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Хамидилло Мамытов
Asked:2020-07-05 18:12:35 +0000 UTC2020-07-05 18:12:35 +0000 UTC

如何在 textwatcher 中大写输入值？

  • 772

我的尝试是这样的：

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

            String originalText = s.toString();
            int originalTextLength = originalText.length();
            int currentSelection = textHeading.getSelectionStart();

            StringBuilder sb = new StringBuilder();
            boolean hasChanged = false;
            for (int i = 0; i < originalTextLength; i++) {
                char currentChar = originalText.charAt(i);
                if (isAllowed(currentChar) && i < 21) {
                    if (i == 0){
                        String str = "" + currentChar;
                        str.toUpperCase();
                        sb.append(str);
                    }
                    sb.append(currentChar);
                } else {
                    hasChanged = true;
                    if (currentSelection >= i) {
                        textHeading.setError("Please insert current letters");
                        currentSelection--;
                    }
                }
            }
            if (hasChanged) {
                String newText = sb.toString();
                textHeading.setText(newText);
                textHeading.setSelection(currentSelection);
            }
        }

如您所见，我非常愚蠢地检查 i 索引并愚蠢地做了一个 apercase，但它没有按应有的方式工作。但需要用户在输入第一个字母后立即将第一个字母变为大写，然后即使输入大写，反之亦然。问题是，如果你在edittext中联网新数据，那么你会得到一个无限循环，因为监听器被触发并且onTextChanged方法被重新启动，等等无限循环。

android

1 个回答

  1. Best Answer

    一种不使用“textwatcher”的解决方案：在字段的标记中添加 - android:inputType="textCapWords"

    可能适合？

    public class TWatcherPhone implements TextWatcher {
    public EditText editText;
    Activity activ;
    int length;
    int maxLen;
    char firstChar;
    char lastChar;

    public TWatcherPhone(Activity activ, EditText et) {
        super();
        this.activ = activ;
        this.editText = et;
    }

    public void afterTextChanged(Editable s) {
        length = editText.getText().length();
        if (length > 0) {
            firstChar = editText.getText().charAt(0);
            maxLen = firstChar == '8' ? 11 : 13;
            lastChar = editText.getText().charAt(length - 1);
            if (length > maxLen) {
                String str = editText.getText().subSequence(0, maxLen).toString();
                editText.setText("");
                editText.append(str);
                ShowMessage(activ, "Превышение длины строки!\nМаксимально: " + maxLen, Toast.LENGTH_SHORT, Gravity.CENTER);
            } else {
                if ((length == 1 && (lastChar == '+' || lastChar == '8')) || (length > 1 && lastChar >= '0' && lastChar <= '9')) {
                    pr("Ok");
                } else {
                    ShowMessage(activ, "\"" + lastChar + "\"  - недопустимый символ!", Toast.LENGTH_SHORT, Gravity.CENTER);
                    String str = editText.getText().subSequence(0, editText.getText().length() - 1).toString();
                    editText.setText("");
                    editText.append(str);
                }
            }
        }
    }

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

    • 1

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