while語句仍然添加空白行，即使是false？

Question

這是我的代碼。我有一個帶有奇數行的文件。最後還是留下一個空白按鈕。如果我將其更改爲偶數行，它工作正常。 我希望它能讀取每行的行數並添加一個按鈕，而不管是否存在偶數或奇數行。 我在做什麼錯。 謝謝，

 // This builds the number of rows based on the number of lines in the file. 
     while (line != null){ 

      TableRow tblRow = new TableRow(this); 
      tblRow.setPadding(5, 30, 5, 5); 
      table.addView(tblRow); 

      // iterates through the number of lines. 
      // filling each cell with a button with the name of each part in the file. 
      for (int col = 0; col < NUM_COL; col++) { 
       Button btn = new Button(this); 
       btn.setTextSize(14); 
       btn.setText(line); 
       btn.setOnClickListener(this); 
       tblRow.addView(btn); 
       line = reader.readLine(); 
      } 
     }; 

Answer 1

更改這個

while (line != null){ 

     TableRow tblRow = new TableRow(this); 
     tblRow.setPadding(5, 30, 5, 5); 
     table.addView(tblRow); 

     for (int col = 0; col < NUM_COL; col++) { 
      if (line != null) { 
       //Normal flow 
       Button btn = new Button(this); 
       btn.setTextSize(14); 
       btn.setText(line); 
       btn.setOnClickListener(this); 
       tblRow.addView(btn); 
       line = reader.readLine(); 
      }else{ 
       //Guaranteed to happen on odd number of lines since NUM_COL=2 
       //Might want to add a dummy view here if the missing button affects the table display 

       //NOP 

      } 

     } 
}