#back stack

Navigation in Windows Phone apps http://wtuts.me/Navigation #wpdev

Silverlight

To navigate to another page in a WP Silverlight app, using the following code.

To pass information between pages, save an object in a state like so,

On the navigated page in the constructor, use the following code to retrieve the object.

To view the pages in the back stack, use the following code.

To remove the previous page from the stack, which is useful after a user has logged in &…

在android版本時常的更新的現今，許多程式的寫程也開始有些轉變，之前就有提到目前官方已經開始希望開發者用fragment來取代activity。

所以在所難免常常會有在fragment之間切換來切換去，並且加入到FragmentManager的backstack，以方便按下back按鍵時，可以返回前一個fragemnt。

但是如果為了好的使用者體驗，希望在程式運作到某一個情境時，清除所有的back stack entry，讓使用者不要在按下back按鍵時，發生一些悲劇體驗的話，你可以利用程式碼來清除back stack entry

// In your FragmentActivity use getSupprotFragmentManager() to get the FragmentManager. // Clear all back stack. int backStackCount = getSupportFragmentManager().getBackStackEntryCount(); for (int i = 0; i < backStackCount; i++) { // Get the back stack fragment id. int backStackId = getSupportFragmentManager().getBackStackEntryAt(i).getId(); fm.popBackStack(backStackId, FragmentManager.POP_BACK_STACK_INCLUSIVE); } /* end of for */