decode Unicode, read \uXXXX - Android java.lang

Android examples for java.lang:String Unicode

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Description

decode Unicode, read \uXXXX

Demo Code

import android.annotation.SuppressLint;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main{

    public static String decodeUnicode(String theString) {
        try {//w w  w . j a  va 2  s.co  m
            char aChar;
            int len = theString.length();
            StringBuffer outBuffer = new StringBuffer(len);
            for (int x = 0; x < len;) {
                aChar = theString.charAt(x++);
                if (aChar == '\\') {
                    aChar = theString.charAt(x++);
                    if (aChar == 'u') {
                        // Read the xxxx
                        int value = 0;
                        for (int i = 0; i < 4; i++) {
                            aChar = theString.charAt(x++);
                            switch (aChar) {
                            case '0':
                            case '1':
                            case '2':
                            case '3':
                            case '4':
                            case '5':
                            case '6':
                            case '7':
                            case '8':
                            case '9':
                                value = (value << 4) + aChar - '0';
                                break;
                            case 'a':
                            case 'b':
                            case 'c':
                            case 'd':
                            case 'e':
                            case 'f':
                                value = (value << 4) + 10 + aChar - 'a';
                                break;
                            case 'A':
                            case 'B':
                            case 'C':
                            case 'D':
                            case 'E':
                            case 'F':
                                value = (value << 4) + 10 + aChar - 'A';
                                break;
                            default:
                                throw new IllegalArgumentException(
                                        "Malformed   \\uxxxx   encoding.");
                            }

                        }
                        outBuffer.append((char) value);
                    } else {
                        if (aChar == 't')
                            aChar = '\t';
                        else if (aChar == 'r')
                            aChar = '\r';
                        else if (aChar == 'n')
                            aChar = '\n';
                        else if (aChar == 'f')
                            aChar = '\f';
                        outBuffer.append(aChar);
                    }
                } else
                    outBuffer.append(aChar);
            }
            return outBuffer.toString();
        } catch (Exception e) {
            return "";
        }
    }

}

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