近日,遇到一個Dialog半透明背景消失的問題,背景需求是自定義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,發現Dialog半透明的灰暗背景消失了.....

解決方法:設置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,小編會及時回復大家的!
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