Android :: How To Call Java Methods From C++ In JNI?
Oct 10, 2010
So I'm writing an Android app which uses a large c++ library. I have everything working so that the java app can call the c++ delegation methods, but I'm finding myself wishing I could log messages from c++ to the Android log. This is easy from java, but I'm at a loss as to how to call a java method from c++. My searches found methods for opening a jvm from c++, which is not at all what I want to do. Ideally, I'd like to pass a log method pointer to c++, which could then be used whenever I wanted. Of course, java doesn't support method pointers.
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Jun 22, 2010
Hi, custom classes which are part of a framework, so nothing graphical. One of those (singleton) classes is a Logging class which send logs to my server. I noticed that even though I can call the classes methods in my service it actually won't be logging anything... In my specific example it's osmething like : Logger.getInstance().log("Whatever I want to Log"); Obviously the getInstance is a static method so it can be accessed from anywhere within my project right away.. I was wondering though why this method for example isn't getting called ? Also how do I debug a Service ? Btw I am using of IPC from one of my Activities which gets bound to the service and can start/stop the music for example...
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Nov 3, 2010
i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
package org.me.intent_testing;
import android.app.Activity;
import android.os.Bundle;
import android.widget.;
import android.view.;
import android.content.Intent;...........
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Nov 3, 2010
i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
In 1st activity class
package org.me.intent_testing;
import android.app.Activity; import android.os.Bundle; import android.widget.; import android.view.; import android.content.Intent;
/** * * @author pavankumar */
public class FirstActivity extends Activity {................
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Oct 1, 2010
I have an Java class with a static final method getAll:
CODE:..............
Now I want to hand in null as a value for the where statemant so that it will just be ignored later on in the code. Anyway in the testcase for this method I have: Vector<Category> categories = Category.getAll(context, null);
Which then in turn gives me a NoSuchMethodError. I don't know exactly why it does that. The only thing I could imagine is that the null I hand in would not match the signature of the above method. But how can I overcome this? I already thought of overloading. But this would just end in rewriting most of the code. At least when I do it, how I think.
This is the stack trace I get:
CODE:.......................
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Sep 7, 2010
I want to create one method and call the created Thread inside that method in my Android Application, I am new to Java as I had told before. Can anybody giive me an example of how should I create a method and call a Thread inside that method!
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Nov 5, 2010
I am working on an Android project that uses classes and methods from a seperate JAR file I am also creating, and the issue is with a specific util class called XpathUtil that is throwing a VerifyError every time I try calling one of its static methods. Here is how my XpathUtil class looks like:........................
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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 27, 2009
Is it possible to call methods of a Activity from service. I am running a thread from a service and i listening to some external event from that thread. I am not able to call methods from that thread. Is there any way to call methods from a thread.
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Jul 21, 2010
I am curious whether the AIDL only serves for inter-process communication between several Android apps on the same device, or AIDL provides much wider functionality. Let's say I have a Java application running on some server, is it possible to remotely call methods on that server through AIDL from an Android phone?If yes, do I need some extra libraries on the server-side Java application?
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Dec 7, 2009
I made two applications. One for an activity receiving user input, the other for a background service. In the service package, I create two files (startSensorBroadReceiver.java, remoteService.java). StartSensorBroadReceiver will receiver an intent from activity application and call method inside of the service. There is no erron in the codes but I can not excute what is want. I meet a message like this "The application ServiceExample has stopped unexpectedly. Please try again." could you let me know. what is wrong? and how I can call service methods from broadcastReceiver?
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Jun 1, 2010
I was wondering if it's possible to call specific methods defined within the AsynTask class from another class and/or service ?
In my specific case I have a Service playing some sounds, but the sound is selected from a List with available sounds...
When a sounds is selected it is downloaded from my home server, this takes some time (not much, let's say around the 3-4 seconds, the sounds/effects aren't big in size)...
So my problem at the moment is that I have a service to play those sounds, and when I select one I wanted to show a progressdialog... The way (if I understood correctly) is to use an AsyncTask, but the only thing the AsyncTask will do is telling my Service to play a specific sound from my server... So there is no "callback" from the service to the Asynctask...
How can I call a running AsyncTask, which sits in another class, and tell him all work is done and thus he can stop showing the ProgressDialog ? Or am I over-engineering it and there are other ways ?
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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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Aug 16, 2010
I do an import of the full package name / java file, and if I do a <classname>.<method>, SOMETIMES I can get it to access - other times I get a lot of can't use a static in a non static bunch of talk. I'll admit I'm new to Java, so what do I need to do? Call a class instance first, then call my methods? I'm rather confused by this, as I want to put all of my 'functions' into a FunctionsList.java file, and all of my main Activity (UI) into a MyActivity.java file.
For example:
<MyActivity.java>
import com.example.FunctionsList;
private class MyActivity extends Activity {
FunctionsList.function();
}
9/10 times I get that static/non-static error. If I put all of my functions into MyActivity.java, I have zero problems!
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Mar 14, 2010
I'm looking into writing simple graphics code in Android and I've noticed some synchronized() blocks. What is the reasoning behind this and how do I know when I should be "synchronizing" my code?
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May 28, 2010
I'm developing a GPS tracking software on android. I need IPC to control the service from different activities. So I decide to develop a remote service with AIDL.This wasn't a big problem but now it's always running into the methods of the interface and not into those of my service class. Maybe someone could help me?If i now try to call a method from an activity for example start(trackId) nothing happens. The binding is OK. When debugging it always runs into the startTracking() in the generated ITrackingServiceRemote.java file and not into my TrackingService class. Where is the problem? I can't find anything wrong.
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Feb 16, 2009
I have two packages(Pack1 and Pack2) in same project(Proj) When i created the project (Proj) that time Pack1 was created and R.java was there bydefault.
Now i created Pack2 in same project(Proj) and want to acess some XML files there, but cant access as when i write "R.layout.xxx" that time i don't find any list of xml files there.
Is there any solution to access the XML files across packages
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Oct 8, 2010
I create a javascript function to generate the graph using RGraph.Now i want to send the data for the graph parameters from android java file.For that i want to access the script function in the android java file.Could anyone tell how to do that in android.
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Apr 4, 2010
I am trying to pull data from the internet to make a widget for the home screen.
I have the layout built:
CODE:............
Image downloaded from the internet goes here. Needs to be updated every evening at midnight or unless the button below is pressed. Now if I could only figure out exactly how to do this, life would be good."
CODE:................
Got the provider xml bulit:
CODE:.................
But here is were I am stuck. I just don't know where to start at all. The java is so far beyond my little head that I don't know what to do.
CODE:............
The wiki example just confused me more. I just don't know where to begin.
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Jan 23, 2010
Making a simple app for my android.
in my xml interface there is a text box in which the user will input a number (for example: 10). the id of this text box is "input1"
how do I call the value of input1 in Java and then perform a calculation on it?
For example...
suppose input1 = x
x + 5 or x*2
and for that matter, how do I have the resulting value appear as constantly updated text output in a specified place on the UI?
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Jul 13, 2010
It was a bit baffling (Probably there is a good reason, and it doesnt take much to baffle me)
AlarmManager am; ... PendingIntent pi;
am.set(pi, ...) at 11pm am.set(pi,...) at 2pm
Same "pending intent" with the same intent and request code, in otherwords they resolve to same intent on equals.
Although I know what happens (being the latest one takes precedence), I would have expected my broadcast receiver to be called twice.
I thought something funny is happening in the PendingIntent.
However when I looked at the AlarmManagerService.java I have noticed that the "set.." methods are calling a "remove" using the PendingIntent that is passed in, essentially cancelling the one before.
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Jan 31, 2010
can u tell me how to call a java script method from android activity...
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Oct 30, 2009
I have following problem: I have my "MainActivity". In this Activity, i start a thread (SaxParser in another "normal" java file). Now I want to call a method from the MainActivity out of the normal java file? I have read something of an Application object, but i only find things, where i have to create a new Intent. Is it possible to use the application object in the other "normal" java file like that: Code...
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Oct 15, 2009
JNI problem : from c Languege call Java. i think from c Language call Java, but that CallIntMethod() return value is not equals getIpv6() -> 99, CallIntMethod() its always return strange value is [-1091242504] or [11212] . additional i already solve [Method not found: Code...
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Dec 12, 2009
I have a normal Java application, normally, we start an Android application from a Main Activity, now I must start it from my application.
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Jun 24, 2010
Suppose i have one simple function in my program. Whenever i call that function does a new thread or process is spawned to execute the function or it is executed under the main thread memory space only.
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Mar 9, 2009
1. Can I call ADT Layout Editor in my java source file, not by XML file "open with" menu ?
2. When I click "add" button in the outline view of ADT Layout Editor , it will show such a list of UI components as "AbsoluteLayout AnalogClock AutoCompleteTextView Button ....." My question is where it gets this list? Can I config this path to get my customized UI components?
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Sep 23, 2010
Been trying to call Preferences.java class using:
Intent settingsActivity = new Intent(getBaseContext(), Preferences.class);
startActivity(settingsActivity);
I have this in my Manifest.xml (outside the main app class activity). code...
Any ideas why it's force closing even though I have the Activity defined in the Manifest.xml?
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Oct 26, 2010
I am new at android development and java programming, but I have decided to program a drinking game app in android. This app basically simulates a deck a cards, a player clicks a button to draw a card then based on the card thats drawn the player plays a drinking game (ie takes 1 drink, takes 2 drinks ect).
I have the main program in one java file, and the code that shuffles the card deck and puts the card sequence in an array in other java file. My problem is that whenever a class from the other java file (classicMode.java) is called from the main program (fubar.java), my android program crashes and gives the error : "The application Drinking Game - FUBAR (process com.games.dg) has stopped unexpectedly. Please try again". Code...
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