android - 实时编辑后如何在android EditText中格式化数字

Question

我有一个 EditText，用户应该在其中输入一个包含小数的数字，我希望在输入数字上自动添加一个千位分隔符我尝试了其他几种方法，但有些方法不允许浮点数，所以我想出了这个有效的代码只是字符串输入没有被实时编辑为一个可能有千位分隔符的字符串，并且错误似乎源于 s.replace();

    am2 = new TextWatcher(){
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }
    public void onTextChanged(CharSequence s, int start, int before, int count) {}
    public void afterTextChanged(Editable s) {
        if (s.toString().equals("")) {
            amount.setText("");
            value = 0;
        }else{
            StringBuffer strBuff = new StringBuffer();
            char c;
            for (int i = 0; i < amount2.getText().toString().length() ; i++) {
                c = amount2.getText().toString().charAt(i);
                if (Character.isDigit(c)) {
                    strBuff.append(c);
                }
            }
            value = Double.parseDouble(strBuff.toString());
            reverse();
            NumberFormat nf2 = NumberFormat.getInstance(Locale.ENGLISH);
            ((DecimalFormat)nf2).applyPattern("###,###.#######");
            s.replace(0, s.length(), nf2.format(value));
        }
    }
};

Answer 1

这个类解决了这个问题，允许十进制输入并添加千位分隔符。

    public class NumberTextWatcher implements TextWatcher {

    private DecimalFormat df;
    private DecimalFormat dfnd;
    private boolean hasFractionalPart;

    private EditText et;

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

    @SuppressWarnings("unused")
    private static final String TAG = "NumberTextWatcher";

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

        try {
            int inilen, endlen;
            inilen = et.getText().length();

            String v = s.toString().replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()), "");
            Number n = df.parse(v);
            int cp = et.getSelectionStart();
            if (hasFractionalPart) {
                et.setText(df.format(n));
            } else {
                et.setText(dfnd.format(n));
            }
            endlen = et.getText().length();
            int sel = (cp + (endlen - inilen));
            if (sel > 0 && sel <= et.getText().length()) {
                et.setSelection(sel);
            } else {
                // place cursor at the end?
                et.setSelection(et.getText().length() - 1);
            }
        } catch (NumberFormatException nfe) {
            // do nothing?
        } catch (ParseException e) {
            // do nothing?
        }

        et.addTextChangedListener(this);
    }

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

    public void onTextChanged(CharSequence s, int start, int before, int count)
    {
        if (s.toString().contains(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator())))
        {
            hasFractionalPart = true;
        } else {
            hasFractionalPart = false;
        }
    }

}

来源：http ://blog.roshka.com/2012/08/android-edittext-with-number-format.html

Answer 2

不幸的是，代码没有像答案那样工作。

它有两个问题：

1. 如果电话区域设置配置使用“，”作为小数分隔符，则它不起作用。
2. 如果数字在小数部分有尾随零，则它不起作用。示例 1.01。

我疯狂地修复它。最后，我找到了在我的手机上运行良好的代码：

NumberTextWatcher.java

import android.text.Editable;
import android.text.TextWatcher;
import android.text.method.DigitsKeyListener;
import android.util.Log;
import android.widget.EditText;

import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.ParseException;
import java.util.Locale;


public class NumberTextWatcher
        implements TextWatcher {

    private static final String TAG = "NumberTextWatcher";

    private final int numDecimals;
    private String groupingSep;
    private String decimalSep;
    private boolean nonUsFormat;
    private DecimalFormat df;
    private DecimalFormat dfnd;
    private boolean hasFractionalPart;

    private EditText et;
    private String value;


    private String replicate(char ch, int n) {
        return new String(new char[n]).replace("\0", "" + ch);
    }

    public NumberTextWatcher(EditText et, Locale locale, int numDecimals) {

        et.setKeyListener(DigitsKeyListener.getInstance("0123456789.,"));
        this.numDecimals = numDecimals;
        DecimalFormatSymbols symbols = new DecimalFormatSymbols(locale);

        char gs = symbols.getGroupingSeparator();
        char ds = symbols.getDecimalSeparator();
        groupingSep = String.valueOf(gs);
        decimalSep = String.valueOf(ds);

        String patternInt = "#,###";
        dfnd = new DecimalFormat(patternInt, symbols);

        String patternDec = patternInt + "." + replicate('#', numDecimals);
        df = new DecimalFormat(patternDec, symbols);
        df.setDecimalSeparatorAlwaysShown(true);
        df.setRoundingMode(RoundingMode.DOWN);

        this.et = et;
        hasFractionalPart = false;

        nonUsFormat = !decimalSep.equals(".");
        value = null;

    }


    @Override
    public void afterTextChanged(Editable s) {
        Log.d(TAG, "afterTextChanged");
        et.removeTextChangedListener(this);

        try {
            int inilen, endlen;
            inilen = et.getText().length();

            String v = value.replace(groupingSep, "");

            Number n = df.parse(v);

            int cp = et.getSelectionStart();
            if (hasFractionalPart) {
                int decPos = v.indexOf(decimalSep) + 1;
                int decLen = v.length() - decPos;
                if (decLen > numDecimals) {
                    v = v.substring(0, decPos + numDecimals);
                }
                int trz = countTrailingZeros(v);

                StringBuilder fmt = new StringBuilder(df.format(n));
                while (trz-- > 0) {
                    fmt.append("0");
                }
                et.setText(fmt.toString());
            } else {
                et.setText(dfnd.format(n));
            }


            endlen = et.getText().length();
            int sel = (cp + (endlen - inilen));
            if (sel > 0 && sel <= et.getText().length()) {
                et.setSelection(sel);
            } else {
                // place cursor at the end?
                et.setSelection(et.getText().length() - 1);
            }


        } catch (NumberFormatException | ParseException nfe) {
            // do nothing?
        }


        et.addTextChangedListener(this);
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        Log.d(TAG, "beforeTextChanged");
        value = et.getText().toString();
    }

    private int countTrailingZeros(String str) {
        int count = 0;

        for (int i = str.length() - 1; i >= 0; i--) {
            char ch = str.charAt(i);
            if ('0' == ch) {
                count++;
            } else {
                break;
            }
        }
        return count;
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        Log.d(TAG, "onTextChanged");

        String newValue = s.toString();
        String change = newValue.substring(start, start + count);
        String prefix = value.substring(0, start);
        String suffix = value.substring(start + before);

        if (".".equals(change) && nonUsFormat) {
            change = decimalSep;
        }

        value = prefix + change + suffix;
        hasFractionalPart = value.contains(decimalSep);

        Log.d(TAG, "VALUE: " + value);


    }

}

然后简单地使用它来做：

    Locale locale = new Locale("es", "AR"); // For example Argentina
    int numDecs = 2; // Let's use 2 decimals
    TextWatcher tw = new NumberTextWatcher(myEditText, locale, numDecs);
    myEditText.addTextChangedListener(tw);

Answer 3

您需要将DecimalFormat类与DecimalFormatSymbols类一起使用，请查看以下方法，

public static String formatAmount(int num) 
{
    DecimalFormat decimalFormat = new DecimalFormat();
    DecimalFormatSymbols decimalFormateSymbol = new DecimalFormatSymbols();
    decimalFormateSymbol.setGroupingSeparator(',');
    decimalFormat.setDecimalFormatSymbols(decimalFormateSymbol);
    return decimalFormat.format(num);
}

Answer 4

您可以像这样使用 kotlin 扩展功能...

fun EditText.onCommaChange(input: (String) -> Unit) {
this.addTextChangedListener(object : TextWatcher {
    override fun afterTextChanged(s: Editable?) {
        if (!edit) {
            edit = true
            if (s.toString() != "₹") {
                try {
                    val flNumber = getCommaLessNumber(s.toString()).toInt()
                    val fNumber = getFormattedAmount(flNumber)
                    setText(fNumber)
                    setSelection(text.length)
                    input(flNumber.toString())
                } catch (e: NumberFormatException) {
                    Timber.e(e)
                }
            } else {
                setText("")
                input("")
            }
            edit = false
        }
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
})}

fun getCommaLessNumber(commaNumber: String): String {
var number = commaNumber.replace("₹", "")
number = number.replace(",".toRegex(), "")
return number}

fun getFormattedAmount(amount: Int): String {
return "₹${String.format("%,d", amount)}"}

fun EditText.text() = this.text.toString()

Answer 5

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.text.DecimalFormat;
public class MyNumberWatcher_3Digit implements TextWatcher {
    private EditText editText;
    private int digit;


    public MyNumberWatcher_3Digit(EditText editText) {
        this.editText = 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) {
        editText.removeTextChangedListener( this );

        String s = editText.getText().toString();
        s = s.replace( ",", "" ).replace( "٬", "" );
        s = replaceNonstandardDigits( s );
        if (s.length() > 0) {
            DecimalFormat sdd = new DecimalFormat( "#,###" );
            Double doubleNumber = Double.parseDouble( s );

            String format = sdd.format( doubleNumber );
            editText.setText( format );
            editText.setSelection( format.length() );

        }
        editText.addTextChangedListener( this );
    }


    static String replaceNonstandardDigits(String input) {
        if (input == null || input.isEmpty()) {
            return input;
        }
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < input.length(); i++) {
            char ch = input.charAt( i );
            if (isNonstandardDigit( ch )) {
                int numericValue = Character.getNumericValue( ch );
                if (numericValue >= 0) {
                    builder.append( numericValue );
                }
            } else {
                builder.append( ch );
            }
        }
        return builder.toString();
    }

    private static boolean isNonstandardDigit(char ch) {
        return Character.isDigit( ch ) && !(ch >= '0' && ch <= '9');
    }


}

// 创建活动

  input_text_rate.addTextChangedListener(new MyNumberWatcher_3Digit(input_text_rate));

Answer 6

我在Kotlin中使用这种方式进行Dialog：

val et = dialog.findViewById(R.id.etNumber) as EditText
et.addTextChangedListener(object : TextWatcher {
                override fun afterTextChanged(s: Editable) {

                    et.removeTextChangedListener(this)
                    forChanged(et)
                    et.addTextChangedListener(this)
                }

                override fun beforeTextChanged(
                    s: CharSequence,
                    start: Int,
                    count: Int,
                    after: Int
                ) {

                }

                override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {

                }
            })

然后写一个这样的方法：

private fun forChanged(alpha: EditText) {
        val string = alpha.text.toString()
        val dec = DecimalFormat("#,###")
        if (!TextUtils.isEmpty(string)) {
            val textWC = string.replace(",".toRegex(), "")
            val number = textWC.toDouble()
            alpha.setText(dec.format(number))
            alpha.setSelection(dec.format(number).length)
        }
    }