Question

我知道同一主题有一些问题，但它们都不适用于我的情况。我正在构建一个使用googleMap的应用程序，但我的问题是该片段正在创建两次，这会导致诸如放慢app并相互重叠等问题。这是程序的工作方式：主要活动有一个容器，它首先包含一个登录片段。如果登录成功，主活动将分离登录片段并添加地图片段。

public class MapFragment extends SupportMapFragment {

private GoogleMap mMap;
private Event mEventSelected;
private Person mPersonSelected;
private Map<Marker, Event> mMapMarkers;
private List<Polyline> mLines;
private TextView mPersonFullName;
private TextView mEventDescription;
private LinearLayout mMapEvent;
private ImageView mEventIcon;
private String mEventId;


@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    mMapMarkers = new HashMap<>();
    mLines = new ArrayList<>();
    mEventSelected = null;
    mPersonSelected = null;

}

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

    super.onCreateView(inflater, container, savedInstanceState);
    View v = inflater.inflate(R.layout.fragment_map, container, false);
    v = drawDefaultLayout(v);
    if (mMap == null)
    {
        initializeMap();
    }

    return v;
}

private void initializeMap() {

    mMap = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.google_map)).getMap();
    if (getArguments() != null && getArguments().containsKey(FamilyMapData.getInstance().EVENT))
    {
        mEventId = getArguments().getString(FamilyMapData.getInstance().EVENT);
        drawCenteredMap();
    }
    pinEvents();
    markerHandler();
}

private void drawCenteredMap() {
    mEventSelected = FamilyMapData.getEvents().get(mEventId);
    setCurrentEvent();
    CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(mEventSelected.getLatitude(), mEventSelected.getLongitude()));
    mMap.moveCamera(center);
    drawLines();
}

private void pinEvents() {
    mMap.clear();
    Map <String, Event> events = FamilyMapData.getEvents();

    for (Event event : events.values())
    {
        LatLng coordinates = new LatLng(event.getLatitude(), event.getLongitude());
        String description = event.getDescription();
        if (Filter.sFilterMap.containsKey(description) && Filter.sFilterMap.get(description)) {

            float color = getColor(description);
            mMapMarkers.put(mMap.addMarker(new MarkerOptions().position(coordinates).icon(BitmapDescriptorFactory.defaultMarker(color))), event);
        }
    }
}

这是我的xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="match_parent">


<fragment
    android:layout_width="wrap_content"
    android:layout_height="0dp"
    class="com.google.android.gms.maps.SupportMapFragment"
    android:tag="@string/google_map"
    android:id="@+id/google_map"
    android:layout_weight="5"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="horizontal"
        android:layout_weight="1"
        android:clickable="true"
        android:baselineAligned="false"
        android:id="@+id/map_event">

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:id="@+id/icon_event_divisor">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingTop="10dp"
                android:paddingBottom="10dp"
                android:paddingStart="5dp"
                android:paddingEnd="5dp"
                android:clickable="false"
                android:layout_gravity="center"
                android:id="@+id/event_icon"/>

        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_gravity="center"
            >

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/person_full_name"
                    android:textSize="10dp"
                    android:id="@id/person_full_name"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="8dp"
                    android:text="@string/event_description"
                    android:layout_below="@id/person_full_name"
                    android:id="@+id/event_description"/>

            </RelativeLayout>

        </LinearLayout>


    </LinearLayout>

你能帮我弄清楚它为什么会发生，所以我可以解决它吗？提前谢谢。

Answer 1

如果你想在原始地图片段上添加额外的工作，你的片段必须扩展MapFragment，如果你想要它的回调：

import com.google.android.gms.maps.MapFragment;
public class MapFrag extends MapFragment implements GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener,
    GoogleMap.OnInfoWindowClickListener,
    GoogleMap.OnMapLongClickListener,
    GoogleMap.OnMapClickListener,
    GoogleMap.OnMarkerClickListener{

然后删除onCreateView中的inflate部分，然后更改xml布局中的类标记以解决此类：

fragment
android:layout_width="wrap_content"
android:layout_height="0dp"
class="yourPackage.MapFrag"
android:tag="@string/google_map"
android:id="@+id/google_map"
android:layout_weight="5"/>

然后在片段类中使用getMap()方法访问地图实例并继续

片段被创建两次

1 个答案: