，我在我们的应用程序做的方式是这样的：

amount.addTextChangedListener(new CurrencyTextWatcher(amount));

而CurrencyTextWatcher是这样的：

public class CurrencyTextWatcher implements TextWatcher {

private EditText ed;

private String lastText;

private boolean bDel = false;

private boolean bInsert = false;

private int pos;

public CurrencyTextWatcher(EditText ed) {

this.ed = ed;

}

public static String getStringWithSeparator(long value) {

DecimalFormat formatter = (DecimalFormat) NumberFormat.getNumberInstance(Locale.US);

String f = formatter.format(value);

return f;

}

@Override

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

bDel = false;

bInsert = false;

if (before == 1 && count == 0) {

bDel = true;

pos = start;

} else if (before == 0 && count == 1) {

bInsert = true;

pos = start;

}

}

@Override

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

lastText = s.toString();

}

@Override

public void afterTextChanged(Editable s) {

ed.removeTextChangedListener(this);

StringBuilder sb = new StringBuilder();

String text = s.toString();

for (int i = 0; i < text.length(); i++) {

if ((text.charAt(i) >= 0x30 && text.charAt(i) <= 0x39) || text.charAt(i) == '.' || text.charAt(i) == ',')

sb.append(text.charAt(i));

}

if (!sb.toString().equals(s.toString())) {

bDel = bInsert = false;

}

String newText = getFormattedString(sb.toString());

s.clear();

s.append(newText);

ed.addTextChangedListener(this);

if (bDel) {

int idx = pos;

if (lastText.length() - 1 > newText.length())

idx--; // if one , is removed

if (idx < 0)

idx = 0;

ed.setSelection(idx);

} else if (bInsert) {

int idx = pos + 1;

if (lastText.length() + 1 < newText.length())

idx++; // if one , is added

if (idx > newText.length())

idx = newText.length();

ed.setSelection(idx);

}

}

private String getFormattedString(String text) {

String res = "";

try {

String temp = text.replace(",", "");

long part1;

String part2 = "";

int dotIndex = temp.indexOf(".");

if (dotIndex >= 0) {

part1 = Long.parseLong(temp.substring(0, dotIndex));

if (dotIndex + 1 <= temp.length()) {

part2 = temp.substring(dotIndex + 1).trim().replace(".", "").replace(",", "");

}

} else

part1 = Long.parseLong(temp);

res = getStringWithSeparator(part1);

if (part2.length() > 0)

res += "." + part2;

else if (dotIndex >= 0)

res += ".";

} catch (Exception ex) {

ex.printStackTrace();

}

return res;

}

现在，如果您将此观察器添加到您的EditText，只要用户输入他的编号，观察器就会决定是否需要分离器。