2

我将尝试描述我的情况:

我有MyFragment extends Fragment压倒一切onCreateView()的 .

MyFragment.java

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.my_fragment, null);
        //some manipulation with view
        return view;

my_fragment.xml

<LinearLayout
       .....
  >
  <com.example.widgets.MyMapWidget
                   android:id="@+id/my_map"
                   android:layout_width="match_parent"
                   android:layout_height="300dp"
                   />
 </LinearLayout>

MyMapWidget.java

public class MyMapWidget extends LinearLayout {

  public MyMapWidget(final Context context, AttributeSet attrs) {
        super(context, attrs);
       ((LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.widget_map, this, true);
...
}

widget_map.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
             >
        <!-- Some another views-->
        <fragment xmlns:android="http://schemas.android.com/apk/res/android"
                  android:id="@+id/my_map_fragment"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  class="com.google.android.gms.maps.SupportMapFragment"
       />
       <!-- Some another views-->
</LinearLayout>

当我第一次展示时MyFragment- 一切都很好。但是,如果然后我显示另一个片段(带有清理回堆栈)然后MyFragment再显示 - 我得到了Inflate Exception

Stacktrase

android.view.InflateException: Binary XML file line #151: Error inflating class <unknown>
        at android.view.LayoutInflater.createView(LayoutInflater.java:606)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
        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.***.****.fragments.MyFragment.onCreateView(MyFragment.java:78)`

第 78 行MyFragment.java(方法onCreateView

View view = inflater.inflate(R.layout.my_fragment, null);

MyMapWidgetmy_fragment.xml已解决的问题中删除。但我有一些问题:

  1. 为什么会发生?
  2. 我可以这样显示地图吗?
  3. 可能你知道另一种方式如何呈现地图像自己的一部分Fragment

注意:我检查了类似问题的答案,但无法解决我的情况。

4

3 回答 3

2

我记得前段时间遇到过类似的问题。对我有用的是在片段onCreateView方法中以编程方式创建地图。就像是。-

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = super.onCreateView(inflater, container, savedInstanceState, R.layout.fragment_layout);
    setupMap(); 
    return view;
}

private void setupMap() {
    mapFragment = new SupportMapFragment();
    ParentActivity activity = getParentActivity();
    if (activity != null) {
        FragmentTransaction fragmentTransaction = activity.getSupportFragmentManager().beginTransaction();
        fragmentTransaction.add(R.id.wrapperMapPlaces, mapFragment);
        fragmentTransaction.commit();
    }
}
于 2013-09-23T15:32:55.203 回答
2

您可以将地图放在它自己的片段中,如下所示:

public class GoogleMapFragment extends MapFragment {

private static final String SUPPORT_MAP_BUNDLE_KEY = "MapOptions";

public GoogleMapFragment() {
    mCallback = null;
}

public static interface OnGoogleMapFragmentListener {
    void onMapReady(GoogleMap map);
}


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

public static GoogleMapFragment newInstance() {
    return new GoogleMapFragment();
}

public static GoogleMapFragment newInstance(GoogleMapOptions options) {
    Bundle arguments = new Bundle();
    arguments.putParcelable(SUPPORT_MAP_BUNDLE_KEY, options);

    GoogleMapFragment fragment = new GoogleMapFragment();
    fragment.setArguments(arguments);
    return fragment;
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mCallback = (OnGoogleMapFragmentListener) getActivity();
    } catch (ClassCastException e) {
        throw new ClassCastException(getActivity().getClass().getName()
                + " must implement OnGoogleMapFragmentListener");
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = super.onCreateView(inflater, container, savedInstanceState);
    if (mCallback != null) {
        mCallback.onMapReady(getMap());
    }
    return view;
}

private OnGoogleMapFragmentListener mCallback;
}

并将其添加到您的活动中,如下所示:

 // create a new map
 mapsFragment = GoogleMapFragment.newInstance();

 // Then we add it using a FragmentTransaction.
 FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
 fragmentTransaction.replace(android.R.id.content, mapsFragment, FRAGMENT_MAP_TAG);
 fragmentTransaction.commit();

让您的活动实现OnGoogleMapFragmentListener,然后在添加地图并准备就绪时,将调用以下方法:

@Override
public void onMapReady(GoogleMap map) {
       //add markers or whatever
}

希望这对您更好地控制您的地图片段有用。

于 2013-09-23T15:23:01.887 回答
0

我找到了方法,如何解决它:

  1. 检测MyFragment破坏他们视图的事件 ( onDestroyView)
  2. 在此方法中获取MyMapWidget并调用的实例destroyMap
  3. myMapWidget.destroyMap将会:

    public void destroyMap(FragmentManager fm){ fm.beginTransaction().remove(mMapFragment).commit();
    }

当父片段破坏他们的视图时,只需使用地图删除片段。

于 2013-09-25T07:27:28.117 回答