AlertDialog

new AlertDialog.Builder(this)
.setTitle("退出提示")
.setMessage("您真的要退出吗？")
.setIcon(R.drawable.icon)
.setPositiveButton("ok",new OnClickListener(){				
	public void onClick(DialogInterface dialog, int which) {
		// TODO Auto-generated method stub
		finish();
	}				
})
.setNegativeButton("cancel",new OnClickListener(){				
	public void onClick(DialogInterface dialog, int which) {
		// TODO Auto-generated method stub					
	}				
})
.create().show();