在 Android 中使用千位分隔符 (,) 键入时如何格式化 EditText 的输入？

Question

我有一个edittext ，它只获取没有十进制数字的数字。

android:inputType="number"

我想在打字时分开数千个。 例如 25,000。

我知道我应该使用TextWatcher并且我已经使用了这段代码，但我无法让它工作：

@Override
        public void afterTextChanged(Editable viewss) {
            String s = null;
            try {
                // The comma in the format specifier does the trick
                s = String.format("%,d", Long.parseLong(viewss.toString()));
            } catch (NumberFormatException e) {
            }

        }

你能帮我这样做吗？

Answer 1

测试这个例子：

import java.text.DecimalFormat;
import java.text.ParseException;

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

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";

    @Override
    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);
    }

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

    @Override
    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;
        }
    }

}

要使用它，请将 TextChangedListener 添加到 EditText 组件。

editText.addTextChangedListener(new NumberTextWatcher(editText));

Answer 2

将此添加到您的应用程序的 Gradle compile 'com.aldoapps:autoformatedittext:0.9.3' in XML xmlns:app="http://schemas.android.com/apk/res-auto"

<com.aldoapps.autoformatedittext.AutoFormatEditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:isDecimal="true"
    android:maxLength="8"
    android:id="@+id/number"/>

这个lib自动加(,)(.)

Answer 3

DecimalFormat formatter = new DecimalFormat("#,###,###");
String yourFormattedString = formatter.format(100000);

使用十进制格式

Answer 4

Adrian Cid Almageur 评论的Kotlin 版本

import android.text.Editable
import android.text.TextWatcher
import android.widget.EditText
import java.text.DecimalFormat
import java.text.ParseException

class NumberTextWatcher(private val editText: EditText) : TextWatcher {

    private val decimalFormat = DecimalFormat("#,###.##")
    private val decimalFormatNoFrac = DecimalFormat("#,###")

    private var hasFractionalPart = false

    init {
        decimalFormat.isDecimalSeparatorAlwaysShown = true
    }

    override fun afterTextChanged(s: Editable?) {
        editText.removeTextChangedListener(this)

        try {
            val initialLength = editText.text.length

            val v = s.toString()
                .replace(decimalFormat.decimalFormatSymbols.groupingSeparator.toString(), "")
            val number = decimalFormat.parse(v)

            val cp = editText.selectionStart
            if (hasFractionalPart) {
                editText.setText(decimalFormat.format(number))
            } else {
                editText.setText(decimalFormatNoFrac.format(number))
            }
            val endLength = editText.length()
            val selection = (cp + (endLength - initialLength))
            if (selection > 0 && selection <= editText.text.length) {
                editText.setSelection(selection)
            } else {
                editText.setSelection(editText.text.length - 1)
            }
        } catch (nfe: NumberFormatException) {

        } catch (ex: ParseException) {

        }

        editText.addTextChangedListener(this)
    }

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
        hasFractionalPart =
            s.toString().contains(decimalFormat.decimalFormatSymbols.decimalSeparator)
    }

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