signature get error on Alljoyn framework?

Question

i'm working Android App use Alljoyn framework and i have some prolem

i have a custom object

public class Package implements BusObject {


    public static enum DataSendType {
        TEXT,IMAGE
    }

    public static enum PackageStatus {
        NONE, SENDING, DONE
    }

    @Signature("s")
    private String m_id;
    @Signature("a")
    private ArrayList<DataPackage> m_listPackage;
    @Signature("r")
    private PackageStatus m_status;
    @Signature("r")
    private DataSendType m_type;
    @Signature("s")
    private String m_packageName;
}

and interface

@BusInterface (name="xxxx.simpleinterface")
public interface SimpleInterface {

    @BusSignal (name="Chat", signature="o")
    public void Chat(Package message) throws BusException;
}

but i get this error cannot marshal class Package into 'o' when use Chat(Package)..

pls help me, because i can't get this error out for 2 weeks.

sorry because my English is too bad :)

What are you trying to send as part of the signal is it a struct with an id string, array of bytes, enum status, enum sendtype, string? most importantly what is the m_listPackage? — gnash117, Sep 03 '13 at 22:57

score 0 · Accepted Answer · answered Sep 17 '13 at 16:51

looking at your code it looks like what you are trying to send is a struct the signature for a struct should be "r" or the actual signature surrounded by parenthesizes ( and ). i.e. for Package the signature would be "(sayiis)"

With AllJoyn you can send an array but not an ArrayList and you must specify the type of data that is in the array.
Since your DataSendType specified TEXT or IMAGE I made the assumption that you want to send an array of bytes.
Most of the items I did not add a signature to because AllJoyn can figure out the signature using reflection. AllJoyn however does not know that enums will be transmitted as integers so I did have to specify the signature for the enums.
Package did not have to implement BusObject. In your code when you implement your SimpleInterface that should extend the SimpleInterface and `BusObject'

Anything sent using AllJoyn should be public so the interface can read the member variables.

public class Package {
    public static enum DataSendType{
        TEXT,
        IMAGE
    }

    public static enum PackageStatus {
        NONE,
        SENDING,
        DONE
    }

    @Position(0)
    public String m_id;
    @Position(1)
    public byte[] m_listPackage;
    @Position(2)
    @Signature("i")
    public PackageStatus m_status;
    @Position(3)
    @Signature("i")
    public DataSendType m_type;
    @Position(4)
    public String m_packageName;
}

for the interface the signature should be "r" for struct the signature "o" means object path. This is an AllJoyn object path which means it just a string with path data.

@BusInterface (name="xxxx.simpleinterface")
public interface SimpleInterface {

    @BusSignal (name="Chat", signature="r")
    public void Chat(Package message) throws BusException;
}

If you really need to use an ArrayList convert the ArrayList to an actual array before sending the Chat signal.

signature get error on Alljoyn framework?

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