Question

我有一个带有三个列表项的导航抽屉。第一个显示带有文本视图的片段，第二个显示带有地图的片段。当我单击选项以显示地图片段时，它可以正常工作，当我再次切换到第一个片段时它会起作用，但是当我再次尝试点击地图片段时它会崩溃。

我的地图片段类看起来像：

public class FragmentTwo extends Fragment {

GoogleMap map;
public static Fragment newInstance(Context context) {
    FragmentTwo f = new FragmentTwo();

    return f;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

    View root = (ViewGroup) inflater.inflate(R.layout.fragment_two, null,false);
    if (root != null) {
        ViewGroup parent = (ViewGroup) root.getParent();
        if (parent != null)
            parent.removeView(root);
    }
    try {
        root = inflater.inflate(R.layout.fragment_two, container, false);
    } catch (InflateException e) {
        /* map is already there, just return view as it is */
    }

    setUpMapIfNeeded();
    return root;
}

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

@Override
public void onPause() {
    super.onPause();
    setUpMapIfNeeded();

}

@Override
public void onDestroy() {
    super.onDestroy();
}

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

private void setUpMap() {

    LatLng sydney = new LatLng(-33.867, 151.206);

    map.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
    map.setMyLocationEnabled(true);
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13));

    map.addMarker(new MarkerOptions()
            .title("Sydney")
            .snippet("The most populous city in Australia.")
            .position(sydney));


}}

我的xml看起来像：

<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" />

Answer 1

删除此行

View root = (ViewGroup) inflater.inflate(R.layout.fragment_two, null,false);

并在MainActivity中进行初始化

FragmentTwo f = new FragmentTwo();

在Oncreate中当你需要交换到这个片段时，你可以使用

 FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.frame_container, f).commit();

当从导航抽屉中点击两次时，Google会映射碎片崩溃

1 个答案: