Cómo puede estilo de la ListView de un ListFragment

Question

quiero seguir estos métodos:

setListShown(true); 
setListShownNoAnimation(true); 

pero si uso

onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 

para inflar el Fragment con un diseño personalizado de estilo, los métodos anteriores se no se utilizará, y muestre esta excepción:

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) 

Entonces, ¿qué solución posible puede ser?

EDIT:

El Fragment utiliza un cargador para poblar su ListView a partir de una base de datos. Así que esa es la razón por la que quiero mantener esos métodos, se necesitan aquí:

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

La solución más fácil sería hacer mi propio código basado en la fuente ListFragment, una también agregar el widget de progreso a la disposición para mostrar el mismo efecto Por ahora, borraré esas líneas como me han dicho. Si hago la modificación, la pegaré aquí.

Answer 1

cambias el original ListView con su diseño CustomListView dentro del onCreateView(). Trabajó para mi.

@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); y setListShownNoAnimation(true); no son compatibles con el paquete de soporte y solo están disponibles en Api Level 11+. O bien debe abandonar el soporte de < = Api Level 10 (mala opción) o eliminar las líneas.

Si entiendo correctamente la documentation usted no tiene que fijar ellos de todos modos, porque true es el valor por defecto

Answer 3

He probado esta solución y funciona:

En el código fuente dice support ListFragment,

Si está sustituyendo este método con su propio contenido personalizado, considerar la inclusión de la disposición estándar android.R.layout en su archivo de diseño , por lo tha Si continúa manteniendo todo el comportamiento estándar de ListFragment. En particular, esta es actualmente la única forma de tener para mostrar el estado de progreso indeterminante incorporado.

lo tanto, me he tomado la list_content.xml y se aplica a la lista de mi propio estilo:

<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> 

Entonces hice una ListFragment fija copiada de código fuente de apoyo.

• Cambié el nombre de algunos identificadores para que coincidan con los que están en el archivo XML.

• Borrar es 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); 
      } 
  } 
  

Después de eso, todo va perfecto. Simplemente infle este list_content.xml al crear el Fragment.

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

Answer 4

Otra solución que funcionó para mí, así es sólo para poner esta línea

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

en lugar de su ListView.

Puede crear su propio contenido encima o rodearlo con algunas otras vistas. Por ejemplo, aquí es cómo mi diseño se parece a:

<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>