android - 在一个 Activity 中使用两个 SupportMapFragment 但无法从我在第一个 SupportMapFragment 中添加的第二个 SupportMapFragment 中删除标记

Question

我在一个 Activity 的两个不同 fragment 中使用两个 SupportMapFragment 时遇到奇怪的问题。

实际上，我的问题是在 OneFragment 中添加了 SupprtMapFragment，并在该 map View 中添加了 10 个标记，现在我通过添加另一个 Fragment 转到详细信息页面，并且它现在在这个 Fragment 中也有 SupprtMapFragment 我想清除它并只想显示一个图钉，但它仍然在 map 上显示 11 个标记。

这是我的源代码:

public class MapActivity extends FragmentActivity {

    private FragmentManager mFragmrg;

    public static String TAG_FRAGMENT_HOME="HomeFragment";

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

        initView();
    }



    private void initView(){

        mFragmrg=getSupportFragmentManager();

        MapHomeFragment mMapHomeFragment=new MapHomeFragment();

        FragmentTransaction mFt=mFragmrg.beginTransaction();


        mFt.replace(R.id.frame_holder, mMapHomeFragment, TAG_FRAGMENT_HOME).addToBackStack(TAG_FRAGMENT_HOME).commit();



    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.map, menu);
        return true;
    }

}

Activity 的 XMl 布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MapActivity" >

    <FrameLayout
        android:id="@+id/frame_holder"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

</RelativeLayout>

这个 fragment 有我的第一个 SupportMapFragment，我想在 map 上显示超过 11 个标记，它运行良好。

public class MapHomeFragment extends Fragment implements OnInfoWindowClickListener,OnClickListener{

    private GoogleMap mMapView;
    private FragmentManager mFragMrg;

    private SupportMapFragment mSupportMapFragment;


    private LatLng mLatnogGuj=new LatLng(23.0626, 72.5809);

    private LatLng mLatnogGujOne=new LatLng(18.9158, 72.8267);

    private LatLng mLatnogGujTwo=new LatLng(24.5925, 72.7156);

    private LatLng mLatnogGuj3=new LatLng(34.0837,74.7974);

    private LatLng mLatnogGuj4=new LatLng(23.2245, 72.6379);

    private LatLng mLatnogGuj5=new LatLng(12.9716, 77.5946);

    private LatLng mLatnogGuj6=new LatLng(23.0396, 72.5660);

    private LatLng mLatnogGuj7=new LatLng(22.3140, 73.1748);

    private LatLng mLatnogGuj8=new LatLng(20.5732, 73.7442);
    private LatLng mLatnogGuj9=new LatLng(21.1785, 72.8191);
    private LatLng mLatnogGuj10=new LatLng(28.6644, 77.2349);

    private LatLngBounds.Builder mLatlongBuilder;

    private Button mBtnMapDetail;


    private ViewSwitcher mViewSwitcher;



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

        View mView=inflater.inflate(R.layout.home_map, container, false);


        initView(mView);

        return mView;
    }


    private void initView(View mView){

        mViewSwitcher=(ViewSwitcher)mView.findViewById(R.id.viewSwitcher);

        mViewSwitcher.showNext();

        try{
            MapsInitializer.initialize(getActivity());
        }catch(Exception Exc){
            Exc.printStackTrace();
        }

        mBtnMapDetail=(Button)mView.findViewById(R.id.btn_mapdetail);
        mBtnMapDetail.setOnClickListener(this);

        mFragMrg=getFragmentManager();

        mSupportMapFragment=(SupportMapFragment) mFragMrg.findFragmentByTag("map_home_fragment");


        if(mSupportMapFragment!=null){

            mMapView=mSupportMapFragment.getMap();

            if(mMapView!=null){


                //mMapView.getUiSettings().setAllGesturesEnabled(true);

                mMapView.getUiSettings().setMyLocationButtonEnabled(true);

                mMapView.getUiSettings().setZoomGesturesEnabled(true);

                mMapView.getUiSettings().setZoomControlsEnabled(true);

                mMapView.setOnInfoWindowClickListener(this);

                mMapView.setInfoWindowAdapter(new CustomInfoViewAdapter(getActivity()));


                mLatlongBuilder=new LatLngBounds.Builder();

                MarkerOptions mMarkerOption=new MarkerOptions();
                mMarkerOption.title("Map One").position(mLatnogGuj).icon(BitmapDescriptorFactory.fromResource(R.drawable.map)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj);

                mMapView.addMarker(mMarkerOption);


                MarkerOptions mMarkerOption1=new MarkerOptions();
                mMarkerOption1.title("Map One").position(mLatnogGujOne).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_pub)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGujOne);

                mMapView.addMarker(mMarkerOption1);

                MarkerOptions mMarkerOption2=new MarkerOptions();
                mMarkerOption2.title("Map One").position(mLatnogGujTwo).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_rest)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGujTwo);

                mMapView.addMarker(mMarkerOption2);

                MarkerOptions mMarkerOption3=new MarkerOptions();
                mMarkerOption3.title("Map One").position(mLatnogGuj3).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_small)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj3);
                mMapView.addMarker(mMarkerOption3);


                MarkerOptions mMarkerOption4=new MarkerOptions();
                mMarkerOption4.title("Map One").position(mLatnogGuj4).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_take)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj4);
                mMapView.addMarker(mMarkerOption4);

                MarkerOptions mMarkerOption5=new MarkerOptions();
                mMarkerOption5.title("Map One").position(mLatnogGuj5).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_top)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj5);
                mMapView.addMarker(mMarkerOption5);


                MarkerOptions mMarkerOption6=new MarkerOptions();
                mMarkerOption6.title("Map One").position(mLatnogGuj6).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_top_hover)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj6);
                mMapView.addMarker(mMarkerOption6);


                MarkerOptions mMarkerOption7=new MarkerOptions();
                mMarkerOption7.title("Map One").position(mLatnogGuj7).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_pub)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj7);
                mMapView.addMarker(mMarkerOption7);

                MarkerOptions mMarkerOption8=new MarkerOptions();
                mMarkerOption8.title("Map One").position(mLatnogGuj8).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_rest)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGuj8);
                mMapView.addMarker(mMarkerOption8);

                MarkerOptions mMarkerOption9=new MarkerOptions();
                mMarkerOption9.title("Map One").position(mLatnogGuj9).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_small)).snippet("My Name is");
                mMapView.addMarker(mMarkerOption9);

                mLatlongBuilder.include(mLatnogGuj9);


                MarkerOptions mMarkerOption10=new MarkerOptions();
                mMarkerOption10.title("Map One").position(mLatnogGuj10).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_take)).snippet("My Name is");

                mLatlongBuilder.include(mLatnogGuj10);

                mMapView.addMarker(mMarkerOption10);

                //mMapView.animateCamera(CameraUpdateFactory.newLatLngBounds(mLatlongBuilder.build(), 120));

                mBtnMapDetail.postDelayed(new Runnable() {

                    @Override
                    public void run() {

                        mMapView.animateCamera(CameraUpdateFactory.newLatLngBounds(mLatlongBuilder.build(), 120));

                    }
                }, 250);

            }


        }



    }


    public class CustomInfoViewAdapter implements InfoWindowAdapter{


        View mLayoutInfo;


        public CustomInfoViewAdapter(Context _Context){


            LayoutInflater mLayoutInflater=(LayoutInflater) _Context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            mLayoutInfo=mLayoutInflater.inflate(R.layout.info_window_layout, null);



        }



        @Override
        public View getInfoContents(Marker marker) {

            return mLayoutInfo;
        }

        @Override
        public View getInfoWindow(Marker marker) {

            return null;
        }


    }


    @Override
    public void onInfoWindowClick(Marker arg0) {
        // TODO Auto-generated method stub

    }


    @Override
    public void onClick(View v) {

        intiDetailFragment();

    }


    private void intiDetailFragment(){

        MapDetailFragment mMapDetailFragment=new MapDetailFragment();

        FragmentTransaction mFt=mFragMrg.beginTransaction();

        mFt.add(R.id.frame_holder, mMapDetailFragment, "DetailFragment").addToBackStack("DetailFragment").commit();
    }


}

输出屏幕截图:

现在，当您单击该 DetailMap 按钮时，它会将用户带到详细信息屏幕，我只想在该 SupportMapFragment 中显示一个标记，但我不知道为什么它仍然显示我在第一个 fragment 中添加的所有标记。

我的第二个 fragment 代码:

public class MapDetailFragment extends Fragment {

    private GoogleMap mGoogleMapView;

    private SupportMapFragment mSupportMapDetail;

    private FragmentManager mFragMrg;

    private LatLng mLatnogGujOne=new LatLng(18.9158, 72.8267);

    private LatLngBounds.Builder mLatlongBuilder;

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

        View mView = inflater.inflate(R.layout.map_detail_screen, container,
                false);

        intView(mView);

        return mView;
    }

    private void intView(View mView) {

        mFragMrg=getChildFragmentManager();

        mSupportMapDetail=(SupportMapFragment) mFragMrg.findFragmentByTag("map_home_detail");



        if(mSupportMapDetail!=null){

            mGoogleMapView=mSupportMapDetail.getMap();

            if(mGoogleMapView!=null){

                mGoogleMapView.clear();

                mGoogleMapView.getUiSettings().setAllGesturesEnabled(true);

                mGoogleMapView.getUiSettings().setMyLocationButtonEnabled(true);

                mGoogleMapView.getUiSettings().setZoomGesturesEnabled(true);

                mGoogleMapView.getUiSettings().setZoomControlsEnabled(true);

                mGoogleMapView.setMyLocationEnabled(true);

                mLatlongBuilder=new LatLngBounds.Builder();

                MarkerOptions mMarkerOption=new MarkerOptions();

                mMarkerOption.title("Map One").position(mLatnogGujOne).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_pub)).snippet("My Name is");
                mLatlongBuilder.include(mLatnogGujOne);

                mGoogleMapView.addMarker(mMarkerOption);


                mGoogleMapView.animateCamera(CameraUpdateFactory.newLatLngBounds(mLatlongBuilder.build(), 120));

            }

        }

    }

}

这是我的 home_map.xml 的 xml 代码:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btn_mapdetail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/mapdetail" />

    <ViewSwitcher
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/viewSwitcher"
         >

        <LinearLayout
            android:id="@+id/llMapDemo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/txt"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

        </LinearLayout>

        <fragment
            android:id="@+id/map_home_fragment"
            android:name="com.google.android.gms.maps.SupportMapFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:tag="map_home_fragment" />
    </ViewSwitcher>

</LinearLayout>

另一个 xml 在这里 map_detail_screen.xml :

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:clickable="true" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/empty_photo" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/empty_photo" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/empty_photo" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/empty_photo" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/empty_photo" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/empty_photo" />

        <FrameLayout
            android:id="@+id/frame_detail"
            android:layout_width="match_parent"
            android:layout_height="350dp" >

            <fragment
                android:id="@+id/map_home_fragment_detail"
                android:name="com.google.android.gms.maps.SupportMapFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:tag="map_home_detail" />
        </FrameLayout>
    </LinearLayout>

</ScrollView>

这是我的第二个屏幕输出:

正如您在我的第二个屏幕上看到的那样，它仍然在 map 上显示标记 为什么会发生这种情况？

任何人都可以提供适当的解决方案，所以当我返回上一个屏幕时，所有标记都与我添加的一样。

Answer 1

替换

mSupportMapDetail=(SupportMapFragment) mFragMrg.findFragmentByTag("map_home_detail");

与

mSupportMapDetail=(SupportMapFragment) mFragMrg.findFragmentById("map_home_fragment_detail");

也尝试将 findFragmentByTag 替换为 findFragmentById 无处不在..