Android :: Native Android Application Java Front End
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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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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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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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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May 8, 2010
Does anyone know how Java thread relates to Android native thread? Does it map one to one?
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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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Nov 1, 2010
I have a need to force my application to the front under special circumstances. I know its against the good coding philosophy but I am working on a turnkey solution where I control the complete device. The app is used internally as a business tool and supplied to the users on a stripped down device. I have searched but cannot see a way but know that it can be done as in the Application Protection app. This can react to the launching of an application and kill it / allow it by entering a password.
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Aug 30, 2010
I am trying to make an application which will triggered by SMS, and show in front of the standby screen. My application will only use a small portion of the full screen, and the background is the android standby screen. I have searched some android examples but those application will always fill full of the screen, can anyone give me some guideline on how to make an such application?
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Jul 24, 2010
I would like to be able to use the OpenGL API from both Java and C (via NDK).
In Java, there is a GL object passed, which has all GL methods on it.
In C, you just talk to the native library.
In a single onDrawFrame callback (for which Java is passed a GL), can I use methods on the GL object, and also call NDK methods which access the openGL library?
In other words, is the GL object just a wrapper for the same instance of the native library?
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Aug 4, 2009
I want to prevent native application to receive message.I want that my application only receive message. Is it possible ? if yes then how ? can i access the received message and delete it ?
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Oct 7, 2010
Hello, I would like to create a zip file from files located on the sd card, I have managed to do that using java but I think that the result is too slow, so I thought of going native using the android NDK.
My questions are:
Does anyone know any C/C++ library to zip unzip files that will work on android?
How to know if the library will work on android?
will this make any difference on performance?
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Sep 7, 2009
How can i get notification when user send message from mobile?
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Aug 6, 2010
1 . can we get any event when user tap/touch native application(i.e. messaging,contacts).
2 . i know that any application launch by intent in android, there is any way to know which application launch with launch of application.
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Nov 8, 2010
We want to migrate a huge complex native program to Android system ,running it as a background service accepting command sent from Java Program using JNI along with IPC. However, the Android NDK state following words:
Please note that the NDK does not enable you to develop native-only applications. Android's primary runtime remains the Dalvik virtual machine.
Does that mean we have no way to run an standalone native-only application on Android as a background service? The native code can only exist in the form of library that will be loaded to the virtual machine through JNI?
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Apr 22, 2010
I tend to believe that developing mobile applications in an enterprise environment is best suited by developing intranet web applications. That said I have been asked to think about whether there are specific enterprise applications that could only be accomplished or would be more successful as native applications. I am curious as to what the Stack Overflow community thinks.
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Feb 27, 2010
I'm trying to follow the example from google: http://code.google.com/apis/maps/articles/android_v3.html
Using the example files from their SVN repo: (http)gmaps-samples.googlecode.com/svn/trunk/articles-android-webmap/
But although it seems to compile and export it fails; can someone sanity check that its not just me this fails for and any hints as to if its a quick thing to fix, I've been prodding it with try/catch for the last 2 hours to no avail.
Forgot to add
It Compiles and Uploads to the emulator (and to my phone) but running it just results in
The Application WebMapActivity (process com.google.android.examples.webmap) has stopped unexpectedly. Please try again. [Force Close]
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Nov 24, 2010
I've talked to a lot of people recently who say they are expecting to stop writing native mobile apps and start writing web apps once HTML5 gets more fully baked in mobile OSs. I just finished my first HTML5 deep dive, and I'm not yet convinced.
Will HTML5 work as a replacement development platform for native apps, or are there certain things that require targeting the native runtime?
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Feb 25, 2010
wanted to add a menu option in native email app in android . I have used intent filters but i am not successful in achieving it. Actuaaly i want to a menu option to the native mail application in Android.. so that my activity / app can be launced on clicking that option. This feature has been successfully achieved in Blackberry and even in android for gallery application. On android i have achieved it by using intent filters.
<activity android:name=".DisplayAlternativeMenu"
android:theme="@android:style/Theme.NoTitleBar">
<intent-filter android:label="My Activity">[code]....
This basically display an menu item"My Activity" when u press share in Gallery. and clicking on that launches my activity .But unfortunately it didn't work for Email Application. Looks like the pair of action & mimetype i am specifying is not correct. which action & which mimetype should be used. Also if there are any permission required,what are they?
My aim is to add an alternative menu while pressing menu in Compose Email(When a mail is composed) of the native email application
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Aug 4, 2009
I am migrating a c program from linux to android when lauch it in the shell everything is ok, but when I lauch it from UI with Runtime.getRuntime().exec(...), there is permission issue for the file change notification, also I know there is mechanism of permission on android, but I can not find related type of permission in Manifest.permission list.
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Nov 4, 2010
This is what I'm trying to support. Can this be done?
a) User is an Activity A in my app. b) The user is taken to the native dialer when he chooses a particular action in my Activity c) User presses the back key d) Taken to homescreen
Is there a way I can change it, so the back key press returns him to my app, instead of native homescreen?
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Jul 2, 2010
I am facing in Android display system(Video Rendering using Surface Flinger Native APIs).
As for my understanding, Android display system relies on Surfaceflinger library( a system wide screen composer). Surfaceflinger runs as a service along with Mediaserver service, Camera service, Audioflinger and these services interact with each other through Binder APIs at native level. If any user application wants to access SurfaceFlinger native APIs, it requires Surfaceflinger Access permissions.
My requirement is that I want to create a SurfaceView at the JAVA level (Android Application level) and render video data to that Surface, means, pass video data to the Surface flinger library by invoking native Surface Flinger APIs. But, because of Permission Problems, I am not able to invoke Native Surface Flinger APIs from Application Layer.
Is there any ways to invoke Surface Flinger Native APIs from Application Level ?
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Oct 10, 2009
I am a android developer, I stuck into a problem, how to read really big images with Android API, I am wondering how native Gallery (Camera application) is reading bigger images so fast. can any Android Engineer here direct me to the piece of code that android engineer used to draw bigger images.
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Mar 8, 2010
I would like to reuse the exact same font-face etc... like Android uses in the PreferenceScreen
Here is a screenshot I am looking to reuse the title, and the summary style from these views.
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Nov 12, 2013
I am unable to see my front cam tap icon in my camera application?
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Jul 30, 2010
I want to add <uses-permission> via programatically .I want to telephone number of the device.For that i need to access the phone state.But i need to add that permission only with Java code at runtime. Is it Possible to do so. (or) Can you suggest any alternative way to read the telephone number .?
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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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Dec 8, 2009
I m a programming noob here..i need help on some issues here. I understand that Android is built from Java. I need to know if i can run a java application on android? Or can i run the application with minor change to the current coding? I read about Java ME can run on android but what abt .Jar file?
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