как я могу получить правильный контекст? - PullRequest
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как я могу получить правильный контекст?

0 голосов
/ 12 апреля 2020

встроенный в моем приложении, я использую вид карты в классе (не основной вид деятельности), код класса: 

public class first extends Fragment
{
    //map and map controller obj
    MapView map = null;
    IMapController mapController=null;
    public first() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        Context ctx = getActivity().getApplicationContext();
        // Inflate the layout for this fragment
        View view= inflater.inflate(R.layout.fragment_first, container, false);
        MapView map =view.findViewById(R.id.mapView);
        IMapController mapController = map.getController();
        map.setTileSource(TileSourceFactory.MAPNIK);
        map.setBuiltInZoomControls(true);
        map.setMultiTouchControls(true);

        GeoPoint startPoint = new GeoPoint(31.7775, 35.2327);
        mapController.setZoom(9);
        mapController.setCenter(startPoint);
        addMarker(startPoint);

        GeoPoint endPoint = new GeoPoint(31.78068,35.23669);
        addMarker(endPoint);
        ArrayList<GeoPoint> arrayList = new ArrayList<GeoPoint>();
        arrayList.add(startPoint);
        arrayList.add(endPoint);
        RoadManager roadManager = new OSRMRoadManager(container.getContext());

//        And retreive the road between those points:
    Road road = roadManager.getRoad(arrayList);
//        then, build a Polyline with the route shape:
        Polyline roadOverlay = RoadManager.buildRoadOverlay(road);
//        Add this Polyline to the overlays of your map:
    map.getOverlays().add(roadOverlay);
//        Refresh the map!
            map.invalidate();
return view;
    }
    //marker on the map func
    public void addMarker(GeoPoint geoPoint){
        Marker marker=new Marker(map);
        marker.setPosition(geoPoint);
        marker.setAnchor(Marker.ANCHOR_CENTER,Marker.ANCHOR_BOTTOM);
        marker.setIcon(getResources().getDrawable(R.drawable.ic_location_on_24px));
        map.getOverlays().add(marker);

    }

XML

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".first">

<!--    map view -->
    <org.osmdroid.views.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="476dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tablayout"
        tools:ignore="MissingConstraints"></org.osmdroid.views.MapView>

</FrameLayout>

ОШИБКА : 

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.oldcityview, PID: 27851
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context org.osmdroid.views.MapView.getContext()' on a null object reference
        at org.osmdroid.views.overlay.Marker.<init>(Marker.java:93)
        at com.example.oldcityview.first.addMarker(first.java:113)
        at com.example.oldcityview.first.onCreateView(first.java:50)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2698)
        at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:310)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1185)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1354)
        at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1432)
        at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:442)
        at androidx.fragment.app.FragmentManager.executeOps(FragmentManager.java:2167)
        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1990)
        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1945)
        at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1816)
        at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:303)
        at androidx.fragment.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:238)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1244)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
        at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
        at android.view.View.measure(View.java:24530)
        at androidx.constraintlayout.widget.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java:1227)
        at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1572)
        at android.view.View.measure(View.java:24530)
        at androidx.drawerlayout.widget.DrawerLayout.onMeasure(DrawerLayout.java:1119)
        at android.view.View.measure(View.java:24530)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
        at android.view.View.measure(View.java:24530)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
        at android.view.View.measure(View.java:24530)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at android.view.View.measure(View.java:24530)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
        at android.view.View.measure(View.java:24530)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6828)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:742)
        at android.view.View.measure(View.java:24530)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3006)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1833)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2122)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1721)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7598)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:966)
        at android.view.Choreographer.doCallbacks(Choreographer.java:790)
        at android.view.Choreographer.doFrame(Choreographer.java:725)
E/AndroidRuntime:     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:951)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

как получить правильный контекст?

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