getapplication（）在類擴展fragement或）在班asynchtask

Question

有沒有getapplication（延伸fragement和asynchtask，我只有背景下如何得到應用

，因爲我需要調用全局變量

GlobalVariables appState = (GlobalVariables) getApplication(); 

Encounter EncounterObject = appState.encounters.get(position); 

在任一這些類的

ackage com.appnetics; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.StatusLine; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONObject; 

import android.app.Application; 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.os.AsyncTask; 

/* 
* onPreExecute()- create the progress bar dialog. 
* doInBackground()- start the new thread. 
* onPostExecute()- dismiss the progress bar dialog. 
* */ 
    class EncounterBackgroundWorker extends AsyncTask<Void, Void, Void> { 

     ProgressDialog connectionProgressDialog; 


     private Context context; 


     public EncounterBackgroundWorker(Context Context ) 
     { 
      this.context=Context; 

      } 


     @Override 
     protected void onPreExecute() { 


      connectionProgressDialog = new ProgressDialog(context); 
      connectionProgressDialog.setCancelable(false); 
      connectionProgressDialog.setCanceledOnTouchOutside(false); 
      connectionProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
      connectionProgressDialog.setMessage("Uploading Leads..."); 
      connectionProgressDialog.show(); 
     } 
     @Override 
     protected Void doInBackground(Void... params) { 
     try { 
      // Call the Encounter web service 
      String Result = null; 

      StringBuilder URL = new StringBuilder(); 

      URL.append("http://163.121.237.103/ali");//this.URL.getText() 
      URL.append("/Service.svc/ReturnEncounter"); 

      /*URL.append("http://192.168.254.31:90/Service.svc/Login/"); 
      URL.append(username.getText()); 
      URL.append("/"); 
      URL.append(password.getText()); 

      finalResult.setText( URL.toString()) ;*/ 
      ///////////////////////////// 
      HttpClient client = new DefaultHttpClient(); 
      HttpGet httpGet = new HttpGet(
        URL.toString()); 




      try { 
       HttpResponse response = client.execute(httpGet); 
       StatusLine statusLine = response.getStatusLine(); 
       int statusCode = statusLine.getStatusCode(); 
       if (statusCode == 200) { 
        HttpEntity entity = response.getEntity(); 
        InputStream content = entity.getContent(); 
        BufferedReader reader = new BufferedReader(
          new InputStreamReader(content)); 


        // Read the JSON 
        Result = reader.readLine(); 

        // Convert the string to Array 


        GlobalVariables appState = new GlobalVariables(); 

        appState.encounters =new ArrayList<Encounter>(); 



        JSONArray array=new JSONArray(Result); 

        // Loop through and fill 
        for(int i=0;i<array.length();i++){ 

         JSONObject elem=(JSONObject)array.get(i); 
         Encounter encounter=new Encounter(); 

         encounter.PatientID=elem.getInt("PatientID"); 
         encounter.PatientName = elem.getString("PatientName"); 

         encounter.NOKName= elem.getString("NOKName"); 
         encounter.ReferalName= elem.getString("ReferalName"); 

         encounter.bookingDate= elem.getString("bookingDate"); 
         encounter.Onclogist= elem.getString("Onclogist"); 
         encounter.EncounterStatus= elem.getString("EncounterStatus"); 

         encounter.EncounterType= elem.getString("EncounterType"); 
         encounter.Regieme= elem.getString("Regieme"); 


         appState.encounters.add(encounter); 
        } 




       } else { 
        Result = "error"; 
       } 
      } catch (ClientProtocolException e) { 
       Result = "error"; 
       e.printStackTrace(); 
      } catch (IOException e) { 
       Result = "error"; 
       e.printStackTrace(); 
      } 







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

      return null; 
     }   
    @Override 
     protected void onPostExecute(Void result) { 
     connectionProgressDialog.dismiss(); 
     } 
    } 


---------------- and I call it in -------------- 

/* 
* This class to provide the code for the Chemo unit screen that will be used 
* 
* */ 

package com.appnetics; 

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.Gravity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.ViewGroup.LayoutParams; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TextView; 

public class ChemoUnit extends Fragment { 

    /*The main controls*/ 
    TextView Patient, Nok , Referrer , Oncologist = null ; 
    ListView MainGrid ; 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 


     View view = inflater.inflate(
        R.layout.chemounit, 
        container, 
        false); 
     // Intialize the Controls 
     Patient = ((TextView) view.findViewById(R.id.Patient)); 
     Nok = ((TextView) view.findViewById(R.id.Nok)); 
     Referrer = ((TextView) view.findViewById(R.id.Referrer)); 
     Oncologist = ((TextView) view.findViewById(R.id.Oncologist)); 




     //Intialize the record Grid 
     LinearLayout formLayout = (LinearLayout)view.findViewById(R.id.ChemoUnitGrid); 
     formLayout.removeAllViews(); 

     MainGrid = new ListView(getActivity().getApplicationContext());    
     MainGrid.setVisibility(ListView.VISIBLE); 
     LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
       LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); 
     params.gravity = Gravity.RIGHT; 
     MainGrid.setLayoutParams(params); 



     //1. set the header 

     ViewGroup header = (ViewGroup)inflater.inflate(R.layout.chemounitgridheader, MainGrid, false); 
     MainGrid.addHeaderView(header, null, false); 

     //2. Call the web Service 


     new EncounterBackgroundWorker(getActivity()).execute(); 

     MainGrid.setAdapter(new Encounteradapter(view.getContext(), null)); 
     // Finally add it 

     formLayout.addView(MainGrid); 



     // Return the Result 
     return inflater.inflate(R.layout.chemounit, container, false); 
    } 

Answer 1

用途：

getActivity().getApplication();