apk防止重新签名

int getSignature(String packageName) {
PackageManager pm = getPackageManager();
PackageInfo pi = null;
int sig = 0;
try {
pi = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
Signature [] s = pi.signatures;
sig = s[0].hashCode();
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return sig;

}

通过判断这个函数返回值是不是用不同的keystore来重新签名了。