Spinner Control inside Fragmented View with Toast notification

package soni.maulik.booksbyauthor;
import android.content.Context;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.fragment_main, container, false);
//Populate the spinner in the fragment
Spinner spinner = (Spinner) rootView.findViewById(R.id.authorspinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(rootView.getContext(), R.array.authors,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id)
{
String selected = parentView.getItemAtPosition(position).toString();
Context context = parentView.getContext();
CharSequence text = selected;
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
TextView bk = (TextView) rootView.findViewById(R.id.booktext);
switch (position){
case 0:
bk.setText(getResources().getString(R.string.Allen));
break;
case 1:
bk.setText(getResources().getString(R.string.Thomas));
break;
case 2:
bk.setText(getResources().getString(R.string.Dan));
break;
case 3:
bk.setText(getResources().getString(R.string.Michael));
break;
case 4:
bk.setText(getResources().getString(R.string.Ravi));
break;
default:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
return rootView;
}
}
}