Android ::与其他InputFilter一起以编程方式设置EditText的最大长度 [英] Android:: Set max-length of EditText programmatically with other InputFilter

问题描述

我正在使用InputFilter这样只允许字母和数字

I'm using InputFilter like this to allow only alpha and numbers

private InputFilter[] inputFilters = new InputFilter[] { new InputFilter()
{
    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend)
    {
        for (int i = start; i < end; ++i)
        {
            if (!Pattern.compile("[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890]*").matcher(String.valueOf(source.charAt(i))).matches())
            {
                return "";
            }
        }

        return null;
    }
} };

但是问题是xml文件中的"android:maxLength"值无法与此InputFilter一起使用

But problem is "android:maxLength" value in xml file is not working with this InputFilter

我认为我需要InputFilter中的代码来设置EditText的最大长度

I think I need code in InputFilter to set max-length of EditText

有人对此有好主意吗?

谢谢

推荐答案

只需尝试这种方式

InputFilter

InputFilter filter = new InputFilter() {
        @Override
        public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
            for (int i = start; i < end; ++i)
            {
                if (!Pattern.compile("[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890]*").matcher(String.valueOf(source.charAt(i))).matches())
                {
                    return "";
                }
            }

            return null;
        }
    };

如何申请

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EditText edt =(EditText)findViewById(R.id.edt) ;

        edt.setFilters(new InputFilter[]{filter,new InputFilter.LengthFilter(10)});


    }

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