Question

我遇到了Android应用程序的问题。我要做的是从JSON API解析数据，然后使用ListActivity将收集的数据放入多行列表中。但是，我似乎无法让它工作。我已经尝试过Googeling的解决方案，但我找不到任何人使用与我相同的方法。

任何可以向我解释如何让它发挥作用的人？

PubsActivity.java：

public class PubsActivity extends ListActivity implements OnItemClickListener, MyCallbackInterface{

private static String url = "http://api.fatkoll.se/json/1.0/getPlaces.json?api_key=fd6950b1499b71037ec3c5a5e01081d6&city_id=";


static String TAG_LIST = "list";
static String TAG_ID = "id";
static String TAG_NAME = "name";
static String TAG_ADDRESS = "address";
static String TAG_OPEN_HOURS = "openhours";
static String TAG_LAT = "lat";
static String TAG_LNG = "lng";

private static String address;
private static String openhours;
private static String lat;
private static String lng;

private ArrayList<String> info = new ArrayList<String>();
int[] toId = new int[] {R.id.listName ,R.id.listAddress};
private ArrayList<String> pubIds = new ArrayList<String>();

JSONArray list = null;

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

    Intent getCityId = getIntent();
    String cityId = getCityId.getExtras().getString("cityId");

    JSONparser parser = new JSONparser(this);       
    parser.execute(url);

}



@Override
public void onRequestComplete(JSONObject result) {

    JSONObject json = result;

    try {

        list = json.getJSONArray(TAG_LIST);
        Log.e("onRequestComplete", "Fått JSONArray");


        for (int i = 0; i < list.length(); i++){
            JSONObject c = list.getJSONObject(i);
            Log.e("onRequestComplete", list.getString(i));
            pubIds.add(c.getString(TAG_ID));
            info.add(c.getString(TAG_NAME));
            info.add(c.getString(TAG_ADDRESS));
            openhours = c.getString(TAG_OPEN_HOURS);
            lat = c.getString(TAG_LAT);
            lng = c.getString(TAG_LNG);

        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, info);
    Log.e("onRequestComplete", "Skapar ArrayAdapter");
    setListAdapter(adapter);
    Log.e("onRequestComplete", "Sätter ListAdapter");
    ListView lv = getListView();
    lv.setOnItemClickListener(this);

JSONparser.java：

package se.mima.jeda.frsa.krogrunda;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.util.Log;

public class JSONparser extends AsyncTask<String, Void, JSONObject> {

// Initializing variables

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

public interface MyCallbackInterface {
    public void onRequestComplete(JSONObject result);
}

private MyCallbackInterface mCallback;

public JSONparser(MyCallbackInterface callback) {
    mCallback = callback;
}

public JSONObject getJSONFromUrl(String url) {

    // Make a HTTP request
    try {
        // Creating a DefaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        // skapar en HttpPost
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();

        // Catching exceptions
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    // BufferedReader reads the data gathered from the API
    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8000);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // Trying to parse a JSONObject from a String
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // Return JSONObject
    return jObj;
}

@Override
protected JSONObject doInBackground(String... params) {
    String url = params[0];
    return getJSONFromUrl(url);
}

@Override
protected void onPostExecute(JSONObject result) {
    mCallback.onRequestComplete(result);
}

}

Answer 1

我认为您应该使用自己的BaseAdapter（请参阅此处的Google示例List 14）获取您的数据。目前，您在列表中交替显示每个列表条目的“名称”和“地址”，因为您将此数据存储到一个ArrayList中。使用BaseAdapter，您可以将自己的自定义数据对象放入列表适配器，并且可以自由地将其显示在列表中。

多行ListAdapter，使用ListActivity

1 个答案: