Set system UI to low profile

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:text="Toggle Mode"
        android:onClick="onToggleClick" />
</RelativeLayout>

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
/*w  w w. j av a2s .c  om*/
public class MainActivity extends Activity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    
    public void onToggleClick(View v) {
        int currentVis = v.getSystemUiVisibility();
        int newVis;
        if ((currentVis & View.SYSTEM_UI_FLAG_LOW_PROFILE) == View.SYSTEM_UI_FLAG_LOW_PROFILE) {
            newVis = View.SYSTEM_UI_FLAG_VISIBLE;
        } else {
            newVis = View.SYSTEM_UI_FLAG_LOW_PROFILE;
        }
        v.setSystemUiVisibility(newVis);
    }
}