Question

我有一个包含两个主要细节片段的主要活动。我正在尝试实现类似"Multiple fragments, multiple activities"方法。

布局文件夹的 activity_main.xml中

<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"
    tools:context=".MoneyActivity"
    android:id="@+id/fragment_container" >
 <fragment class="com.mysite.money.AFragment"
              android:id="@+id/AFragment"
              android:layout_width="match_parent"
              android:layout_height="match_parent"/>
 </FrameLayout>

layout-large 文件夹 activity_main.xml

<LinearLayout 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"
    tools:context=".MoneyActivity"
    android:id="@+id/fragment_container"
    android:orientation="horizontal" >


   <fragment class="com.mysite.money.AFragment"
              android:id="@+id/AFragment"
              android:layout_width="@dimen/action_bar_title_text_size"
              android:layout_height="match_parent"/>

   <fragment class="com.mysite.money.BFragment"
              android:id="@+id/BFragment"
              android:layout_width="match_parent"
              android:layout_height="match_parent"/>


 </LinearLayout>

我收到如下错误（在平板电脑布局大时运行时）：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mysite.money/com.mysite.money.MoneyActivity}: android.view.InflateException: Binary XML file line #15: Error inflating class fragment

我正确检查了片段的类名。

我认为我得到错误BFragment

BFragment： 公共类BFragment扩展了SherlockFragment {

    String selectedItem="";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        int size = getArguments().size();
        if(size>0)
        {
            selectedItem = getArguments().getString("position").toString();
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        TextView textView=new TextView(inflater.getContext());
        textView.setText("Selected Item->"+selectedItem);
        return textView;
    }

}

我的mainActivity中的OnItemSelected（与片段A相关）

**@Override
    public void onItemSelected(String id) {
          BFragment displayFrag = (BFragment) getSupportFragmentManager().findFragmentById(new BFragment().getId());
        if (displayFrag == null) {
            // DisplayFragment (Fragment B) is not in the layout (handset layout),
            // so start DisplayActivity (Activity B)
            // and pass it the info about the selected item
            Intent intent = new Intent(this, BActivity.class);
            intent.putExtra("position", id);
            Log.i("innodea", "position->"+id);
            startActivity(intent);

        } else {
            // DisplayFragment (Fragment B) is in the layout (tablet layout),
            // so tell the fragment to update
            //displayFrag.updateContent(id);
        }
    }**

AFragment：

public class AFragment extends SherlockListFragment {

    private View inflate;
    private Callbacks mCallbacks = sDummyCallbacks;
    private int mActivatedPosition= ListView.INVALID_POSITION;
    private static final String STATE_ACTIVATED_POSITION = "activated_position";

    public interface Callbacks {
        public void onItemSelected(String id);
    }

    /**
     * A dummy implementation of the {@link Callbacks} interface that does
     * nothing. Used only when this fragment is not attached to an activity.
     */
    private static Callbacks sDummyCallbacks = new Callbacks() {
        public void onItemSelected(String id) {
        }
    };

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        // Activities containing this fragment must implement its callbacks.
        if (!(activity instanceof Callbacks)) {
            throw new IllegalStateException(
                    "Activity must implement fragment's callbacks.");
        }

        mCallbacks = (Callbacks) activity;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setListAdapter(new ArrayAdapter<DummyContent.DummyItem>(getActivity(),android.R.layout.simple_list_item_activated_1,android.R.id.text1, DummyContent.ITEMS));
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Restore the previously serialized activated item position.
        if (savedInstanceState != null
                && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
            setActivatedPosition(savedInstanceState
                    .getInt(STATE_ACTIVATED_POSITION));
        }
    }



    @Override
    public void onDetach() {
        super.onDetach();

        // Reset the active callbacks interface to the dummy implementation.
        mCallbacks = sDummyCallbacks;
    }

    @Override
    public void onListItemClick(ListView listView, View view, int position,long id) {
        super.onListItemClick(listView, view, position, id);

        // Notify the active callbacks interface (the activity, if the
        // fragment is attached to one) that an item has been selected.
        mCallbacks.onItemSelected(DummyContent.ITEMS.get(position).id);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mActivatedPosition != ListView.INVALID_POSITION) {
            // Serialize and persist the activated item position.
            outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
        }
    }

    /**
     * Turns on activate-on-click mode. When this mode is on, list items will be
     * given the 'activated' state when touched.
     */
    public void setActivateOnItemClick(boolean activateOnItemClick) {
        // When setting CHOICE_MODE_SINGLE, ListView will automatically
        // give items the 'activated' state when touched.
        getListView().setChoiceMode(
                activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
                        : ListView.CHOICE_MODE_NONE);
    }

    private void setActivatedPosition(int position) {
        if (position == ListView.INVALID_POSITION) {
            getListView().setItemChecked(mActivatedPosition, false);
        } else {
            getListView().setItemChecked(position, true);
        }

        mActivatedPosition = position;
    }

}

Answer 1

如果在调用android.view.InflateException: Binary XML file line: #... Error inflating class fragment之前在片段内部使用getActivity()进行操作，则可能会发生onActivityCreated()异常。在这种情况下，您会收到错误的活动参考，并且不能依赖它。

例如，下一个模式是错误的：

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

    Button button = getActivity().findViewById(R.id...);
    button.setOnClickListener(...); - another problem: button is null

    return view;
}

Answer 2

需要为静态片段添加唯一ID。仔细查看Logs以查找错误后我找到了它。点击以下链接查看错误详情：

Error Inspection in logs

不需要像许多帖子中所建议的FragmentActivity。 AppCompatActivity很好。所以，像下面的代码工作正常。

<?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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:text="Customize your Android: " />

    <fragment xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.example.android.android_me.ui.MasterListFragment"
        android:id="@+id/StaticFragment"/>

</LinearLayout>

Answer 3

您的碎片代码很可能已被破坏，只是在创建过程中崩溃，最终导致通货膨胀失败。在片段创建期间调用每个片段onCreateView()和相关方法的植物断点，或尝试手动实例化片段（new AFragment()）并将其附加到布局以查看确切失败的位置。

Answer 4

You need to import the Fragment class from android.support.v4.app.Fragment instead of android.app.Fragment.

import android.support.v4.app.Fragment;

And in the XML file of the activity where you intend to use this fragment, you need to use:

        <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/map_fragment"
        name="yourpackagname.yourfragmentclass"/>
        //package name here, is the name of folder which is in java directory.

错误导致类片段错误

4 个答案: