Facebook api key

gistfile1.txt

 // Add code to print out the key hash
try {
    PackageInfo info = context.getPackageManager().getPackageInfo(
            BuildConfig.APPLICATION_ID,
            PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
        MessageDigest md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
    }
} catch (PackageManager.NameNotFoundException e) {
    Log.d("KeyHash:", e.toString());
} catch (NoSuchAlgorithmException e) {
    Log.d("KeyHash:", e.toString());
}