第二次充气时出现 Android map v2 错误

Question

我正在尝试在我的应用中使用新的 Android map 。

我有一个 FragmentActivity 布局包含(除其他外):

<LinearLayout a:id="@+id/fragment_container"
    a:layout_width="fill_parent"
    a:layout_height="100dp"
    a:layout_weight="1"/>

它还有一个按钮，可以使用(主要从示例项目复制)更改此 fragment :

if (condition) {
    fragment = new Fragment1();
} else {
    fragment = new LocationFragment();
}
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();

LocationFragment 是:

public class LocationFragment extends SupportMapFragment{
private GoogleMap mMap;

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

@Override
public void onResume() {
    super.onResume();
    setUpMapIfNeeded();
}

private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment)  getActivity().getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            setUpMap();
        }
    }
}

private void setUpMap() {
    mMap.addMarker(new MarkerOptions().position(new LatLng(60.02532, 30.370552)).title(getString(R.string.map_current_location)));
}
}

xml布局是:

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/map"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      class="com.google.android.gms.maps.SupportMapFragment"/>

问题是，当我们第二次用 LocationFragment 替换 fragment 时，android 无法从 xml 中膨胀。它在线崩溃:

view = inflater.inflate(R.layout.map_fragment, container, false);

有异常(exception):

12-17 01:47:31.209: ERROR/AndroidRuntime(4679): FATAL EXCEPTION: main
    android.view.InflateException: Binary XML file line #4: Error inflating class fragment
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:587)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:386)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
    at my.package.LocationFragment.onCreateView(LocationFragment.java:29)
    ...

而且我不知道如何解决它。我认为这可能与一个旧问题有关，即您不能使用多个 map View (在 android map v1 上发现问题)。但是在 v2 和 fragment 支持的情况下，它必须是用映射 fragment 替换 fragment 容器的方法，对吗？

Answer 1

将您的 mapview fragment 移除到 onDestroyView 方法中。

Fragment fragment = (getFragmentManager().findFragmentById(R.id.mapview));
FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
ft.remove(fragment);
ft.commit();