android - 覆盖 getText 的 EditText

Question

我想覆盖 EditText 的 getText()。

我收到这种字符串:"12,345,678"

我的目的是只删除逗号并返回 Editable，但是当我使用我的代码时出现错误。

public class AmountEditText extends EditText {
    @Override
    public Editable getText() {
        Editable s = super.getText();
        if(s!=null && s.length()>0) {
            if (s.toString().contains(",")) {
                return new SpannableStringBuilder(s.toString().replace(",", ""));
            }
        }
        return s;
    }
    private TextWatcher watcher = 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) {
            int position = getSelectionStart();
            int nbCommaBefore;
            int nbCommaAfter;
            String str = s.toString();
            String finalStr;
            String formattedStr;
            nbCommaBefore  = str.length() - str.replace(",", "").length();
            boolean containsDot = false;
            if (str.contains(".")) {
                containsDot = true;
                formattedStr = str.split("\\.")[0];

            } else {
                formattedStr = str;
            }
            if (!s.toString().isEmpty()) {
                removeTextChangedListener(watcher);
                formattedStr = formattedStr.replace(",", "");
                formattedStr = formattedStr.replaceAll("(\\d)(?=(\\d{3})+$)", "$1,");
                if (containsDot) {
                    if (str.split("\\.").length != 1) {
                        finalStr = formattedStr + "." + str.split("\\.")[1].replace(",", "");
                    } else {
                        finalStr = formattedStr + ".";
                    }
                } else {
                    finalStr = formattedStr;
                }
                nbCommaAfter  = finalStr.length() - finalStr.replace(",", "").length();
                setText(finalStr);
                if (position == str.length()){
                    setSelection(finalStr.length());
                }
                else if (position == 0)
                {
                    setSelection(0);
                }
                else if (nbCommaBefore < nbCommaAfter){
                    setSelection(position + 1);
                }

                else if (nbCommaAfter < nbCommaBefore){
                    setSelection(position - 1);
                }
                else{
                    setSelection(position);
                }
                addTextChangedListener(watcher);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
        }

    };

    public AmountEditText(Context context) {
        this(context, null);
    }

    public AmountEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        addTextChangedListener(watcher);
    }

    public AmountEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        addTextChangedListener(watcher);
    }
}

E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback E/MessageQueue-JNI: java.lang.IndexOutOfBoundsException: setSpan (0 ... 5) ends beyond length 4 at android.text.SpannableStringBuilder.checkRange(SpannableStringBuilder.java:1265) at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:684) at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:677) at android.widget.SpellChecker$SpellParser.setRangeSpan(SpellChecker.java:532) at android.widget.SpellChecker$SpellParser.parse(SpellChecker.java:515) at android.widget.SpellChecker.spellCheck(SpellChecker.java:242) at android.widget.Editor.updateSpellCheckSpans(Editor.java:679) at android.widget.Editor.sendOnTextChanged(Editor.java:1249) at android.widget.TextView.sendOnTextChanged(TextView.java:8191) at android.widget.TextView.setText(TextView.java:4483) at android.widget.TextView.setText(TextView.java:4337) at android.widget.EditText.setText(EditText.java:89) at android.widget.TextView.setText(TextView.java:4312) at org.newtonproject.newpay.widgetlib.AmountEditText$1.onTextChanged(AmountEditText.java:74)

我想明确指出错误不是来 self 的 onTextChanged因为没有 getText() override

一切正常

EDIT :用户可以输入数字，我会附加一些逗号以格式化数字。但是当我覆盖 getText() 时，我想以这种方式删除这些逗号，我不必每次都过滤 getText() 的返回

Answer 1

好的，我调试了一下，发现问题就在那一行

if (position == str.length()){
    setSelection(finalStr.length());
}

lenght() 超出集合选择范围，因为它是基于 0 的

只需更改您的代码即可正常工作

if (position == str.length()){
   setSelection(finalStr.length() - 1);
}

如果需要，完整代码在这里(我使用 AppCompatEditText，但它是一样的):

public class AmountEditText extends android.support.v7.widget.AppCompatEditText {
    @Override
    public Editable getText() {
        Editable s = super.getText();
        if(s!=null && s.length()>0) {
            if (s.toString().contains(",")) {
                return new SpannableStringBuilder(s.toString().replace(",", ""));
            }
        }
        return s;
    }
    private TextWatcher watcher = 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) {
            int position = getSelectionStart();
            int nbCommaBefore;
            int nbCommaAfter;
            String str = s.toString();
            String finalStr;
            String formattedStr;
            nbCommaBefore  = str.length() - str.replace(",", "").length();
            boolean containsDot = false;
            if (str.contains(".")) {
                containsDot = true;
                formattedStr = str.split("\\.")[0];

            } else {
                formattedStr = str;
            }
            if (!s.toString().isEmpty()) {
                removeTextChangedListener(watcher);
                formattedStr = formattedStr.replace(",", "");
                formattedStr = formattedStr.replaceAll("(\\d)(?=(\\d{3})+$)", "$1,");
                if (containsDot) {
                    if (str.split("\\.").length != 1) {
                        finalStr = formattedStr + "." + str.split("\\.")[1].replace(",", "");
                    } else {
                        finalStr = formattedStr + ".";
                    }
                } else {
                    finalStr = formattedStr;
                }
                nbCommaAfter  = finalStr.length() - finalStr.replace(",", "").length();
                setText(finalStr);
                if (position == str.length()){
                    setSelection(finalStr.length() - 1);
                }
                else if (position == 0)
                {
                    setSelection(0);
                }
                else if (nbCommaBefore < nbCommaAfter){
                    setSelection(position + 1);
                }

                else if (nbCommaAfter < nbCommaBefore){
                    setSelection(position - 1);
                }
                else{
                    setSelection(position);
                }
                addTextChangedListener(watcher);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
        }

    };

    public AmountEditText(Context context) {
        this(context, null);
    }

    public AmountEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        addTextChangedListener(watcher);
    }

    public AmountEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        addTextChangedListener(watcher);
    }
}

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