java - API の JSON 形式からテキストを取得しました。Android アプリで同じ API から画像を追加したいと考えています。

Question

私はアンドロイドが初めてで、JSON 形式の API からリアルタイムのテキストと画像を更新するのが難しいと感じています。リストビューにテキストを正常に追加しました。次に、その横に画像を追加したいと思います。前もって感謝します。

MainActivity.java ファイル

package com.example.android.samplelayout;

import android.media.Image;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter; 
import android.widget.Toast;
import android.net.Uri;
import android.graphics.drawable.Drawable;

import org.json.JSONArray;
import org.json.JSONException;
 import org.json.JSONObject;

import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity {

private String TAG = MainActivity.class.getSimpleName();
private ListView lv;

ArrayList<HashMap<String, String>> contactList;

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

    contactList = new ArrayList<>();
    lv = (ListView) findViewById(R.id.list);

    new GetContacts().execute();
}

private class GetContacts extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Toast.makeText(MainActivity.this,"Json Data is downloading",Toast.LENGTH_LONG).show();

    }

    @Override
    protected Void doInBackground(Void... arg0) {
        HttpHandler sh = new HttpHandler();
        // Making a request to url and getting response
        String url = "http://webhose.io/search?token=9c55cbb1-2f1c-4700-9c1e-67e685152506&format=json&q=Indian%20Startup";
        String jsonStr = sh.makeServiceCall(url);

        Log.e(TAG, "Response from url: " + jsonStr);
        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);
                // Getting JSON Array node
                //JSONObject responseObject = jsonObj.getJSONObject("response");
                JSONArray responseArray = jsonObj.getJSONArray("posts");
                // looping through All Contacts
                for (int i = 0; i < responseArray.length(); i++) {


                    JSONObject firstObject = responseArray.getJSONObject(i);
                    //JSONObject titleObject = firstObject.getJSONObject("title");
                    // Extract out the title, time, and tsunami values

                    //String image = firstObject.getString("main_image");
                    String title = firstObject.getString("title");

                    // tmp hash map for single contact
                    HashMap<String , String> contact = new HashMap<>();

                    // adding each child node to HashMap key => value
                    //contact.put("pic", image);
                    contact.put("name", title);

                    // adding contact to contact list
                    contactList.add(contact);
                }
            } catch (final JSONException e) {
                Log.e(TAG, "Json parsing error: " + e.getMessage());
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Json parsing error: " + e.getMessage(),
                                Toast.LENGTH_LONG).show();
                    }
                });

            }

        } else {
            Log.e(TAG, "Couldn't get json from server.");
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(),
                            "Couldn't get json from server. Check LogCat for possible errors!",
                            Toast.LENGTH_LONG).show();
                }
            });
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        ListAdapter adapter = new SimpleAdapter(MainActivity.this, contactList,R.layout.list_item, new String[]{"name"}, new int[]{ R.id.name});
        lv.setAdapter(adapter);
    }
}



}

HttpHandler.java ファイル

package com.example.android.samplelayout;

import android.util.Log;

import java.io.BufferedInputStream; 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

public class HttpHandler {

private static final String TAG = HttpHandler.class.getSimpleName();

public HttpHandler() {
}

public String makeServiceCall(String reqUrl) {
    String response = null;
    try {
        URL url = new URL(reqUrl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        // read the response
        InputStream in = new BufferedInputStream(conn.getInputStream());
        response = convertStreamToString(in);
    } catch (MalformedURLException e) {
        Log.e(TAG, "MalformedURLException: " + e.getMessage());
    } catch (ProtocolException e) {
        Log.e(TAG, "ProtocolException: " + e.getMessage());
    } catch (IOException e) {
        Log.e(TAG, "IOException: " + e.getMessage());
    } catch (Exception e) {
        Log.e(TAG, "Exception: " + e.getMessage());
    }
    return response;
}

private String convertStreamToString(InputStream is) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();

    String line;
    try {
        while ((line = reader.readLine()) != null) {
            sb.append(line).append('\n');
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return sb.toString();
}
}