android - SupportMapFragment.getMap() on a null object reference -
after trying everything, cannot seem getmap without pulling null object reference. trying inflate google mapfragment fragment, each time keep getmap null object .
here code
i'm desperate @ point, i've tried everything.
error
java.lang.nullpointerexception: attempt invoke virtual method 'com.google.android.gms.maps.googlemap com.google.android.gms.maps.supportmapfragment.getmap()' on null object reference @ com.gnumbu.errolgreen.importedapplication.viewmapfragment.onviewcreated(viewmapfragment.java:122) @ android.support.v4.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:971) @ android.support.v4.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:1136) @ android.support.v4.app.backstackrecord.run(backstackrecord.java:739) @ android.support.v4.app.fragmentmanagerimpl.execpendingactions(fragmentmanager.java:1499) @ android.support.v4.app.fragmentmanagerimpl.executependingtransactions(fragmentmanager.java:488) @ android.support.v4.app.fragmentpageradapter.finishupdate(fragmentpageradapter.java:141) @ android.support.v4.view.viewpager.populate(viewpager.java:1073) @ android.support.v4.view.viewpager.populate(viewpager.java:919) @ android.support.v4.view.viewpager.onmeasure(viewpager.java:1441) @ android.view.view.measure(view.java:17430) @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5463) @ android.widget.framelayout.onmeasure(framelayout.java:430) @ android.view.view.measure(view.java:17430) @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5463) @ android.support.v7.internal.widget.actionbaroverlaylayout.onmeasure(actionbaroverlaylayout.java:453) @ android.view.view.measure(view.java:17430) @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5463) @ android.widget.framelayout.onmeasure(framelayout.java:430) @ android.view.view.measure(view.java:17430) @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5463) @ android.widget.linearlayout.measurechildbeforelayout(linearlayout.java:1436) @ android.widget.linearlayout.measurevertical(linearlayout.java:722) @ android.widget.linearlayout.onmeasure(linearlayout.java:613) @ android.view.view.measure(view.java:17430) @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5463) @ android.widget.framelayout.onmeasure(framelayout.java:430) @ com.android.internal.policy.impl.phonewindow$decorview.onmeasure(phonewindow.java:2560) @ android.view.view.measure(view.java:17430) @ android.view.viewrootimpl.performmeasure(viewrootimpl.java:2001) @ android.view.viewrootimpl.measurehierarchy(viewrootimpl.java:1166) @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:1372) @ android.view.viewrootimpl.dotraversal(viewrootimpl.java:1054) @ android.view.viewrootimpl$traversalrunnable.run(viewrootimpl.java:5779) @ android.view.choreographer$callbackrecord.run(choreographer.java:767) @ android.view.choreographer.docallbacks(choreographer.java:580) @ android.view.choreographer.doframe(choreographer.java:550) @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:753) @ android.os.handler.handlecallback(handler.java:739) @ android.os.handler.dispatchmessage(handler.java:95) @ android.os.looper.loop(looper.java:135) @ android.app.activitythread.main(activitythread.java:5221) @ java.lang.reflect.method.invoke(native method) @ java.lang.reflect.method.invoke(method.java:372) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694) fragment java 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 latitude & longitude. please change per need. used drop marker on map latitude = 26.78; longitude = 72.56; ; // setting mapfragment return view; } /***** sets map if possible *****/ public static void setupmapifneeded() { // null check confirm have not instantiated map. if (mmap == null) { // try obtain map supportmapfragment. mmap = ((supportmapfragment) sectionspageradapter.fragmentmanager .findfragmentbyid(r.id.mapview)).getmap(); // check if successful in obtaining map. if (mmap != null) setupmap(); } } /** * can add markers or lines, add listeners or move * camera. * <p> * should called once , when sure {@link #mmap} * not null. */ private static void setupmap() { // showing move loction button mmap.setmylocationenabled(true); // dropping marker @ point on map mmap.addmarker(new markeroptions().position(new latlng(latitude, longitude)).title("my home").snippet("home address")); // zooming automatically 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 obtain map supportmapfragment. mmap = ((supportmapfragment) mainactivity.fragmentmanager .findfragmentbyid(r.id.mapview)).getmap(); // getmap deprecated // check if successful in obtaining 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(); } /**** mapfragment's id must removed fragmentmanager **** or else if same passed on next time **** app 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 object of fragmentmanager. here i'm passing getsupportfragmentmanager(). can pass getfragmentmanager() if coding 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 adapter return fragment each section/page msectionspageradapter = new sectionspageradapter( this.getbasecontext(), getsupportfragmentmanager()); fragmentmanager = getsupportfragmentmanager(); // set viewpager 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); } }); // each of sections in app, add tab action bar. /* (int = 0; < msectionspageradapter.getcount(); i++) { // create tab text corresponding page title defined // adapter. specify activity object, implements // tablistener interface, callback (listener) when // tab 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); }
not sure why downvoted on this, have solved issue.
this line
mmap = ((supportmapfragment) mainactivity.fragmentmanager .findfragmentbyid(r.id.mapview)).getmap(); needed changed
mmap = ((supportmapfragment) getchildfragmentmanager() .findfragmentbyid(r.id.mapview)).getmap(); 
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