利用android SmileyParser种实现文本表情功能
前段时间做新浪微博，遇到个表情微博处理问题，查了些资料，做了个demo：
上图：
要实现这个效果要分为三步：
1.准备表情图片，并新建一个在values文件加下建数组资源文件: arrays.xml
<?xml version="1.0" encoding="UTF-8"?>
<resources xmlns: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>
<string-array name="default_smiley_names">
<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>
2.到网上google一下SmileyParser 得到SmileyParser类(http://www.oschina.net/code/explore/android-2.2-froyo/com/android/mms/util/SmileyParser.java)根据需求修改下表情图片与特殊字符对应关系。
下面是我demo中使用的类:
package com.my;
import android.content.Context;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ImageSpan;
//import com.android.mms.R;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A class for annotating a CharSequence with spans to convert textual emoticons
* to graphical ones.
*/
public class SmileyParser {
// Singleton stuff
private static SmileyParser sInstance;
public static SmileyParser getInstance() { return sInstance; }
public static void init(Context context) {
sInstance = new SmileyParser(context);
}
private final Context mContext;
private final String[] mSmileyTexts;
private final Pattern mPattern;
private final HashMap<String, Integer> mSmileyToRes;
private SmileyParser(Context context) {
mContext = context;
mSmileyTexts = mContext.getResources().getStringArray(DEFAULT_SMILEY_TEXTS);
mSmileyToRes = buildSmileyToRes();
mPattern = buildPattern();
}
static class Smileys {
//表情图片集合
private static final int[] sIconIds = {
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,
};
//将图片映射为 文字
public static int aini = 0;
public static int aoteman = 1;
public static int baibai = 2;
public static int baobao = 3;
public static int beiju = 4;
public static int beishang = 5;
public static int bianbian = 6;
public static int bishi = 7;
public static int bizui = 8;
public static int buyao = 9;
public static int chanzui = 10;
//得到图片表情 根据id
public static int getSmileyResource(int which) {
return sIconIds[which];
}
}
// NOTE: if you change anything about this array, you must make the corresponding change
// to the string arrays: default_smiley_texts and default_smiley_names in res/values/arrays.xml
public static final int[] DEFAULT_SMILEY_RES_IDS = {
Smileys.getSmileyResource(Smileys.aini), // 0
Smileys.getSmileyResource(Smileys.aoteman), // 1
Smileys.getSmileyResource(Smileys.baibai), // 2
Smileys.getSmileyResource(Smileys.baobao), // 3
Smileys.getSmileyResource(Smileys.beiju), // 4
Smileys.getSmileyResource(Smileys.beishang), // 5
Smileys.getSmileyResource(Smileys.bianbian), // 6
Smileys.getSmileyResource(Smileys.bishi), // 7
Smileys.getSmileyResource(Smileys.bizui), // 8
Smileys.getSmileyResource(Smileys.buyao), // 9
Smileys.getSmileyResource(Smileys.chanzui), // 10
};
public static final int DEFAULT_SMILEY_TEXTS = R.array.default_smiley_texts;
public static final int DEFAULT_SMILEY_NAMES = R.array.default_smiley_names;
/**
* Builds the hashtable we use for mapping the string version
* of a smiley (e.g. ":-)") to a resource ID for the icon version.
*/
private HashMap<String, Integer> buildSmileyToRes() {
if (DEFAULT_SMILEY_RES_IDS.length != mSmileyTexts.length) {
// Throw an exception if someone updated DEFAULT_SMILEY_RES_IDS
// and failed to update arrays.xml
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;
}
/**
* Builds the regular expression we use to find smileys in {@link #addSmileySpans}.
*/
//构建正则表达式
private Pattern buildPattern() {
// Set the StringBuilder capacity with the assumption that the average
// smiley is 3 characters long.
StringBuilder patternString = new StringBuilder(mSmileyTexts.length * 3);
// Build a regex that looks like (:-)|:-(|...), but escaping the smilies
// properly so they will be interpreted literally by the regex matcher.
patternString.append('(');
for (String s : mSmileyTexts) {
patternString.append(Pattern.quote(s));
patternString.append('|');
}
// Replace the extra '|' with a ')'
patternString.replace(patternString.length() - 1, patternString.length(), ")");
return Pattern.compile(patternString.toString());
}
/**
* Adds ImageSpans to a CharSequence that replace textual emoticons such
* as :-) with a graphical version.
*
* @param text A CharSequence possibly containing emoticons
* @return A CharSequence annotated with ImageSpans covering any
* recognized emoticons.
*/
//根据文本替换成图片
public CharSequence addSmileySpans(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;
}
}
3.SmileyParser类处理完之后就是使用了
@Override
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);
------------------------SmileyParser类的使用
//构建处理对象
SmileyParser.init(this);
SmileyParser parser = SmileyParser.getInstance();
String text = "[鄙视]"+"+"+ "[爱你]"+"+"+"[便便]"+"+"+"[馋嘴]";
tvSource.setText("原文："+text);
//通过 调用 SmileyParser类的 addSmileySpans()方法处理 文本
tvShow.setText(parser.addSmileySpans("SmileyParser类处理后:"+text));
}