老套路先上效果圖：

設(shè)置輸入框的兩個(gè)篩選器：

etGiftName.setFilters(new InputFilter[]{new ZsInputFilter(5,this), new LengthListener(5,this)});

我們來看下篩選器如何實(shí)現(xiàn)的：

先看中文篩選器

package com.yhsh.mobile.giftcomponent;import android.app.Activity; import android.text.InputFilter; import android.text.Spanned; import android.widget.Toast;/*** @author 下一頁5（輕飛揚(yáng)）* 創(chuàng)建時(shí)間：2019/8/4 16:38* 個(gè)人小站：http://yhsh.wap.ai(已掛)* 空間名稱：group-wallet-android* 限制中文輸入篩選器*/ public class ZsInputFilter implements InputFilter {private Activity mActivity;private int maxValue;public ZsInputFilter(int maxValue, Activity shopPayActivity) {this.maxValue = maxValue;mActivity = shopPayActivity;}@Overridepublic CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {for (int i = start; i < end; i++) {if (!isChinese(source.charAt(i))) {Toast.makeText(mActivity, "只能輸入中文", Toast.LENGTH_SHORT).show();return "";} else {//是中文,提示最多5個(gè)漢字if (source.length() >= maxValue) {Toast.makeText(mActivity, "最多只能輸入" + maxValue + "個(gè)漢字", Toast.LENGTH_SHORT).show();}}}return null;}private static boolean isChinese(char c) {String regex = "[\\u4e00-\\u9fa5]";return String.valueOf(c).matches(regex);} }

再看下長度篩選器：

package com.yhsh.mobile.giftcomponent;import android.app.Activity; import android.text.InputFilter; import android.text.Spanned; import android.widget.Toast;/*** @author 下一頁5（輕飛揚(yáng)）* 創(chuàng)建時(shí)間：2019/8/5 10:21* 個(gè)人小站：http://yhsh.wap.ai(已掛)* 空間名稱：group-wallet-android*/ public class LengthListener implements InputFilter {private final int mMax;private Activity mActivity;public LengthListener(int max, Activity activity) {mMax = max;mActivity = activity;}@Overridepublic CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {int keep = mMax - (dest.length() - (dend - dstart));if (keep <= 0) {Toast.makeText(mActivity, "最多只能輸入" + mMax + "個(gè)漢字", Toast.LENGTH_SHORT).show();return "";} else if (keep >= end - start) {return null;} else {keep += start;if (Character.isHighSurrogate(source.charAt(keep - 1))) {--keep;if (keep == start) {return "";}}return source.subSequence(start, keep);}}/*** @return the maximum length enforced by this input filter*/public int getMax() {return mMax;} }

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