compare two version number - Android java.lang

Android examples for java.lang:String Algorithm

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Description

compare two version number

Demo Code

import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Base64;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main{

    public static int compare(String version1, int st1, String version2,
            int st2) {
        int ssa = 1;
        int ssb = 1;
        if (st1 == version1.length() || st1 == version1.length() + 1) {
            ssa = 0;/*  w  w  w .ja  v a2 s  .c om*/
            if (st2 == version2.length() || st2 == version2.length() + 1) {
                return 0;
            }
        }
        if (st2 == version2.length() || st2 == version2.length() + 1) {
            ssb = 0;
            if (st1 == version1.length() || st1 == version1.length() + 1) {
                return 0;
            }
        }
        int i = st1;
        int a = 0;
        if (ssa != 0) {
            String s1 = "";
            for (; i < version1.length(); i++) {
                if (version1.charAt(i) == '.')
                    break;
                else
                    s1 = s1 + version1.charAt(i);
            }
            a = Integer.valueOf(s1);
        }
        int j = st2;
        int b = 0;
        if (ssb != 0) {
            String s2 = "";
            for (; j < version2.length(); j++) {
                if (version2.charAt(j) == '.')
                    break;
                else
                    s2 = s2 + version2.charAt(j);
            }
            b = Integer.valueOf(s2);
        }
        if (a > b)
            return 1;
        else {
            if (a < b)
                return -1;
            else {
                if (ssa == 0 || ssb == 0)
                    return 0;
                else
                    return compare(version1, i + 1, version2, j + 1);
            }
        }
    }

}

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