提示的EditText字符限制

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:maxLength="10" />

InputFilter filter = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end,
            Spanned dest, int dstart, int dend) {
        int maxLength = 10;
        int inputLength = dest.length() + source.length() - (dend - dstart);
        if (inputLength > maxLength) {
            return "";
        }
        return null;
    }
};

EditText editText = findViewById(R.id.editText);
editText.setFilters(new InputFilter[] { filter });

EditText editText = findViewById(R.id.editText);
editText.addTextChangedListener(new TextWatcher() {
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // 在文本变化之前的操作
    }

    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // 在文本变化时的操作
        int maxLength = 10;
        if (s.length() > maxLength) {
            editText.setText(s.subSequence(0, maxLength));
            editText.setSelection(maxLength);
        }
    }

    public void afterTextChanged(Editable s) {
        // 在文本变化之后的操作
    }
});