Android中的AsyncTask

Question

我有一個客戶端類，連接到服務器併發送POST請求，並作爲響應獲取Json答案。

public class ClientLocal extends AsyncTask<Void, Void, String> { 

private static final MediaType JSON = MediaType.parse("application/json;charset=utf-8"); //Media type for request 


public JSONObject all_info_json; 

private String page; 

private SharedPreferences prefs; 

private String login; 
private String pass; 
private StringBuilder request_body = new StringBuilder(); 
private OkHttpClient client = new OkHttpClient(); 

protected String doInBackground(Void... params) { 
    RequestBody body = RequestBody.create(JSON, request_body.toString()); 
    Request request = new Request.Builder() 
      .url("https://program.yousystem.com.ua/frontend/api/user/login") 
      .post(body) 
      .build(); 
    try (Response response = client.newCall(request).execute()) { 
     page = response.body().string(); 
     //Log.i("PAGE", "page from try" + page); 
     return page; 

    } catch (IOException e) { 
     Log.i("ERROR", "1" + e.toString()); 
     e.printStackTrace(); 
     return null; 
    } 

} 


protected void onPostExecute(String page) { 

    try { 
     all_info_json = (JSONObject) new JSONTokener(page).nextValue(); 

     JSONObject response = all_info_json.getJSONObject("response"); 
     Log.i("PAGE", "RESP" + response.toString()); 

     String token = response.getString("token"); 
     Log.i("PAGE", "TOKEN " + token); 

     JSONObject profile = response.getJSONObject("profile"); 
     Log.i("PAGE", "PROFILE" + profile.toString()); 

     JSONArray balances = profile.getJSONArray("balances"); 
     JSONObject balance_obj = balances.getJSONObject(0); 
     String balance = balance_obj.getString("balance"); 
     Log.i("PAGE", "Balance" + balance); 

     JSONObject person = profile.getJSONObject("person"); 
     String firstName = person.getString("firstName"); 
     String lastName = person.getString("lastName"); 
     String mobile = person.getString("mobile"); 
     String email = person.getString("email"); 

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

    // Log.i("PAGE", "page from post" + page); 

} 

ClientLocal(String login, String pass) { 
    this.login = login; 
    this.pass = pass; 
    this.request_body.append("{username: \""); 
    this.request_body.append(login); 
    this.request_body.append("\", pass: \""); 
    this.request_body.append(pass); 
    this.request_body.append("\", lng: \"ua\", prgCode: \"prg1\"}\""); 
    Log.i("", "page constructor" + request_body.toString()); 

}} 

我需要使用AsyncTask在一個客戶端類中執行所有請求，任何人都可以幫助我，如何做到這一點？因爲要運行一個請求我使用ClientLocal client = new ClientLocal("login","pass");之後client.execute(); 在我看來，我需要創建Request builder類。但是如何在客戶端使用它呢？

public class RequestBuilder { 

final private static String login_string = "https://program.yousystem.com.ua/frontend/api/user/login"; 
final private static String about_me = "https://program.yousystem.com.ua/frontend/api/user/me"; 
final private static String about_me_edit = "https://program.yousystem.com.ua/frontend/api/user/save"; 
final private static String transaction_list = "https://program.yousystem.com.ua/frontend/api/transaction/list"; 

String card_number; 
String password; 

StringBuilder request_body_login = new StringBuilder(); 

public RequestBuilder(String card_number_, String password_) { 
    this.card_number = card_number_; 
    this.password = password_; 
} 

public String LoginRequest(){ 

    this.request_body_login.append("{username: \""); 
    this.request_body_login.append(card_number); 
    this.request_body_login.append("\", pass: \""); 
    this.request_body_login.append(password); 
    this.request_body_login.append("\", lng: \"ua\", prgCode: \"prg1\"}\""); 
    Log.i("", "page constructor" + request_body_login.toString()); 
    return request_body_login.toString(); 
}} 

登錄請求

Post https://program.yousystem.com.ua/frontend/api/user/login 
Request { 
    "username": "username", 
    "pass": "pass", 
    "lng": "ua", 
    "prgCode": "prg1" 
} 

獲取資料信息

Post https://program.yousystem.com.ua/frontend/api/user/me 
Request { 
    "prgCode": "prg1", 
    "token": "XT4PHNZBMSK73C7KH33NDJCN8A4SP5CJ" 
} 

交易清單

Post https://program.yousystem.com.ua/frontend/api/transaction/list 
Request { 
    "withLimit": true, 
    "prgCode": "prg1", 
    "token": "XT4PHNZBMSK73C7KH33NDJCN8A4SP5CJ" 
} 

Answer 1

你可以有每個請求

的方法的類

public class MyRequests{ 
    private jsonParser; 
    public MyRequests(){ 
    jsonParser = new JSONParser() 

    } 
    //request login 
    public JSONObject loginRequest(String username,String password, String prgCode, String language){ 
    // Building Parameters 
    List<NameValuePair> params = new ArrayList<NameValuePair>(); 
    params.add(new BasicNameValuePair("username", username)); 
    params.add(new BasicNameValuePair("password", password)); 
    params.add(new BasicNameValuePair("prgCode", prgCode)); 
    params.add(new BasicNameValuePair("lang", language)); 
    JSONObject json = jsonParser.getJSONFromUrl(loginURL, params); 

    return json; 
    } 

    //request profile info 
    public JSONObject profileRequest(String prgCode,String token){ 
    // Building Parameters 
    List<NameValuePair> params = new ArrayList<NameValuePair>(); 
    params.add(new BasicNameValuePair("prgCode", prgCode)); 
    params.add(new BasicNameValuePair("token", token)); 
    JSONObject json = jsonParser.getJSONFromUrl(profileURL, params); 

    return json; 
    } 
} 

然後就可以調用每個人在各自的活動中的AsyncTask

protected String doInBackground(String... args){ 
    MyRequests request = new MyRequest(); 
    jsonObject = request.loginRequest(username,password); 

    //handle json object here 




return null; 
}