货币输入为2个十进制格式 [英] Currency input with 2 decimal format

问题描述

我需要使用2位小数格式设置输入货币的格式 例如，当用户输入2时，它看起来是$ 2.00，然后当用户输入2时，它转换为$ 22.00 ...等等

I need to format input currency with 2 decimal format example when user enter 2 it looks $2.00 then when when user enter 2 it convert to $22.00 ... etc

我采用类似的方法，当用户输入2时，它将转换为$ 0.02，下2个将是$ 0.22

I approach to something similar , when user enter 2 it convert to $0.02 next 2 will be like this $0.22

任何人都可以帮助我谢谢

any one can help me thank you

public class MoneyTextWatcher implements TextWatcher {
    private final WeakReference<EditText> editTextWeakReference;

    public MoneyTextWatcher(EditText mEditText) {
        editTextWeakReference = new WeakReference<EditText>(mEditText);
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

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

       EditText editTex = editTextWeakReference.get();
        if(!s.toString().equals(editTex.getText())) {
            editTex.removeTextChangedListener(this);
            String cleanString = s.toString().replaceAll("[$,.]", "");
            double parsed = Double.parseDouble(cleanString.replaceAll("[^\\d]", ""));
            String formatted = NumberFormat.getCurrencyInstance().format((parsed / 100));
            editTex.setText(formatted);
            editTex.setSelection(formatted.length());

            editTex.addTextChangedListener(this);

    }

    @Override
    public void afterTextChanged(Editable s) {

    }


    }
}

推荐答案

我认为您可以尝试以下操作:

I think you can try the following:

布局:

<EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"
        />

活动:

EditText editText = (EditText) findViewById(R.id.editText);
editText.addTextChangedListener(new NumberTextWatcher(editText, "#,###"));

具有以下文本观察器:

public class NumberTextWatcher implements TextWatcher {

    private final DecimalFormat df;
    private final DecimalFormat dfnd;
    private final EditText et;
    private boolean hasFractionalPart;
    private int trailingZeroCount;

    public NumberTextWatcher(EditText editText, String pattern) {
        df = new DecimalFormat(pattern);
        df.setDecimalSeparatorAlwaysShown(true);
        dfnd = new DecimalFormat("#,###.00");
        this.et = editText;
        hasFractionalPart = false;
    }

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

        if (s != null && !s.toString().isEmpty()) {
            try {
                int inilen, endlen;
                inilen = et.getText().length();
                String v = s.toString().replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()), "").replace("$","");
                Number n = df.parse(v);
                int cp = et.getSelectionStart();
                if (hasFractionalPart) {
                    StringBuilder trailingZeros = new StringBuilder();
                    while (trailingZeroCount-- > 0)
                        trailingZeros.append('0');
                    et.setText(df.format(n) + trailingZeros.toString());
                } else {
                    et.setText(dfnd.format(n));
                }
                et.setText("$".concat(et.getText().toString()));
                endlen = et.getText().length();
                int sel = (cp + (endlen - inilen));
                if (sel > 0 && sel < et.getText().length()) {
                    et.setSelection(sel);
                } else if (trailingZeroCount > -1) {
                    et.setSelection(et.getText().length() - 3);
                } else {
                    et.setSelection(et.getText().length());
                }
            } catch (NumberFormatException | ParseException e) {
                e.printStackTrace();
            }
        }

        et.addTextChangedListener(this);
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        int index = s.toString().indexOf(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator()));
        trailingZeroCount = 0;
        if (index > -1) {
            for (index++; index < s.length(); index++) {
                if (s.charAt(index) == '0')
                    trailingZeroCount++;
                else {
                    trailingZeroCount = 0;
                }
            }
            hasFractionalPart = true;
        } else {
            hasFractionalPart = false;
        }
    }
}

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