API 请求：无法在 Android Studio 中工作

Question

每当我尝试 API 请求时：“http://api.openweathermap.org/data/2.5/weather?q=London”
代码无法获取数据。但是，这与其他 URL 一起工作正常。这是主 java 文件。我已经在清单文件中添加了必要的权限。

package thebestone.vicky.jsondemo;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.ExecutionException;

public class MainActivity extends AppCompatActivity {

    class GetData extends AsyncTask<String, Void, String>{

        @Override
        protected String doInBackground(String... strings) {

            String result = "";
            URL url;
            HttpURLConnection urlConnection = null;


            try{

                url = new URL(strings[0]);
                urlConnection = (HttpURLConnection)url.openConnection();
                InputStream in = urlConnection.getInputStream();
                InputStreamReader reader = new InputStreamReader(in);

                int data = reader.read();

                while(data != -1){

                    char ch = (char) data;
                    result = result + ch;
                    data = reader.read();
                }

                return result;

            }catch (Exception e) {
                e.printStackTrace();
                return "Failed";
            }
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);

            Log.i("DATA FETCHED: ", s);
        }
    }

    public void onClick(View view){

        GetData task = new GetData();

        task.execute("http://api.openweathermap.org/data/2.5/weather?q=London");

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


    }
}

logcat:

08-18 19:05:10.478 2380-4307/thebestone.vicky.jsondemo W/System.err: java.io.FileNotFoundException: http://api.openweathermap.org/data/2.5/weather?q=London
08-18 19:05:10.480 2380-4307/thebestone.vicky.jsondemo W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:250)
08-18 19:05:10.480 2380-4307/thebestone.vicky.jsondemo W/System.err:     at thebestone.vicky.jsondemo.MainActivity$GetData.doInBackground(MainActivity.java:33)
08-18 19:05:10.480 2380-4307/thebestone.vicky.jsondemo W/System.err:     at thebestone.vicky.jsondemo.MainActivity$GetData.doInBackground(MainActivity.java:19)
08-18 19:05:10.481 2380-4307/thebestone.vicky.jsondemo W/System.err:     at android.os.AsyncTask.call(AsyncTask.java:305)
08-18 19:05:10.481 2380-4307/thebestone.vicky.jsondemo W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-18 19:05:10.481 2380-4307/thebestone.vicky.jsondemo W/System.err:     at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:243)
08-18 19:05:10.481 2380-4307/thebestone.vicky.jsondemo W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
08-18 19:05:10.481 2380-4307/thebestone.vicky.jsondemo W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
08-18 19:05:10.481 2380-4307/thebestone.vicky.jsondemo W/System.err:     at java.lang.Thread.run(Thread.java:761)
08-18 19:05:10.481 2380-2380/thebestone.vicky.jsondemo I/DATA FETCHED:: Failed

我也无法找出 logcat 和程序中的错误。

如有任何帮助，我们将不胜感激。

Answer 1

我想你也遇到了和我一样的 401 Unauthorized。如果我没记错的话，@Raghunandan 的答案应该是您的解决方案。

API 请求：无法在 Android Studio 中工作

API Request: Not working from Android Studio

java

api

android

openweathermap