如何樣式

Question

我想保持這些方法的ListFragment的ListView控件：

setListShown(true); 
setListShownNoAnimation(true); 

，但如果我用

onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 

膨脹的Fragment使用自定義風格的佈局，以前的方法可以不會被使用，並且顯示出這個例外：

07-30 20:17:46.937: E/AndroidRuntime(1374): Caused by: java.lang.IllegalStateException: Can't be used with a custom content view 
07-30 20:17:46.937: E/AndroidRuntime(1374):  at android.support.v4.app.ListFragment.setListShown(ListFragment.java:282) 
07-30 20:17:46.937: E/AndroidRuntime(1374):  at android.support.v4.app.ListFragment.setListShown(ListFragment.java:258) 

那麼，有什麼可能的解決方案呢？

編輯：

的Fragment使用裝載機的ListView從數據庫填充。所以這就是爲什麼我想保持這些方法的原因，他們需要在這裏：

public void onLoadFinished(Loader<Cursor> loader, Cursor data) { 
     mAdapter.swapCursor(data); 
     if (isResumed()) { 
      setListShown(true); 
     } else { 
      setListShownNoAnimation(true); 
     } 
    } 

最簡單的解決方案是基於ListFragment源，以使自己的代碼，也進步小部件添加到佈局以顯示相同的效果。到現在爲止，我會按照我的說法刪除這些行。如果我做了修改，我會在這裏粘貼它。

Answer 1

剛剛與onCreateView()在您CustomListView佈局取代原來的ListView。爲我工作。

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View layout = super.onCreateView(inflater, container, 
      savedInstanceState); 
    ListView lv = (ListView) layout.findViewById(android.R.id.list); 
    ViewGroup parent = (ViewGroup) lv.getParent(); 

    // Remove ListView and add CustomView in its place 
    int lvIndex = parent.indexOfChild(lv); 
    parent.removeViewAt(lvIndex); 
    LinearLayout mLinearLayout = (LinearLayout) inflater.inflate(
      R.layout.custom_list, container, false); 
    parent.addView(mLinearLayout, lvIndex, lv.getLayoutParams()); 
    return layout; 
} 

Answer 2

setListShown(true);和setListShownNoAnimation(true);不受支持包的支持，僅適用於Api Level 11+。您必須放棄< = Api級別10（不良選擇）的支持或刪除線路。

如果我理解正確的documentation您不必設置它們反正因爲true是默認值

Answer 3

我試過這個解決方案，它的工作原理：

在support ListFragment源代碼中說，

如果你重寫此方法與自己的自定義內容， 考慮在你的佈局 文件的標準佈局android.R.layout，所以塔您繼續保留ListFragment的所有標準行爲 。特別是，這是目前唯一能夠顯示內置不確定進度狀態的方法。

所以，我已經採取了list_content.xml並應用到列表我自己的風格：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     style="@style/page_background"> 

    <LinearLayout android:id="@+id/progressContainer" 
      android:orientation="vertical" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:visibility="gone" 
      android:gravity="center"> 

     <ProgressBar style="?android:attr/progressBarStyleLarge" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" /> 
     <TextView android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:paddingTop="4dip" 
       android:singleLine="true" /> 

    </LinearLayout> 

    <FrameLayout android:id="@+id/listContainer" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

     <ListView android:id="@android:id/list" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:drawSelectorOnTop="false" 
       style="@style/rc_listview"/> 
     <TextView android:id="@android:id/empty" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:gravity="center" 
       android:textAppearance="?android:attr/textAppearanceLarge" /> 
    </FrameLayout> 

</FrameLayout> 

然後做了一個固定的ListFragment從支持源代碼複製。

• 我重命名了一些ID以匹配XML文件中的ID。

• 刪除其onCreateView()。

  public class FixedListFragment extends Fragment { 
  
      final private Handler mHandler = new Handler(); 
  
      final private Runnable mRequestFocus = new Runnable() { 
       public void run() { 
        mList.focusableViewAvailable(mList); 
       } 
      }; 
  
      final private AdapterView.OnItemClickListener mOnClickListener 
        = new AdapterView.OnItemClickListener() { 
       public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 
        onListItemClick((ListView)parent, v, position, id); 
       } 
      }; 
  
      ListAdapter mAdapter; 
      ListView mList; 
      View mEmptyView; 
      TextView mStandardEmptyView; 
      View mProgressContainer; 
      View mListContainer; 
      CharSequence mEmptyText; 
      boolean mListShown; 
  
      public FixedListFragment() { 
      } 
  
      /** 
      * Provide default implementation to return a simple list view. Subclasses 
      * can override to replace with their own layout. If doing so, the 
      * returned view hierarchy <em>must</em> have a ListView whose id 
      * is {@link android.R.id#list android.R.id.list} and can optionally 
      * have a sibling view id {@link android.R.id#empty android.R.id.empty} 
      * that is to be shown when the list is empty. 
      * 
      * <p>If you are overriding this method with your own custom content, 
      * consider including the standard layout {@link android.R.layout#list_content} 
      * in your layout file, so that you continue to retain all of the standard 
      * behavior of ListFragment. In particular, this is currently the only 
      * way to have the built-in indeterminant progress state be shown. 
      */ 
  
      /** 
      * Attach to list view once the view hierarchy has been created. 
      */ 
      @Override 
      public void onViewCreated(View view, Bundle savedInstanceState) { 
       super.onViewCreated(view, savedInstanceState); 
       ensureList(); 
      } 
  
      /** 
      * Detach from list view. 
      */ 
      public void onDestroyView() { 
       mHandler.removeCallbacks(mRequestFocus); 
       mList = null; 
       mListShown = false; 
       mEmptyView = mProgressContainer = mListContainer = null; 
       mStandardEmptyView = null; 
       super.onDestroyView(); 
      } 
  
      /** 
      * This method will be called when an item in the list is selected. 
      * Subclasses should override. Subclasses can call 
      * getListView().getItemAtPosition(position) if they need to access the 
      * data associated with the selected item. 
      * 
      * @param l The ListView where the click happened 
      * @param v The view that was clicked within the ListView 
      * @param position The position of the view in the list 
      * @param id The row id of the item that was clicked 
      */ 
      public void onListItemClick(ListView l, View v, int position, long id) { 
      } 
  
      /** 
      * Provide the cursor for the list view. 
      */ 
      public void setListAdapter(ListAdapter adapter) { 
       boolean hadAdapter = mAdapter != null; 
       mAdapter = adapter; 
       if (mList != null) { 
        mList.setAdapter(adapter); 
        if (!mListShown && !hadAdapter) { 
         // The list was hidden, and previously didn't have an 
         // adapter. It is now time to show it. 
         setListShown(true, getView().getWindowToken() != null); 
        } 
       } 
      } 
  
      /** 
      * Set the currently selected list item to the specified 
      * position with the adapter's data 
      * 
      * @param position 
      */ 
      public void setSelection(int position) { 
       ensureList(); 
       mList.setSelection(position); 
      } 
  
      /** 
      * Get the position of the currently selected list item. 
      */ 
      public int getSelectedItemPosition() { 
       ensureList(); 
       return mList.getSelectedItemPosition(); 
      } 
  
      /** 
      * Get the cursor row ID of the currently selected list item. 
      */ 
      public long getSelectedItemId() { 
       ensureList(); 
       return mList.getSelectedItemId(); 
      } 
  
      /** 
      * Get the activity's list view widget. 
      */ 
      public ListView getListView() { 
       ensureList(); 
       return mList; 
      } 
  
      /** 
      * The default content for a ListFragment has a TextView that can 
      * be shown when the list is empty. If you would like to have it 
      * shown, call this method to supply the text it should use. 
      */ 
      public void setEmptyText(CharSequence text) { 
       ensureList(); 
       if (mStandardEmptyView == null) { 
        throw new IllegalStateException("Can't be used with a custom content view"); 
       } 
       mStandardEmptyView.setText(text); 
       if (mEmptyText == null) { 
        mList.setEmptyView(mStandardEmptyView); 
       } 
       mEmptyText = text; 
      } 
  
      /** 
      * Control whether the list is being displayed. You can make it not 
      * displayed if you are waiting for the initial data to show in it. During 
      * this time an indeterminant progress indicator will be shown instead. 
      * 
      * <p>Applications do not normally need to use this themselves. The default 
      * behavior of ListFragment is to start with the list not being shown, only 
      * showing it once an adapter is given with {@link #setListAdapter(ListAdapter)}. 
      * If the list at that point had not been shown, when it does get shown 
      * it will be do without the user ever seeing the hidden state. 
      * 
      * @param shown If true, the list view is shown; if false, the progress 
      * indicator. The initial value is true. 
      */ 
      public void setListShown(boolean shown) { 
       setListShown(shown, true); 
      } 
  
      /** 
      * Like {@link #setListShown(boolean)}, but no animation is used when 
      * transitioning from the previous state. 
      */ 
      public void setListShownNoAnimation(boolean shown) { 
       setListShown(shown, false); 
      } 
  
      /** 
      * Control whether the list is being displayed. You can make it not 
      * displayed if you are waiting for the initial data to show in it. During 
      * this time an indeterminant progress indicator will be shown instead. 
      * 
      * @param shown If true, the list view is shown; if false, the progress 
      * indicator. The initial value is true. 
      * @param animate If true, an animation will be used to transition to the 
      * new state. 
      */ 
      private void setListShown(boolean shown, boolean animate) { 
       ensureList(); 
       if (mProgressContainer == null) { 
        throw new IllegalStateException("Can't be used with a custom content view"); 
       } 
       if (mListShown == shown) { 
        return; 
       } 
       mListShown = shown; 
       if (shown) { 
        if (animate) { 
         mProgressContainer.startAnimation(AnimationUtils.loadAnimation(
           getActivity(), android.R.anim.fade_out)); 
         mListContainer.startAnimation(AnimationUtils.loadAnimation(
           getActivity(), android.R.anim.fade_in)); 
        } else { 
         mProgressContainer.clearAnimation(); 
         mListContainer.clearAnimation(); 
        } 
        mProgressContainer.setVisibility(View.GONE); 
        mListContainer.setVisibility(View.VISIBLE); 
       } else { 
        if (animate) { 
         mProgressContainer.startAnimation(AnimationUtils.loadAnimation(
           getActivity(), android.R.anim.fade_in)); 
         mListContainer.startAnimation(AnimationUtils.loadAnimation(
           getActivity(), android.R.anim.fade_out)); 
        } else { 
         mProgressContainer.clearAnimation(); 
         mListContainer.clearAnimation(); 
        } 
        mProgressContainer.setVisibility(View.VISIBLE); 
        mListContainer.setVisibility(View.GONE); 
       } 
      } 
  
      /** 
      * Get the ListAdapter associated with this activity's ListView. 
      */ 
      public ListAdapter getListAdapter() { 
       return mAdapter; 
      } 
  
      private void ensureList() { 
       if (mList != null) { 
        return; 
       } 
       View root = getView(); 
       if (root == null) { 
        throw new IllegalStateException("Content view not yet created"); 
       } 
       if (root instanceof ListView) { 
        mList = (ListView)root; 
       } else { 
        mStandardEmptyView = (TextView)root.findViewById(android.R.id.empty); 
        if (mStandardEmptyView == null) { 
         mEmptyView = root.findViewById(android.R.id.empty); 
        } else { 
         mStandardEmptyView.setVisibility(View.GONE); 
        } 
        mProgressContainer = root.findViewById(R.id.progressContainer); 
        mListContainer = root.findViewById(R.id.listContainer); 
        View rawListView = root.findViewById(android.R.id.list); 
        if (!(rawListView instanceof ListView)) { 
         if (rawListView == null) { 
          throw new RuntimeException(
            "Your content must have a ListView whose id attribute is " + 
            "'android.R.id.list'"); 
         } 
         throw new RuntimeException(
           "Content has view with id attribute 'android.R.id.list' " 
           + "that is not a ListView class"); 
        } 
        mList = (ListView)rawListView; 
        if (mEmptyView != null) { 
         mList.setEmptyView(mEmptyView); 
        } else if (mEmptyText != null) { 
         mStandardEmptyView.setText(mEmptyText); 
         mList.setEmptyView(mStandardEmptyView); 
        } 
       } 
       mListShown = true; 
       mList.setOnItemClickListener(mOnClickListener); 
       if (mAdapter != null) { 
        ListAdapter adapter = mAdapter; 
        mAdapter = null; 
        setListAdapter(adapter); 
       } else { 
        // We are starting without an adapter, so assume we won't 
        // have our data right away and start with the progress indicator. 
        if (mProgressContainer != null) { 
         setListShown(false, false); 
        } 
       } 
       mHandler.post(mRequestFocus); 
      } 
  } 
  

在那之後，一切都完美。 創建Fragment時，只需使此list_content.xml充氣。

public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.list_content, container, false); 
    return view; 
} 

Answer 4

另一種解決方案是爲我工作也只是把此行

<include layout="@android:layout/list_content" /> 

，而不是你的ListView。

您可以在其上構建自己的內容或用其他視圖包圍它。例如，這裏是我的佈局看起來像：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" 
android:layout_width="match_parent" 
android:layout_height="match_parent" > 

<RelativeLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:padding="@dimen/default_view_padding" 
     android:gravity="center" 
     android:weightSum="4"> 

    <ImageButton 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/btnCounterBack" 
      android:src="?attr/ic_previous" 
      android:background="?android:attr/selectableItemBackground" 
      android:contentDescription="@null"/> 

    <TextView 
      android:id="@+id/tvCounterLevel" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceMedium" 
      android:text="@string/counter_categories" 
      android:layout_gravity="center" 
      android:paddingTop="@dimen/default_view_padding" 
      android:paddingBottom="@dimen/default_view_padding" 
      android:layout_alignParentTop="true" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:gravity="center"/> 

</RelativeLayout> 

<LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:gravity="center_vertical" 
     android:background="?attr/dropShadowBackground" 
     android:orientation="vertical" > 

    <include layout="@android:layout/list_content" /> 

</LinearLayout>