Fragment did not create a view

问题:

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

main_activity.xml

LogCat error:

 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 

Please help me friends.

回答1:

You need to reverse this:

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

into this:

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

in your activity's onCreate.

回答2:

I was also getting this error, even though I was calling setContentView after super.onCreate. In my case I was setting up a worker fragment in my super class' onCreate method, which was being called before setContentView and triggering the bug documented here:

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

I had to move initialization of the worker fragment into a separate method called later in the activity lifecycle to work around this.

By request, here is what that code looks like:

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 asyncTasks = new ArrayList();      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();         }     } } 

回答3:

In addition to what Mel Stanley said you also need to ensure that you add the android:tag to your xml activity where the fragment is loaded:

This ensures that when the fragment is being loaded for the first time using the xml it is not reloaded using Mel's code. If you left this out you would have 2 loads of the fragment on first run - this is a problem if you have asynchronous requests that change the layout upon completion.

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