android - 如何在 EditText 中用逗号分隔数字

Question

我有一个 EditText，其 inputType 为 number。当用户打字时，我想用逗号分隔数字。这是一个小例子:

123 would be represented as 123

1234 would be represented as 1,234

12345 would be represented as 12,345

...and so on.

我尝试使用 TextWatcher 添加逗号，如下所示:

    EditText edittext = findViewById(R.id.cashGiven);

    edittext.addTextChangedListener(new TextWatcher(){

        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            
        }

        @Override
        public void afterTextChanged(Editable editable) {
            editText.setText(separateWithComma(editText.getText().toString().trim()));
        }
    });

在此处粘贴 separateWithComma() 方法会使这个问题变得格外冗长，但它确实有效:我在 Eclipse 上测试了它。我认为 addTextChangedListener 不能以这种方式工作，因为当我这样做时，我的应用程序卡住(然后崩溃)。

有没有更好的方法来实现这个目标？感谢您的积极回应。

Answer 1

试试这个代码:

et.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
                // TODO Auto-generated method stub

            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable s) {
                et.removeTextChangedListener(this);

                try {
                    String givenstring = s.toString();
                    Long longval;
                    if (givenstring.contains(",")) {
                        givenstring = givenstring.replaceAll(",", "");
                    }
                    longval = Long.parseLong(givenstring);
                    DecimalFormat formatter = new DecimalFormat("#,###,###");
                    String formattedString = formatter.format(longval);
                    et.setText(formattedString);
                    et.setSelection(et.getText().length());
                    // to place the cursor at the end of text
                } catch (NumberFormatException nfe) {
                    nfe.printStackTrace();
                } catch (Exception e) {
                    e.printStackTrace();
                }

                et.addTextChangedListener(this);

            }
        });

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