如何设置ListFragment的ListView的样式

时间:2012-07-30 20:34:19

标签: android listview android-listfragment

我想保留这些方法:

setListShown(true);
setListShownNoAnimation(true);

但如果我使用

onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)

使用自定义样式布局来扩充Fragment,以前的方法无法使用,并显示此异常:

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)

那么,可能的解决方案是什么?

编辑:

Fragment使用加载程序从数据库填充其ListView。所以这就是我想保留这些方法的原因,这里需要它们:

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

最简单的解决方案是基于ListFragment源创建自己的代码,并将进度窗口小部件添加到布局以显示相同的效果。到现在为止,我会删除这些行,因为我被告知。如果我进行修改,我会将其粘贴在这里。

4 个答案:

答案 0 :(得分:17)

只需将原始ListView替换为CustomListView中的onCreateView()版面。为我工作。

@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;
}

答案 1 :(得分:8)

我尝试过这个解决方案并且有效:

support ListFragment源代码中说,

  

如果您使用自己的自定义内容覆盖此方法,   考虑在布局中包含标准布局android.R.layout   文件,以便您继续保留所有标准行为   ListFragment。特别是,这是目前唯一的方法   显示内置的不确定进展状态。

所以,我已经采用了list_content.xml并将其应用于我自己的样式:

<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>

然后从支持源代码复制了一个固定的ListFragment

  • 我重命名了一些ID以匹配XML文件中的ID。
  • 删除其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);
        }   
    }
    

在那之后,一切都变得完美。 在创建Fragment时,只需对此list_content.xml进行充气。

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

答案 2 :(得分:0)

另一个对我有用的解决方案就是放这行

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

而不是ListView。

您可以在其上构建自己的内容或使用其他一些视图将其包围。例如,以下是我的布局:

<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>

答案 3 :(得分:-1)

支持包不支持

setListShown(true);setListShownNoAnimation(true);,仅适用于Api Level 11+。您要么放弃支持&lt; = Api等级10(选择不当),要么删除线。

如果我正确理解documentation您无需设置它们,因为true是默认值