Android Camera how to show buttons during full screen preview
===

I am working on a Android camera apps with target level 2.1
however I find difficult while I enter the full screen mode,
I want to show button during the preview, but it actually hidden, so any one know how to do with it??

this is the code find on this website and have a litte bit modify
http://marakana.com/forums/android/examples/39.html


        Preview preview;
    	Button buttonClick;
    
    	/** Called when the activity is first created. */
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.cameralayout);
    
    		preview = new Preview(this);
    		((FrameLayout) findViewById(R.id.preview)).addView(preview);
    
    		setContentView(R.layout.cameralayout);
    		
    		buttonClick = (Button) findViewById(R.id.buttonClick);
    		buttonClick.setOnClickListener(new OnClickListener() {
    			public void onClick(View v) {
    				preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);
    			}
    		});
    		Log.d(TAG, "onCreate'd");
    	}

this is the xml

    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/preview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    
                <Button
                    android:id="@+id/buttonClick"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center|bottom"
                    android:text="Click" />
    </FrameLayout>

and the manifest has set the theme to make it in full screen

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


So how to make my button visible with the present of full screen preview
Thank you very much~