在 SupportMapFragment Java Android Studio 中使用 getMap() 的替代方法

Question

我目前正在为我的武术组织开发应用程序。我想要一个使用 SupportMapFragment 的片段，它显示我所在州内每个武术道场的不同位置。我目前设置了一个导航抽屉，其中有一个标题为 "Locations" 的选项卡。我正在关注 Tutsplus 的人员如何创建他们的 Zoo 应用程序并在该应用程序中包含一张地图。我正在查看的代码是 here. 在他们在 Youtube 上的代码和教程中找到的，他们使用 getMap().animateCamera... 来控制相机并使地图正常工作。我已经知道 getMap() 已从 Android 中删除，并且 getMapAsync(this) 是一个更好的选择，但是我正在努力弄清楚如何将 getMapAsync() 工作到我的代码中我的代码当前已设置，我需要一些帮助。我查看了 Google 的所有文档并通读了该站点上的多个线程，但运气不佳。下面是我的 LocationFragment.java:

代码

public class LocationFragment extends SupportMapFragment {

    public static LocationFragment getInstance() {
        LocationFragment fragment = new LocationFragment();

        return fragment;
    }
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

        super.onViewCreated(view, savedInstanceState);

        CameraPosition position = CameraPosition.builder()
                .target(new LatLng(42.921966,  -85.718533))
                .zoom( 16f )
                .bearing( 0.0f )
                .tilt( 0.0f )
                .build();

        getMap().animateCamera(CameraUpdateFactory.newCameraPosition(position), null);
        getMap().setMapType(GoogleMap.MAP_TYPE_HYBRID);
        getMap().setTrafficEnabled(true);

        getMap().getUiSettings().setZoomControlsEnabled(true);

        MarkerOptions options = new MarkerOptions().position(new LatLng(42.921966,  -85.718533));
        options.title("KFCOM");
        options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
        getMap().addMarker(options);

        getMap().setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
            @Override
            public boolean onMarkerClick(Marker marker) {
                marker.showInfoWindow();
                return true;
            }
        });

        RestAdapter adapter = new RestAdapter.Builder()
                .setEndpoint("https://gist.githubusercontent.com/anonymous/101ffbf7e1aed60b7caf7d3d5418bfde/raw/43b5d1fa6862fd1dce84044821cdf1a9d48b6ca2")
                .build();
        PinsApiInterface pinsApiInterface = adapter.create(PinsApiInterface.class );

        pinsApiInterface.getStreams(new Callback<List<Pin>>() {
            @Override
            public void onResponse(Call<List<Pin>> pins, Response<List<Pin>> response) {
                for( Pin pin : response.body()) {
                    MarkerOptions options = new MarkerOptions().position( new LatLng(pin.getLatitude(), pin.getLongitude()));
                    options.title(pin.getName());
                    options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
                    getMap().addMarker(options);
                }
            }

            @Override
            public void onFailure(Call<List<Pin>> call, Throwable t) {

            }
        });
    }
}

下面是我的 Main Activity，它实例化了导航抽屉并在不同选项卡之间切换，包括 "locations" 选项卡。我包含了所有代码，因为我不确定 Main Activity 中是否有需要更改的内容。在onDrawerSectionItemClickedEvent.

中的代码最底部可以找到片段之间切换的代码

public class Home extends AppCompatActivity {

    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle mActionBarDrawerToggle;
    private String mCurrentFragmentTitle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        mDrawerLayout = (DrawerLayout) findViewById( R.id.drawer_layout );

        mActionBarDrawerToggle = new ActionBarDrawerToggle(
                this,
                mDrawerLayout,
                R.string.drawer_opened,
                R.string.drawer_closed )

        {
            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if(getSupportActionBar() != null)
                    getSupportActionBar().setTitle(R.string.drawer_opened);

            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                if(getSupportActionBar() != null)
                    getSupportActionBar().setTitle(R.string.drawer_closed);
            }
        };

        mDrawerLayout.addDrawerListener( mActionBarDrawerToggle );

        displayInitialFragment();
    }

    private void displayInitialFragment() {
        getSupportFragmentManager().beginTransaction().replace(R.id.container, HomeFragment.getInstance() ).commit();
        mCurrentFragmentTitle = getString(R.string.Home);
    }

    @Override
    public void onPostCreate(Bundle savedInstanceState){
        super.onPostCreate(savedInstanceState);
        mActionBarDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mActionBarDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (mActionBarDrawerToggle.onOptionsItemSelected( item ) )
            return true;

        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onStart() {
        super.onStart();
        EventBus.getInstance().register( this );
    }

    @Override
    protected void onStop() {
        EventBus.getInstance().unregister( this );
        super.onStop();
    }

    @Subscribe
    public void onDrawerSectionItemClickedEvent(DrawerSectionItemClickedEvent event) {
        mDrawerLayout.closeDrawers();

        if(event == null || TextUtils.isEmpty( event.section ) || event.section.equalsIgnoreCase(mCurrentFragmentTitle))
        {
            return;
        }

        Toast.makeText( this, "Home: Section Clicked: " + event.section, Toast.LENGTH_SHORT).show();

        if(event.section.equalsIgnoreCase( "locations" )){
            getSupportFragmentManager().beginTransaction().replace(R.id.container, LocationFragment.getInstance()).commit();
        } else if (event.section.equalsIgnoreCase( "current members" ))
        {
            getSupportFragmentManager().beginTransaction().replace(R.id.container, MembersFragment.getInstance()).commit();
        } else if (event.section.equalsIgnoreCase( "home" ))
        {
            getSupportFragmentManager().beginTransaction().replace(R.id.container, HomeFragment.getInstance()).commit();
        } else {
            return;
        }

        mCurrentFragmentTitle = event.section;
    }
}

Answer 1

第 1 步：让 LocationFragment 实施 OnMapReadyCallback。

第 2 步：将所有当前 onViewCreated() 逻辑移至 onMapReady()（OnMapReadyCallback 要求）

第 3 步：在 onViewCreated() 中，调用 getMapAsync(this)

在 SupportMapFragment Java Android Studio 中使用 getMap() 的替代方法

Alternative to using getMap() in SupportMapFragment Java Android Studio

java

android

google-maps

android-fragments

supportmapfragment