This I cant solve

Oh right...we need a super-powered energy source before our time travel app will work! I've added one as an object in MainActivity. Fortunately it implements the Parcelable interface! Add it as another extra to the Intent in the onClick() method using the key "EXTRA_ENERGY".

import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText;

public class MainActivity extends Activity {

public Button goButton; public EditText yearField;

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);

goButton = (Button)findViewById(R.id.goButton);
yearField = (EditText)findViewById(R.id.yearField);

final EnergySource source = new EnergySource();

goButton.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
    // Add your code in here!
    Intent intent = new Intent(MainActivity.this, TimeTravelActivity.class);
    intent.putExtra("EXTRA_YEAR", yearField.getText().toString());
    startActivity(intent);
  }
});

} }