获取当前输入域的文本长度限制- Android输入法

EditText editText = findViewById(R.id.edit_text);
InputFilter[] filters = editText.getFilters();
for (InputFilter filter : filters) {
    if (filter instanceof InputFilter.LengthFilter) {
        int maxLength = ((InputFilter.LengthFilter) filter).getMax();
        // maxLength即为当前输入域的文本长度限制
        break;
    }
}

EditText editText = findViewById(R.id.edit_text);
InputFilter[] filters = editText.getFilters();
for (InputFilter filter : filters) {
    if (filter instanceof InputFilter.LengthFilter) {
        try {
            Field maxField = filter.getClass().getDeclaredField("mMax");
            maxField.setAccessible(true);
            int maxLength = (int) maxField.get(filter);
            // maxLength即为当前输入域的文本长度限制
            break;
        } catch (NoSuchFieldException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}