// 初始化警告彈出框 
alertDialog = new EmpAlertView(context, Utils.getIdByName(context, "style", "alert_style")); 
alertDialog.setCanceledOnTouchOutside(false); 
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
layout = inflater.inflate(Utils.getIdByName(context, "layout", "alertview"), null); 
layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
// 設(shè)置半透明背景 
Window window = alertDialog.getWindow(); 
WindowManager.LayoutParams lp = window.getAttributes(); 
lp.alpha = 0.9f; 
window.setAttributes(lp); 
alertDialog.setContentView(layout);

進行頁面操作及用戶提示，一切顯示正常，如圖：

當按下屏幕電源按鈕，再次點亮屏幕，發(fā)現(xiàn)Dialog半透明的灰暗背景消失了.....

解決方法：設(shè)置window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);修改后如下：

// 初始化警告彈出框 
alertDialog = new EmpAlertView(context, Utils.getIdByName(context, "style", "alert_style")); 
alertDialog.setCanceledOnTouchOutside(false); 
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
layout = inflater.inflate(Utils.getIdByName(context, "layout", "alertview"), null); 
layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
Window window = alertDialog.getWindow(); 
WindowManager.LayoutParams lp = window.getAttributes(); 
lp.alpha = 0.9f; 
window.setAttributes(lp); 
// 防止按下再重新開啟屏幕電源，原先變暗的背景變白色 
window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); 
alertDialog.setContentView(layout);

以上所述是小編給大家介紹的Android開發(fā)中Dialog半透明背景消失，希望對大家有所幫助，如果大家有任何疑問，歡迎給我留言，小編會及時回復(fù)大家的！

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