Fragment nie utworzyć widok

Question

MyFragment.java

public class MyFragment extends Fragment { 
    private onItemSelectedListener listener; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.fragment, container, 
       false); 
     btn_myButton = (Button) view.findViewById(R.id.btn_new_client); 
     btn_myButton .setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 
       updateDetail("New Layout"); 
      } 
     }); 
     return view; 
    } 

    Button btn_myButton; 

    public interface onItemSelectedListener { 
     public void onItemSelected(String link); 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     if (activity instanceof onItemSelectedListener) { 
      listener = (onItemSelectedListener) activity; 
     } else { 
      throw new ClassCastException(activity.toString() 
        + " must implemenet OnItemSelectedListener"); 
     } 
    } 
    public void updateDetail(String s) { 
     listener.onItemSelected(s); 
    } 
} 

MainActivity.java

public class MainActivity extends Activity implements 
    onItemSelectedListener { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    setContentView(R.layout.main_activity); 
    super.onCreate(savedInstanceState); 
} 

public void onItemSelected(String link) { 
    FragmentManager manager = getFragmentManager(); 
    FragmentTransaction transaction = manager.beginTransaction(); 
    Fragment fragment; 
    if ("New Layout".equals(link)) { 
     fragment = new Fragment1(); 
     transaction.replace(R.id.detailFragment, fragment); 
     transaction.commit(); 
    } 
} 
} 

Fragment1.java

public class Fragment1 extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.newfragmentt, container, 
       false); 
     return v; 
    } 

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

fragment.xml

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

    <Button 
     android:id="@+id/btn_new_client" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:ems="8" 
     android:gravity="center|center_vertical" 
     android:padding="2dp" 
     android:text="@string/new_client" 
     android:textColor="#FFFFFF" > 
    </Button> 

</LinearLayout> 

main_activity.xml błąd

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="#4B6C9E" 
    android:baselineAligned="false" 
    android:orientation="horizontal" > 

    <fragment   
     android:id="@+id/FragmentId" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     class="com.examples.MyProject.MyFragment" > 
    </fragment> 
    <FrameLayout 
     android:id="@+id/detailFragment" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="2" > 
    </FrameLayout> 

</LinearLayout> 

LogCat:

FATAL EXCEPTION: main 
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.elintsys.iCaseDiary/com.examples.MyProject.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class fragment 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
    at android.app.ActivityThread.access$600(ActivityThread.java:123) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:137) 
    at android.app.ActivityThread.main(ActivityThread.java:4424) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:511) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    at dalvik.system.NativeStart.main(Native Method) 
Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class fragment 
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697) 
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:739) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251) 
    at android.app.Activity.setContentView(Activity.java:1862) 
    at com.examples.MyProject.MainActivity.onCreate(CaseEntryActivity.java:15) 
    at android.app.Activity.performCreate(Activity.java:4492) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
    ... 11 more 
Caused by: java.lang.IllegalStateException: Fragment com.elintsys.iCaseDiary.CaseEntryFragment did not create a view. 
    at android.app.Activity.onCreateView(Activity.java:4293) 
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673) 
    ... 21 more 
Sending signal. PID: 16275 SIG: 9 

Proszę pomóc mi przyjaciół.

Answer 1

Trzeba odwrócić ten:

setContentView(R.layout.main_activity); 
super.onCreate(savedInstanceState). 

do tego:

super.onCreate(savedInstanceState). 
setContentView(R.layout.main_activity); 

w swojej działalności znajduje onCreate.

Answer 2

Otrzymałem również ten błąd, mimo że wywołałem setContentView po super.onCreate. W moim przypadku było utworzenie fragmentu pracownika w moim super klasy onCreate metoda, która była wywołana przed setContentView i wyzwalania bug udokumentowane tutaj:

https://code.google.com/p/android/issues/detail?id=22564

musiałem przenieść inicjalizacji fragmentu pracownika do oddzielna metoda zwana dalej cyklem życia aktywności, aby obejść ten problem.

Wnioskiem, o to co, że kod wygląda następująco:

public class BaseActivity extends ActionBarActivity { 

    private static final String TAG_TASK_FRAGMENT = "task_fragment"; 

    protected TaskFragment taskFragment; // Used to hold a reference to the active activity between config changes 

    protected void setupTaskFragment() { 
     // It would be great if we could just do this in onCreate, but setting up the task fragment 
     // before calling setContentView() triggers the bug described here: 
     // 
     // https://code.google.com/p/android/issues/detail?id=22564 
     // 
     // So we just need to make sure Activities that run async tasks call this setup function 
     // before they do. 

     FragmentManager fm = getSupportFragmentManager(); 
     taskFragment = (TaskFragment) fm.findFragmentByTag(TAG_TASK_FRAGMENT); 

     // If the Fragment is non-null, then it is currently being 
     // retained across a configuration change. 
     if (taskFragment == null) { 
      taskFragment = new TaskFragment(); 
      fm.beginTransaction().add(taskFragment, TAG_TASK_FRAGMENT).commit(); 
      fm.executePendingTransactions(); 
     } 

    } 

} 

public class ChildActivity extends BaseActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); // If this call adds a fragment, you will have problems 
     setContentView(R.layout.activity_child); 
     setupTaskFragment(); // So we have to add our task fragment here, after we've called setContentView() 

     // further initialization here 
    } 

} 

/** 
* 
* TaskFragment 
* 
* We use this fragment to manage async tasks between configuration changes. The fragment calls 
* setRetainInstance(true) in its constructor, which makes it so that it will not be recreated 
* between configuration events (like screen rotation). Async tasks running from the fragment 
* can then be kept up to date on which activity they belong to. 
*/ 

public class TaskFragment extends Fragment { 

    private ArrayList<AsyncTask> asyncTasks = new ArrayList<AsyncTask>(); 

    public TaskFragment() { 
     super(); 
     setRetainInstance(true); 
    } 

    public void addTask(AsyncTask task) { 
     asyncTasks.add(task); 
    } 

    public void removeTask(AsyncTask task) { 
     asyncTasks.remove(task); 
    } 

    public Application getApplication() { 
     Activity activity = getActivity(); 
     if (activity != null) 
      return activity.getApplication(); 
     else 
      return null; 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     for (AsyncTask task : asyncTasks) { 
      task.onAttach(activity); 
     } 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
     for (AsyncTask task : asyncTasks) { 
      task.onDetach(); 
     } 
    } 
} 

Answer 3

oprócz tego, co Mel Stanley powiedział, trzeba także zapewnić, że dodasz android: tag do swojej aktywności xml gdzie fragment jest załadowany :

<fragment 
android:id="@+id/fragment_container" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:name="com.your_app.name.fragments.NameOfFragment" 
android:tag="fragment_tag" 
tools:layout="@layout/layout_fragment" 
/> 

zapewnia to, że gdy fragment jest załadowany po raz pierwszy przy użyciu XML nie jest ładowany za pomocą kodu Mel. Jeśli to opuścisz, będziesz miał 2 ładunki fragmentu przy pierwszym uruchomieniu - jest to problem, jeśli masz asynchroniczne żądania zmieniające układ po zakończeniu.