java - How to add map to a tabbed activity (Android) -
i have tabbed activity uses sectionspageadapter. there 2 tabs, each uses different fragment, 1 of google map. when attempt supportmapfragment mapfragment returns null.
supportmapfragment mapfragment = (supportmapfragment) getchildfragmentmanager() .findfragmentbyid(r.id.map); i have tried:
supportmapfragment mapfragment = (supportmapfragment) getfragmentmanager() .findfragmentbyid(r.id.map); if create new googlemapsactivity works fine, confirms has nothing key. fragment id map exists.
mainactivity.java
package com.example.frias19o.trackthem2; import android.support.design.widget.tablayout; import android.support.design.widget.floatingactionbutton; import android.support.design.widget.snackbar; import android.support.v7.app.appcompatactivity; import android.support.v7.widget.toolbar; import android.support.v4.view.viewpager; import android.os.bundle; import android.view.menu; import android.view.menuitem; import android.view.view; public class mainactivity extends appcompatactivity { private sectionspageradapter msectionspageradapter; private viewpager mviewpager; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar); setsupportactionbar(toolbar); // create adapter return fragment each of 3 // primary sections of activity. msectionspageradapter = new sectionspageradapter(getsupportfragmentmanager()); // set viewpager sections adapter. mviewpager = (viewpager) findviewbyid(r.id.container); mviewpager.setadapter(msectionspageradapter); tablayout tablayout = (tablayout) findviewbyid(r.id.tabs); tablayout.setupwithviewpager(mviewpager); floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab); fab.setonclicklistener(new view.onclicklistener() { @override public void onclick(view view) { snackbar.make(view, "replace own action", snackbar.length_long) .setaction("action", null).show(); } }); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.menu_map, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. action bar // automatically handle clicks on home/up button, long // specify parent activity in androidmanifest.xml. int id = item.getitemid(); //noinspection simplifiableifstatement if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); } } mapfragment.java
package com.example.frias19o.trackthem2; import android.content.intent; import android.os.bundle; import android.provider.settings; import android.support.annotation.nonnull; import android.support.annotation.nullable; import android.support.v4.app.fragment; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.toast; import com.google.android.gms.common.connectionresult; import com.google.android.gms.common.api.googleapiclient; import com.google.android.gms.location.locationservices; import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.onmapreadycallback; import com.google.android.gms.maps.supportmapfragment; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.markeroptions; import org.json.jsonexception; import org.json.jsonobject; /******************************************************************** * fragment map *********************************************************************/ public class mapfragment extends fragment implements onmapreadycallback { private static final string logtag = "mapfragment"; private static final string arg_section_number = "section_number"; public static googleapiclient mgoogleapiclient; private googlemap mmap; public mapfragment() { } public static mapfragment newinstance(int sectionnumber) { mapfragment fragment = new mapfragment(); bundle args = new bundle(); args.putint(arg_section_number, sectionnumber); fragment.setarguments(args); return fragment; } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view rootview; toast.maketext(getcontext(), "fragment_map", toast.length_short).show(); rootview = inflater.inflate(r.layout.activity_maps, container, false); return rootview; } @override public void onactivitycreated(@nullable bundle savedinstancestate) { super.onactivitycreated(savedinstancestate); supportmapfragment mapfragment = (supportmapfragment) getfragmentmanager() .findfragmentbyid(r.id.map); mapfragment.getmapasync(this); // brakes here because mapfragment null } @override public void onmapready(googlemap googlemap) { mmap = googlemap; log.v(logtag, "map ready"); latlng sydney = new latlng(-34, 151); mmap.addmarker(new markeroptions().position(sydney).title("marker in sydney")); mmap.movecamera(cameraupdatefactory.newlatlng(sydney)); log.v(logtag, "added sydney"); } } sectionspageradapter.java
package com.example.frias19o.trackthem2; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; /*********************************************************************** * {@link fragmentpageradapter} returns fragment corresponding * 1 of sections/tabs/pages. **********************************************************************/ public class sectionspageradapter extends fragmentpageradapter { public sectionspageradapter(fragmentmanager fm) { super(fm); } @override public fragment getitem(int position) { // getitem called instantiate fragment given page. // return clusterfragment (defined static inner class below). fragment fragment = null; switch (position) { case 0: fragment = mapfragment.newinstance(position + 1); break; case 1: fragment = clusterfragment.newinstance(position + 1); break; default: break; } return fragment; } @override public int getcount() { // show 2 total pages. return 2; } @override public charsequence getpagetitle(int position) { switch (position) { case 0: return "section 1"; case 1: return "section 2"; } return null; } }
note: code on link provided coomonsware in first comment on question, led me solution.
as pointed out commonsware, solution making mapfragment extend supportmapfragment, way getmapasync(this); can called directly (without having access fragmentmanager). return instance of mapfragment in getitem() of sectionspageradapter. note there should not call/override oncreateview(), caused java.lang.nullpointerexception: attempt invoke interface method 'void maps.ei.bz.o()' on null object reference
final product:
mapfragment.java
package com.example.frias19o.trackthem2; import android.os.bundle; import android.support.annotation.nullable; import android.util.log; import com.google.android.gms.common.api.googleapiclient; import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.onmapreadycallback; import com.google.android.gms.maps.supportmapfragment; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.markeroptions; /******************************************************************** * fragment map *********************************************************************/ public class mapfragment extends supportmapfragment implements onmapreadycallback { private static final string logtag = "mapfragment"; private googlemap mmap; public mapfragment() { } @override public void onactivitycreated(@nullable bundle savedinstancestate) { super.onactivitycreated(savedinstancestate); getmapasync(this); } @override public void onmapready(googlemap googlemap) { mmap = googlemap; log.v(logtag, "map ready"); latlng sydney = new latlng(-34, 151); mmap.addmarker(new markeroptions().position(sydney).title("marker in sydney")); mmap.movecamera(cameraupdatefactory.newlatlng(sydney)); log.v(logtag, "added sydney"); } } sectionspageradapter.java
package com.example.frias19o.trackthem2; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; /*********************************************************************** * {@link fragmentpageradapter} returns fragment corresponding * 1 of sections/tabs/pages. **********************************************************************/ public class sectionspageradapter extends fragmentpageradapter { public sectionspageradapter(fragmentmanager fm) { super(fm); } @override public fragment getitem(int position) { // getitem called instantiate fragment given page. // return clusterfragment (defined static inner class below). fragment fragment = null; switch (position) { case 0: fragment = new mapfragment(); break; case 1: fragment = clusterfragment.newinstance(position + 1); break; default: break; } return fragment; } @override public int getcount() { // show 2 total pages. return 2; } @override public charsequence getpagetitle(int position) { switch (position) { case 0: return "section 1"; case 1: return "section 2"; } return null; } } 
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