Android 實戰記錄 (7) - PopupWindow in Custom ActionBar Item

這次是要模擬客製化ActionBar 上的 Icon 按下去後，會跳出
像PopupMenu在Icon的下左方一點點顯示一排Menu

試滿久終於給我試出來了。以下是程式碼。

抄東抄西，終於有一個比較像樣的了

private PopupWindow popupWindow = null;

private void initPopupWindow() {
   LayoutInflater layoutInflater =(LayoutInflater)getBaseContext().getSystemService(LAYOUT_INFLATER_SERVICE);
   View popupView = layoutInflater.inflate(R.layout.popup_setting, null);
   popupWindow = new PopupWindow(popupView,
         ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

   popupView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
   int xOffset = -(popupView.getMeasuredWidth() - popupView.getWidth());

   // 使其聚集   popupWindow.setFocusable(true);
   // 设置允许在外点击消失   popupWindow.setOutsideTouchable(true);
   //刷新状态（必须刷新否则无效）   popupWindow.update();
   popupWindow.showAsDropDown(btn_setting, xOffset + 70, -10);
}