Android的Web服務調用每秒

Question

我掙扎着一個嚴重的問題

我想調用異步函數返回我JSON對象和更新我的UI （如果必要）每秒喜歡的setInterval。

一個電話我成功（以下工作100％的代碼） 但我想，它是每秒執行一次

我附上我的活動類和asyncRequest類

public class AsyncRequest extends AsyncTask<String, Integer, String> { 

OnAsyncRequestComplete caller; 
Context context; 
String method = "GET"; 
List<NameValuePair> parameters = null; 
ProgressDialog pDialog = null; 

String label=""; 
// Three Constructors 
public AsyncRequest(Activity a, String m, List<NameValuePair> p) { 
    caller = (OnAsyncRequestComplete) a; 
    context = a; 
    method = m; 
    parameters = p; 
} 

public AsyncRequest(Activity a, String m) { 
    caller = (OnAsyncRequestComplete) a; 
    context = a; 
    method = m; 
} 

public AsyncRequest(Activity a) { 
    caller = (OnAsyncRequestComplete) a; 
    context = a; 
} 

public AsyncRequest(Activity a, String m, List<NameValuePair> p, String l) { 
     caller = (OnAsyncRequestComplete) a; 
     context = a; 
     method = m; 
     parameters = p; 
     label = l; 
    } 

// Interface to be implemented by calling activity 
public interface OnAsyncRequestComplete { 
    public void asyncResponse(String response); 
} 

public String doInBackground(String... urls) { 
    // get url pointing to entry point of API 
    String address = urls[0].toString(); 
    if (method == "POST") { 
    return post(address); 
    } 

    if (method == "GET") { 
    return get(address); 
    } 

    return null; 
} 

public void onPreExecute() { 
    pDialog = new ProgressDialog(context); 
    pDialog.setMessage("Loading data.."); // typically you will define such 
      // strings in a remote file. 
    pDialog.show(); 
} 

public void onProgressUpdate(Integer... progress) { 
    // you can implement some progressBar and update it in this record 
    // setProgressPercent(progress[0]); 
} 

public void onPostExecute(String response) { 
    if (pDialog != null && pDialog.isShowing()) { 
    pDialog.dismiss(); 
    } 
    caller.asyncResponse(response); 
} 

protected void onCancelled(String response) { 
    if (pDialog != null && pDialog.isShowing()) { 
    pDialog.dismiss(); 
    } 
    caller.asyncResponse(response); 
} 

@SuppressWarnings("deprecation") 
private String get(String address) { 
    try { 

    if (parameters != null) { 

    String query = ""; 
    String EQ = "="; String AMP = "&"; 
    for (NameValuePair param : parameters) { 
    query += param.getName() + EQ + URLEncoder.encode(param.getValue()) + AMP; 
    } 

    if (query != "") { 
    address += "?" + query; 
    } 
    } 

    HttpClient client = new DefaultHttpClient(); 
    HttpGet get= new HttpGet(address); 

    HttpResponse response = client.execute(get); 
    return stringifyResponse(response); 

    } catch (ClientProtocolException e) { 
    // TODO Auto-generated catch block 
    } catch (IOException e) { 
    // TODO Auto-generated catch block 
    } 

    return null; 
} 

private String post(String address) { 
    try { 

    HttpClient client = new DefaultHttpClient(); 
    HttpPost post = new HttpPost(address); 

    if (parameters != null) { 
    post.setEntity(new UrlEncodedFormEntity(parameters)); 
    } 

    HttpResponse response = client.execute(post); 
    return stringifyResponse(response); 

    } catch (ClientProtocolException e) { 
    // TODO Auto-generated catch block 
    } catch (IOException e) { 
    // TODO Auto-generated catch block 
    } 

    return null; 
} 

private String stringifyResponse(HttpResponse response) { 
    BufferedReader in; 
    try { 
    in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); 

    StringBuffer sb = new StringBuffer(""); 
    String line = ""; 
    while ((line = in.readLine()) != null) { 
    sb.append(line); 
    } 
    in.close(); 

    return sb.toString(); 
    } catch (IllegalStateException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
    } catch (IOException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
    } 

    return null; 
} 
} 

，我的主要活動

public class MainActivity extends Activity implements 
    AsyncRequest.OnAsyncRequestComplete { 

TextView titlesView; 
String apiURL = "url that return json"; 
ArrayList<NameValuePair> params; 

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

    // TODO Auto-generated method stub 
    titlesView = (TextView) findViewById(R.id.post_titles); 
    params = getParams(); 
    AsyncRequest getPosts = new AsyncRequest(this, "GET", params); 
    getPosts.execute(apiURL); 
} 

// override method from AsyncRequest.OnAsyncRequestComplete interface 
// the response can contain other parameters specifying if the request was 
// successful or not and other things 
// in a real world application various checks will be done on the response 
@Override 
public void asyncResponse(String response) { 

    try { 
    // create a JSON array from the response string 
    //JSONArray objects = new JSONArray(response); 

     JSONObject json = new JSONObject(response); 

     String str = ""; 
     JSONArray articles = json.getJSONArray("GetTrainStationsResult"); 

    // define a string to hold out titles (in a real word application you will be using a ListView and an Adapter to do such listing) 
    String titles = ""; 
    String NL = "\n"; 
    String DOT = ". "; 
    for (int i = 0; i < articles.length(); i++) { 
    JSONObject object = (JSONObject) articles.getJSONObject(i); 
    titles += object.getString("Description") + DOT + object.getString("LocationLat") + NL; 
    } 
    titlesView.setText(titles); 
    } catch (JSONException e) { 
    e.printStackTrace(); 
    } 
} 

// here you specify and return a list of parameter/value pairs supported by 
// the API 
private ArrayList<NameValuePair> getParams() { 
    // define and ArrayList whose elements are of type NameValuePair 
    ArrayList<NameValuePair> params = new ArrayList<NameValuePair>(); 
    params.add(new BasicNameValuePair("start", "0")); 
    params.add(new BasicNameValuePair("limit", "10")); 
    params.add(new BasicNameValuePair("fields", "id,title")); 
    return params; 
} 

} 

將不勝感激幫助 感謝

Answer 1

AlarmManager可以成爲您正在尋找的解決方案。 還有像你的另一個問題，所以看看here