Switch fragments through spinner in toolbar - android-fragments

Question

This is driving me crazy. I'm trying to switch fragments by using a spinner, but I can't figure out where my mistake is. When I click on one of the spinner items, it always shows me the content of fragment 3, the others will not appear.
I browsed through the internet for hours now, but couldn't find a understandable solution for my problem, since I'm new to android programming.
Thankful for any help!
MainActivity.java
// Setup spinner
Spinner spinner = (Spinner) findViewById(R.id.spinner);
spinner.setAdapter(new MyAdapter(
toolbar.getContext(),
new String[]{
"Fragment 1",
"Fragment 2",
"Fragment 3"
}));
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// When the given dropdown item is selected, show its contents in the
// container view.
switch (position) {
case 0:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, Fragment1.newInstance()).commit();
case 1:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, Fragment2.newInstance()).commit();
default:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, Fragment3.newInstance()).commit();
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Fragment1.java
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment1Fragment extends Fragment {
public static Fragment1Fragment newInstance() {
Fragment1Fragment fragment = new Fragment1Fragment();
return fragment;
}
public Fragment1Fragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_fragment1, container, false);
return rootView;
}
}

Answer 1

My dear,
switch (position) {
case 0:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, Fragment1.newInstance()).commit();
break;
case 1:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, Fragment2.newInstance()).commit();
break;
default:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, Fragment3.newInstance()).commit();
break;
}
Without break statement your all 3 lines executed. So the 3rd Fragment.