非法状态异常：DialogFragment 无法附加到容器视图 - （在 ActionBarActivity 中）

Question

在我的扩展自android.support.v7.app.ActionBarActivity的活动中，我有一个片段通常被包含到我的视图中：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     >
     <fragment 
      android:name="com.fragments.SomeFragment"
      android:id="@+id/fragment_id"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      />
</FrameLayout>

那个很好用。

但我决定重用这个片段作为对话框，所以我使用了 android.support.v4.app.DialogFragment（来自支持库）进行了扩展。

没有做任何其他更改，我收到了异常提示。

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ExampleActivity}: java.lang.IllegalStateException: DialogFragment can not be attached to a container view
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
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:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)

    Caused by: java.lang.IllegalStateException: DialogFragment can not be attached to a container view
at android.support.v4.app.DialogFragment.onActivityCreated(DialogFragment.java:364)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1486)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1877)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:552)
at com.*.RoboActionBarActivity.onStart(RoboActionBarActivity.java:58)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1164)
at android.app.Activity.performStart(Activity.java:5114)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)
... 11 more

我该如何解决这个问题或者将我的标准片段用作对话框？

我的活动：

public class SomeActivity extends RoboActionBarActivity{

    private SomeFragment someFragment;

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

        this.someFragment = (SomeFragment) getSupportFragmentManager().findFragmentById(
            R.id.fragment_id);
    }
}

RoboActionBarActivity是一个ActionBarActivity，它实现了RoboContext（来自RoboGuice）以启用注入。

public class RoboActionBarActivity extends ActionBarActivity implements RoboContext {
private EventManager eventManager;
private final HashMap<Key<?>, Object> scopedObjects = new HashMap<Key<?>, Object>();

@Inject
private ContentViewListener ignored; // BUG find a better place to put this

@Override
protected void onCreate(final Bundle savedInstanceState) {
    final RoboInjector injector = RoboGuice.getInjector(this);
    this.eventManager = injector.getInstance(EventManager.class);
    injector.injectMembersWithoutViews(this);
    super.onCreate(savedInstanceState);
    this.eventManager.fire(new OnCreateEvent(savedInstanceState));
}

@Override
protected void onRestart() {
    super.onRestart();
    this.eventManager.fire(new OnRestartEvent());
}

@Override
protected void onStart() {
    super.onStart();
    this.eventManager.fire(new OnStartEvent());
}

@Override
protected void onResume() {
    super.onResume();
    this.eventManager.fire(new OnResumeEvent());
}

@Override
protected void onPause() {
    super.onPause();
    this.eventManager.fire(new OnPauseEvent());
}

@Override
protected void onNewIntent(final Intent intent) {
    super.onNewIntent(intent);
    this.eventManager.fire(new OnNewIntentEvent());
}

@Override
protected void onStop() {
    try {
        this.eventManager.fire(new OnStopEvent());
    } finally {
        super.onStop();
    }
}

@Override
protected void onDestroy() {
    try {
        this.eventManager.fire(new OnDestroyEvent());
    } finally {
        try {
            RoboGuice.destroyInjector(this);
        } finally {
            super.onDestroy();
        }
    }
}

@Override
public void onConfigurationChanged(final Configuration newConfig) {
    final Configuration currentConfig = getResources().getConfiguration();
    super.onConfigurationChanged(newConfig);
    this.eventManager.fire(new OnConfigurationChangedEvent(currentConfig, newConfig));
}

@Override
public void onContentChanged() {
    super.onContentChanged();
    RoboGuice.getInjector(this).injectViewMembers(this);
    this.eventManager.fire(new OnContentChangedEvent());
}

@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    this.eventManager.fire(new OnActivityResultEvent(requestCode, resultCode, data));
}

@Override
public Map<Key<?>, Object> getScopedObjectMap() {
    return this.scopedObjects;
}
}

- salcosand

---

你能展示代码的相关部分吗？ - Szymon

你能更具体地说明你所说的相关部分是什么吗？ - salcosand

就是你添加的内容 :) - Szymon

我有同样的问题，我想在一个活动中使用DialogFragment，但只想使用其中的Fragment部分，不想为我已经拥有的代码重写一遍。有没有办法解决这个问题？ - JPM

我们在项目中遇到了同样的问题。_DialogFragment 无法附加到容器视图_。我们在充气布局中有一个名为@+id/root的LinearLayout，解决方案是重命名该元素。 - KingSeg

Answer 1

如果您在DialogFragment的onCreate()方法中调用setShowsDialog(false)，则可以解决此问题。但是，当您想将此片段用作对话框时，必须调用setShowsDialog(true)。

- ivan

---

如果您使用此代码，想要将该片段再次显示为对话框，则应在何时何地调用setShowDialog(true)函数？ - prom85

Answer 2

这种情况可能是因为我在同一个片段上多次调用DialogFragment#show方法。

为了解决这个问题，我在每次调用DialogFragment#show之前创建了新的片段实例。

- user2229336

---

但是为什么在使用相同实例时会崩溃呢？ - Kinjal Rathod

Answer 3

我知道这个问题已经问过一段时间了，但是我解决的方法是动态创建碎片而不是在xml中创建。可能有更好的解决方案，但这对我起作用了。

public class MyActivity {

    private MyFragment mMyFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (savedInstanceState == null) {
            mMyFragment = new MyFragment();
            if (mMyFragment != null) {
                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                    .add(android.R.id.content, mMyFragment)
                    .commit();
            }
        }
    }
}

- wchristiansen

Answer 4

public class myDialogFragment extends DialogFragment {
    View mView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                            Bundle savedInstanceState) {
        if(mView == null ) {
            // Inflate the layout for this fragment
            mView = inflater.inflate(R.layout.fragment_dialog, container, false);
        }
        return mView;
    }

    @Override
    public void dismiss(FragmentManager manager, String tag)
    {
        super.dismiss();
        mView = null;
    }
}

- Emmanuel

---

你能解释一下你的答案吗？为什么相同的视图不起作用？ - Kinjal Rathod