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SupportMapFragment.getMap () for reference to null object

Having tried almost everything, I cannot get getmap without pulling out a reference to the null object. I try to inflate a google map fragment into a fragment, but every time I do this, I always save the getmap object null.

Here is my code

I desperately need any help at this stage, I tried almost everything.

Error

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.SupportMapFragment.getMap()' on a null object reference at com.gnumbu.errolgreen.importedapplication.ViewMapFragment.onViewCreated(ViewMapFragment.java:122) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:971) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1136) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1499) at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:488) at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) at android.support.v4.view.ViewPager.populate(ViewPager.java:1073) at android.support.v4.view.ViewPager.populate(ViewPager.java:919) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560) at android.view.View.measure(View.java:17430) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Java fragment class

 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (container == null) { return null; } view = (RelativeLayout) inflater.inflate(R.layout.fragmentmenu_layout, container, false); // Passing harcoded values for latitude & longitude. Please change as per your need. This is just used to drop a Marker on the Map latitude = 26.78; longitude = 72.56; ; // For setting up the MapFragment return view; } /***** Sets up the map if it is possible to do so *****/ public static void setUpMapIfNeeded() { // Do a null check to confirm that we have not already instantiated the map. if (mMap == null) { // Try to obtain the map from the SupportMapFragment. mMap = ((SupportMapFragment) SectionsPagerAdapter.fragmentManager .findFragmentById(R.id.mapView)).getMap(); // Check if we were successful in obtaining the map. if (mMap != null) setUpMap(); } } /** * This is where we can add markers or lines, add listeners or move the * camera. * <p> * This should only be called once and when we are sure that {@link #mMap} * is not null. */ private static void setUpMap() { // For showing a move to my loction button mMap.setMyLocationEnabled(true); // For dropping a marker at a point on the Map mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("My Home").snippet("Home Address")); // For zooming automatically to the Dropped PIN Location mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude), 12.0f)); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { // TODO Auto-generated method stub if (mMap != null) setUpMap(); if (mMap == null) { // Try to obtain the map from the SupportMapFragment. mMap = ((SupportMapFragment) MainActivity.fragmentManager .findFragmentById(R.id.mapView)).getMap(); // getMap is deprecated // Check if we were successful in obtaining the map. if (mMap != null) setUpMap(); getAllFeaturedItems(); captureMapScreen(); } } @Override public void onStart() { super.onStart(); } @Override public void onResume() { super.onResume(); setUpMapIfNeeded(); } @Override public void onPause() { super.onPause(); } @Override public void onStop() { super.onStop(); } @Override public void onLowMemory() { super.onLowMemory(); } /**** The mapfragment id must be removed from the FragmentManager **** or else if the same it is passed on the next time then **** app will crash ****/ @Override public void onDestroyView() { super.onDestroyView(); if (mMap != null) { MainActivity.fragmentManager.beginTransaction() .remove(MainActivity.fragmentManager.findFragmentById(R.id.mapView)).commit(); mMap = null; } } @Override public void onDestroy() { super.onDestroy(); }

fragmentmenu_layout.xml

  <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:translationZ="5dp" > <ListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/listViewMenu" android:layout_gravity="center_horizontal" android:dividerHeight="1sp" android:translationZ="5dp" android:divider="@color/background_default" android:background="@color/background_white" android:clickable="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_below="@+id/screenShotMapView" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/screenShotMapView" android:layout_alignParentTop="true" android:maxWidth="50dp" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:adjustViewBounds="true" android:translationZ="5dp" /> <fragment class="com.google.android.gms.maps.MapFragment" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/mapView" android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:adjustViewBounds="true" android:longClickable="false" android:visibility="visible" android:maxHeight="50dp" android:maxWidth="50dp" /> </RelativeLayout>

MainActivity.java

 public static FragmentManager fragmentManager; @Override protected void onCreate(Bundle savedInstanceState) { // setTheme(R.style.ActionBarTheme); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // initialising the object of the FragmentManager. Here I'm passing getSupportFragmentManager(). You can pass getFragmentManager() if you are coding for Android 3.0 or above. // final ActionBar actionBar = getSupportActionBar(); buildGoogleApiClient(); // actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); mImageBitmap = null; // Create the adapter that will return a fragment for each section/page mSectionsPagerAdapter = new SectionsPagerAdapter( this.getBaseContext(), getSupportFragmentManager()); fragmentManager = getSupportFragmentManager(); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mSectionsPagerAdapter); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { // actionBar.setSelectedNavigationItem(position); } }); // For each of the sections in the app, add a tab to the action bar. /* for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { // Create a tab with text corresponding to the page title defined by // the adapter. Also specify this Activity object, which implements // the TabListener interface, as the callback (listener) for when // this tab is selected. if (i == 0) { actionBar.addTab( actionBar.newTab() .setIcon(R.drawable.ic_action_view_as_list) // .setText(mSectionsPagerAdapter.getPageTitle(i)) .setTabListener(this) ); } if (i == 1) { actionBar.addTab( actionBar.newTab() .setIcon(R.drawable.ic_action_web_site_dark) // .setText(mSectionsPagerAdapter.getPageTitle(i)) .setTabListener(this) ); } } */ mAlbumStorageDirFactory = new BaseAlbumDirFactory(); Intent intent = new Intent(this, SplashScreen.class); startActivity(intent); }
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4 answers

Not too sure why I went down so much, but I solved the problem.

This line

 mMap = ((SupportMapFragment) MainActivity.fragmentManager .findFragmentById(R.id.mapView)).getMap();

need to change to

  mMap = ((SupportMapFragment) getChildFragmentManager() .findFragmentById(R.id.mapView)).getMap();
+25
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android: name = should be changed to "com.google.android.gms.maps.SupportMapFragment" ie

WITH

 <fragment android:name="com.google.android.gms.maps.MapFragment" android:layout_width="match_parent" android:layout_height="match_parent"/>

to

 <fragment android:name="com.google.android.gms.maps.SupportMapFragment" android:layout_width="match_parent" android:layout_height="match_parent"/>
+6
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The problem is that you are trying to get a map from SupportMapFragment , but you are using a different type of MapFragment , which looks good in xml

 class="com.google.android.gms.maps.MapFragment"

It should be

 class="com.google.android.gms.maps.SupportMapFragment"

So that you can initialize the type of SupportMapFragment from your code

+4
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I changed getMap() to getMapAsync(OnMapReadyCallback) and it worked.

Source: SupportMapFragment

+1
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Source: https://habr.com/ru/post/985976/

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