从backstack返回时,Google Maps v2 MapFragment非常滞后

Question

我正在开发一个使用v2的应用程序,MapFragment我遇到了非常奇怪的行为.我已经创建了一个子类MapFragment来处理一些自定义行为(处理Markers,调整菜单选项等),并在第一次加载它时所有工作都很漂亮.然后我将一个新片段嵌入到我的活动中,将自定义推MapFragment到了后台上.然而,当我从后台堆栈返回地图时,事情变得奇怪; 平移地图变得极其迟钝(我们正在谈论~1 FPS),无论是手动拖动/缩放还是通过点击引脚引起的动画.而再如果我与溢出菜单的任何部分进行交互,即使只是打开它并再次解除它,滞后会立即清除.似乎没有别的东西可以解决它(没有关闭/重新打开应用程序); 与非溢出菜单项进行交互,导航抽屉没有任何帮助.我从来没有见过这样的东西,也找不到之前描述过类似问题的人.任何想法,建议和/或修复都将受到欢迎.

在被问到之前回答几个问题:

• 是的,我正在调用super我覆盖的所有生命周期方法的版本(onCreate(),onCreateView()[我还返回超级返回的那个],以及onDestroyView()).
• 据我所知,我正在清理地图.每次刷新引脚时,我都会调用remove()它们,然后clean()在地图上调用,我也会这样做onDestroyView().

最后,作为参考,这是添加新片段的代码:

getFragmentManager().beginTransaction().replace(R.id.main_content_container, new JoinGroupFragment()).addToBackStack(null).commit();

当我完成它时,我只是打电话给:

getFragmentManager().popBackStack();

编辑:我不确定它会有多大帮助,但这是习惯MapFragment:

public class CustomMapFragment extends MapFragment {

    private static final String DIALOG_TAG = "CUSTOM_MAP_FRAGMENT_DIALOG";
    private static final int DEFAULT_ZOOM = 14;
    private static final int MARKER_ZOOM = 15;
    private static final int DEFAULT_PADDING = 80;
    private static final int ORANGE_THRESHOLD_MINUTES = 7;
    private static final int BLUE_THRESHOLD_MINUTES = 20;

    public static final String KEY_GROUP_NAME = "GROUP_NAME";
    public static final String KEY_GROUP_ID = "GROUP_ID";

    private TextView mGroupNameOverlay;
    private GoogleMap mMap;
    private ArrayList<Marker> mMarkers;
    private Marker mSelectedMarker;
    private ArrayList<Group> mAllGroups;
    private Group mCurrentGroup;
    private ArrayList<Location> mAllLocations;
    private boolean mMapReady;
    private String mUsername;
    private boolean mCenterOnUser;

    public CustomMapFragment() {

    }

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

        mMarkers = new ArrayList<>();
        mAllLocations = new ArrayList<>();

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        mUsername = prefs.getString(PreferenceUtils.KEY_USERNAME, null);
        mCenterOnUser = prefs.getBoolean(PreferenceUtils.KEY_CENTER_ON_ME, false);
        mSelectedMarker = null;
    }

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

        if (view != null) {
            // View should never be null; MapFragments have a FrameLayout as their top level parent
            mGroupNameOverlay = (TextView)inflater.inflate(R.layout.group_name_overlay, view, false);
            view.addView(mGroupNameOverlay);
        }

        Bundle results = ((MainActivity)getActivity()).getFragmentResults();
        if (results != null) {
            String name = results.getString(KEY_GROUP_NAME);
            String id = results.getString(KEY_GROUP_ID);
            if (!StringUtils.isNullOrEmpty(name) && !StringUtils.isNullOrEmpty(id)) {
                mCurrentGroup = new Group(name, id);
                mAllGroups.add(mCurrentGroup);
            }
        }

        if (mCurrentGroup != null) {
            updateGroupNameOverlay(mCurrentGroup.getGroupName());
        }

        getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(GoogleMap googleMap) {
                mMap = googleMap;
                mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
                    @Override
                    public boolean onMarkerClick(Marker marker) {
                        mSelectedMarker = marker;
                        getActivity().invalidateOptionsMenu();
                        return false;
                    }
                });
                mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
                    @Override
                    public void onMapClick(LatLng latLng) {
                        mSelectedMarker = null;
                        getActivity().invalidateOptionsMenu();
                    }
                });
                populateMap(true, false);
            }
        });

        GetGroupsRequest request = new GetGroupsRequest();
        request.setListener(new GetGroupsRequestListener());
        RequestProcessor.getInstance(getActivity()).queueRequest(request);

        return view;
    }

    @Override
    public void onDestroyView() {
        mSelectedMarker = null;
        for (Marker marker : mMarkers) {
            marker.remove();
        }
        mMarkers.clear();
        mMap.clear();
        mMap = null;
        mMapReady = false;
        super.onDestroyView();
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        if (mSelectedMarker == null) {
            inflater.inflate(R.menu.menu_map, menu);
        }
        else {
            inflater.inflate(R.menu.menu_marker, menu);
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.map_menu_refresh_pins:
                performLocationsRequest(false);
                return true;
            case R.id.map_menu_recenter_zoom:
                populateMap(true, true);
                return true;
            case R.id.map_menu_select_group:
                DialogFragment selectDialog = new DialogFragment() {

                    @Override
                    public Dialog onCreateDialog(Bundle savedInstanceState) {
                        String[] groups = new String[mAllGroups.size()];
                        for (int i = 0; i < groups.length; i++) {
                            groups[i] = mAllGroups.get(i).getGroupName();
                        }
                        return new AlertDialog.Builder(getActivity())
                                .setItems(groups, new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog, int which) {
                                        if (!mAllGroups.get(which).equals(mCurrentGroup)) {
                                            mCurrentGroup = mAllGroups.get(which);
                                            updateGroupNameOverlay(mCurrentGroup.getGroupName());
                                            performLocationsRequest(true);
                                        }
                                    }
                                })
                                .create();
                    }
                };
                selectDialog.show(getFragmentManager(), DIALOG_TAG);
                return true;
            case R.id.map_menu_join_group:
                getFragmentManager().beginTransaction().replace(R.id.main_content_container, new JoinGroupFragment()).addToBackStack(null).commit();
                return true;
            case R.id.map_menu_create_group:
                CreateDialogFragment createDialog = new CreateDialogFragment();
                createDialog.show(getFragmentManager(), DIALOG_TAG);
                return true;
            case R.id.map_marker_zoom:
                if (mSelectedMarker != null) {
                    mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mSelectedMarker.getPosition(), MARKER_ZOOM));
                }
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void performLocationsRequest(boolean autoZoom) {
        GetLocationsRequest request = new GetLocationsRequest(mCurrentGroup.getGroupId());
        request.setListener(new GetLocationsRequestListener(autoZoom));
        RequestProcessor.getInstance(getActivity()).queueRequest(request);
    }

    private void updateGroupNameOverlay(final String groupName) {
        if (mGroupNameOverlay != null) {
            getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if (groupName == null) {
                        mGroupNameOverlay.setText(R.string.map_group_overlay_no_group);
                    }
                    else {
                        mGroupNameOverlay.setText(getString(R.string.map_group_overlay_group, groupName));
                    }
                }
            });
        }
    }

    private void populateMap(boolean zoom, boolean animate) {
        if (!mMapReady) {
            mMapReady = true;
        }
        else {
            CameraUpdate update = null;
            mSelectedMarker = null;
            for (Marker marker : mMarkers) {
                marker.remove();
            }
            mMarkers.clear();
            mMap.clear();
            if (mAllLocations.size() == 1) {
                Location location = mAllLocations.get(0);
                mMarkers.add(addMarker(location));
                update = CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), DEFAULT_ZOOM);
            }
            else if (mAllLocations.size() > 1) {
                LatLngBounds.Builder builder = new LatLngBounds.Builder();
                for (Location location : mAllLocations) {
                    mMarkers.add(addMarker(location));
                    if (mCenterOnUser) {
                        if (location.getUsername().equals(mUsername)) {
                            update = CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), DEFAULT_ZOOM);
                        }
                    }
                    else {
                        builder.include(new LatLng(location.getLatitude(), location.getLongitude()));
                    }
                }
                if (!mCenterOnUser) {
                    update = CameraUpdateFactory.newLatLngBounds(builder.build(), DEFAULT_PADDING);
                }
            }

            if (update != null && zoom) {
                if (animate) {
                    mMap.animateCamera(update);
                }
                else {
                    mMap.moveCamera(update);
                }
            }
        }
    }

    private Marker addMarker(Location location) {
        String timestamp;
        long minutesOld = (new Date().getTime() - location.getLastReported()) / 60000;
        float hue = BitmapDescriptorFactory.HUE_RED;
        if (minutesOld < 1) {
            timestamp = getString(R.string.map_timestamp_just_now);
        }
        else if (minutesOld < 2) {
            timestamp = getString(R.string.map_timestamp_one_minute);
        }
        else {
            timestamp = getString(R.string.map_timestamp_n_minutes, minutesOld);
            if (minutesOld >= ORANGE_THRESHOLD_MINUTES) {
                hue = BitmapDescriptorFactory.HUE_ORANGE;
            }
            if (minutesOld >= BLUE_THRESHOLD_MINUTES) {
                hue = BitmapDescriptorFactory.HUE_BLUE;
            }
        }
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        return mMap.addMarker(new MarkerOptions()
                .position(latLng)
                .icon(BitmapDescriptorFactory.defaultMarker(hue))
                .title(location.getUsername())
                .snippet(timestamp));
    }

    private class GetGroupsRequestListener extends RequestListener<GetGroupsResponse> {

        public GetGroupsRequestListener() {
            super(getActivity());
        }

        @Override
        protected void onRequestComplete(GetGroupsResponse response) {
            mAllGroups = response.getGroups();
            if (mAllGroups.size() > 0) {
                if (mCurrentGroup == null) {
                    mCurrentGroup = mAllGroups.get(0);
                    updateGroupNameOverlay(mCurrentGroup.getGroupName());
                }
                performLocationsRequest(true);
            }
        }
    }

    private class GetLocationsRequestListener extends RequestListener<GetLocationsResponse> {

        private boolean mmAutoZoom;

        public GetLocationsRequestListener(boolean autoZoom) {
            super(getActivity());
            mmAutoZoom = autoZoom;
        }

        @Override
        protected void onRequestComplete(GetLocationsResponse response) {
            mAllLocations = response.getLocations();
            getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    populateMap(mmAutoZoom, false);
                }
            });
        }
    }
}

PS我意识到这可能不是最好的做法来劫持视图创建并以这种方式注入我自己的叠加层,但是为了它的价值,我尝试将该部分评论出去并且它没有解决问题,所以我是怀疑它是否相关.

Answer 1

我遇到过类似的问题。假设我有带有子 SupportMapFragment 的 FragmentA。通过导航抽屉菜单，我调用了一个要显示的对话框。此时 FragmentA 中的子地图进入某种“背景模式”——它大约每秒更新两次（我在这张地图上有动画标记，所以这种行为对我来说是众所周知的）。这种“背景”模式通过显示带有覆盖层、fe 对话框或 AppBar 菜单的任何元素来打开，当该元素被隐藏时关闭。

在对话框中，我有项目列表，当点击这些项目时，这些项目开始片段替换事务。此时 FragmentA 被 FragmentB 取代。这是 OnClickListener 的代码片段：

final SmartFragment fragment = new SmartFragment();
FragmentManager supportFragmentManager = getActivity().getSupportFragmentManager();
supportFragmentManager
        .beginTransaction()
        .replace(R.id.fragment_container, fragment, SmartFragment.FRAGMENT_TAG)
        .addToBackStack(null)
        .commit();
dismiss();

但是在我从 backstack 返回到 FragmentA 之后，保留的 map 仍然处于“后台模式”，即使对话框不再存在。在事务之前移动 dissmiss() 语句无济于事，就像在执行所有代码之前不会解除对话框一样。所以唯一合理的解决方案（除了直接在地图片段上打开“背景模式”，我找不到怎么做）是延迟片段事务，直到对话框真正被解除。正如我之前假设的，只有在 OnClick（它是对话框的一部分）中的所有代码都被执行时才会发生，所以我们需要使事务不在声明它的实例中完成，但稍后将其放置在 Runnable 中：

dismiss();
final SmartFragment fragment = new SmartFragment();
Handler handler = new Handler();
final FragmentManager supportFragmentManager = getActivity().getSupportFragmentManager();
handler.post(new Runnable() {
    @Override
    public void run() {
        supportFragmentManager
                .beginTransaction()
                .replace(R.id.fragment_container, fragment, StopsSmartFragment.FRAGMENT_TAG)
                .addToBackStack(null)
                .commit();
    }
});

为此，我们需要使我们的片段和 supportFragmentManager 成为最终版本。现在一切正常，地图的“后台模式”已关闭，如果您从后台堆栈返回 FragmentA，地图将正常工作。

如果有人知道如何直接关闭地图片段中的“背景模式”，请告诉我，我很乐意听到。