sharedPref = getSharedPreferences("sharedPref", Context.MODE_PRIVATE);   // get the sharedpreference set named "A"
        String UserId;  // get value from key but return 0 if nothing is set
        UserId = sharedPref.getString("firebasekey", "");
        Toast.makeText(this,UserId,Toast.LENGTH_SHORT);
        if (UserId != ""){
            Intent intent = new Intent(splash_launcher.this, userload.class);
        startActivity(intent);
        finish();
    }    if (UserId == "") {
        Intent intent1 = new Intent(splash_launcher.this, First_login.class);
        startActivity(intent1);
        finish();
    }