我正在创建一个转换器应用程序。 我想设置EditText,以便当用户输入要转换的数字时,实时自动添加千位分隔符(
当擦除到低于4个数字时,数字恢复正常。
需要帮助吗?
,
),一旦增加了3个数字:千、百万、十亿等。当擦除到低于4个数字时,数字恢复正常。
需要帮助吗?
,
),一旦增加了3个数字:千、百万、十亿等。EditText
文本更改时,将千位分隔符放入其中。0.
。0
输入。NumberTextWatcherForThousand
,它实现了TextWatcher
。import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.util.StringTokenizer;
/**
* Created by skb on 12/14/2015.
*/
public class NumberTextWatcherForThousand implements TextWatcher {
EditText editText;
public NumberTextWatcherForThousand(EditText editText) {
this.editText = editText;
}
@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) {
try
{
editText.removeTextChangedListener(this);
String value = editText.getText().toString();
if (value != null && !value.equals(""))
{
if(value.startsWith(".")){
editText.setText("0.");
}
if(value.startsWith("0") && !value.startsWith("0.")){
editText.setText("");
}
String str = editText.getText().toString().replaceAll(",", "");
if (!value.equals(""))
editText.setText(getDecimalFormattedString(str));
editText.setSelection(editText.getText().toString().length());
}
editText.addTextChangedListener(this);
return;
}
catch (Exception ex)
{
ex.printStackTrace();
editText.addTextChangedListener(this);
}
}
public static String getDecimalFormattedString(String value)
{
StringTokenizer lst = new StringTokenizer(value, ".");
String str1 = value;
String str2 = "";
if (lst.countTokens() > 1)
{
str1 = lst.nextToken();
str2 = lst.nextToken();
}
String str3 = "";
int i = 0;
int j = -1 + str1.length();
if (str1.charAt( -1 + str1.length()) == '.')
{
j--;
str3 = ".";
}
for (int k = j;; k--)
{
if (k < 0)
{
if (str2.length() > 0)
str3 = str3 + "." + str2;
return str3;
}
if (i == 3)
{
str3 = "," + str3;
i = 0;
}
str3 = str1.charAt(k) + str3;
i++;
}
}
public static String trimCommaOfString(String string) {
// String returnString;
if(string.contains(",")){
return string.replace(",","");}
else {
return string;
}
}
}
EditText
上使用此类,如下所示。editText.addTextChangedListener(new NumberTextWatcherForThousand(editText));
获取纯双精度文本输入
使用同一类的trimCommaOfString
方法,像这样:
NumberTextWatcherForThousand.trimCommaOfString(editText.getText().toString())
可以翻译为:{{链接1:Git}}
TextWatcher
中使用 String.format()
。格式字符串中的逗号起到重要作用。但是,对于浮点输入,此方法无效。并且请注意不要使用 TextWatcher 设置无限循环。public void afterTextChanged(Editable view) {
String s = null;
try {
// The comma in the format specifier does the trick
s = String.format("%,d", Long.parseLong(view.toString()));
} catch (NumberFormatException e) {
}
// Set s back to the view after temporarily removing the text change listener
}
public static String doubleToStringNoDecimal(double d) {
DecimalFormat formatter = (DecimalFormat) NumberFormat.getInstance(Locale.US);
formatter.applyPattern("#,###");
return formatter.format(d);
}
这个示例应用程序清晰地解构了格式化数字。
总结上面的链接,使用 TextWatcher
在 afterTextChanged()
方法中使用以下逻辑对 EditText
视图进行格式化:
@Override
public void afterTextChanged(Editable s) {
editText.removeTextChangedListener(this);
try {
String originalString = s.toString();
Long longval;
if (originalString.contains(",")) {
originalString = originalString.replaceAll(",", "");
}
longval = Long.parseLong(originalString);
DecimalFormat formatter = (DecimalFormat) NumberFormat.getInstance(Locale.US);
formatter.applyPattern("#,###,###,###");
String formattedString = formatter.format(longval);
//setting text after format to EditText
editText.setText(formattedString);
editText.setSelection(editText.getText().length());
} catch (NumberFormatException nfe) {
nfe.printStackTrace();
}
editText.addTextChangedListener(this);
}
Locale
相应地使用。getDecimalFormattedString
方法。 import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.text.DecimalFormat;
/**
* Created by srv_twry on 4/12/17.
* Source: https://dev59.com/8Wct5IYBdhLWcg3wHZ1q#34265406
* The custom TextWatcher that automatically adds thousand separators in EditText.
*/
public class ThousandSeparatorTextWatcher implements TextWatcher {
private DecimalFormat df;
private EditText editText;
private static String thousandSeparator;
private static String decimalMarker;
private int cursorPosition;
public ThousandSeparatorTextWatcher(EditText editText) {
this.editText = editText;
df = new DecimalFormat("#,###.##");
df.setDecimalSeparatorAlwaysShown(true);
thousandSeparator = Character.toString(df.getDecimalFormatSymbols().getGroupingSeparator());
decimalMarker = Character.toString(df.getDecimalFormatSymbols().getDecimalSeparator());
}
@Override
public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
cursorPosition = editText.getText().toString().length() - editText.getSelectionStart();
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
@Override
public void afterTextChanged(Editable s) {
try {
editText.removeTextChangedListener(this);
String value = editText.getText().toString();
if (value != null && !value.equals("")) {
if (value.startsWith(decimalMarker)) {
String text = "0" + decimalMarker;
editText.setText(text);
}
if (value.startsWith("0") && !value.startsWith("0" + decimalMarker)) {
int index = 0;
while (index < value.length() && value.charAt(index) == '0') {
index++;
}
String newValue = Character.toString(value.charAt(0));
if (index != 0) {
newValue = value.charAt(0) + value.substring(index);
}
editText.setText(newValue);
}
String str = editText.getText().toString().replaceAll(thousandSeparator, "");
if (!value.equals("")) {
editText.setText(getDecimalFormattedString(str));
}
editText.setSelection(editText.getText().toString().length());
}
//setting the cursor back to where it was
editText.setSelection(editText.getText().toString().length() - cursorPosition);
editText.addTextChangedListener(this);
} catch (Exception ex) {
ex.printStackTrace();
editText.addTextChangedListener(this);
}
}
private static String getDecimalFormattedString(String value) {
String[] splitValue = value.split("\\.");
String beforeDecimal = value;
String afterDecimal = null;
String finalResult = "";
if (splitValue.length == 2) {
beforeDecimal = splitValue[0];
afterDecimal = splitValue[1];
}
int count = 0;
for (int i = beforeDecimal.length() - 1; i >= 0 ; i--) {
finalResult = beforeDecimal.charAt(i) + finalResult;
count++;
if (count == 3 && i > 0) {
finalResult = thousandSeparator + finalResult;
count = 0;
}
}
if (afterDecimal != null) {
finalResult = finalResult + decimalMarker + afterDecimal;
}
return finalResult;
}
/*
* Returns the string after removing all the thousands separators.
* */
public static String getOriginalString(String string) {
return string.replace(thousandSeparator,"");
}
}
class SeparateThousands(val groupingSeparator: String, val decimalSeparator: String) : TextWatcher {
private var busy = false
override fun afterTextChanged(s: Editable?) {
if (s != null && !busy) {
busy = true
var place = 0
val decimalPointIndex = s.indexOf(decimalSeparator)
var i = if (decimalPointIndex == -1) {
s.length - 1
} else {
decimalPointIndex - 1
}
while (i >= 0) {
val c = s[i]
if (c == groupingSeparator[0] ) {
s.delete(i, i + 1)
} else {
if (place % 3 == 0 && place != 0) {
// insert a comma to the left of every 3rd digit (counting from right to
// left) unless it's the leftmost digit
s.insert(i + 1, groupingSeparator)
}
place++
}
i--
}
busy = false
}
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
}
然后在xml中:
<EditText
android:id="@+id/myNumberField"
android:digits=",.0123456789"
android:inputType="numberDecimal"
.../>
最后注册观察器:
findViewById(R.id.myNumberField).addTextChangedListener(
SeparateThousands(groupingSeparator, decimalSeparator))
要处理不同地区中的 . 和 ,,请使用 groupingSeparator 和 decimalSeparator,这些可以来自 DecimalFormatSymbols 或本地化字符串。
android:maxLength
一起使用时,groupingSeparator
会随着输入的内容出现和消失。有没有办法只针对“数字”使用android:maxLength
? - Kellin Strook我只是希望放置逗号,并且这对我有用:
String.format("%,.2f", myValue);
private String Spacer(String number){
StringBuilder strB = new StringBuilder();
strB.append(number);
int Three = 0;
for(int i=number.length();i>0;i--){
Three++;
if(Three == 3){
strB.insert(i-1, " ");
Three = 0;
}
}
return strB.toString();
}// end Spacer()
您可以稍微更改它并在OnTextChangeListener上使用它。祝你好运。
ThousandNumberEditText
类。public class ThousandNumberEditText extends android.support.v7.widget.AppCompatEditText {
// TODO: 14/09/2017 change it if you want
private static final int MAX_LENGTH = 20;
private static final int MAX_DECIMAL = 3;
public ThousandNumberEditText(Context context) {
this(context, null);
}
public ThousandNumberEditText(Context context, AttributeSet attrs) {
this(context, attrs, android.support.v7.appcompat.R.attr.editTextStyle);
}
public ThousandNumberEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
addTextChangedListener(new ThousandNumberTextWatcher(this));
setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
setFilters(new InputFilter[] { new InputFilter.LengthFilter(MAX_LENGTH) });
setHint("0"); // TODO: 14/09/2017 change it if you want
}
private static class ThousandNumberTextWatcher implements TextWatcher {
private EditText mEditText;
ThousandNumberTextWatcher(EditText editText) {
mEditText = editText;
}
@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) {
String originalString = editable.toString();
String cleanString = originalString.replaceAll("[,]", "");
if (cleanString.isEmpty()) {
return;
}
String formattedString = getFormatString(cleanString);
mEditText.removeTextChangedListener(this);
mEditText.setText(formattedString);
mEditText.setSelection(mEditText.getText().length());
mEditText.addTextChangedListener(this);
}
/**
* Return the format string
*/
private String getFormatString(String cleanString) {
if (cleanString.contains(".")) {
return formatDecimal(cleanString);
} else {
return formatInteger(cleanString);
}
}
private String formatInteger(String str) {
BigDecimal parsed = new BigDecimal(str);
DecimalFormat formatter;
formatter = new DecimalFormat("#,###");
return formatter.format(parsed);
}
private String formatDecimal(String str) {
if (str.equals(".")) {
return ".";
}
BigDecimal parsed = new BigDecimal(str);
DecimalFormat formatter;
formatter =
new DecimalFormat("#,###." + getDecimalPattern(str)); //example patter #,###.00
return formatter.format(parsed);
}
/**
* It will return suitable pattern for format decimal
* For example: 10.2 -> return 0 | 10.23 -> return 00 | 10.235 -> return 000
*/
private String getDecimalPattern(String str) {
int decimalCount = str.length() - 1 - str.indexOf(".");
StringBuilder decimalPattern = new StringBuilder();
for (int i = 0; i < decimalCount && i < MAX_DECIMAL; i++) {
decimalPattern.append("0");
}
return decimalPattern.toString();
}
}
}
使用
<.ThousandNumberEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
最初的回答:
myEditText.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) {
String input = s.toString();
if (!input.isEmpty()) {
input = input.replace(",", "");
DecimalFormat format = new DecimalFormat("#,###,###");
String newPrice = format.format(Double.parseDouble(input));
myEditText.removeTextChangedListener(this); //To Prevent from Infinite Loop
myEditText.setText(newPrice);
myEditText.setSelection(newPrice.length()); //Move Cursor to end of String
myEditText.addTextChangedListener(this);
}
}
@Override
public void afterTextChanged(final Editable s) {
}
});
要获取最初的回答,请使用以下方法:
String input = myEditText.getText().toString();
input = input.replace(",", "");