Android学习札记48：将TextView中的指定文字转换为表情显示

import android.content.Context;  import android.text.Spannable;  import android.text.SpannableStringBuilder;  import android.text.style.ImageSpan;  import android.util.Log;  import java.util.HashMap;  import java.util.regex.Matcher;  import java.util.regex.Pattern;public class SmileyParser {private Context mContext;private String[] mSmileyTexts;private HashMap<String, Integer> mSmileyToRes;public static final int DEFAULT_SMILEY_TEXTS = R.array.default_smiley_texts;public static final int[] DEFAULT_SMILEY_RES_IDS = {R.drawable.aini,R.drawable.aoteman,R.drawable.baibai,R.drawable.baobao,R.drawable.beiju,R.drawable.beishang,R.drawable.bianbian,R.drawable.bishi,R.drawable.bizui,R.drawable.buyao,R.drawable.chanzui};private Pattern mPattern;public SmileyParser(Context context) {mContext = context;mSmileyTexts = mContext.getResources().getStringArray(DEFAULT_SMILEY_TEXTS);mSmileyToRes = buildSmileyToRes();mPattern = buildPattern();}private HashMap<String, Integer> buildSmileyToRes() {if (DEFAULT_SMILEY_RES_IDS.length != mSmileyTexts.length) {// Log.w("SmileyParser", "Smiley resource ID/text mismatch");// 表情的数量需要和数组定义的长度一致！throw new IllegalStateException("Smiley resource ID/text mismatch");}HashMap<String, Integer> smileyToRes = new HashMap<String, Integer>(mSmileyTexts.length);for (int i = 0; i < mSmileyTexts.length; i++) {smileyToRes.put(mSmileyTexts[i], DEFAULT_SMILEY_RES_IDS[i]);}return smileyToRes;}// 构建正则表达式private Pattern buildPattern() {StringBuilder patternString = new StringBuilder(mSmileyTexts.length * 3);patternString.append('(');for (String s : mSmileyTexts) {patternString.append(Pattern.quote(s));patternString.append('|');}patternString.replace(patternString.length() - 1, patternString.length(), ")");return Pattern.compile(patternString.toString());}// 根据文本替换成图片public CharSequence replace(CharSequence text) {SpannableStringBuilder builder = new SpannableStringBuilder(text);Matcher matcher = mPattern.matcher(text);while (matcher.find()) {int resId = mSmileyToRes.get(matcher.group());builder.setSpan(new ImageSpan(mContext, resId),matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);}return builder;}}

在 res/arrays.xml 中添加数组：

<?xml version="1.0" encoding="UTF-8"?><resourcesxmlns:android="http://schemas.android.com/apk/res/android"xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2"、><string-array name="default_smiley_texts"><item >[爱你]</item><item >[机器人]</item><item >[拜拜]</item><item >[抱抱]</item><item >[悲剧]</item><item >[悲伤]</item><item >[便便]</item><item >[鄙视]</item><item >[闭嘴]</item><item >[不要]</item><item >[馋嘴]</item></string-array></resources>

使用：

public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);  setContentView(R.layout.main);TextView tvShow = (TextView) findViewById(R.id.tvShow);TextView tvSource = (TextView) findViewById(R.id.tvSource);String text = "[鄙视][爱你][便便][馋嘴][机器人]";tvSource.setText("原文："+text);SmileyParser parser = new SmileyParser(this);tvShow.setText(parser.replace("SmileyParser类处理后:"+text));}

转载自：

http://gundumw100.iteye.com/blog/904107

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