EditText插入表情（字符串）到光标所在位置

获取EditText组件

EditText etWeiboContent = (EditText) findViewById(R.id.et_content);

将表情转换成文本

EmoticonsUtil mEmoticons = new EmoticonsUtil(this);
CharSequence emoticonsText = mEmoticons.replace(mEmoticons.getEmoticons()[position]);

获取光标所在位置

int index = etWeiboContent.getSelectionStart();

获取EditText中原有的文本内容

Editable editable = etWeiboContent.getEditableText();

在光标所在位置插入表情转换成文本

if (index < 0 || index >= editable.length()) {
     editable.append(emoticonsText);
 } else {
     editable.insert(index, emoticonsText);
 }

完整的代码如下：

EditText etWeiboContent = (EditText) findViewById(R.id.et_content);

   // 将表情转换成文本
   EmoticonsUtil mEmoticons = new EmoticonsUtil(this);
   CharSequence emoticonsText = mEmoticons.replace(mEmoticons.getEmoticons()[position]);

   // 获取光标所在位置
   int index = etWeiboContent.getSelectionStart();
   // 获取EditText中原有的文本内容
   Editable editable = etWeiboContent.getEditableText();
   // 在光标所在位置插入表情转换成文本
   if (index < 0 || index >= editable.length()) {
       editable.append(emoticonsText);
   } else {
       editable.insert(index, emoticonsText);
   }

有关将表情转换成文本的工具类源码如下：

package com.easipass.sysframe.sc.home;

import java.io.IOException;
import java.io.InputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ImageSpan;

/**
 * 功能描述：文字与表情图标的处理工具类
 * @author android_ls
 */
public class EmoticonsUtil {

    private AssetManager assetManager;

    private String[] emoticons;

    public AssetManager getAssetManager() {
        return assetManager;
    }

    public String[] getEmoticons() {
        return emoticons;
    }

    public EmoticonsUtil(Context context) {
        try {
            assetManager = context.getResources().getAssets();
            emoticons = assetManager.list("emoticons");
            // LogUtil.d("emoticons = " + emoticons.length);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * 将文本中的表情符号替换为表情图片
     *
     * @param text
     *            需要转换的字符
     * @return 带有表情的字符
     */
    public CharSequence replace(String text) {

        // LogUtil.d("text = " + text);

        StringBuilder sb = new StringBuilder();
        sb.append('(');

        for (int i = 0; i < emoticons.length; i++) {
            sb.append(Pattern.quote(emoticons[i]));
            sb.append('|');
        }

        sb.replace(sb.length() - 1, sb.length(), ")");
        // LogUtil.d("sb = " + sb.toString());

        /* \Q    在non-word 字符前加上\，直到\E
         \E    结束\L,\E 和\Q*/
        // 竖线的转义：| ==> u007C

        // (\Qface001.png\E|\Qface002.png\E|\Qface003.png\E|\Qface004.png\E|\Qface005.png\E|\Qface006.png\E|\Qface007.png\E|\Qface008.png\E|\Qface009.png\E|\Qface011.png\E|\Qface012.png\E|\Qface016.png\E|\Qface018.png\E|\Qface019.png\E|\Qface020.png\E|\Qface025.png\E|\Qface026.png\E|\Qface032.png\E|\Qface036.png\E|\Qface037.png\E|\Qface040.png\E|\Qface054.png\E|\Qface055.png\E|\Qface058.png\E|\Qface059.png\E|\Qface060.png\E|\Qface061.png\E|\Qface062.png\E|\Qface063.png\E|\Qface071.png\E|\Qface072.png\E|\Qface073.png\E|\Qface081.png\E|\Qface083.png\E|\Qface085.png\E|\Qface090.png\E|\Qface098.png\E|\Qface099.png\E|\Qface100.png\E|\Qface101.png\E|\Qface102.png\E|\Qface103.png\E|\Qface104.png\E|\Qface105.png\E|\Qface106.png\E|\Qface114.png\E|\Qface121.png\E|\Qface191.png\E|\Qface194.png\E|\Qface196.png\E|\Qface198.png\E|\Qface201.png\E|\Qface202.png\E|\Qface205.png\E|\Qface208.png\E|\Qface217.png\E|\Qface218.png\E|\Qface219.png\E|\Qface220.png\E|\Qface221.png\E|\Qface222.png\E|\Qface223.png\E|\Qface224.png\E|\Qface225.png\E|\Qface226.png\E|\Qface227.png\E|\Qface228.png\E|\Qface229.png\E|\Qface231.png\E|\Qface233.png\E|\Qface234.png\E|\Qface238.png\E|\Qface239.png\E|\Qface242.png\E|\Qface247.png\E|\Qface248.png\E|\Qface251.png\E|\Qface252.png\E|\Qface253.png\E|\Qface254.png\E|\Qface255.png\E|\Qface257.png\E|\Qface258.png\E|\Qface259.png\E|\Qface260.png\E|\Qface261.png\E|\Qface263.png\E|\Qface264.png\E|\Qface265.png\E|\Qface266.png\E|\Qface268.png\E|\Qface270.png\E|\Qface271.png\E|\Qface273.png\E|\Qface274.png\E|\Qface277.png\E|\Qface278.png\E|\Qface279.png\E|\Qface280.png\E|\Qface281.png\E|\Qface285.png\E|\Qface287.png\E|\Qface288.png\E|\Qface290.png\E)

        // 利用 \Q \E 使得正则表示式里的特殊字符全部 文字化了
        Pattern pattern = Pattern.compile(sb.toString());

        try {
            SpannableStringBuilder builder = new SpannableStringBuilder(text);
            Matcher matcher = pattern.matcher(text);
            while (matcher.find()) {

                // 返回匹配到的子字符串
                // LogUtil.d("matcher.group() = " + matcher.group());

                InputStream inStream = assetManager.open("emoticons/" + matcher.group());
                Bitmap bitmap = Bitmap.createScaledBitmap(BitmapFactory.decodeStream(inStream), 60, 60, true);
                ImageSpan span = new ImageSpan(bitmap);

                // 返回匹配到的子字符串在字符串中的索引位置.
                // LogUtil.d("matcher.start() = " + matcher.start());
                // 返回匹配到的子字符串的最后一个字符在字符串中的索引位置.
                // LogUtil.d("matcher.end() = " + matcher.end());

                builder.setSpan(span, matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
            return builder;
        } catch (Exception e) {
            return text;
        }

        /* 04-10 11:01:36.449: I/System.out(17881): text = face011.pngface016.pngface016.png
         04-10 11:01:36.449: I/System.out(17881): sb = (\Qface001.png\E|\Qface002.png\E|\Qface003.png\E|\Qface004.png\E|\Qface005.png\E|\Qface006.png\E|\Qface007.png\E|\Qface008.png\E|\Qface009.png\E|\Qface011.png\E|\Qface012.png\E|\Qface016.png\E|\Qface018.png\E|\Qface019.png\E|\Qface020.png\E|\Qface025.png\E|\Qface026.png\E|\Qface032.png\E|\Qface036.png\E|\Qface037.png\E|\Qface040.png\E|\Qface054.png\E|\Qface055.png\E|\Qface058.png\E|\Qface059.png\E|\Qface060.png\E|\Qface061.png\E|\Qface062.png\E|\Qface063.png\E|\Qface071.png\E|\Qface072.png\E|\Qface073.png\E|\Qface081.png\E|\Qface083.png\E|\Qface085.png\E|\Qface090.png\E|\Qface098.png\E|\Qface099.png\E|\Qface100.png\E|\Qface101.png\E|\Qface102.png\E|\Qface103.png\E|\Qface104.png\E|\Qface105.png\E|\Qface106.png\E|\Qface114.png\E|\Qface121.png\E|\Qface191.png\E|\Qface194.png\E|\Qface196.png\E|\Qface198.png\E|\Qface201.png\E|\Qface202.png\E|\Qface205.png\E|\Qface208.png\E|\Qface217.png\E|\Qface218.png\E|\Qface219.png\E|\Qface220.png\E|\Qface221.png\E|\Qface222.png\E|\Qface223.png\E|\Qface224.png\E|\Qface225.png\E|\Qface226.png\E|\Qface227.png\E|\Qface228.png\E|\Qface229.png\E|\Qface231.png\E|\Qface233.png\E|\Qface234.png\E|\Qface238.png\E|\Qface239.png\E|\Qface242.png\E|\Qface247.png\E|\Qface248.png\E|\Qface251.png\E|\Qface252.png\E|\Qface253.png\E|\Qface254.png\E|\Qface255.png\E|\Qface257.png\E|\Qface258.png\E|\Qface259.png\E|\Qface260.png\E|\Qface261.png\E|\Qface263.png\E|\Qface264.png\E|\Qface265.png\E|\Qface266.png\E|\Qface268.png\E|\Qface270.png\E|\Qface271.png\E|\Qface273.png\E|\Qface274.png\E|\Qface277.png\E|\Qface278.png\E|\Qface279.png\E|\Qface280.png\E|\Qface281.png\E|\Qface285.png\E|\Qface287.png\E|\Qface288.png\E|\Qface290.png\E)
         04-10 11:01:36.459: I/System.out(17881): matcher.group() = face011.png
         04-10 11:01:36.469: I/System.out(17881): matcher.start() = 0
         04-10 11:01:36.469: I/System.out(17881): matcher.end() = 11
         04-10 11:01:36.469: I/System.out(17881): matcher.group() = face016.png
         04-10 11:01:36.479: I/System.out(17881): matcher.start() = 11
         04-10 11:01:36.479: I/System.out(17881): matcher.end() = 22
         04-10 11:01:36.479: I/System.out(17881): matcher.group() = face016.png
         04-10 11:01:36.489: I/System.out(17881): matcher.start() = 22
         04-10 11:01:36.489: I/System.out(17881): matcher.end() = 33*/
    }

}