Facebook sdk 3.0 android

Question

I have gone through the tutorials on developer.facebook.com for basic hello world facebook app for android countless times to make sure im not making a mistake but I get the

Answer 1

try

try {
PackageInfo info = getPackageManager().getPackageInfo("com.eatapp", PackageManager.GET_SIGNATURES);
for (Signature signature : info.signatures) {
    MessageDigest md = MessageDigest.getInstance("SHA");
    md.update(signature.toByteArray());
    Log.e("MY KEY HASH:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
}
} catch (NameNotFoundException e) {

} catch (NoSuchAlgorithmException e) {

}

in your main Activity :-) This is the only solution it works for me for Android SDK 3.0