Dialog透明度的设立

Dialog透明度的设置
Dialog dg = new Dialog(this);    
Window window = dg.getWindow();    
WindowManager.LayoutParams lp = window.getAttributes();    
lp.alpha = 0.5f;    
window.setAttributes(lp);    
//lp.alpha = 0.5f 透明度设置 其值要合理 自己反复测试