抽屉式布局和多窗格布局

Question

我的应用程序使用多面板布局来显示一个任务列表。每个Assignment可以放在一个AssignmentCategory中。我想使用DrawerLayout来显示所有的AssignmentCategories，使用户可以轻松地在不同类别之间切换。

但是我无法创建这样的布局。在DrawerLayout教程中，当用户点击一个项目（在我的情况下是一个AssignmentCategory）时，DrawerLayoutActivity将替换一个Fragment。而我使用的多面板布局需要一个FragmentActivity。我不知道如何创建一个包含多面板布局的Fragment。有人能做到吗？

- ObAt

Answer 1

将这两个项目合并起来不应该太难。在示例代码中，DrawerLayout示例确实替换了内容片段，但您不必做同样的事情，您可以简单地更新相同的片段以显示正确的数据。您可以按以下方式实现这两个项目：

• start from the multi pane demo project.
• update the two activities of the multi pane demo to extends ActionBarActivity(v7), you don't need to extend FragmentActivity
• implement the DrawerLayout(the sample code from the drawer project) code in the start list activity(I'm assuming you don't want the DrawerLayout in the details activity, but implementing it shouldn't be a problem if you want it).

• the layout of the start list activity will be like this(don't forget that you need to implement the DrawerLayout changes in the activity_item_twopane.xml as well!):

  <DrawerLayout>
       <fragment android:id="@+id/item_list" .../>
       <ListView /> <!-- the list in the DrawerLayout-->
  </DrawerLayout>
  

• change the implementation DrawerItemClickListener so when the user clicks the drawer list item you don't create and add a new list fragment, instead you update the single list fragment from the layout:

  AssignmentListFragment alf = (AssignmentListFragment) getSupportFragmentManager()
          .findFragmentById(R.id.item_list);
  if (alf != null && alf.isInLayout()
          && alf.getCurrentDisplayedCategory() != position) {
      alf.updateDataForCategory(position); // the update method
      setTitle(DummyContent.CATEGORIES[alf.getCurrentDisplayedCategory()]);
  }
  

• the update method would be something like this:

  /**
  * This method update the fragment's adapter to show the data for the new
  * category
  * 
      * @param category
      *            the index in the DummyContent.CATEGORIES array pointing to the
  *            new category
  */
  public void updateDataForCategory(int category) {
      mCurCategory = category;
      String categoryName = DummyContent.CATEGORIES[category];
      List<DummyContent.Assigment> data = new ArrayList<Assigment>(
          DummyContent.ITEM_MAP.get(categoryName));
      mAdapter.clear(); // clear the old dsata and add the new one!
      for (Assigment item : data) {
              mAdapter.add(item);
      }
  }
  
  public int getCurrentDisplayedCategory() {
          return mCurCategory;
  }
  

  -various other small changes

我已经制作了一个样例项目来说明上述更改，你可以在这里找到。

- user