Change activity orientation

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <ToggleButton
    android:id="@+id/toggleButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textOff="Lock"
    android:textOn="LOCKED"
  />
</LinearLayout>

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.ToggleButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
/*w ww. j a v a  2 s  .com*/
public class MainActivity extends Activity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ToggleButton toggle = (ToggleButton)findViewById(R.id.toggleButton);
        if( getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED ) {
            toggle.setChecked(true);
        } else {
            toggle.setChecked(false);
        }
        toggle.setOnCheckedChangeListener(listener);
    }

    OnCheckedChangeListener listener = new OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            int current = getResources().getConfiguration().orientation;
            if(isChecked) {
                switch(current) {
                case Configuration.ORIENTATION_LANDSCAPE:
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                    break;
                case Configuration.ORIENTATION_PORTRAIT:
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                    break;
                default:
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
                }
            } else {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
            }
        }
    };

}