我的片段未附加到主要活动类别。

以我以往的经验，我将尝试使用列表中BaseAdapter，它使用从array两串在string定义values.xml我的应用程序崩溃说我的片段不附有活动有一定的自定义列表项。我的片段未附加到主要活动类别。

MainActivity.java是：

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     FragmentManager fragmentManager = getFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 

     MyListFragment myListFragment = new MyListFragment(); 
     fragmentTransaction.replace(android.R.id.content, myListFragment); 
     fragmentTransaction.commit(); 

    } 

}

MyListFragment.java是：

public class MyListFragment extends ListFragment{ 

    MyCustomAdapter mAdapter; 
    String[] title = getResources().getStringArray(R.array.list_items); 
    String[] details = getResources().getStringArray(R.array.sub_list_items); 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.list_view, container,false); 

     mAdapter = new MyCustomAdapter(title, details, getActivity()); 

     ListView contListView = (ListView)rootView.findViewById(android.R.id.list); 
     contListView.setAdapter(mAdapter); 

     return rootView; 
    } 
}

而且MyCustomAdapter.java是：

public class MyCustomAdapter extends BaseAdapter { 

    private Context context; 
    String[] Title; 
    String[] Detail; 

    public MyCustomAdapter(String[] text, String[] text1,Context context) { 
     Title = text; 
     Detail = text1; 
     this.context = context; 
    } 

    public int getCount() { 
     // TODO Auto-generated method stub 
     return Title.length; 
    } 

    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    // variable to hold context 


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

     LayoutInflater inflater =(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View row; 
     row = inflater.inflate(R.layout.fragment_main, parent, false); 
     TextView title, detail; 
     title = (TextView) row.findViewById(R.id.textView1); 
     detail = (TextView) row.findViewById(R.id.textView2); 
     title.setText(Title[position]); 
     detail.setText(Detail[position]); 

     return (row); 
    } 
}

崩溃后的logcat报告：

05-25 16:18:46.481: E/AndroidRuntime(23629): FATAL EXCEPTION: main 
05-25 16:18:46.481: E/AndroidRuntime(23629): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.listeventhandling/com.android.listeventhandling.MainActivity}: java.lang.IllegalStateException: Fragment MyListFragment{40d6b5e8} not attached to Activity 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2194) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.ActivityThread.access$600(ActivityThread.java:139) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.os.Looper.loop(Looper.java:154) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.ActivityThread.main(ActivityThread.java:4945) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at java.lang.reflect.Method.invokeNative(Native Method) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at java.lang.reflect.Method.invoke(Method.java:511) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at dalvik.system.NativeStart.main(Native Method) 
05-25 16:18:46.481: E/AndroidRuntime(23629): Caused by: java.lang.IllegalStateException: Fragment MyListFragment{40d6b5e8} not attached to Activity 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.Fragment.getResources(Fragment.java:817) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at com.android.listeventhandling.MyListFragment.<init>(MyListFragment.java:12) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at com.android.listeventhandling.MainActivity.onCreate(MainActivity.java:18) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.Activity.performCreate(Activity.java:4531) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071) 
05-25 16:18:46.481: E/AndroidRuntime(23629): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2150) 
05-25 16:18:46.481: E/AndroidRuntime(23629): ... 11 more

来源

2014-05-25 BST Kaal