Android-はなぜでしょう（「コンテンツはまだ作成されていません」というエラー）

Question

これは、この質問へのフォローです：

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

     LinearLayout Layout5 = (LinearLayout) inflater.inflate(R.layout.tab_frag5_layout, container, false); 

     Cursor allBands; 
     MyDatabase db; 

     Context ctx = (Context)TabFragment5.this.getActivity(); 


     db = new MyDatabase(ctx); 
     allBands = db.getBands(); 


     ListAdapter adapter = new SimpleCursorAdapter (ctx, 
       R.layout.listelement, 
       allBands, 
       new String[] {"BandName"}, 
       new int[] {R.id.text15}); 

     getListView().setAdapter(adapter); 

     return Layout5; 

    } 

しかし、 ：だからAndroid - why is this telling me "Content view not yet created"?

、次のコードはエラーをスローしますレイアウトにボタンを追加してOnClickメソッドの中にコードを置くと、完全に機能します。このように：

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

      LinearLayout Layout5 = (LinearLayout) inflater.inflate(R.layout.tab_frag5_layout, container, false); 
      // Register for the Button.OnClick event 
      Button bShop = (Button)Layout5.findViewById(R.id.button_test); 
      bShop.setOnClickListener(new View.OnClickListener() {   
       @Override 
       public void onClick(View v) { 

        Cursor allBands; 
        MyDatabase db; 

        Context ctx = (Context)TabFragment5.this.getActivity(); 


        db = new MyDatabase(ctx); 
        allBands = db.getBands(); 


        ListAdapter adapter = new SimpleCursorAdapter (ctx, 
          R.layout.listelement, 
          allBands, 
          new String[] {"BandName"}, 
          new int[] {R.id.text15}); 

        getListView().setAdapter(adapter); 

         } 
        });                 

      return Layout5; 

なぜこのようなことが起こりますか？私はそれが断片のライフサイクルと何か関係がなければならないことを理解していますが、何ですか？どのように私はこれを迂回することができますので、リストのリストビューは、フラグメントが開くときだけでなく、私はボタンをクリックしたときに移入？

おかげ

EDIT：これが主な活動である

public class TabsFragmentActivity extends FragmentActivity implements TabHost.OnTabChangeListener { 

private TabHost mTabHost; 
private HashMap mapTabInfo = new HashMap(); 
private TabInfo mLastTab = null; 



private class TabInfo { 
    private String tag; 
    private Class clss; 
    private Bundle args; 
    private Fragment fragment; 
    TabInfo(String tag, Class clazz, Bundle args) { 
     this.tag = tag; 
     this.clss = clazz; 
     this.args = args; 
    } 

} 

class TabFactory implements TabContentFactory { 

    private final Context mContext; 

    /** 
    * @param context 
    */ 
    public TabFactory(Context context) { 
     mContext = context; 
    } 


    /** (non-Javadoc) 
    * @see android.widget.TabHost.TabContentFactory#createTabContent(java.lang.String) 
    */ 
    public View createTabContent(String tag) { 
     View v = new View(mContext); 
     v.setMinimumWidth(0); 
     v.setMinimumHeight(0); 
     return v; 
    } 

} 
/** (non-Javadoc) 
* @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle) 
*/ 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    // Step 1: Inflate layout 
    setContentView(R.layout.tabs_layout); 
    // Step 2: Setup TabHost 
    initialiseTabHost(savedInstanceState); 



    if (savedInstanceState != null) { 
     mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); //set the tab  as per the saved state 
    } 
} 

    /** (non-Javadoc) 
* @see android.support.v4.app.FragmentActivity#onSaveInstanceState(android.os.Bundle) 
*/ 
    protected void onSaveInstanceState(Bundle outState) { 
    outState.putString("tab", mTabHost.getCurrentTabTag()); //save the tab selected 
    super.onSaveInstanceState(outState); 
} 

/** 
* Step 2: Setup TabHost 
*/ 
private void initialiseTabHost(Bundle args) { 
    mTabHost = (TabHost)findViewById(android.R.id.tabhost); 
    mTabHost.setup(); 
    TabInfo tabInfo = null; 
    TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("s1"), (tabInfo = new TabInfo("Tab1", TabFragment1.class, args))); 
    this.mapTabInfo.put(tabInfo.tag, tabInfo); 
    TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("s2"), (tabInfo = new TabInfo("Tab2", TabFragment2.class, args))); 
    this.mapTabInfo.put(tabInfo.tag, tabInfo); 
    TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab3").setIndicator("s3"), (tabInfo = new TabInfo("Tab3", TabFragment3.class, args))); 
    this.mapTabInfo.put(tabInfo.tag, tabInfo); 
    TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab4").setIndicator("s4"), (tabInfo = new TabInfo("Tab4", TabFragment4.class, args))); 
    this.mapTabInfo.put(tabInfo.tag, tabInfo); 
    TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab5").setIndicator("s5"), (tabInfo = new TabInfo("Tab5", TabFragment5.class, args))); 
    this.mapTabInfo.put(tabInfo.tag, tabInfo); 
    TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab6").setIndicator("s6"), (tabInfo = new TabInfo("Tab6", TabFragment6.class, args))); 
    this.mapTabInfo.put(tabInfo.tag, tabInfo); 
    // Default to first tab 
    this.onTabChanged("Tab1"); 
    // 
    mTabHost.setOnTabChangedListener(this); 
} 

/** 
* @param activity 
* @param tabHost 
* @param tabSpec 
* @param clss 
* @param args 
*/ 
private static void addTab(TabsFragmentActivity activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) { 
    // Attach a Tab view factory to the spec 
    tabSpec.setContent(activity.new TabFactory(activity)); 
    String tag = tabSpec.getTag(); 

    // Check to see if we already have a fragment for this tab, probably 
    // from a previously saved state. If so, deactivate it, because our 
    // initial state is that a tab isn't shown. 
    tabInfo.fragment = activity.getSupportFragmentManager().findFragmentByTag(tag); 
    if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) { 
     FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction(); 
     ft.detach(tabInfo.fragment); 
     ft.commit(); 
     activity.getSupportFragmentManager().executePendingTransactions(); 
    } 

    tabHost.addTab(tabSpec); 
} 

/** (non-Javadoc) 
9 
* @see android.widget.TabHost.OnTabChangeListener#onTabChanged(java.lang.String) 
*/ 
public void onTabChanged(String tag) { 
    TabInfo newTab = (TabInfo) this.mapTabInfo.get(tag); 
    if (mLastTab != newTab) { 
     FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction(); 
     if (mLastTab != null) { 
      if (mLastTab.fragment != null) { 

       ft.detach(mLastTab.fragment); 
      } 

     } 
     if (newTab != null) { 
      if (newTab.fragment == null) { 
       newTab.fragment = Fragment.instantiate(this, 
         newTab.clss.getName(), newTab.args); 
       ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag); 
      } else { 
       ft.attach(newTab.fragment); 

      } 
     } 

     mLastTab = newTab; 
     ft.commit(); 
     this.getSupportFragmentManager().executePendingTransactions(); 
    } 
} 

} 

とフラグメントXML

 <?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/mylayout2" 
    android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:background="#D6D6D6" 
> 

<Button 
    android:id="@+id/button_test" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_weight="0" 
    android:text="Button" /> 

<ListView 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_weight="0" 
    android:id="@android:id/list"></ListView> 

Answer 1

あなたは断片クラスまたはListFragmentを拡張しますか？ は、これは私がListFragment内でそれを使用する方法です - >

public class FooFragment extends ListFragment{ 

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View root = inflater.inflate(R.layout.fragment_eventlist, null); 
     eventAdapter = new EventAdapter(getActivity(), R.layout.list_item_event, events); 
     setListAdapter(eventAdapter); 
     return root; 
     } 
} 

編集：setAdapter（）が呼び出されているとき、ここで重要なのがある

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View root = inflater.inflate(R.layout.fragment_activitystream, null); 
      return root; 
      } 

    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 
     states = new ArrayList<Status>(); 
      ... 
     YourAdapter asa = new YourAdapter(getActivity(), R.layout.list_item_status, states); 
     setListAdapter(asa); 
     Log.i(TAG, "onCreate is done"); 
    }