Question

在横向模式下，我的列表视图显示在屏幕左侧，而右侧显示为空白，应该如此。当用户单击某个项目时，详细信息显示在屏幕的右侧但是listivew消失。它似乎表现得像是在纵向模式，但它显然使用景观xml布局 - 土地。在查看了几十个示例后，我仍然无法将listview与详细信息一起保留在屏幕上。有人能指出我正确的方向吗？这是我的代码：

BookDetailsActivity：公共类BookDetailsActivity扩展了Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //** Getting the orientation ( Landscape or Portrait ) of the screen 
    int orientation = getResources().getConfiguration().orientation;

    //** Landscape Mode 
    if(orientation == Configuration.ORIENTATION_LANDSCAPE ){
      //setting the landscape layout for this activity
      setContentView(R.layout.buy_tbfrag);

      //get fragment manager for fragment related operations
      FragmentManager fm = getFragmentManager();

      //get fragment transaction object, which can add, move or replace a fragment
      FragmentTransaction ft = fm.beginTransaction();

      //getting the existing detailed fragment object, if it already exists.
      //the fragment object is retrieved by its tag name
      Fragment prevFrag = fm.findFragmentByTag("book.details");

      //System.out.println("prevFrag = " + prevFrag);
      //** Remove the existing detailed fragment object if it exists */
      if(prevFrag!=null) {
          ft.remove(prevFrag);
      }

      //instantiating the fragment BookDetailsFragment
      BookDetailsFragment detailsFragment = new BookDetailsFragment();

      //creating a bundle object to pass the data (clicked item's position)
      //from this activity to fragment
      Bundle b = new Bundle();

      //setting the data to the bundle object from the Intent
      b.putString("load the bundle objects);
        ...

      //setting the bundle object to the fragment
      detailsFragment.setArguments(b);

      //adding the fragment to the fragment transaction
      ft.add(R.id.details_fragment_container, detailsFragment,"book.details");

      //add the fragment transaction to backstack
      //ft.addToBackStack(null);

      //Executing the transaction
      ft.commit();

    } else {
    ...
    start Portrait mode code...
    }
}

Buy_tbfrg xml代码：

<LinearLayout
    android:layout_width="200dip"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="3dip" >

    <EditText
        android:id="@+id/titleSearch"
        android:layout_width="200dip"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dip"
        android:background="@drawable/rectangle_box"
        android:hint="@string/hint"
        android:padding="5dip"
        android:textStyle="italic" />

    <ListView
        android:id="@android:id/list"
        android:layout_width="200dip"
        android:layout_height="wrap_content" >
    </ListView>
</LinearLayout>

<FrameLayout
    android:id="@+id/details_fragment_container"
    android:layout_width="0dip"
    android:layout_height="match_parent"
    android:layout_weight="3.97" >

</FrameLayout>

</LinearLayout>

BookDetailsFragment：公共类BookDetailsFragment扩展Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) {

       View view = inflater.inflate(R.layout.book_details, null);

       System.out.println("BookDetailsFragment executed");

      //Defines the TextViews in R.layout.book_details
      TextView bkTitle = (TextView)view.findViewById(R.id.bookTitle);
      ...

      //Retrieve the bundle object passed from BuyFragTab
      Bundle b = getArguments();


      //Getting the item's clicked position and setting corresponding details     
      //First check the bundle to ensure the data has been passed
      if (b != null) {
         bkTitle.setText    ("Title: " + b.getString("Selected_Title"));
        ...
      }

    return view;
}

Answer 1

你使用装载机吗？在ListFragment或DetailFragment中启动或重新启动Loader时，请确保传递不同的数字（arg0）。

单击时，横向中的列表视图（双窗格）将消失

1 个答案: