1

据我所知,这可能是因为我的 ListView 没有显示,我已经验证 getCount 返回的值不为零,但我看不出我做错了什么。

一切都加载并表现得好像它正在工作但ListView从未出现,我在mixed.xml中的片段引用上放置了一个背景颜色,它在那里并占据了全屏,但是当我在我的ListView上设置背景颜色时它没有出现,就好像它根本没有被渲染。

更奇怪的是,我的适配器中没有调用 getView,这是我移植到片段的常规活动的所有工作代码。

我试过调用notifyDataSetChanged,它没有改变任何东西,调试显示适配器充满了数据,getCount确实返回了一个大于0的准确计数。

感谢您的帮助,我被卡住了。

项目是开放的,可以在这里查看http://code.google.com/p/shack-droid/source/browse/#svn%2FTrunk但我也在这里包括相关代码。

这是 ListFragment:

    public class FragmentTopicView extends ListFragment implements ShackGestureEvent {

        private ArrayList<ShackPost> posts;
        private String storyID = null;

        private String errorText = "";
        private Integer currentPage = 1;
        private Integer storyPages = 1;
        private String loadStoryID = null;
        private Boolean threadLoaded = true;
        private Hashtable<String, String> postCounts = null;
        private AdapterLimerifficTopic tva;

        public FragmentTopicView() {

        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
                // TODO Auto-generated method stub
                super.onCreate(savedInstanceState);

                this.setRetainInstance(true);
        }

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

                return inflater.inflate(R.layout.topics, null);
        }

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

                final ShackGestureListener listener = Helper.setGestureEnabledContentView(R.layout.topics, getActivity());
                if (listener != null) {
                        listener.addListener(this);
                }

                if (savedInstanceState == null) {
                        // get the list of topics
                        GetChattyAsyncTask chatty = new GetChattyAsyncTask(getActivity());
                        chatty.execute();
                }

                ListView lv = getListView();
                lv.setOnScrollListener(new OnScrollListener() {

                        @Override
                        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

                                // start loading the next page
                                if (threadLoaded && firstVisibleItem + visibleItemCount >= totalItemCount && currentPage + 1 <= storyPages) {

                                        // get the list of topics
                                        currentPage++;
                                        GetChattyAsyncTask chatty = new GetChattyAsyncTask(getActivity());
                                        chatty.execute();

                                }
                        }

                        @Override
                        public void onScrollStateChanged(AbsListView view, int scrollState) {

                        }

                });



        }



    class GetChattyAsyncTask extends AsyncTask<String, Void, Void> {
                protected ProgressDialog dialog;
                protected Context c;

                public GetChattyAsyncTask(Context context) {
                        this.c = context;
                }

                @Override
                protected Void doInBackground(String... params) {

                        threadLoaded = false;

                        try {
                                final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);
                                final String feedURL = prefs.getString("shackFeedURL", getString(R.string.default_api));
                                final URL url;

                                if (loadStoryID != null) {
                                        if (currentPage > 1)
                                                url = new URL(feedURL + "/" + loadStoryID + "." + currentPage.toString() + ".xml");
                                        else
                                                url = new URL(feedURL + "/" + loadStoryID + ".xml");
                                }
                                else {
                                        if (currentPage > 1)
                                                url = new URL(feedURL + "/" + storyID + "." + currentPage.toString() + ".xml");
                                        else
                                                url = new URL(feedURL + "/index.xml");
                                }

                                // Get a SAXParser from the SAXPArserFactory.
                                final SAXParserFactory spf = SAXParserFactory.newInstance();
                                final SAXParser sp = spf.newSAXParser();

                                // Get the XMLReader of the SAXParser we created.
                                final XMLReader xr = sp.getXMLReader();
                                // Create a new ContentHandler and apply it to the XML-Reader
                                SaxHandlerTopicView saxHandler = new SaxHandlerTopicView(c, "topic");

                                xr.setContentHandler(saxHandler);

                                // Parse the xml-data from our URL.
                                xr.parse(new InputSource(HttpHelper.HttpRequestWithGzip(url.toString(), c)));

                                // Our ExampleHandler now provides the parsed data to us.
                                if (posts == null) {
                                        posts = saxHandler.GetParsedPosts();
                                }
                                else {
                                        ArrayList<ShackPost> newPosts = saxHandler.GetParsedPosts();
                                        newPosts.removeAll(posts);
                                        posts.addAll(posts.size(), newPosts);

                                }

                                storyID = saxHandler.getStoryID();

                                storyPages = saxHandler.getStoryPageCount();

                                if (storyPages == 0) // XML returns a 0 for stories with only
                                                                                // one page
                                        storyPages = 1;

                        }
                        catch (Exception ex) {
                                // TODO: implement error handling

                        }

                        return null;
                }

                @Override
                protected void onPreExecute() {
                        super.onPreExecute();

                        if (currentPage == 1)
                                dialog = ProgressDialog.show(getActivity(), null, "Loading Chatty", true, true);
                        else
                                SetLoaderVisibility(View.VISIBLE);
                }

                @Override
                protected void onPostExecute(Void result) {
                        super.onPostExecute(result);

                        ShowData();

                        SetLoaderVisibility(View.GONE);

                        try {
                                dialog.dismiss();
                        }
                        catch (Exception e) {
                        }

                }

        }



     private void ShowData() {

                if (posts != null) {
                        Hashtable<String, String> tempHash = null;

                        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
                        final String login = prefs.getString("shackLogin", "");
                        final int fontSize = Integer.parseInt(prefs.getString("fontSize", "12"));

                        try {
                                postCounts = GetPostCache();
                        }
                        catch (Exception ex) {

                        }
                        if (postCounts != null)
                                tempHash = new Hashtable<String, String>(postCounts);

                        if (tva == null) {
                                tva = new AdapterLimerifficTopic(getActivity(), R.layout.lime_topic_row, posts, login, fontSize, tempHash);
                                setListAdapter(tva);
                        }
                        else {
                                tva.SetPosts(posts);
                                tva.notifyDataSetChanged();
                        }

                        final ListView lv = getListView();
                        lv.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
                                @Override
                                public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
                                        menu.setHeaderTitle("Options");
                                        menu.add(0, 1, 0, "Copy Post Url to Clipboard");
                                        menu.add(0, 2, 0, "Watch Thread");
                                        menu.add(0, 3, 0, "Thread Expires In?");
                                        menu.add(0, 4, 0, "Shacker's Chatty Profile");
                                }
                        });

                        // update the reply counts for the listing of topics
                        try {
                                UpdatePostCache();

                        }
                        catch (Exception e) {

                        }

                }
                else {
                        if (errorText.length() > 0) {

                                try {
                                        new AlertDialog.Builder(getActivity()).setTitle("Error").setPositiveButton("OK", null).setMessage(errorText).show();
                                }
                                catch (Exception ex) {
                                        // could not create a alert for the error for one reason
                                        // or another
                                        Log.e("ShackDroid", "Unable to create error alert ActivityTopicView:468");
                                }
                        }
                }
                threadLoaded = true;
        }

}

这是我的片段活动:

  public class FragmentActivityTopic extends FragmentActivity {
        @Override
        protected void onCreate(Bundle arg) {
                // TODO Auto-generated method stub
                super.onCreate(arg);

                setContentView(R.layout.mixed);
        }
}

这是我正在使用的适配器,如上所述 getView 没有被调用:

public class AdapterLimerifficTopic extends BaseAdapter {

        // private Context context;
        private List<ShackPost> topicList;
        private final int rowResouceID;
        private final String shackLogin;
        private final Typeface face;
        private final int fontSize;
        private final Hashtable<String, String> postCache;
        private final String showAuthor;
        private final Resources r;
        private int totalNewPosts = 0;

        LayoutInflater inflate;// = LayoutInflater.from(context);

        public AdapterLimerifficTopic(Context context, int rowResouceID, List<ShackPost> topicList, String shackLogin, int fontSize, Hashtable<String, String> postCache) {
                this.topicList = topicList;
                this.rowResouceID = rowResouceID;
                this.shackLogin = shackLogin;
                this.fontSize = fontSize;
                this.postCache = postCache;
                this.r = context.getResources();

                face = Typeface.createFromAsset(context.getAssets(), "fonts/arial.ttf");

                final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
                showAuthor = prefs.getString("showAuthor", "count");

                inflate = LayoutInflater.from(context);
        }
        public void SetPosts(List<ShackPost> posts)
        {
                topicList = posts;
        }
        @Override
        public int getCount() {
                return topicList.size();
        }

        @Override
        public Object getItem(int position) {
                return topicList.get(position);
        }

        @Override
        public long getItemId(int position) {
                // return position;
                final ShackPost post = topicList.get(position);
                return Long.parseLong(post.getPostID());
        }

        static class ViewHolder {
                TextView posterName;
                TextView datePosted;
                TextView replyCount;
                TextView newPosts;
                TextView postText;
                TextView viewCat;
                RelativeLayout topicRow;
                ImageView postTimer;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

                // TextView tmp;
                // final View v;
                ViewHolder holder;
                final ShackPost post = topicList.get(position);

                if (convertView == null) {
                        convertView = inflate.inflate(rowResouceID, parent, false);
                        holder = new ViewHolder();
                        holder.posterName = (TextView) convertView.findViewById(R.id.TextViewLimeAuthor);
                        holder.datePosted = (TextView) convertView.findViewById(R.id.TextViewLimePostDate);
                        holder.replyCount = (TextView) convertView.findViewById(R.id.TextViewLimePosts);
                        holder.newPosts = (TextView) convertView.findViewById(R.id.TextViewLimeNewPosts);
                        holder.postText = (TextView) convertView.findViewById(R.id.TextViewLimePostText);
                        holder.viewCat = (TextView) convertView.findViewById(R.id.TextViewLimeModTag);
//                      holder.topicRow = (RelativeLayout) convertView.findViewById(R.id.TopicRow);
//                      holder.postTimer = (ImageView) convertView.findViewById(R.id.ImageViewTopicTimer);

//                      holder.posterName.setTypeface(face);
//                      holder.datePosted.setTypeface(face);
//                      holder.replyCount.setTypeface(face);
//                      holder.newPosts.setTypeface(face);
                        holder.postText.setTextSize(TypedValue.COMPLEX_UNIT_SP, fontSize);
//                      holder.postText.setTypeface(face);

                        convertView.setTag(holder);
                }
                else {
                        holder = (ViewHolder) convertView.getTag();
                }

//              holder.postTimer.setImageResource(Helper.GetTimeLeftDrawable(post.getPostDate()));
//
                holder.posterName.setText(post.getPosterName());
//
//              if (shackLogin.equalsIgnoreCase(post.getPosterName()))
//                      holder.posterName.setTextColor(Color.parseColor("#00BFF3"));
//              else
//                      holder.posterName.setTextColor(Color.parseColor("#ffba00"));
//
                holder.datePosted.setText(Helper.FormatShackDateToTimePassed(post.getPostDate()));

                holder.replyCount.setText(post.getReplyCount());
//
//              if (showAuthor.equalsIgnoreCase("count") && post.getIsAuthorInThread())
//                      holder.replyCount.setTextColor(Color.parseColor("#0099CC"));
//              else
//                      holder.replyCount.setTextColor(Color.parseColor("#FFFFFF"));
// clipped code
                holder.postText.setText(preview);


//              if (showAuthor.equalsIgnoreCase("topic") && post.getIsAuthorInThread()) {
//                      final Drawable d = r.getDrawable(R.drawable.background_gradient_blue);
//                      holder.topicRow.setBackgroundDrawable(d);
//              }
//              else
//                      holder.topicRow.setBackgroundDrawable(null);


                // TODO: clean this up a little / also replicated in ShackDroidThread ick
                final String postCat = post.getPostCategory();
                holder.viewCat.setVisibility(View.VISIBLE);

                if (postCat.equals("offtopic"))  {
                        holder.viewCat.setText("offtopic");
                        holder.viewCat.setBackgroundColor(Color.parseColor("#444444"));
                }
                else if (postCat.equals("nws")) {
                        holder.viewCat.setText("nws");
                        holder.viewCat.setBackgroundColor(Color.parseColor("#CC0000"));
                }
                else if (postCat.equals("political")) {
                        holder.viewCat.setText("political");
                        holder.viewCat.setBackgroundColor(Color.parseColor("#FF8800"));
                }
                else if (postCat.equals("stupid")) {
                        holder.viewCat.setText("stupid");
                        holder.viewCat.setBackgroundColor(Color.parseColor("#669900"));
                }
                else if (postCat.equals("informative")) {
                        holder.viewCat.setText("interesting");
                        holder.viewCat.setBackgroundColor(Color.parseColor("#0099CC"));
                }
                else 
                        holder.viewCat.setVisibility(View.GONE);                


                return convertView;
        }

        public int getTotalNewPosts() {
                return totalNewPosts;
        }

}

以及相关的 XML:

mixed.xml(这是片段的布局,目前只有一个)

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" 
    android:id="@+id/LinearLayoutMixed">

    <fragment
        android:id="@+id/MixedThreads"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        class="com.stonedonkey.shackdroid.FragmentTopicView"
        >
    </fragment>

</LinearLayout>

Topics.xml(这包含 ListView 以及滑动托盘和其他一些东西。

 <?xml version="1.0" encoding="utf-8"?>
        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"  >

            <ListView
                android:id="@android:id/list"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_above="@+id/TopicLoader"
                android:divider="#333333"
                android:dividerHeight="1dip"
                android:textColor="#FFFFFF"

                 />

            <RelativeLayout
                android:id="@+id/TopicLoader"
                android:layout_width="fill_parent"
                android:layout_height="35dip"
                android:layout_alignParentBottom="true"
                android:gravity="center_horizontal"
                android:visibility="gone"
                android:layout_marginTop="5dip" >

                <TextView
                    android:id="@+id/TextViewTopicLoaderText"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:focusable="false"
                    android:focusableInTouchMode="false"
                    android:text="Loading" 

                    >
                </TextView>

                <ImageView
                    android:id="@+id/ImageViewTopicLoader"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_toRightOf="@+id/TextViewTopicLoaderText"
                    android:src="@drawable/ic_action_refresh"
                    android:layout_alignBottom="@+id/TextViewTopicLoaderText"
                     />
            </RelativeLayout>

            <SlidingDrawer
                android:id="@+id/SlidingDrawer01"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_below="@+id/TopicLoader"
                android:animateOnClick="true"
                android:content="@+id/bookMarkParent"
                android:handle="@+id/TextViewTrayHandle"
                android:orientation="vertical"
                android:paddingTop="200dip"
                android:visibility="gone" >

                <TextView
                    android:id="@+id/TextViewTrayHandle"
                    android:layout_width="fill_parent"
                    android:layout_height="35dip"
                    android:background="@drawable/darkgrey_gradient"
                    android:focusable="false"
                    android:focusableInTouchMode="false"
                    android:gravity="center_vertical" >
                </TextView>

                <RelativeLayout
                    android:id="@id/bookMarkParent"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" >

                    <ListView
                        android:id="@+id/ListViewWatchedThreads"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"
                        android:divider="#333333"
                        android:dividerHeight="1dip"
                        android:textColor="#FFFFFF" >
                    </ListView>
                </RelativeLayout>
            </SlidingDrawer>

        </RelativeLayout>

最后是lime_topic_row,这是我在上面布局中的ListView的自定义行布局:

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:background="#FF0000" >

        <TextView
            android:id="@+id/TextViewLimeModTag"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#FF0000"
            android:layout_alignParentLeft="true"
            android:layout_marginLeft="10dip"
            android:textColor="#000000"
            android:padding="2dip"
            android:textSize="10dip"
            />    
        <TextView
            android:id="@+id/TextViewLimePostText"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:minHeight="20dip"
            android:padding="10dip"
            android:layout_below="@+id/TextViewLimeModTag"
            android:textColor="#FFFFFF" />

        <TextView
            android:id="@+id/TextViewLimeAuthor"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/TextViewLimePostText"
            android:paddingBottom="10dip"
            android:paddingLeft="10dip"
            android:textColor="#0099CC" />

        <TextView
            android:id="@+id/TextViewPosted"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/TextViewLimePostText"
            android:layout_toRightOf="@+id/TextViewLimeAuthor"
            android:paddingBottom="10dip"
            android:text=" posted " />

        <TextView
            android:id="@+id/TextViewLimePostDate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/TextViewLimePostText"
            android:layout_toRightOf="@+id/TextViewPosted"
            android:paddingBottom="10dip"
            android:paddingRight="10dip"
            android:textColor="#FF8800" />



        <TextView
            android:id="@+id/TextViewLimePosts"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/TextViewLimePostDate"
            android:layout_marginRight="3dip"
            android:layout_below="@+id/TextViewLimePostText"
            android:layout_marginBottom="15dip"
            android:layout_toLeftOf="@+id/TextViewLimeNewPosts"
            android:background="#BBBBBB"
            android:padding="3dip"
            android:minWidth="25dip"
            android:gravity="center"
            android:textColor="#000000" />

        <TextView
            android:id="@+id/TextViewLimeNewPosts"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/TextViewLimePostDate"
            android:layout_below="@+id/TextViewLimePostText"
            android:layout_marginBottom="15dip"
            android:layout_marginRight="10dip"
            android:background="#669900"
            android:padding="3dip"
            android:minWidth="25dip"
            android:gravity="center"
            android:layout_alignParentRight="true"
            android:textColor="#000000" />

    </RelativeLayout>
4

1 回答 1

1

我想我找到了问题所在。出现此问题的原因是您在方法ShackGestureListener开始时设置了以下内容:onActivityCreatedFragmentTopicView

final ShackGestureListener listener = Helper.setGestureEnabledContentView(R.layout.topics, getActivity());
if (listener != null) {
    listener.addListener(this);
}

在该setGestureEnabledContentView()方法中,您检查用户是否在首选项中启用了手势,或者 android 版本是否大于 3。无论哪种方式,true或者您再次false设置内容视图(使用 的布局)。不幸的是,再次设置内容视图将覆盖包含 数据的当前布局(填充没有问题)。当您运行它们以获取数据时,最后您将数据设置为正确的(由你盖这个。FragmentActivityTopic FragmentTopicViewListViewListViewAsyncTasksListViewgetListViewgetListViewListViewonCreateViewsetGestureEnabledContentViewListView

如果您简单地注释掉(或删除)为HelperHelperAPI4类中的活动设置内容视图的行,则此行为很容易看出。另一种查看您ListView是否被覆盖的方法是,例如使用和使用(我已经在选择您的一个菜单项时完成此操作,因此我可以控制何时更换适配器ListViewgetListViewgetActivity().findViewById(android.R.id.list)

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    Intent intent;
    switch (item.getItemId())
    {
    case R.id.topic_menu_newpost: // Launch post form
//this doesn't work as the getListView will return a reference to the old ListView
ListView lv = getListView();
lv.setAdapter(tva);
// this will work as you get a reference to the new ListView on top
ListView lv = (ListView) getActivity().findViewById(android.R.id.list);
lv.setAdapter(tva);

我不知道推荐什么作为解决方案,因为我不太明白你在做什么,但我怀疑它需要再次为活动设置内容视图(你应该从这个开始工作)。

于 2012-07-20T19:29:20.417 回答