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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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?
View 4 Replies View RelatedI 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.
View 4 Replies View RelatedI 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.
View 2 Replies View RelatedI am making an app for Android, in my Activity I need to load an array of about 10000 strings. Loading it from database was slow, so I decided to put it directly into one .java file (as a private field). I have about 20 of these classes containing string arrays and my question is, are all the classes loaded into memory after my application is started? If so the Activity in which I need these strings would be loaded quickly, but the application as a whole would have a slow start...
Is there other way, how to very quickly load an 10000 string array from a file?
UPDATE:
Why I need these strings? My Android app allows you to find "journeys" in Prague's public transit - you choose departure stop, arrival stop and it finds your journey (have a look here). My app has a suggestions feature - you enter leter "c" as your departure stop and a suggestions ListView appears with stops starting with "c". For these suggestions I need the strings. Fetching the suggestions from database is slow (about 400ms on G1).
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.
View 1 Replies View RelatedDoes anyone know how Java thread relates to Android native thread? Does it map one to one?
View 2 Replies View RelatedI 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?
View 2 Replies View RelatedI 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)?
View 6 Replies View RelatedIs 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?
View 1 Replies View RelatedI get about 50 of these coming from my users each day.I realise that this is a Motorola Droid bug - http://code. google.com /p/android/issues/detail?id=5164 Is there anyway I can catch this error in my code?
View 1 Replies View RelatedI have a normal Java application, normally, we start an Android application from a Main Activity, now I must start it from my application.
View 8 Replies View RelatedJava/android how to start an AsyncTask after 3 seconds of delay? how i can do that?
View 2 Replies View RelatedI know some decent stuff of java !!! But have absolutely no clue about XML.... Please help me as to where to start and how is the linking between XML and Java codes in a standard ANdroid App !!!
View 2 Replies View RelatedI 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?
View 8 Replies View RelatedI'm a beginner in programming. My experience so far is only in Actionscript 2 and 3. So I have a basic understanding of declaring variables, loops, arrays, if/then, do/while... I'm wanting to move to developing for Android phones so I'm wondering what suggestions people have for where to go next. Should I jump right to Android? Start with a 'beginning Java' approach? Or should I go some other route to beef up my knowledge of OOP concepts before launching into Android? I have my Dev environment set up and completed the Hello Android tutorial and I'm just wondering if I am going to be in over my head quickly?
View 6 Replies View RelatedI wrote an android app and so far it works perfect except for on one phone. It is the exact phone that I have with 2.2 on both phones and mine works perfect. The other phone is getting force close all the time but only when opening an activity that queries my image DB and tries to show a gallery. Every activity crashes in the same place, the viewimages. At first I thought it was the intent that was doing it but one of the activitys does not have the intent, it opens the images below the gallery. This works on the emulator, on my moto droid and on a few other different droids. Here is the code for the gallery and my bitmap decoder.
The error is below that.
CODE:..............
Here is the error
CODE:.....................
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?
Apart from knowing a bit of C, I have no experience in software development.I want to know from where to start learning to build android applications apart from learning java? What are the steps?
View 2 Replies View RelatedI 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?
I know about camel case rules, but I'm confused with this m rule. What does it stand for? I'm a php developer, "we" use first letters of variables as indication of type, like 'b' for boolean, 'i' for integer and so on.
Is 'm' a java thing? Does it stand for mobile? mixed?
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 ?
View 3 Replies View RelatedHello, 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?
How can i get notification when user send message from mobile?
View 2 Replies View Related1 . 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.
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?
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.
View 6 Replies View RelatedI'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]
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?
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