Android之Dialog半透明背景消失

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     近日，遇到一個Dialog半透明背景消失的問題，背景需求是自訂Dialog實現警告提示框：

// 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));// 設定半透明背景Window window = alertDialog.getWindow(); WindowManager.LayoutParams lp = window.getAttributes();lp.alpha = 0.9f;window.setAttributes(lp);alertDialog.setContentView(layout);

進行頁面操作及使用者提示，一切顯示正常，

當按下螢幕電源開關，再次點亮螢幕，發現Dialog半透明的灰暗背景消失了.....

解決方案：設定window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);修改後如下：

// 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螢幕電源，原先變暗的背景變白色window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);alertDialog.setContentView(layout);

Android之Dialog半透明背景消失