Implement onClick() method in your Activity/Fragment public class MainActivity extends Activity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onClick(View v) {
switch (itemId) {
// if you call the fragment with nevigation bar then used.
case R.id.nav_menu1:
fragment = new IntroductionFragment();
break;
// if call activity with nevigation bar then used.
case R.id.nav_menu6:
Intent i = new Intent(MainActivity.this, YoutubeActivity.class);
startActivity(i);
// default method for handling onClick Events..
}
}