ProgressDialog的用法

pd= new ProgressDialog(AndroidTestActivity.this);   //是Activity 的 Context
         
         pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);//
         pd.setTitle("提示");//
         pd.setMessage("正在联系中...");
         Window window = pd.getWindow();   
            WindowManager.LayoutParams lp = window.getAttributes();   
            lp.alpha = 0.1f;// 透明度   
            lp.dimAmount = 0.1f;// 黑暗度   
            window.setAttributes(lp);  
            pd.setCancelable(false);//能否被点击取消
         pd.show();