当我点击按钮？ edittext中的插入值应为total，并使用SELECT QUERY在另一个edittext中显示Calculate？

Question

所有插入PaymentPaid（editText）的值应为sum并显示为totalamt（Edittext）。  “

Next.setOnClickListener（new View.OnClickListener（）{

    public void onClick(View arg0) {

    try {

                String sql= Select-------?
        String amntpaid=PaymentPaid.getText().toString();       
        String totamnt=totalamt.getText().toString();
                }
                catch (Exception e) {
                e.printStackTrace();
                }
                }
            });`

Answer 1

试试这个.......

 int subtotal = 0;
 int total =0;
 Cursor  cursor = dh.rawQuery("SELECT _column_name FROM table_name WHERE _column_name LIKE ? ", new String[] {"%"});
if(cursor.moveToFirst())   
            do{

    subtotal = cursor.getInt(cursor.getColumnIndex("_column_name"));
                total = total+subtotal;
            }while(cursor.moveToNext());
     total_show_edttxt.setext(total);