[Android] String compare the size of the problem

Applications VerName this version name , is there any way to compare the size of it?
This string type bad comparison ah. .
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split split it, and then turn to an integer.
such as: 1.33.1
1 * 100 + 33 * 10 + 1 this year.
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split ('.'), and then one by one to compare the size
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Why is not there a versionCode
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you really creative ah
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follow your example , it seems there will be the chance of error amount . .
such 1.33.1 = 431
and 2.13.1 = 331 smaller than before . . .
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This idea can be used to determine whether the same version
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version of this idea can be used to determine whether the agreement  

judgment consistent with equals does not directly
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amount , I think so think , I wrote a way to go.
public static boolean checkupdate (String s1, String s2) {
String [] s1array = s1.split ("\ \.");
String [] s2array = s2.split ("\ \.");
int s1i = 0, s2i = 0;
if (s1array.length> = s2array.length) {
for (int i = 0; i s1i = Integer.parseInt (s1array [i]);
s2i = Integer.parseInt (s2array [i]);
if (s2i> s1i) {
return true;
}
}
return false;
} else {
for (int i = 0; i s1i = Integer.parseInt (s1array [i]);
s2i = Integer.parseInt (s2array [i]);
if (s2i return false;
}

}
return true;
}

}
s2 big time returns true.