.disabled directory, then did all my customizing again. Now I want to play with different ROMs. I do however want to hedge my bets in case I ever want to go back to where I am today. I've done a clockworkmod backup.
Does that essentially copy all the phone storage (except SD Card data) over to the SD Card? If not, what is left behind. Will a clockworkmod wipe erase ALL of the on board phone storage (except the SD Card data)?
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Mar 1, 2010
Could someone guide me to an online tutorial that explains this really well?
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Jan 28, 2009
I have a huge midlet that is completely based on javax.microedition.lcdui and javax.microedtion.m3g.I need to completely rewrite my midlet to port it to android? Is there a way to use javame class in android?
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Aug 22, 2009
jarkata commons lib is very useful for our everyday development.is there any porting to android?or is there a good way to porting the jarkart commons libs to the android environment?
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Jun 18, 2009
My game runs fairly well on my phone, but i want to increase the performance by using opengl. However currently i use the Canvas. I am a beginner in opengl. I have to port all my drawing code to opengl. However can somebody give me directions. For example how do i do the following in opengl:
c.save();c.scale(0.3f+scale, 0.3f+scale, width/2, height/2) c.drawBitmap( bMsg.bitmap, width/2 - bMsg.bitmap.getWidth()/2,dy+height/2 - bMsg.bitmap.getHeight()/2, MESSAGE_PAINT);c.restore();
And why cant i just use Canvas as an abstraction layer (facade) for opengl. An implementation of canvas could call the correct opengl methods in order to render. Why do i have to port all my code. I thought the canvas was a good abstraction interface to a drawing surface, why do i have to bother with opengl? It looks like this is possible, when is see the following contructor: "public Canvas (GL gl)" Also the this seems usefull. SURFACE_TYPE_GPU Surface type: creates a surface suited to be used with the GPU So what should i do? Re implementing the GamePainter completely and call opengl functions directly? Or is there some kind of abstraction mechanism, so that i can use OpenGL with just a few lines of code?
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May 24, 2012
I own an Motorola XT316 device, and i can't find an Custom ROM, so i was thinking to port one from Galaxy 5 (i5550) or LG Optimus me (same hardware, same screen, maybe same camera).
The problem is how to do it, because theres some differences between them like the camera. The XT316 has an locked bootloader, this can screw everything?
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Mar 1, 2013
I tried to port my Micromax A57 [Base] with Karrban A5 [used for port]. When I installing everything works great but, it stuck at boot. How do i check where is the fault or is there anything to do ?
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Dec 10, 2009
Not really a "problem" per se, but an annoyance.I ported my number across to Orange from Voda but in the Phone Status the MSISDN field is still displaying the old number. It's not that I can't remember my number (it's a memorable no. which is why I wanted to keep it), but it's annoying me as I can't seem to get this field to reflect the change.I've tried rebooting it after leaving the SIM out but no difference.Is this just a "bug" or is it something Orange will have to fix/update for me by sending a request to my SIM or something?
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Jun 4, 2009
I am a newcomer to Android. I know the C And C++ programming languages, but I do not know Java . I want to learn Android right from basics, but I could not find any relevant link or e-book that can help me. Can I begin to learn Android without knowing Java or should i go to learn Java first? From where should I learn Android which should be easy to grasp and learn for a newcomer like me.
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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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Nov 5, 2010
We are implementing a sever-client architecture and some of the client apps are supposed to run on android OS. The first idea that came to mind was to use Java RMI, but the RMI api is obviously not implemented for android.So
1) Is there a way to use the Java RMI api in an android application? Can I just import it from the standard java library?
2) What are the possible substitutes for RMI which will work for both android and desktop applications?
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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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Sep 17, 2010
How can I silence the android phone in java? A code sample is VERY helpful.
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Sep 19, 2010
I wish to run a Java app on my HTC wildfire phone, But the phone has no Java, Where can i get mobile-java from?
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Sep 24, 2010
Does someone know how to generate a javadoc for an android project? I found searching the net this info http://www.androidjavadoc.com/?p=63 , but i don't understand where can i find the file "droiddoc.mk": "All javadoc stuff is concentrated in the ROOT/build/core/droiddoc.mk".
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Nov 24, 2010
I 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?
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Jun 30, 2009
I would like to build an app that OCR a pictures and get text from them. What java library should I use?
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Jul 17, 2009
I wanted to check whether there is any JAVA Coding standards in Android platform for performance improvements.
For Example, like an Effective Java code in J2EE environment is to defined the number of elements in the ArrayList constructor rather leaving it blank (new ArrayList(noOfRows)) etc. I definetly suspect these performance tuning tips should be available because of the memory and resource constraints.
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May 23, 2010
I was wondering what the simplest program for sending an object from my Android phone to my computer wirelessly (via LAN) would be. I have created Java RMI programs with a server and multiple clients, so I have a grasp of the concept. However with android I'm just not sure where to start.
What I am aiming to do is send some sort of information (could simply be text) to my computer and my computer will do an action. I have the GUI interface's and the actions to be carried out all worked out, just the sending of some sort of information is getting me.
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