Communicate between Android and ROS threads

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Hello,

I have a simple Java class that launch a thread containing a ROS node

public class ROSThread implements Runnable {
private Thread m_thread;

public ROSThread() {
    this.m_thread = new Thread(this);
}

public void rosrun(){
    m_thread.start();
}

@Override
public void run() {
    // start your classic ROS node (spin()) in a dedicated thread
    startROSNode();
}

//load C/C++ shared library
static
{
    System.loadLibrary("ros_main");
}
private native void startROSNode();
}

Which is launched in the Activity class

ROSThread rosThread = new ROSThread();
rosThread.rosrun();

In this activity, I would like to indicate to my ROS nod that it needs to publish something. Any idea how to do that ?

Thanks in advance,