private void getHashKey(){ try { PackageInfo info = getPackageManager().getPackageInfo("com.ourinchoen.foodquest", PackageManager.GET_SIGNATURES); for (Signature signature : info.signatures) { MessageDigest md = MessageDigest.getInstance("SHA"); md.update(signature.toByteArray()); Log.d(TAG,"key_hash="+ Base64.encodeToString(md.digest(), Base64.DEFAULT)); } } catch (PackageManager.NameNotFoundEx..