Android限制输入框10个汉字或20个字母
16lz
2021-01-23
功能较少，直接看代码：
import android.text.InputFilterimport android.text.Spanned/** * @author: Sid * @email: 1157903494@qq.com * @date: 2018/5/31 17:18 */class ChineseLengthFilter(val length: Int) : InputFilter { override fun filter(source: CharSequence, start: Int, end: Int, dest: Spanned, dstart: Int, dend: Int): CharSequence { var len = calculateLength(dest) val builder = StringBuilder() if (len >= length) { return "" } else { for (c in source) { if (isChineseChar(c)) { len += 2 } else { len++ } builder.append(c) if (len >= length) { break } } } return builder.toString().trim() } private fun isChineseChar(c: Char): Boolean { val ub = Character.UnicodeBlock.of(c) return (ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub === Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS || ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B || ub === Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub === Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS || ub === Character.UnicodeBlock.GENERAL_PUNCTUATION) } private fun calculateLength(source: Spanned): Int { var len = 0 for (c in source) { if (isChineseChar(c)) { len += 2 } else { len++ } } return len }}更多相关文章
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