Fehler beim Aufruf einer Activity

// 1. Activity //////////////////////////////////////////////////////
Intent i = new Intent(getApplicationContext(), SecondActivity.class);
// your parameters as key-value pairs
i.putExtra("Key","value");
startActivity(i);
// 2. Activity //////////////////////////////////////////////////////
@Override
protected void onNewIntent(Intent intent) {
   // the calling intent which startet the second activity
   String value = intent.getStringExtra("key");
   super.onNewIntent(intent);
}
// or
@Override
protected void onCreate(Bundle savedInstanceState) {
    Intent i = getIntent();
    String value = i.getStringExtra("key");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.cal_layout);
}