android - IndexOutOfBoundsException setSpan (0 ... 1) 超出长度 0 结束

Question

我将这个库用于带有标签的 Material editText: https://github.com/rey5137/Material/wiki/Text-Field不错的图书馆:)

但是……

我正在使用下一个代码来检查输入的符号是否正确:

private boolean hasCorrectSymbols(String input){
        String tre = "[A-Za-z0-9\\@\\#\\$\\%\\&\\*\\(\\)\\-\\+\\_\\;\\:\\?\\.\\,\\!]+$";
        if (input.matches(tre)){
            return true;
        }
        return false;
    }

我使用 textWatcher 检查正确的符号:

mEditPass.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) {
                if (s.length() == 1 && !loginPassHasCorrectSymbols(s.toString())){
                    mEditPass.getText().clear();
                    String mess = getString(R.string.toast_login_useLatin);
                    showToastMessage(mess);
                } else if (s.length() >1 && !loginPassHasCorrectSymbols(s.toString())) {
                    String mess = getString(R.string.toast_login_useLatin);
                    showToastMessage(mess);
                    String text = s.toString();
                    text = text.substring(0, start);
                    mEditPass.setText(text);
                    mEditPass.setSelection(start);
                }
            }

            @Override
            public void afterTextChanged(Editable s) {}
        });

如果第一个符号是正确的而第二个是错误的 - 系统将剪切最后输入的(错误的)符号并将光标设置到最后一个文本位置，但如果第一个符号是禁止符号 - 它会因此错误而崩溃:

java.lang.IndexOutOfBoundsException: setSpan (0 ... 1) ends beyond length 0
            at android.text.SpannableStringBuilder.checkRange(SpannableStringBuilder.java:1016)
            at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:592)
            at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:588)
            at android.text.method.PasswordTransformationMethod.onTextChanged(PasswordTransformationMethod.java:108)
            at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962)
            at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496)
            at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435)
            at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30)
            at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:683)
            at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:198)
            at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:183)
            at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:279)
            at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5097)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method) 

知道为什么会这样吗？以及如何解决这个问题？？

Answer 1

在此代码 fragment 中，您缩短了 EditText 中显示的文本(以便最后一个有效位置为 start-1)，但仍尝试设置选择开始的位置。

text = text.substring(0, start);
mEditPass.setText(text);
mEditPass.setSelection(start);

[编辑]

假设您的 Toast 消息提示用户修复错误，我认为您真正想要做的是将选择设置为 EditText 中带有错误符号的第一个字符。这是执行此操作的示例代码:

// A reusable Pattern (at the class level) that defines the regex for bad characters.
private static final Pattern ILLEGAL_CHAR_PATTERN = Pattern.compile(
    "[^A-Za-z0-9\\@\\#\\$\\%\\&\\*\\(\\)\\-\\+\\_\\;\\:\\?\\.\\,\\!]"
);

    // Replacement for your listener code.
    mEditPass.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) {
            if (s.length() == 0 || count == 0) {
                return;
            }
            Matcher matcher = ILLEGAL_CHAR_PATTERN.matcher(s);
            if (matcher.find()) {
                int firstIllegalPos = matcher.start();
                mEditPass.setSelection(firstIllegalPos);
                String mess = getString(R.string.toast_login_useLatin);
                showToastMessage(mess);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
        }
    });