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android-通过Asmack发送图像时创建消息

作者:互联网

通过XMPP发送图像时遇到一个问题.下面是我完成的代码片段.我不知道代码有什么问题.

Message msg = new Message(emailId, Message.Type.chat);
            ImageTransferExtension transfer = new ImageTransferExtension();
            transfer.setImageName(mImageUri.getEncodedPath());
            transfer.setUserRecipient(emailId);
            msg.addExtension(transfer);

这是ImagesTransferExtension代码段

编辑:

public class ImageTransferExtension implements PacketExtension {

private String userRecipient;
private String ftpUrl;
private String httpUrl;
private String id;
private String typeOfMessage;
private String fieldName;
private String duration;

@Override
public String getElementName() {
    // TODO Auto-generated method stub
    return "x";
}

@Override
public String getNamespace() {
    // TODO Auto-generated method stub
    return "jabber:client";
}

@Override
public String toXML() {
    StringBuilder builder = new StringBuilder();
    builder.append("<" + getElementName() + " xmlns=\"" + getNamespace()
            + "\">");
    if (ftpUrl != null) {
        builder.append("<ftpUrl>").append(ftpUrl).append("</ftpUrl>");
    }
    if (httpUrl != null) {
        builder.append("<httpUrl>").append(httpUrl).append("</httpUrl>");
    }
    if (typeOfMessage != null) {
        builder.append("<typeOfMessage>").append(typeOfMessage)
                .append("</typeOfMessage>");
    }
    if (fieldName != null) {
        builder.append("<fieldName>").append(fieldName)
                .append("</fieldName>");
    }
    if (duration != null) {
        builder.append("<duration>").append(duration).append("</duration>");
    }
    builder.append("</" + getElementName() + ">");

    return builder.toString();
}

public String getUserRecipient() {
    return userRecipient;
}

public void setUserRecipient(String userRecipient) {
    this.userRecipient = userRecipient;
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

}

我不知道在命名空间和元素中传递什么.我浏览了该文档,但没有找到解决方案.

解决方法:

您可以为自定义数据包使用任何名称和名称空间,但是传出数据包的XML流应该是有效且格式正确的XML文档.
在您的示例中,我看到了未绑定的ftpurl,httpurl,imageName节点.任何好的XML / XMPP解析器都将引发错误,因为流的格式不正确.常见做法是-将所有自定义节点包装在一个顶级节点中并定义名称空间,如下所示:

<i xmlns="my:image:transfer">
 <httpurl>http://my.image.jpg</httpurl>
 <ftpurl>ftp://my/image.jpg</ftpurl>
</i>

这将导致XML解析器对待所有自定义XML节点,因为它们来自“ my:image:transfer”命名空间,并且XML流将有效.

在“图像传输扩展名”的上下文中,您正在尝试重新发明“带外” XMPP文件传输,它具有著名的XMPP扩展名-http://xmpp.org/extensions/xep-0066.html

具有OOB扩展名的数据包如下所示:

<message from='stpeter@jabber.org/work'
         to='MaineBoy@jabber.org/home'>
  <body>Yeah, but do you have a license to Jabber?</body>
  <x xmlns='jabber:x:oob'>
    <url>http://www.jabber.org/images/psa-license.jpg</url>
    <desc>Jabber license</desc>
  </x>
</message>

这种有效负载的Smack PacketExtension应该看起来像:

public class OutOfBandData implements PacketExtension {

    String description;
    String url;

    @Override
    public String getElementName() {
        return "x";
    }

    @Override
    public String getNamespace() {
        return "jabber:x:oob";
    }

    @Override
    public String toXML() {
    StringBuilder builder = new StringBuilder();
    builder.("<" + getElementName() + " xmlns=\"" + getNamespace() + "\">");
    if (url != null) {
        builder.append("<url>").append(url).append("</url>");
    }
    if (description != null) {
        builder.append("<desc>").append(description).append("</desc>");
    }
    builder.append("</" + getElementName() + ">");
    return builder.toString();
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String imageUrl) {
        this.url = imageUrl;
    }

这离您的实现不远,但是其他XMPP客户端理解您的“图像传输”的机会正在增加.

标签:asmack,android,xmpp
来源: https://codeday.me/bug/20191013/1910553.html