Implement custom message in Android Studio

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Hello,

at the moment I am developing an Android application that publishes data into a ROS environment. For this, I use rosandroid-core which is included with Maven from the following repository: https://github.com/rosjava/rosjava_mvn_repo.

By commands like

compile 'org.ros.rosjava_messages:std_msgs:0.5.11'

I am able to generate all standard messages that are defined in the repository. The String-message is defined like the following:

package std_msgs;

import org.ros.internal.message.Message;

public interface String extends Message {

public static final String _DEFINITION = "string data\n";

public static final String _TYPE = "std_msgs/String";

String getData();

void setData(String str);

}

Now I want to create my own message type. So I created a Java interfaces that extends the org.ros.internal.message.Message class.

When I initalize a message from the custom type in the code, everything is fine. But as soon as I want to publish a message from this custom message type, I get a NoClassFoundException.

Do you know where the error is? How can I include the compilation of my custom message type in the Gradle file?

Thanks and best regards.