package com.wpc.library.widget;
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import android.content.Context;
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import android.text.Spannable;
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import android.text.SpannableString;
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import android.text.style.ScaleXSpan;
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import android.util.AttributeSet;
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import android.widget.TextView;
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/**
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* Created by shanshan on 2018/3/15.
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*/
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public class ChangeTextViewSpace extends TextView {
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private float spacing = Spacing.NORMAL;
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private CharSequence originalText = "";
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public ChangeTextViewSpace(Context context) {
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super(context);
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}
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public ChangeTextViewSpace(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public ChangeTextViewSpace(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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/**
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* 获取字间距
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*/
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public float getSpacing() {
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return this.spacing;
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}
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/**
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* 设置间距
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*/
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public void setSpacing(float spacing) {
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this.spacing = spacing;
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applySpacing();
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}
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@Override
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public void setText(CharSequence text, BufferType type) {
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originalText = text;
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applySpacing();
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}
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@Override
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public CharSequence getText() {
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return originalText;
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}
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/**
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* 扩大文字空间
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*/
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private void applySpacing() {
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if (this == null || this.originalText == null) return;
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StringBuilder builder = new StringBuilder();
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for (int i = 0; i < originalText.length(); i++) {
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builder.append(originalText.charAt(i));
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if (i + 1 < originalText.length()) {
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//如果前后都是英文，则不添加空格，防止英文空格太大
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if (isEnglish(originalText.charAt(i) + "") && isEnglish(originalText.charAt(i + 1) + "")) {
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} else {
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// \u00A0 不间断空格 碰见文字追加空格
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builder.append("\u00A0");
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}
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}
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}
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// 通过SpannableString类，去设置空格
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SpannableString finalText = new SpannableString(builder.toString());
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// 如果当前TextView内容长度大于1，则进行空格添加
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if (builder.toString().length() > 1) {
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for (int i = 1; i < builder.toString().length(); i += 2) {
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// ScaleXSpan 基于x轴缩放 按照x轴等比例进行缩放 通过字间距+1除以10进行等比缩放
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finalText.setSpan(new ScaleXSpan((spacing + 1) / 10), i, i + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
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}
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}
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super.setText(finalText, BufferType.SPANNABLE);
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}
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public class Spacing {
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public final static float NORMAL = 0;
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}
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/**
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* 判断是否是英语
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*/
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public static boolean isEnglish(String charaString) {
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return charaString.matches("^[a-zA-Z]*");
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}
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}
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