Question

我是android studio中的新手，我正在努力让我的简单应用程序使用Volley从URL获取JSON数据，一切都很好，但我想做自动刷新数据json .am尝试做但不工作。

我的代码，如果有人可以帮助我

package imo.meteoiraq;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.json.JSONException;
import org.json.JSONObject;

import java.security.Timestamp;

public class MainActivity extends AppCompatActivity {
RequestQueue rq;
TextView timeDesc,tempDesc,windspeedDesc,windguestDesc,humdityDesc;
    int ages;
    int temp;
    int windspeed;
    int windguest;
    int humdity;
    long timeupdate;

    String url="/stationlookup?station=I1410&units=metric&v=2.0&format=json";
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rq= Volley.newRequestQueue(this);

        timeDesc= (TextView) findViewById(R.id.timeupdateDesc);
        tempDesc= (TextView) findViewById(R.id.tempid);
        windspeedDesc= (TextView) findViewById(R.id.windid);
        windguestDesc= (TextView) findViewById(R.id.windgustid);
        humdityDesc= (TextView) findViewById(R.id.humdid);

        sendjsonrequest();
    }
public void  sendjsonrequest(){
    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            try {

                JSONObject stationsJO = response.getJSONObject("stations");
                JSONObject I1410JO = stationsJO.getJSONObject("I1410");
                 temp = I1410JO.getInt("temperature");
                 windspeed = I1410JO.getInt("wind_speed");
                 windguest = I1410JO.getInt("wind_gust_speed");
                 humdity = I1410JO.getInt("humidity");
                timeupdate = I1410JO.getLong("updated")* 1000L;

                 tempDesc.setText(Integer.toString(temp));
                 windspeedDesc.setText(Integer.toString(windspeed));
                 windguestDesc.setText(Integer.toString(windguest));
                 humdityDesc.setText(Integer.toString(humdity));
                 timeDesc.setText(getDate(timeupdate));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }
    });
    rq.add(jsonObjectRequest);
}

    private String getDate(long  timeStamp){
        try{
            DateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss");
            Date netDate = (new Date(timeStamp));
            return sdf.format(netDate);
        }
        catch(Exception ex){
            return "xx";
        }
    }
}

Answer 1

您可以使用Handler来执行此操作。例如 `

scope.gridOptions.data = scope.data;
if (scope.data.length > 10) {
        scope.gridOptions.minRowsToShow = 10;
      } else {
        scope.gridOptions.minRowsToShow = scope.data.length;
      }
   scope.gridOptions.virtualizationThreshold =scope.gridOptions.minRowsToShow;

Answer 2

使用此：

GPS

希望这有帮助!!!

android studio，自动刷新数据json url每60秒

2 个答案: