Question

我有三个EditText元素。我想根据前两个edittext值进行计算，以存储在所需的编辑文本字段中。

但计算错误总是如此。每当我从secound编辑文本中清除键入的值时，计算就不能正常工作。

 public void onTextChanged(CharSequence s, int a, int b, int c) {
            try{
                a=Integer.parseInt(totamt.getText().toString().trim());
                b=Integer.parseInt(expenses.getText().toString().trim());
                c=Integer.parseInt(handover_amt.getText().toString().trim());
                int d = Integer.parseInt(String.valueOf(a)) - Integer.parseInt(String.valueOf(b)) - Integer.parseInt(String.valueOf(c));
                balance_amt.setText(String.valueOf(d));

                int myOB =  Integer.parseInt(et_overall_balance.getText().toString().trim());
                int OverallBalance = Integer.parseInt(String.valueOf(myOB)) - Integer.parseInt(handover_amt.getText().toString().trim());
                et_overall_balance.setText(String.valueOf(OverallBalance));
                System.out.println(OverallBalance);

            }catch(NumberFormatException numberEx)
            {
                System.out.println(numberEx);
            }

        }

Answer 1

使用以下代码

edittext2.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                if (edittext1.getText().toString().trim() != null && !edittext1.getText().toString().trim().equalsIgnoreCase("")) {
                    if (edittext2.getText().toString().trim() != null && !edittext2.getText().toString().trim().equalsIgnoreCase("")) {
                        edittext3.setText("" + (Double.parseDouble(edittext1.getText().toString().trim()) - Double.parseDouble(edittext2.getText().toString().trim())));
                    } else {
                        Toast.makeText(activity, "Please enter value in edittext 2", Toast.LENGTH_LONG).show();
                    }
                } else {
                    Toast.makeText(activity, "Please enter value in edittext 1", Toast.LENGTH_LONG).show();
                }
            }
        });

Android Text Watcher Calculation缺失

1 个答案: