老套路先上效果图：

设置输入框的两个筛选器：

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

我们来看下筛选器如何实现的：

先看中文筛选器

package com.yhsh.mobile.giftcomponent;import android.app.Activity;
import android.text.InputFilter;
import android.text.Spanned;
import android.widget.Toast;/*** @author 下一页5（轻飞扬）*         创建时间：2019/8/4 16:38*         个人小站：http://yhsh.wap.ai(已挂)*         空间名称：group-wallet-android*         限制中文输入筛选器*/
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, "只能输入中文", Toast.LENGTH_SHORT).show();return "";} else {//是中文,提示最多5个汉字if (source.length() >= maxValue) {Toast.makeText(mActivity, "最多只能输入" + maxValue + "个汉字", Toast.LENGTH_SHORT).show();}}}return null;}private static boolean isChinese(char c) {String regex = "[\\u4e00-\\u9fa5]";return String.valueOf(c).matches(regex);}
}

再看下长度筛选器：

package com.yhsh.mobile.giftcomponent;import android.app.Activity;
import android.text.InputFilter;
import android.text.Spanned;
import android.widget.Toast;/*** @author 下一页5（轻飞扬）*         创建时间：2019/8/5 10:21*         个人小站：http://yhsh.wap.ai(已挂)*         空间名称：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, "最多只能输入" + mMax + "个汉字", 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;}
}