A class for showing a view as pop-up [Android]

PBPopupBanner.java

package com.example.utils;

import android.app.Activity;
import android.graphics.Color;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;

public class PBPopupBanner {
	
	private Activity originalActivity_;
	private FrameLayout baseLayout_;
	private RelativeLayout backgroundLayout_;
	private View contentView_;
	
	public PBPopupBanner(Activity activity)
	{
		originalActivity_ = activity;
		
		baseLayout_ = new FrameLayout(originalActivity_);
		
		backgroundLayout_ = new RelativeLayout(originalActivity_);
		backgroundLayout_.setBackgroundColor(Color.argb(128, 0, 0, 0));
		backgroundLayout_.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
		backgroundLayout_.setGravity(Gravity.CENTER);
		final PBPopupBanner self = this;
		backgroundLayout_.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				self.dismiss();
			}
		});
		
	}
	
	public PBPopupBanner(Activity activity, View view)
	{
		this(activity);
		setView(view);
	}
	
	public void setView(View view)
	{
		contentView_ = view;
	}
	
	public void show()
	{
		ViewGroup contentRoot = (ViewGroup)originalActivity_.findViewById(android.R.id.content);
		int count = contentRoot.getChildCount();
		for (int i = 0; i < count; i++){
			View view = contentRoot.getChildAt(i);
			contentRoot.removeView(view);
			baseLayout_.addView(view);
		}
		baseLayout_.addView(backgroundLayout_);
		backgroundLayout_.addView(contentView_);
		contentRoot.addView(baseLayout_);
	}
	
	public void dismiss()
	{
		ViewGroup contentRoot = (ViewGroup)originalActivity_.findViewById(android.R.id.content);
		contentRoot.removeView(baseLayout_);
		backgroundLayout_.removeView(contentView_);
		baseLayout_.removeView(backgroundLayout_);
		int count = baseLayout_.getChildCount();
		for (int i = 0; i < count; i++){
			View view = baseLayout_.getChildAt(i);
			baseLayout_.removeView(view);
			contentRoot.addView(view);
		}
	}

}