如何在Android EditText实时编辑后格式化数字

vxqlmq5t 于 2023-02-27 发布在 Android

关注(0)|答案(7)|浏览(121)

我有一个EditText，用户应该在其中输入一个数字，包括小数，我想一个千分隔符自动添加到输入的数字，我尝试了一些其他的方法，但有些不允许浮点数，所以我想出了这个代码，它工作得很好，只有字符串输入没有被实时编辑为一个可能的千分隔符和错误似乎源于s。

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));
        }
    }
};

android

来源：https://stackoverflow.com/questions/12542211/how-to-format-number-in-android-edittext-after-realtime-editing

7条答案

按热度按时间

nbnkbykc1#

这个类解决了这个问题，允许小数点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

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eyh26e7m2#

不幸的是，代码没有工作，因为它是在答案。
它有两个问题：
1.如果电话区域设置配置使用“，”作为十进制分隔符，则此功能不起作用。
1.如果数字的小数部分有尾随零，则不起作用。例如1.01。
我发疯似的去修，最后终于找到了这段在手机上运行良好的代码：

数字文本监视器.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);

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col17t5w3#

您需要将DecimalFormat类与DecimalFormatSymbols类一起使用，请检查以下方法，

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

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5rgfhyps4#

你可以像这样使用Kotlin扩展函数...

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()

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mbjcgjjk5#

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));

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yv5phkfx6#

我在Kotlin中对对话框使用了这种方式：

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)
        }
    }

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kpbpu0087#

我尝试过解决方案，但结尾为0时出现问题，有时用户只想输入0.01或0.0001，
我不知道是否有其他人张贴了相同的答案或没有，但如果这有帮助，

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

import java.text.DecimalFormat;

public class NumberTextWatcher implements TextWatcher {
    private DecimalFormat dfnd;
    private boolean hasFractionalPart;

    private EditText inputView;

    public static void bindView(EditText inputView) {
        NumberTextWatcher temp = new NumberTextWatcher(inputView);
        inputView.addTextChangedListener(temp);
    }

    public NumberTextWatcher(EditText inputView) {
        dfnd = new DecimalFormat("#,###.######");
        this.inputView = inputView;
        hasFractionalPart = false;
    }

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

    public void afterTextChanged(Editable s) {
        Log.d(TAG, "afterTextChanged() called with: s = [" + s + "]");
        inputView.removeTextChangedListener(this);

        try {
            String text = inputView.getText().toString().replace(String.valueOf(dfnd.getDecimalFormatSymbols().getGroupingSeparator()), "");
            if(text.charAt(text.length() - 1) == '.')
            {
                if(getCount(text,'.') >1)
                {
                    text = text.substring(0,text.length()-1);
                }
            }
            String afterDecimalPoint = "";
            String beforeDecimalPoint = text;
            if (hasFractionalPart || (text.charAt(text.length() - 1) == '0')) {
                String[] data = text.split("\\.");
                beforeDecimalPoint = data[0];
                if (data.length != 2) {
                    afterDecimalPoint = ".";
                } else {
                    afterDecimalPoint = "." + data[1];
                    if (data[1].length() >= dfnd.getMaximumFractionDigits()) {
                        afterDecimalPoint = "." + data[1].substring(0, dfnd.getMaximumFractionDigits());
                    }
                }
            }
            beforeDecimalPoint = dfnd.format(Double.parseDouble(beforeDecimalPoint));
            String finalText = beforeDecimalPoint;
            if (hasFractionalPart) {
                finalText = beforeDecimalPoint + afterDecimalPoint;
            }
            inputView.setText(finalText);
            inputView.setSelection(finalText.length());

        } catch (Exception nfe) {
            // do nothing?
            nfe.printStackTrace();
        }

        inputView.addTextChangedListener(this);
    }

    private int getCount(String someString, char someChar) {
        int count = 0;

        for (int i = 0; i < someString.length(); i++) {
            if (someString.charAt(i) == someChar) {
                count++;
            }
        }
        return count;
    }

    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(dfnd.getDecimalFormatSymbols().getDecimalSeparator()))) {
            hasFractionalPart = true;
        } else {
            hasFractionalPart = false;
        }
    }
}

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如何在Android EditText实时编辑后格式化数字

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