在 Retrofit Android 中获取响应

Question

I'm new to learning ROS and retrofit. Can anyone help me or point out why its causing me this error, basically I want to get the name and status under the hardware json. I'm not sure if my error is coming from my POJO model.

Answer 1

In your ObjectList`, create a getter to get string from hardware array:

public String getHardwareString() {
    String result = "";
    for (int i=0; i<hardware.length; i++) {
        Object item = hardware[i];
        result += item.name
    }
    return result;
}

Change the result concatenation corresponding with your requirement.

In your fragment:

textviewhardware.setText(response.body().getHardwareString());

Answer 2

E/ mainAction: response com.nera.rosbridgeclient.messages.robot_msgs.ObjectList@cea25bf hardware[Lcom.nera.rosbridgeclient.messages.robot_msgs.Object;@7ec748c

This is not an Error/Exception , it's your Log message .

Log.e(" mainAction", " hardware"+ response.body().getHardware().toString());

The above line generates that error logs .

Cause:

response.body().getHardware()`

The above line will return you an array of Hardware . Means an instance/object of a hardware array .

So when you use toString() to an instance/object like

response.body().getHardware().toString()

It will give you the instance as String .

Solution:

You are getting an Array of Hardware in response. So you have to iterate it like the following.

@Override
public void onResponse(Call<ObjectList> call, Response<ObjectList> response) {
       StringBuilder sb = new StringBuilder(); // add this line

       for(int i=0; i<response.body().getHardware().length; i++){
           Log.e(" mainAction", "  hardware"+ response.body().getHardware()[i].name);

           sb.append(response.body().getHardware()[i].name)); // here we append each hardware name to our string builder.
           sb.append(" "); // here we append a space separator after every hardware name, you can use whatever you want(like: newline[\n] or coma[,]).
       }
       textviewhardware.setText(sb.toString()); // now textview will show every hardware name.
}