android - 只有第一张 map 在 ViewPager 中显示有多个 SupportMapFragment

Question

背景

我有一个包含三个 fragment 的 viewpager。所有 fragment 都是同一 fragment 类的新实例，根据应用程序设置使用自定义 map 布局或 ListView 。但问题仅在 map 模式下。

问题

每次我在 map 模式下启动 viewpager Activity 时，只有当前 fragment 显示 map 。其他 fragment 是空的。看起来所有 fragment 都使用 map 的唯一实例。当前 fragment 首先得到这张 map 。其他两个 fragment 中的 map 为空。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <include
            layout="@layout/loading_component"/>

    <FrameLayout
            android:id="@+id/mapFragmentHole"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentBottom="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_gravity="center_vertical|center_horizontal" />

    <Button
            android:id="@+id/cur_location"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/map_compas"
            android:layout_alignParentRight="true"/>
    <Button
            android:id="@+id/go_back"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:textColor="@color/gray_theatre"
            android:textSize="21sp"
            android:textStyle="bold"
            android:background="@drawable/go_to_list_button_bg"
            android:text="@string/return_to_list"
            android:layout_alignParentRight="true"
            android:visibility="gone"/>

</RelativeLayout>

SectionsPagerAdapter

public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }

        @Override
        public Fragment getItem(int i) {
            if (i == 0) {
                return CinemaAllFragment.newInstance(modeFavourite);
                //return new CinemaFavouriteFragment();

            }
            if (i == 1) {
                return CinemaAllFragment.newInstance(modeOnline);
            }
            if (i == 2) {
                return CinemaAllFragment.newInstance(modeDefault);
            }
            return null;
        }

        @Override
        public int getCount() {
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
            case 0:
                return getString(R.string.frame_cinema_title1);
            case 1:
                return getString(R.string.frame_cinema_title2);
            case 2:
                return getString(R.string.frame_cinema_title4);
            }
            return null;
        }
    }

我的 fragment

public class CinemaAllFragment extends CinemaFragment implements LocationListener {
private LocationManager locationManager;
private String provider;
private GoogleMap map = null;

private Marker myPosition;
private View balloon;

private Button curLocationBtn;

protected ListView listViewCinemas = null;
protected View view;

private String fragmentMode;
private static String MODE = "mode";
private static String modeFavourite = "modeFavourite";
private static String modeOnline = "modeOnline";
private static String modeDefault = "modeDefault";
private Cinema[] cinemas;
private Long updateTime;
private Long lastUpdate;


private CinemaListArrayAdapter adapter = null;

private static String FRAGMENT = "position";

private ArrayList<Marker> Markers;

private long nowTime;

// Handler to update UI timeFr, progress bar etc,.
private Handler mHandler = new Handler();
private Runnable onEveryFiveMinutes;

private SupportMapFragment supportMapFragment = null;

public static CinemaAllFragment newInstance(String someString)
{
    CinemaAllFragment myFragment = new CinemaAllFragment();
    Bundle args = new Bundle();
    args.putString(MODE, someString);
    myFragment.setArguments(args);

    return myFragment;
}

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

    if(getArguments()!=null)
        fragmentMode = getArguments().getString(MODE, null);

    if (Settings.getCinemaTypeView() == Settings.CinemaTypeView.Map)
    {
        mLog.d("OnCreate: map "+fragmentMode);

        view = inflater.inflate(R.layout.cinema_map, container, false);

        GoogleMapOptions gmo = (new GoogleMapOptions()).zoomControlsEnabled(true).rotateGesturesEnabled(false);

        if(supportMapFragment == null)
            supportMapFragment = SupportMapFragment.newInstance(gmo);

        FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
        fragmentTransaction.add(R.id.mapFragmentHole, supportMapFragment);
        fragmentTransaction.commit();

        balloon = inflater.inflate(R.layout.cinema_list_item, null);

        ImageView delimiter = (ImageView) balloon.findViewById(R.id.delimiter);
        delimiter.setVisibility(View.GONE);

    }
    else if (Settings.getCinemaTypeView() == Settings.CinemaTypeView.Listing)
    {
        view = inflater.inflate(R.layout.cinema_list, container, false);
    }

    return view;
}

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

    if (Settings.getCinemaTypeView() == Settings.CinemaTypeView.Map)
    {
        setUpMapIfNeeded();
    }

    onUpdate();
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    if (Settings.getCinemaTypeView() == Settings.CinemaTypeView.Map)
    {
        FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
        ft.remove(supportMapFragment);
        ft.commit();
    }
}

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

class CustomInfoAdapter implements GoogleMap.InfoWindowAdapter {

    @Override
    public View getInfoContents(Marker marker) {
        displayView(marker);

        if(!marker.getTitle().equals("Я"))
        {
            return balloon;
        }
        else return null;
    }

    @Override
    public View getInfoWindow(Marker marker) {
        return null;
    }
}

public void displayView(Marker marker) {

    TextView cinema_title = (TextView) balloon.findViewById(R.id.cinema_title);

    Cinema cinema = MoviesDbAdapter.getCinemaById(marker.getTitle());

    if (cinema != null)
    {
        cinema_title.setText(cinema.title);
    }
}

public void checkGPSEnabled()
{
    // Get the location manager
    locationManager = (LocationManager) view.getContext().getApplicationContext().getSystemService(view.getContext().getApplicationContext().LOCATION_SERVICE);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER/*provider*/, 0, 0, this);

    boolean enabled = locationManager
            .isProviderEnabled(LocationManager.GPS_PROVIDER);

    // Check if enabled and if not send user to the GSP settings
    // Better solution would be to display a dialog and suggesting to
    // go to the settings
    if (!enabled) {
        new AlertDialog.Builder(view.getContext().getApplicationContext())
                .setMessage(view.getContext().getApplicationContext().getResources().getString(R.string.message_gps_off))
                .setPositiveButton(view.getContext().getApplicationContext().getResources().getString(R.string.dialog_gps_enable), new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        Intent intent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        startActivityForResult(intent, 5);
                    }
                })
                .setNegativeButton(view.getContext().getApplicationContext().getResources().getString(R.string.dialog_gps_cancel), new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int which) {

                    }
                })
                .show();
    }

}
/* Request updates at startup */

@Override
public void onLocationChanged(Location location) {
    int lat = (int) (location.getLatitude());
    int lng = (int) (location.getLongitude());
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderEnabled(String provider) {
    //getLocation();
}

@Override
public void onProviderDisabled(String provider) {
}

/**
 * Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
 * installed) and the map has not already been instantiated.. This will ensure that we only ever
 * call {@link #setUpMap()} once when {@link #map} is not null.
 * <p>
 * If it isn't installed {@link SupportMapFragment} (and
 * {@link com.google.android.gms.maps.MapView
 * MapView}) will show a prompt for the user to install/update the Google Play services APK on
 * their device.
 * <p>
 * A user can return to this Activity after following the prompt and correctly
 * installing/updating/enabling the Google Play services. Since the Activity may not have been
 * completely destroyed during this process (it is likely that it would only be stopped or
 * paused), {@link #onCreate(Bundle)} may not be called again so we should call this method in
 * {@link #onResume()} to guarantee that it will be called.
 */
private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (map == null) {
        //map = (MapView) getActivity().findViewById(R.id.map);
        // Try to obtain the map from the SupportMapFragment.
        map = supportMapFragment.getMap();
        //map.setInfoWindowAdapter(new CustomInfoAdapter());

        // Check if we were successful in obtaining the map.
        if (map != null) {
            setUpMap();
        }
    }
}

private void getLocation()
{

    mLog.d("Touch: ");
    checkGPSEnabled();

    Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER/*provider*/);

    // Initialize the location fields
    if (location != null) {
        System.out.println("Provider " + provider + " has been selected.");
        CameraPosition cp = new CameraPosition.Builder()
                .target(new LatLng(location.getLatitude(),location.getLongitude()))
                .zoom(12)
                .build();
        map.animateCamera(CameraUpdateFactory.newCameraPosition(cp));

        if (myPosition != null)
        {
            myPosition.remove();
        }
        myPosition = map.addMarker(new MarkerOptions()
                .position(new LatLng(location.getLatitude(),location.getLongitude()))
                .title("Я")
                .icon(BitmapDescriptorFactory
                        .fromResource(R.drawable.map_marker_user)));
    }
}

/**
 * This is where we can add markers or lines, add listeners or move the camera. In this case, we
 * just add a marker near Africa.
 * <p>
 * This should only be called once and when we are sure that {@link #map} is not null.
 */
private void setUpMap() {
    map.setMyLocationEnabled(true);
    //map.getUiSettings().setMyLocationButtonEnabled(true);

    //map.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}

public void onUpdate() {

    if(fragmentMode != null)
    {
        if(fragmentMode.equals(modeDefault)){
            cinemas = MoviesDbAdapter.getCinemaAll();
        }
        else if (fragmentMode.equals(modeFavourite))
        {
            cinemas = MoviesDbAdapter.getCinemaFavorites();
        }
        else if (fragmentMode.equals(modeOnline))
        {
            cinemas = MoviesDbAdapter.getCinemaOnline();
        }
        mLog.d("OnCreate: "+fragmentMode);
    }
    else
    {
        cinemas = MoviesDbAdapter.getCinemaAll();
    }

    adapter = new CinemaListArrayAdapter(getActivity(), R.layout.movies_list_item, cinemas);

    mLog.d("OnCreate: onUpdate "+fragmentMode);
    if(cinemas.length == 0)
    {
        // Load schedules
        //Utils.updateLoadingStatus(view, getString(R.string.message_loading_cinemas));
    }

    if (Settings.getCinemaTypeView() == Settings.CinemaTypeView.Map)
    {
        try
        {
            checkGPSEnabled();
        } catch (Exception e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }

        //ApiDownloader downloader = new ApiDownloader(getActivity().getApplicationContext());
        //downloader.registerAPI(getActivity().getApplicationContext());

        if (Markers != null)
        {
            for (Marker marker : Markers)
            {
                marker.remove();
            }
            Markers.clear();
        }

        Markers = new ArrayList<Marker>();

        if(map != null)
        {
            //нарисовать маркеры кинотеатров
            for (Cinema cinema : cinemas)
            {
                //mLog.d("Cinema: " + cinema.getLatitude());
                Marker cinemaMarker = map.addMarker(new MarkerOptions()
                        .position(new LatLng(Double.parseDouble(cinema.getLatitude()),Double.parseDouble(cinema.getLongitude())))
                        .title(cinema.getId().toString())
                        .icon(BitmapDescriptorFactory
                                .fromResource(R.drawable.map_marker_mini)));

                Markers.add(cinemaMarker);
            }
        }
    }
    else
    {
        //ApiDownloader downloader = new ApiDownloader(getActivity().getApplicationContext());
        //downloader.registerAPI(getActivity().getApplicationContext());

        listViewCinemas = (ListView) view.findViewById(R.id.cinemas_list_view);

        int index = 0;
        View v=null;
        if(listViewCinemas != null)
        {
            mLog.d("OnCreate: list not null "+fragmentMode+" "+cinemas.length);

            // save index and top position
            index = listViewCinemas.getFirstVisiblePosition();
            v = listViewCinemas.getChildAt(0);
            int top = (v == null) ? 0 : v.getTop();

            listViewCinemas.setAdapter(adapter);
            listViewCinemas.setSelectionFromTop(index, top);

            PauseOnScrollListener listener = new PauseOnScrollListener(imageLoader, pauseOnScroll, pauseOnFling);
            listViewCinemas.setOnScrollListener(listener);

        }
    }
}
}

Answer 1

解决问题

只需将具有 map 功能的 fragment 分开，而不是在两个新 fragment 中进行映射。新的 map fragment 扩展自 SupportMapFragment 并允许他为 himlesf 制作 View :

public class CinemaMapFragment extends SupportMapFragment implements LocationListener {

...

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    view = super.onCreateView(inflater, container, savedInstanceState);
    balloon = inflater.inflate(R.layout.cinema_list_item, null);
    return view;
}

然后我以编程方式添加我的自定义功能(只有两个按钮):

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

    LayoutInflater inflater = (LayoutInflater) getActivity().getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View vi = inflater.inflate(R.layout.location_button, null);
    View vi2 = inflater.inflate(R.layout.golist_button, null);

    curLocationBtn = (Button) vi.findViewById(R.id.cur_location);
    goToList = (Button) vi2.findViewById(R.id.go_back);

    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

    ((ViewGroup) view).addView(vi, layoutParams);

    LinearLayout.LayoutParams layoutParams2 = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);

    ((ViewGroup) view).addView(vi2, layoutParams2);

...

private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (map == null) {
        //map = (MapView) getActivity().findViewById(R.id.map);
        // Try to obtain the map from the SupportMapFragment.
        map = getMap();
        map.setInfoWindowAdapter(new CustomInfoAdapter());

        // Check if we were successful in obtaining the map.
        if (map != null) {
            setUpMap();
        }
    }
}