FragmentActivity abstracted

MFragmentActivity.java

public abstract class MFragmentActivity extends FragmentActivity {
 protected abstract Fragment createFragment();
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);
        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);
        if (fragment == null) {
            fragment = createFragment();         // createFragment() the implemented method
            fm.beginTransaction().add(R.id.fragmentContainer, fragment).commit(); 
        }
    }
}