android listfragment不顯示內容

Question

我一直試圖顯示在我的主fragmentActivity包含ListView的tabHost。 但是我的listView並沒有出現。元素正在上傳，但視圖不顯示它們。

這顯示tabHost

public class GestionListeNote extends Fragment implements OnTabChangeListener { 

private static final String TAG = "FragmentTabs"; 
public static final String TAB_ALL = "All"; 
public static final String TAB_TOPAY = "To Pay"; 
public static final String TAB_PAID = "Paid"; 
public static final String TAB_SEND = "Send"; 

private View mRoot; 
private TabHost mTabHost; 
private int mCurrentTab; 

@Override 
public void onAttach(Activity activity) { 
    super.onAttach(activity); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    mRoot = inflater.inflate(R.layout.tabs_fragment, null); 
    mTabHost = (TabHost) mRoot.findViewById(android.R.id.tabhost); 
    setupTabs(); 
    return mRoot; 
} 

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    setRetainInstance(true); 
    mTabHost.setOnTabChangedListener(this); 
    mTabHost.setCurrentTab(mCurrentTab); 
    // manually start loading stuff in the first tab 
    updateTab(TAB_ALL, R.id.tab_1); 
} 

private void setupTabs() { 
    mTabHost.setup(); // important! 
    mTabHost.addTab(newTab(TAB_ALL, R.string.allNotes, R.id.tab_1)); 
    mTabHost.addTab(newTab(TAB_TOPAY, R.string.notesToPay, R.id.tab_2)); 
    mTabHost.addTab(newTab(TAB_PAID, R.string.notesPaid, R.id.tab_3)); 
    mTabHost.addTab(newTab(TAB_SEND, R.string.notesSend, R.id.tab_4)); 
} 

private TabSpec newTab(String tag, int labelId, int tabContentId) { 
    Log.d(TAG, "buildTab(): tag=" + tag); 

    View indicator = LayoutInflater.from(getActivity()).inflate(
      R.layout.tab, 
      (ViewGroup) mRoot.findViewById(android.R.id.tabs), false); 
    ((TextView) indicator.findViewById(R.id.text)).setText(labelId); 

    TabSpec tabSpec = mTabHost.newTabSpec(tag); 
    tabSpec.setIndicator(indicator); 
    tabSpec.setContent(tabContentId); 
    return tabSpec; 
} 

@Override 
public void onTabChanged(String tabId) { 
    Log.d(TAG, "onTabChanged(): tabId=" + tabId); 
    if (TAB_ALL.equals(tabId)) { 
     updateTab(tabId, R.id.tab_1); 
     mCurrentTab = 0; 
     Log.d(TAG, "current tab=" + mCurrentTab); 
     return; 
    } 
    if (TAB_TOPAY.equals(tabId)) { 
     updateTab(tabId, R.id.tab_2); 
     mCurrentTab = 1; 
     Log.d(TAG, "current tab=" + mCurrentTab); 
     return; 
    } 
    if (TAB_PAID.equals(tabId)) { 
     updateTab(tabId, R.id.tab_3); 
     mCurrentTab = 2; 
     Log.d(TAG, "current tab=" + mCurrentTab); 
     return; 
    } 
    if (TAB_SEND.equals(tabId)) { 
     updateTab(tabId, R.id.tab_4); 
     mCurrentTab = 3; 
     Log.d(TAG, "current tab=" + mCurrentTab); 
     return; 
    } 
} 

private void updateTab(String tabId, int placeholder) { 
    FragmentManager fm = getFragmentManager(); 
    if (fm.findFragmentByTag(tabId) == null) { 
     fm.beginTransaction() 
     .replace(placeholder, new ListeNotesFragment(tabId), tabId) 
     .commit(); 
    } 
} 

這是我ListFragment誰顯示我的元素的片段

public class ListeNotesFragment extends ListFragment implements 
    LoaderCallbacks<Void> { 

private static final String TAG = "FragmentTabs"; 

private String mTag; 
private MyAdapter mAdapter; 
private ArrayList<String> mItems; 
private LayoutInflater mInflater; 
private int mTotal; 
private int mPosition; 

private static final String[] All = { "Lorem", "ipsum", "dolor", "sit", 
    "amet", "consectetur", "adipiscing", "elit", "Fusce", "pharetra", 
    "luctus", "sodales" }; 
private static final String[] ToPay = { "I", "II", "III", "IV", "V", 
    "VI", "VII", "VIII", "IX", "X", "XI", "XII", "XIII", "XIV", "XV" }; 
private static final String[] Paid = { "Test" }; 
private static final String[] Send = { "Test" }; 

private static final int SLEEP = 1000; 

private final int allBarColor = R.color.all_bar; 
private final int topayBarColor = R.color.topay_bar; 
private final int paidBarColor = R.color.paid_bar; 
private final int sendBarColor = R.color.send_bar; 

public ListeNotesFragment() { 
} 

public ListeNotesFragment(String tag) { 
    mTag = tag; 
    mTotal = GestionListeNote.TAB_ALL.equals(mTag) ? All.length 
      : (GestionListeNote.TAB_TOPAY.equals(mTag) ? ToPay.length 
        : (GestionListeNote.TAB_PAID.equals(mTag) ? Paid.length 
          : Send.length)); 
    Log.d(TAG, "mTotal =" + mTotal); 
    Log.d(TAG, "Constructor: tag=" + tag); 
} 

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    // this is really important in order to save the state across screen 
    // configuration changes for example 
    setRetainInstance(true); 

    mInflater = LayoutInflater.from(getActivity()); 

    // you only need to instantiate these the first time your fragment is 
    // created; then, the method above will do the rest 
    if (mAdapter == null) { 
     mItems = new ArrayList<String>(); 
     mAdapter = new MyAdapter(getActivity(), mItems); 
    } 
    getListView().setAdapter(mAdapter); 

    // initiate the loader to do the background work 
    getLoaderManager().initLoader(0, null, this); 
} 

@Override 
public Loader<Void> onCreateLoader(int id, Bundle args) { 
    AsyncTaskLoader<Void> loader = new AsyncTaskLoader<Void>(getActivity()) { 

     @Override 
     public Void loadInBackground() { 
      try { 
       // simulate some time consuming operation going on in the 
       // background 
       Thread.sleep(SLEEP); 
      } catch (InterruptedException e) { 
      } 
      return null; 
     } 
    }; 
    // somehow the AsyncTaskLoader doesn't want to start its job without 
    // calling this method 
    loader.forceLoad(); 
    Log.d(TAG, "Stop sleep"); 
    return loader; 
} 

@Override 
public void onLoadFinished(Loader<Void> loader, Void result) { 

    // add the new item and let the adapter know in order to refresh the 
    // views 

    mItems.add(GestionListeNote.TAB_ALL.equals(mTag) ? All[mPosition] 
      : (GestionListeNote.TAB_TOPAY.equals(mTag) ? ToPay[mPosition] 
        : (GestionListeNote.TAB_PAID.equals(mTag) ? Paid[mPosition] 
          : Send[mPosition]))); 
    mAdapter.notifyDataSetChanged(); 

    Log.d(TAG, "item =" + mItems.get(mPosition)); 

    // advance in your list with one step 
    mPosition++; 

    if (mPosition < mTotal - 1) { 
     getLoaderManager().restartLoader(0, null, this); 
     Log.d(TAG, "onLoadFinished(): loading next..."); 
    } else { 
     Log.d(TAG, "onLoadFinished(): done loading!"); 
    } 
} 

@Override 
public void onLoaderReset(Loader<Void> loader) { 
} 

private class MyAdapter extends ArrayAdapter<String> { 

    public MyAdapter(Context context, List<String> objects) { 
     super(context, R.layout.list_item, R.id.text, objects); 
     Log.d(TAG, "affiche contenu"); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View view = convertView; 
     Wrapper wrapper; 

     Log.d(TAG, "affiche vue"); 
     if (view == null) { 
      view = mInflater.inflate(R.layout.list_item, null); 
      wrapper = new Wrapper(view); 
      view.setTag(wrapper); 
     } else { 
      wrapper = (Wrapper) view.getTag(); 
     } 

     wrapper.getTextView().setText(getItem(position)); 
     wrapper.getBar().setBackgroundColor(    
       GestionListeNote.TAB_ALL.equals(mTag) ? getResources().getColor(allBarColor) 
         : (GestionListeNote.TAB_TOPAY.equals(mTag) ? getResources().getColor(topayBarColor) 
           : (GestionListeNote.TAB_PAID.equals(mTag) ? getResources().getColor(paidBarColor) 
             :getResources().getColor(sendBarColor))));   
     return view; 
    } 

} 

// use an wrapper (or view holder) object to limit calling the 
// findViewById() method, which parses the entire structure of your 
// XML in search for the ID of your view 
private class Wrapper { 
    private final View mRoot; 
    private TextView mText; 
    private View mBar; 

    public Wrapper(View root) { 
     mRoot = root; 
     Log.d(TAG, "initialise view"); 
    } 

    public TextView getTextView() { 
     if (mText == null) { 
      mText = (TextView) mRoot.findViewById(R.id.text); 
      Log.d(TAG, "initialise TextView"); 
     } 
     Log.d(TAG, "initialise view"); 
     return mText; 
    } 

    public View getBar() { 
     if (mBar == null) { 
      mBar = mRoot.findViewById(R.id.bar); 
      Log.d(TAG, "initialise view"); 
     } 
     Log.d(TAG, "initialise view"); 
     return mBar; 
    } 
} 

的XML

主要如下

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

<fragment 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    class="org.newnote.android.AddNoteButton" /> 

<fragment 
    android:id="@+id/tabs_fragment" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    class="org.newnote.android.GestionListeNote" /> 

liste_item

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="fill_parent" 
    android:layout_height="@dimen/list_item_height" 
    android:gravity="left|center_vertical"> 
<View 
    android:id="@+id/bar" 
    android:layout_width="10dp" 
    android:layout_height="fill_parent" /> 
<TextView 
    android:id="@+id/text" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:paddingLeft="10dp" 
    android:gravity="center" /> 

tabs_fragment

<TabHost xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@android:id/tabhost" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:background="#EFEFEF" > 

<LinearLayout 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <TabWidget 
     android:id="@android:id/tabs" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" /> 

    <FrameLayout 
     android:id="@android:id/tabcontent" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" > 

     <FrameLayout 
      android:id="@+id/tab_1" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" /> 

     <FrameLayout 
      android:id="@+id/tab_2" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" /> 

     <FrameLayout 
      android:id="@+id/tab_3" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" /> 

     <FrameLayout 
      android:id="@+id/tab_4" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" /> 
    </FrameLayout> 
</LinearLayout> 

標籤

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="80dp" 
    android:layout_height="@dimen/tab_height" 
    android:gravity="center" 
    android:padding="@dimen/tab_padding" 
    android:background="@drawable/tab_selector"> 

<TextView 
    android:id="@+id/text" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:gravity="center" 
    android:textSize="@dimen/text_small" 
    android:textStyle="bold" 
    android:textColor="@drawable/tab_text_selector" /> 

我不明白爲什麼我的片段不顯示的元素

希望你能幫助我。

Answer 1

您好像缺少onCreateView您的列表分區