我会尝试描述一下我的情况:
我有MyFragment extends Fragment
具有压倒一切的onCreateView()
。
在 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;
在 my_fragment.xml
<LinearLayout
.....
>
<com.example.widgets.MyMapWidget
android:id="@+id/my_map"
android:layout_width="match_parent"
android:layout_height="300dp"
/>
</LinearLayout>
在 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);
...
}
在 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MyFragment
时- 一切都很好。但如果然后我显示另一个 fragment (带有清理后堆栈),然后 MyFragment
再次 - 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)`
MyFragment.java
中的第 78 行(方法onCreateView
)
View view = inflater.inflate(R.layout.my_fragment, null);
正在删除MyMapWidget
来自my_fragment.xml
解决了问题。但我有一些问题:
- 为什么会发生这种情况?
- 我可以显示这样的 map 吗?
- 也许您知道另一种方式如何将 map 呈现为自己的一部分
Fragment
?
注意:我检查了类似的答案 question ,但无法解决我的情况。
最佳答案
您可以将 map 放在它自己的 fragment 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 Activity 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 Activity 实现 OnGoogleMapFragmentListener,然后当添加 map 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 map fragment 有用。
关于android - 通过重写 onCreateView() 将 SupportMapFragment 放入另一个 Fragment 的方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18962372/