Hello all, I am writing my first fully fragment-based app, which should show multiple master/detail levels, basically as the google mail app does. I did not find any applicable examples online, and my experiments so far have failed, so I am asking this here:
My app is currently only targeting tablets with the ability to show multiple fragments. It basically navigates 2 trees, switching between the trees via tabs. Each tree has multiple levels, of which I want to show 2 at a time. On the left side, there will be the usual list, and on the right side there will be either some kind of list (if the leaf level has not been reached), or some kind of leaf detail page. My understanding so far is, that I will have to manage the position in the tree, and the display of the appropriate fragments. This means the activity will replace the fragment (remove + add) for the current detail level, and reinitialize the left list fragment with new content. I started out by creating a layout XML with 2 fragments. I then went on trying to replace them with other fragments when switching tabs. With this, I get very strange results. When removing the details fragment and adding a new one, the removed one still shows on screen. When removing the left list fragment, I get a NullPointerException in a paint routine that queries the removed list fragment for its activity, which is null. My question: is my overall approach correct? What am I doing wrong? Can XML-based fragment layouts be manipulated in code via fragmentTransaction? Does anyone know sample code for the kind of scenario I am describing? thanks in advance, chris -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
