對話框投擲「無法添加窗口 - 令牌null不是一個應用程序

我有創造一個警告對話框這說明了一個問題 - 無法添加窗口 - 令牌null不是一個應用程序對話框投擲「無法添加窗口 - 令牌null不是一個應用程序

public class Authenticator { 

public static final String TAG = "Authenticator"; 

public static int getUserId(final String username, final String password) { 

    int retVal = 0; 

    final QuickTexterApplication qta = QuickTexterApplication.getQuickTexterApplication(); 
    final Handler handler = new Handler(); 

    Thread thread = new Thread(new Runnable() { 
     public void run() {     
      Runnable displayGUIRun = new Runnable() { 
       public void run() { 
        int userId = 0; 
        HttpURLConnection urlConnection = null; 
        String urlAuthenticator = qta.getResources().getString(R.string.urlAuthenticator);      
        try{ 
         URL url = new URL(urlAuthenticator); 
         urlConnection = (HttpURLConnection) url.openConnection(); 

         urlConnection.setRequestMethod("POST");   
         urlConnection.setDoInput(true); 
         urlConnection.setDoOutput(true); 

         DataOutputStream wr = new DataOutputStream(urlConnection.getOutputStream()); 

         wr.writeBytes("username=" + username + "&"); 
         wr.writeBytes("password=" + password); 
         wr.flush(); 
         wr.close(); 

         urlConnection.connect(); 

         if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK){ 
          Log.d(TAG,"HTTP OK"); 
          InputStream inStream = urlConnection.getInputStream(); 
          BufferedReader in = new BufferedReader(new InputStreamReader(inStream)); 

          String inLine = in.readLine();     
          in.close(); 

          Log.d(TAG,"inLine: " + inLine); 
          userId = Integer.parseInt(inLine); 
         } 
         else { 
          Log.d(TAG,"HTTP NOT OK"); 
         } 

         String alertMsg = "Unable to establish connection to server"; 
         switch(userId){ 
          case -1 : 
           alertMsg = "You entered an invalid username or password"; 
          case 0 : // This is where the exception occurs 
           AlertDialog.Builder alertBuilder = new AlertDialog.Builder(qta.getApplicationContext()); 
           Log.d(TAG, alertMsg); 
           alertBuilder.setMessage(alertMsg) 
              .setNeutralButton("Ok", new DialogInterface.OnClickListener(){ 
               @Override 
               public void onClick(DialogInterface dialog, int id) { 
                dialog.cancel(); 
               } 

              }); 
           AlertDialog alert = alertBuilder.create(); 
           alert.show(); 
           break;

我不能使用「this」作爲上下文，因爲Authenticator不是一個Avitvity
但是，然後getApplicationContext（）也不工作...
我想要做的是調用方法：getUserId（）從一個Activity類

來源

2012-07-27 user1557213

你有t o在您的Authenticator類中創建構造函數，它將爲您的類提供上下文。並通過調用此構造函數將上下文傳遞給此類。

public class Authenticator { 
     Context myContext; 

    public Authenticator(YourActivity activity) 
    { 
    // TODO Auto-generated constructor stub 
    this.myContext = activity;   
    } 
    }

以這種方式你可以得到這個類的上下文。讓我知道它的工作與否。 :)

來源

2012-07-27 13:09:17 Akshay

對話框投擲「無法添加窗口 - 令牌null不是一個應用程序

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