Android :: Java Application / Native Library Integration
Apr 8, 2009
I have developed bluetooth application where native library will be initiated by Java application (using JNI wrapper). JNI will call the entry function of the native library and then it will create Pthread to for scanning the device. Once Scanning is over, i will get the callback which i registered during the entry function of the native lib (called by app). But i haven't received the callback, but if i run the same native library in the shell (executable from the shell terminal) it is working fine. Can any one help me, if there is any specific architecture needs to follow while developing Java application based on native lib?
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Sep 5, 2010
Is there any ready library to read ePub format? I found ePublib in
http://github.com/psiegman/epublib. I'm still learning how to use it. I wonder if there is ePub jar which ready to use for read ePub format in android.
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Apr 23, 2009
I have a native application that I would like to start from a Java interface. Does anyone know of a good way of doing this? can start the application using adb, with no problems. I can also start the application using Runtime.exec(), but that doesn't work so well for me; I need the application to run outside of a Java Runtime Process. Any ideas?
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Aug 26, 2009
I created a jni library which depends the third shared library, I must copy the third shared library to /system/lib, otherwise, Java application can't load jni library. But you know, on G1 with official OS image, /system/lib is readonly. I tried to call System.setProperty to set java.library.path to the location stored the thired shared library before load jni library, but the issue still exists.
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Nov 5, 2009
I am trying to run a native executable from inside an android java application. The native executable exists in my assets. At start of activity, I copy it from assets to my application cache Dir. then I use Process Builder to run it.I tried to run "chmod 777" on the file and on cache directory containing it and I ensured permissions are granted using adb shell. but I still get this permission exception.
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Sep 17, 2009
I am currently working on porting a application written in C in android platform. I need to know that can i invoke/call the getSystemService from the C application using invocation interface by JNI. Meaning using a .java file which will interact with the interace provided by the android.telephony.TelephonyManager.java for using getCallState() and other mehthods.
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Apr 2, 2010
I using Eclipse Gallileo to develop Android application and Java library for this application. Please, help to set Android application dependency from my custom Java library rightly. I want this library automatically build if necessary and be included to .apk file.
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Jun 25, 2010
I am trying to produce a java front end, via some sort of Android "view" that will allow me to show the console output from a native C/C++ application binary. I followed the steps from various google searches and I have a tool chain that produces native binarys that I can then "adb push" onto the android device. I can either use the adb shell or a console application like ConnectBot to native to the pushed path and run the binary like so: ./someApplicationHowever as I stated in my opening sentence I would like to wrap this binary with a font end producing an apk that can be loaded onto the phone and when it runs it opens up and directs the stdio output from the native binary to the screen.
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Dec 8, 2009
Is there a setting, as with voice calls, to have all SMS commands directed through Google Voice? I've canceled my Verizon texting plan and want to send all of my texts through Google Voice. Obviously I can do this by composing messages through the GV app, but I would like to click on a contact's page and have GV automatically open to send the text message. Much like Handcent opens when you select a contacts texting option, when you have Handcent installed. When I select the text message option from a contacts page (or press their contact picture and then select the text option), the Droid opens the standard text message application to send the text. Interestingly, if I go into the call log, select a recently called number and choose "send text message," it opens Google Voice to send the text message. How do I get the same functionality as above, so that selecting text message from a contact's page or shortcut uses Google Voice to send the message?
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Jun 30, 2010
I need to write a dynamic link library in C++ that is used by Java on Android. As I get, it should be .so library, but I don't know how to do that. I tried Cygwin, but it crashes: Code...
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Mar 20, 2010
I am now writing a java application. On java side I use System.loadLibrary() to load my own native shared library( named a.so ). I want a.so can communicate with another native shared library(named b.so). When a.so and b.so are loaded in the memory, they belonged to 2 different process. I am not familiar with IPC in android and binder mechanism. How can I do to make a.so communicate with b.so?
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Mar 1, 2010
Could someone guide me to an online tutorial that explains this really well?
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Aug 8, 2010
I followed the instructions here on how to create an Android library project, and use it in an Android application:
http://developer.android.com/guide/developing/eclipse-adt.html
But it is not working. I can see the library project is added to my application but I cannot reference anything in it because it won't build. The R.java file from the lib is NOT being added to my application project, so the lib project contains tons of errors, everywhere it tries to reference it's own R.java file.
I don't know if this has anything to do with it, but in the console there are messages stating that the there is "No resource identifier found for attribute 'X' in package 'Lib Package'. My library package has a a few styleable attributes defined for a custom view I made, all of which are being complained about in this console message. The library builds just fine, and I don't get those messages in the console until I hook the library to my application, so I don't know what's up with this.
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May 8, 2010
I am new in the field of ANdroid. I am using FBReaderj code for my project. I want to download a book from my website. In FBREADERJ they have integrated with three site. I want to add my own.
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Jan 24, 2012
I would like to extend the functionality of one of the shared native libraries called from within the android.jar code. How can I rebuild the affected shared libraries such that the android code can utilize my modifications?
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Mar 22, 2012
I have several modules within a single native library, each module is intended to be the compliment to a Java class within the application. How can I call the native functions without having to perform a System. load Library within each Java class? If I load the library in a common class (not through inheritance) the app fails with a link exception.
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Aug 12, 2009
I'm trying to create an app for Android that simply sends a command to an SSH server. No response needed, I just need to be able to send a command. I was wondering if there's any java library out there that I could use? No advanced stuff needed, just a pure connection to send the command.
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Nov 11, 2010
I don't want to code things that already exist.
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May 8, 2010
Does anyone know how Java thread relates to Android native thread? Does it map one to one?
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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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Oct 29, 2010
Is there a Java yaml library as good as snakeyaml for Android? (Or is anyone successfully using snakeyaml on Android already?)
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Aug 7, 2010
I'm writing a JNI library for a game. I have java code that I want to replace with functions from the library. Is it true that most of the devices out there are compatible with my code if I compile it for the default arm processor, or will I find that there are many devices out there that my library won't run on? What I'm asking is, should I maintain java code that does the same thing as my jni library for compatibility purposes, or is it safe to have jni libraries alone? How large is the group of devices that cannot use the libraries I write? Where are there stats regarding what population is using processors other than the arm processors?
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Mar 17, 2009
I need to build a java.beans.PropertyChangeListener which is part of JDK (rt.jar) but not part of Dalvik.
Trying to copy the sources to my Application I get this:
Attempt to include a core VM class in something other than a core library. It is likely that you have attempted to include the core library from a desktop virtual machine into an application, which will most assuredly not work. If you really intend to build a core library -- which is only appropriate as part of creating a full virtual machine binary, as opposed to compiling an application -- then use the "--core-library" option to suppress this error message. If you go ahead and use "--core-library" but are in fact building an application, then please be aware that your build will still fail at some point; you will simply be denied the pleasure of reading this helpful error message.
My solution: 1) build a core library with consisting out of java.beans.PropertyChangeListener 2) integrate that library (jar?) into my application.
My question: - how can I build a core library using eclipse?
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Feb 7, 2009
I am trying to figure out what is the best way to debug a mix of Java and native code? Please notice, that I am NOT trying to develop a native app. The app will be written entirely in Java, using Android SDK. However, I noticed that some pieces of the SDK use native methods (e.g. AssetManager, WebKit, etc). I wonder which tools Google developers use if/when they need to debug a mix of Java and C/C++ code? Eclipse/gdb or there are commercial tools which make the debugging experience less painful?
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May 10, 2010
I have a multithreaded streaming app which has mainly the following 5 threads. 1 Main App(UI) Thread 1 controller thread (in native) 1 audio decoder thread (in native) 1 video decoder thread(in native) 1 thread to query the head position of audio (in Java) Apart from this I have video rendering with OpenGL. My problem is, if I query the thread priority using the Thread.getPriority method (my native threads make callbacks to Java and I am making the query at that point of time), I am getting the priority of each of them as 5. For my audio query thread (the last one in the list) I am explicitly setting the priority using Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_AUDIO); Also for my decoder threads, I am giving higher priority than my controller thread(using pthread APIs in native). But still finally all of them seem to have same priority. Also what should I be doing to increase the priority of my threads(both from Java and native)?
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Jul 29, 2010
Is it possible, from within my android java app, to capture an image of what is on the screen, even if it was written using native (ndk)? I do not wish to take screen shots of other apps, just my own. I can already capture and image of a canvas that I am aware of, but is there a view or canvas or something like it that always represents what is on the screen, so that a) I don't have to capture the separate views images and recompile them, and b) I can see what my native (jni) code is doing with the graphics too?
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Feb 9, 2010
I'm an Android Developer and as part of my next app I will need to evaluate a large variety of user created mathematical expressions and equations. I am looking for a good java library that is lightweight and can evaluate mathematical expressions using user defined variables and constants, trig and exponential functions, etc.I've looked around and Jep seems to be popular, but I would like to hear more suggestions, especially from people who have used these libraries before.
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Aug 28, 2010
I'm making an android client for a web site. my app have to go through the website, parse HTML, post some forms, send HTTP requests etc. What library covering all this stuff you recommend me to use ?
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Apr 27, 2010
I have an existing C++ library that I want to compile into a static library, and call commands from it with Java on the Android platform. I am brand new to Android development, and just need to figure out how to set the Java interface up so my C++ lib works on the Android. Where do I start?
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Nov 12, 2010
I need a library in java that can take HTML content and generate text in the same format that is generated by the Linux lynx program.
That's it. Reasons below if you care.
I need to expose data provided by 3rd party servers to end users on Android. Data format is ancient, in badly formatted HTML, so much that I've tried reading it using java and it fails occasionally (unacceptable). It is also growing every month (preinstall ruled out) and I can't convince them to change to "modern" stuff (life would be great in XML etc.).
Shortest route: I wrote a class to use the W3 html2txt service online (google search it). It worked fine on the app until I got complains and noticed that the W3 service fails occasionally. It's not that big of a deal, but the black box logic expects the output to be in this "lynx like" text format.
So I would like a library to do the conversion (HTML->TXT) in "lynx style" inside the app and avoid the outages in the W3 service. And besides, the lynx output the probably the best I've seen, the most organized and neat.
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