如何在片段内使用谷歌地图V2？

Question

我有一个片段是Viewpager的一部分,我想在该片段中使用Google Map V2.这是我到目前为止所尝试过的,

在我的片段中,

    private SupportMapFragment map;
      private GoogleMap mMapView;

   @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);

        FragmentManager fm = getChildFragmentManager();
        map = (SupportMapFragment) fm.findFragmentById(R.id.map);
        if (map == null) {
            map = SupportMapFragment.newInstance();
            fm.beginTransaction().replace(R.id.map, map).commit();
        }



    }

    @Override
    public void onResume() {
        super.onResume();
        if (mMapView == null) {
            mMapView = map.getMap();
            Marker hamburg = mMapView.addMarker(new MarkerOptions().position(HAMBURG)
                      .title("Hamburg"));
                  Marker kiel = mMapView.addMarker(new MarkerOptions()
                      .position(KIEL)
                      .title("Kiel")
                      .snippet("Kiel is cool")
                      .icon(BitmapDescriptorFactory
                          .fromResource(R.drawable.ic_launcher)));


                  mMapView.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));

                  // Zoom in, animating the camera.
           mMapView.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);


        }
    }

在我的布局subfragment_info.xml中,我有,

<fragment
            android:id="@+id/map"
            class="com.google.android.gms.maps.SupportMapFragment"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/tableLayout1" />

我现在可以看到地图了.但标记没有显示.我认为我的Google地图mMapView为空.请帮我解决这个问题.提前致谢.

Answer 1

为地图创建一个框架,在该框架中将其添加到xml布局中

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/map_container">

<!-- The map fragments will go here --> 
</RelativeLayout>

不要在你的片段类中的xml中包含class ="com.google.android.gms.maps.SupportMapFragment".在onActivityCreated中手动获取它

    @Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    FragmentManager fm = getChildFragmentManager();
    fragment = (SupportMapFragment) fm.findFragmentById(R.id.map_container);
    if (fragment == null) {
        fragment = SupportMapFragment.newInstance();
        fm.beginTransaction().replace(R.id.map_container, fragment).commit();
    }


/***at this time google play services are not initialize so get map and add what ever you want to it in onResume() or onStart() **/
}

@Override
    public void onResume() {
        super.onResume();
        if (map == null) {
            map = fragment.getMap();
            map.addMarker(new MarkerOptions().position(new LatLng(0, 0)));
        }
    }

如果你们面临任何问题非法状态异常发生只是写下面的代码

/**此问题已在(Google Bugs)中跟踪*http://code.google.com/p/gmaps-api-issues/issues/detail?id=5064添加*代码因非法状态异常在重新点击时发生tab**为我修复它的短期解决方法是将以下内容添加到您调用的每个Fragment的*onDetach()*/

@Override
    public void onDetach() {
        super.onDetach();

        try {
            Field childFragmentManager = Fragment.class
                    .getDeclaredField("mChildFragmentManager");
            childFragmentManager.setAccessible(true);
            childFragmentManager.set(this, null);

        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

//如果你想在activity中显示map,只需通过下面的// FragmentActivity编写代码来扩展你的Activity

在onCreate

FragmentManager fm = getSupportFragmentManager();
        fragment = (SupportMapFragment) fm.findFragmentById(R.id.map_container);
        if (fragment == null) {
            fragment = SupportMapFragment.newInstance();
            fm.beginTransaction().replace(R.id.map_container, fragment)
                    .commit();
    }

在onResume

@Override
    protected void onResume() {
        super.onResume();
        if (googleMap == null) {
            initilizeMap();

        }
    }

private void initilizeMap() {
        if (googleMap != null) {

            googleMap = fragment.getMap();
            googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            googleMap.getUiSettings().setMyLocationButtonEnabled(true);
            googleMap.getUiSettings().setCompassEnabled(true);
            googleMap.getUiSettings().setRotateGesturesEnabled(true);

            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(new LatLng(latitude, longitude)).zoom(10).build();
            googleMap.animateCamera(CameraUpdateFactory
                    .newCameraPosition(cameraPosition));

            // create marker
            MarkerOptions marker = new MarkerOptions().position(new LatLng(
                    latitude, longitude));
            // ROSE color icon
            marker.icon(BitmapDescriptorFactory
                    .defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
            // adding marker
            googleMap.addMarker(marker);

            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getApplicationContext(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

可以从这些链接获取其他帮助
https://code.google.com/p/gmaps-api-issues/issues/detail?id=5064#c1 https://developers.google.com/maps/documentation/android/地图

Answer 2

您必须决定是在代码中创建片段new SupportMapFragment()还是从xml中扩充class="com.google.android.gms.maps.SupportMapFragment".

实际上你不能Fragment用另一个xml Fragment.阅读有关嵌套Fragment的内容.

您可以按照此评论关于如何添加嵌套SupportMapFragment.

Answer 3

我或多或少有同样的问题.我有一个导航抽屉,我想把地图放在一个片段中.

我跟着这个帖子(但是用西班牙语):https: //groups.google.com/forum/#!msg/desarrolladores-android/1cvqPm0EZZU/Q801Yvb2ntYJ

线索是(在我看来)更改layout.xml文件:您需要更改为以下内容而不是"layout subfragment_info.xml"中的"片段":

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

这是线程内的代码(你可以使用它并适应):https: //groups.google.com/d/msg/desarrolladores-android/1cvqPm0EZZU/9srw_9feamUJ