Question

我正在使用Android Studio制作应用程序，即使我已经获得了地图并且正在显示，我也无法添加标记或对其执行任何其他操作从OnMapReady获取的GoogleMap对象。

这是我的主要活动中的代码：

public class MainActivity extends AppCompatActivity implements OnFragmentInteractionListener, OnMapReadyCallback {
    MapFragment mapFragment;
    private GoogleMap mMap;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        switchFragments(GlobalConsts.FRAGMENT.MAP);
    }
    public void switchFragments(GlobalConsts.FRAGMENT fragment){
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        switch (fragment) {
            case MAP:
                if (mapFragment == null) {
                    mapFragment = new MapFragment();
                }
                mapFragment.getMapAsync(this);
                transaction.replace(R.id.fragmentContainer, mapFragment);
                transaction.addToBackStack(null);
                break;
        }
        transaction.commit();
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions()
                .position(sydney)
                .title("Sydney")
                .snippet("Population: 4,627,300")
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)));

        CameraPosition cameraPosition = new CameraPosition.Builder().target(sydney).zoom(12).build();
        mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
    }
}

这是我的主要活动的xml布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_main"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    tools:context="jarett.familymap.MainActivity">

    <FrameLayout
        android:id="@+id/fragmentContainer"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />

</LinearLayout>

我的MapFragment类：

public class MapFragment extends SupportMapFragment {

    public MapFragment() {}

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        super.onCreateView(inflater, container, savedInstanceState);
        return inflater.inflate(R.layout.fragment_map, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

和fragment_map.xml中我的MapFragment的xml布局：

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:id="@+id/mapFragment"
            android:orientation="vertical"
            android:layout_width="match_parent" android:layout_height="match_parent"
            class="com.google.android.gms.maps.SupportMapFragment"
            tools:context="jarett.familymap.MapFragment">

</fragment>

就像我说的那样，就显示地图片段而言，一切似乎都运行正常，但对于我的生活，我无法弄清楚为什么缩放和添加标记的代码没有做任何事情。我很感激帮助。

MapFragment正在显示，但无法使用Google Map添加标记，移动相机等

0 个答案: