Android从onenet上获取数据

onenet平台上：

设备信息：主要是设备id和APIKey这两个参数

数据流信息：

其中一个数据流的名称：shumditity

最新一个数据：

参考：https://www.arduino.cn/thread-47375-1-2.html

所有数据流的最新一个数据：

"http://api.heclouds.com/devices/36427574/datapoints"

一个数据流中所有数据（指定获取的开始时间）：

"http://api.heclouds.com/devices/36427574/datapoints?datastream_id=command1&start=2018-10-12T17:22:33"

虽然指定了时间，但是只能显示100条。可以用limit=120来显示（limit：参与运算的数据点最大数量，默认6000，最大6000）：

"http://api.heclouds.com/devices/*****/datapoints?datastream_id=temperature&start=2018-10-12T17:22:33&limit=120”

代码： 

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.io.IOException;
import java.util.List;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends Activity {
  
    private static final String DeviceID = "36326052";
    private static final String ApiKey = "A1RUKhwKwfTGf0gKhY6bHOz4DOw="; 
    private static final String shumditity="shumditity";//onenet平台上对应设备的其中一个数据流的名字
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Get();

    }

    public void Get() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    OkHttpClient client = new OkHttpClient();
                    Request request = new Request.Builder().url("http://api.heclouds.com/devices/" + DeviceID + "/datapoints?datastream_id=" + shumditity).header("api-key", ApiKey).build();
                    Response response = client.newCall(request).execute();
                    String responseData = response.body().string();
                 
                    parseJSONWithGSON(responseData);

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }


    private void parseJSONWithGSON(String jsonData) {
        JsonRootBean app = new Gson().fromJson(jsonData, JsonRootBean.class);
        List streams = app.getData().getDatastreams();
        List points = streams.get(0).getDatapoints();
        int count = app.getData().getCount();//获取数据的数量
        for (int i = 0; i < points.size(); i++) {
            String time = points.get(i).getAt();
            String value = points.get(i).getValue();
            Log.w("www","time="+time);
            Log.w("www","value="+value);
        }
        
    }

}

打印结果：

在build.gradle中增加：

    compile 'com.squareup.okhttp3:okhttp:3.4.1'
    compile 'com.google.code.gson:gson:2.7'

在AndroidManifest.xml中添加：

json解析：

json 在线转换工具：http://www.bejson.com/

public class JsonRootBean {
    private int errno;
    private Data data;
    private String error;
    public void setErrno(int errno) {
        this.errno = errno;
    }
    public int getErrno() {
        return errno;
    }

    public void setData(Data data) {
        this.data = data;
    }
    public Data getData() {
        return data;
    }

    public void setError(String error) {
        this.error = error;
    }
    public String getError() {
        return error;
    }

}

public class Data {
    private int count;
    private List datastreams;
    public void setCount(int count) {
        this.count = count;
    }
    public int getCount() {
        return count;
    }

    public void setDatastreams(List datastreams) {
        this.datastreams = datastreams;
    }
    public List getDatastreams() {
        return datastreams;
    }


}

public class Datapoints {
    private String at;
    private String value;


    public void setValue(String value) {
        this.value = value;
    }

    public String getAt() {
        return at;
    }

    public void setAt(String at) {
        this.at = at;
    }

    public String getValue() {
        return value;
    }

}

public class Datastreams {
    private List datapoints;
    private String id;
    public void setDatapoints(List datapoints) {
        this.datapoints = datapoints;
    }
    public List getDatapoints() {
        return datapoints;
    }

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


}