限制Editext输入字节长度

来源：互联网发布：苏州大禹网络怎么样编辑：程序博客网时间：2024/05/22 03:30

在 xml 文件中设置文本编辑框属性作字符数限制

如：Android:maxLength="10" 即限制最大输入字符个数为10

这样限制的话限制的是字符长度，有的并不能实现需求，那么限制字节长度应该怎么处理呢？请看如下所示：

 InputFilter[] filters = new InputFilter[]{new LimitCharLengthFilter(12)}; editext.setFilters(filters);

import java.io.UnsupportedEncodingException;import android.text.InputFilter;import android.text.Spanned;/** * 限制输入的字符的数量 * * @author xfc */public class LimitCharLengthFilter implements InputFilter {    private int mMax = 0;    public LimitCharLengthFilter(int mMax) {        super();        this.mMax = mMax;    }    public CharSequence filter(CharSequence source, int start, int end,                               Spanned dest, int dstart, int dend) {        int bytes = 0;        int sourceBytes = 0;        int keep = 0;        try {            bytes = dest.toString().getBytes("GBK").length;            sourceBytes = source.toString().getBytes("GBK").length;            if (bytes + sourceBytes <= mMax) {                keep = source.length();            } else {                for (int i = 0; i < source.length(); i++) {                    int currentSoureBytes = source.subSequence(0, i + 1)                            .toString().getBytes("GBK").length;                    if (bytes + currentSoureBytes > mMax) {                        keep = i;                        break;                    }                }            }        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        if (keep <= 0) {            return "";        }        return source.subSequence(start, keep + start);    }}

这样是不是很简单就实现了呢，快去试试效果吧。

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