對話框不工作 - Android

Question

我在操作欄中進行了更新。當你點擊它時，對話框將顯示要求檢查互聯網連接。問題是沒有出現對話框。我想知道我的代碼是否有問題。

private void Refresh() { 

    if(IsparkLib.isInternetConnected(InquiryMainActivity.this)){ 
     nameOfMethod(); 

     AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this); 
     dialog.setTitle("Are you sure you want to update?"); 
     dialog.setCancelable(true); 
     dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() { 

      @Override 
      public void onClick(DialogInterface dialog, int arg1) { 
       // TODO Auto-generated method stub 
       Intent intent = new Intent(InquiryMainActivity.this,InquiryMainActivity.class); 
       intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
       startActivity(intent); 
      } 
     }); 
    } 
    else{ 
     AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this); 
     dialog.setTitle("Warning"); 
     dialog.setPositiveButton("OK",null); 

     final TextView mes = new TextView(InquiryMainActivity.this); 
     mes.setTextColor(Color.BLACK); 
     mes.setText("Please check your internet connection"); 
     mes.setTextSize(20); 


    } 

Answer 1

我想你不是打電話給dialog.show();。檢查一次。

在else塊嘗試像這樣...

else{ 
    AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this); 
    dialog.setTitle("Warning"); 
    dialog.setPositiveButton("OK",null); 

    final TextView mes = new TextView(InquiryMainActivity.this); 
    mes.setTextColor(Color.BLACK); 
    mes.setText("Please check your internet connection"); 
    mes.setTextSize(20); 

    dialog.show();//=> here is the change 
} 

Answer 2

編輯您的代碼

private void Refresh() { 

    if(IsparkLib.isInternetConnected(InquiryMainActivity.this)){ 
     nameOfMethod(); 

     AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this); 
     dialog.setTitle("Are you sure you want to update?"); 
     dialog.setCancelable(true); 
     dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() { 

      @Override 
      public void onClick(DialogInterface dialog, int arg1) { 
       // TODO Auto-generated method stub 
       Intent intent = new Intent(InquiryMainActivity.this,InquiryMainActivity.class); 
       intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
       startActivity(intent); 
      } 
     }); 

     dialog.show(); 
    } 
    else{ 
     AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this); 
     dialog.setTitle("Warning"); 
     dialog.setPositiveButton("OK",null); 

     /*final TextView mes = new TextView(InquiryMainActivity.this); 
     mes.setTextColor(Color.BLACK); 
     mes.setText("Please check your internet connection"); 
     mes.setTextSize(20);*/ It's not necessary 

     dialog.setMessage("Please check your internet connection");// 

     dialog.show(); 
    } 

Answer 3

您需要調用AlertDialog.show()到在屏幕上顯示警報做得一樣：

AlertDialog alertDialog = dialog.create(); 
// show it 
alertDialog.show(); 

Answer 4

您忘記了從AlertDialog.Builder對象創建AlertDialog實例，並且顯示對話框。

另一件事，你已經嘗試創建AlertDialog.Builder對象都if-else條件Refresh()方法，但你應該建立如下的if-else條件外...

private void Refresh() { 

    AlertDialog.Builder dialog = new AlertDialog.Builder(InquiryMainActivity.this); 

    if(IsparkLib.isInternetConnected(InquiryMainActivity.this)){ 
     nameOfMethod(); 

     dialog.setTitle("Are you sure you want to update?"); 
     dialog.setCancelable(true); 
     dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() { 

      @Override 
      public void onClick(DialogInterface dialog, int arg1) { 
       // TODO Auto-generated method stub 
       Intent intent = new Intent(InquiryMainActivity.this,InquiryMainActivity.class); 
       intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
       startActivity(intent); 
      } 
     }); 

    } else { 

     dialog.setTitle("Warning"); 
     dialog.setPositiveButton("OK",null); 

     final TextView mes = new TextView(InquiryMainActivity.this); 
     mes.setTextColor(Color.BLACK); 
     mes.setText("Please check your internet connection"); 
     mes.setTextSize(20); 

    } 

    AlertDialog alertDialog = dialog.createDialog(); 
    alertDialog.show(); 

} 

更新：

對於取消選項，您必須添加另一個按鈕到對話框如下...

dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
    @Override 
    public void onClick(DialogInterface dialog, int id) { 

     //add your code 
     dialog.dismiss(); 

    } 
}); 

Answer 5

後ifelse條件如下兩個線路添加這個..

AlertDialog alertDialog = dialog.createDialog(); 
    alertDialog.show(); 

你完成你的代碼....