动态实现隐藏标题栏

package com.test.HelloGridView; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.Window; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
 
public class HelloGridView extends Activity 
{ 
    public void onCreate(Bundle savedInstanceState) 
    { 
        requestWindowFeature(Window.FEATURE_NO_TITLE); 
 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
 
        TextView tv = (TextView)this.findViewById(R.id.myTitleBarTextView); 
        tv.setBackgroundColor(0xFF848284); 
        tv.setTextColor(0xFFFFFFFF); 
 
        Button toggleTitleButton = (Button)this.findViewById(R.id.toggle_title_button); 
 
        toggleTitleButton.setOnClickListener( new OnClickListener() 
                { 
                        @Override 
                        public void onClick(View v) 
                        { 
                                LinearLayout ll = (LinearLayout)findViewById(R.id.myTitleBarLayout); 
 
                                if(ll.getVisibility() == View.GONE) 
                                { 
                                        ll.setVisibility(View.VISIBLE); 
                                } 
                                else 
                                { 
                                        ll.setVisibility(View.GONE); 
                                } 
                        } 
                }); 
    } 
}

private void updateFullscreenStatus(bUseFullscreen) 
{    
   if(bUseFullscreen) 
   { 
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN); 
    } 
    else 
    { 
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN); 
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    } 
 
    m_contentView.requestLayout(); 
}

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"