如何通过AsyncTask的方法来解析来自2个不同的网址数据 [英] How to parse data from 2 different URLs by asyncTask method
本文介绍了如何通过AsyncTask的方法来解析来自2个不同的网址数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个应用程序从一个JSON URL获取数据。它完美地使用同一个URL，但我需要在同一时间获得来自两个JSON的URL数据。就像从一个URL和一些来自其他的部分数据。并显示他们两个textViews。
I have an app that get data from a JSON URL. It works perfectly with one URL, but I need to get data from two JSON URLs at the same time. Like some data from one URL and some from the other one. And show them in two textViews.
下面是我的应用程序，它目前不加载任何数据。
Here is my app, it does not load any data currently.
MainActivity：
public class MainActivity extends Activity {
//URL to get JSON Array
private static String url1 = "http://api.worldbank.org/countries/de?format=json";
private static String url2 = "http://api.worldbank.org/countries/it?format=json";
//JSON Node Names
private static final String CountryNAME1 = "name";
private static final String CountryNAME2 = "name";
JSONArray user = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new GetJSONTask().execute(url1);
//new GETJSONTask().execute(url2);
}
class GetJSONTask extends AsyncTask<String, Void, JSONObject> {
protected JSONObject doInBackground(String... urls) {
// Creating new JSON Parser
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json1 = jParser.getJSONFromUrl(url1);
JSONObject json2 = jParser.getJSONFromUrl(url2);
return json1;
}
protected void onPostExecute(JSONObject json1, JSONObject json2) {
//Getting JSON Array
try {
//For Country 1
// Get the array
JSONArray countryArC1 = json1.getJSONArray("myValues");
JSONObject countryObC1 = countryArC1.getJSONObject(0);
JSONArray countryAr2C1 = countryArC1.getJSONArray(1);
JSONObject countryOb2C1 = countryAr2C1.getJSONObject(0);
//For Country 2
// Get the array
JSONArray countryArC2 = json2.getJSONArray("myValues");
JSONObject countryObC2 = countryArC2.getJSONObject(0);
JSONArray countryAr2C2 = countryArC2.getJSONArray(1);
JSONObject countryOb2C2 = countryAr2C2.getJSONObject(0);
//Storing JSON item in a Variable
String name1 = countryOb2C1.getString(CountryNAME1);
String name2 = countryOb2C2.getString(CountryNAME2);
//Importing TextView
final TextView textView1 = (TextView)findViewById(R.id.url1);
final TextView textView2 = (TextView)findViewById(R.id.url2);
//Set JSON Data in TextView
textView1.setText(name1);
textView2.setText(name2);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
JSONParser：
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
//System.out.println("url getJSONfromUrl " + url);
//url = "http://api.worldbank.org/countries/CA/indicators/SP.POP.TOTL?date=1980:1981&format=json";
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
System.out.println("JSONParser string: " + json);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
if (json.startsWith("[")) {
// We have a JSONArray
try {
jObj = new JSONObject();
jObj.put("data", new JSONArray(json));
} catch (JSONException e) {
Log.d("JSON Parser", "Error parsing JSONArray " + e.toString());
}
return jObj;
}
// try parse the string to a JSON object
/*try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}*/
// return JSON String
return jObj;
}
}
XML：
<TextView
android:id="@+id/url1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/url2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/url1"
android:layout_marginTop="104dp"
/>
我觉得主要的问题是新GetJSONTask（）执行（URL1）; 和的JSONObject json1 = jParser.getJSONFromUrl（URL1）; 正如我不能拥有2 GetJSONTASKs，并在同一时间也着回报json1和json2。
I think the main problem is new GetJSONTask().execute(url1); and JSONObject json1 = jParser.getJSONFromUrl(url1); As I cant have 2 GetJSONTASKs and also cant return json1 and json2 at the same time.
任何想法？
推荐答案
我建议你改变你的方法
class GetJSONTask extends AsyncTask<String, Void, JSONObject[]> {
...
protected JSONObject[] doInBackground(String... urls) {
// Creating new JSON Parser
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject[] jsons = new JSONObject[2];
jsons[0] = jParser.getJSONFromUrl(url1);
jsons[1] = jParser.getJSONFromUrl(url2);
return jsons;
}
protected void onPostExecute(JSONObject[] jsons) {
JSONObject json1 = jsons[0];
JSONObject json2 = jsons[1];
// do you work after this
}
}
希望这有助于！
这篇关于如何通过AsyncTask的方法来解析来自2个不同的网址数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
