package org.ntlab.radishforandroidstudio.cactusClient; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.app.AppCompatActivity; import org.ntlab.radishforandroidstudio.R; import org.ntlab.radishforandroidstudio.cactusClient.views.LoginFragment; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Fragment fragment; fragment = new LoginFragment(); getSupportFragmentManager().beginTransaction().add(R.id.fragment_place, fragment).commit(); } }