java - WebView Placed in a Fragment doesn't load -
let's start code. main activity:
package it.mdibonito.futuroremoto; import android.app.activity; import android.graphics.bitmap; 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.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; import android.support.v4.view.viewpager; import android.os.bundle; import android.view.keyevent; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup; import android.webkit.websettings; import android.webkit.webview; import android.webkit.webviewclient; import android.widget.textview; public class mainactivity extends appcompatactivity { /** * {@link android.support.v4.view.pageradapter} provide * fragments each of sections. use * {@link fragmentpageradapter} derivative, keep every * loaded fragment in memory. if becomes memory intensive, * may best switch * {@link android.support.v4.app.fragmentstatepageradapter}. */ private sectionspageradapter msectionspageradapter; /** * {@link viewpager} host section contents. */ 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); //set icons tabs after tablayout.setupwithviewpager(viewpager) int number_of_tabs = 5; //this fixed number of tabs in tablayout, returned *sectionspageradapter.getcount()* final int[] tabicons = new int[]{r.drawable.ic_format_list_bulleted_white_48dp, r.drawable.ic_add_location_white_48dp, r.drawable.ic_public_white_48dp, r.drawable.ic_share_white_48dp, r.drawable.ic_info_white_24dp}; for(int i=0;i<number_of_tabs;i++){ tablayout.gettabat(i).seticon(tabicons[i]); } 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_main, 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); } /** * placeholder fragment containing simple view. */ public static class placeholderfragment extends fragment { /** * fragment argument representing section number * fragment. */ private static final string arg_section_number = "section_number"; public placeholderfragment() { } /** * returns new instance of fragment given section * number. */ public static placeholderfragment newinstance(int sectionnumber) { placeholderfragment fragment = new placeholderfragment(); 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) { if (getarguments().getint(arg_section_number) == 1) { view rootview = inflater.inflate(r.layout.fragment_programma, container, false); return rootview; } else { if (getarguments().getint(arg_section_number) == 2) { view rootview = inflater.inflate(r.layout.fragment_programma, container, false); return rootview; } else if (getarguments().getint(arg_section_number) == 3) { view rootview = inflater.inflate(r.layout.fragment_programma, container, false); return rootview; } else if (getarguments().getint(arg_section_number) == 4) { view rootview = inflater.inflate(r.layout.fragment_programma, container, false); return rootview; } else if (getarguments().getint(arg_section_number) == 5) { view rootview = inflater.inflate(r.layout.fragment_programma, container, false); return rootview; } else { view rootview = inflater.inflate(r.layout.fragment_main, container, false); return rootview; } } } } /** * {@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 placeholderfragment (defined static inner class below). return placeholderfragment.newinstance(position + 1); } @override public int getcount() { // show 3 total pages. return 5; } @override public charsequence getpagetitle(int position) { switch (position) { case 0: return "programma"; case 1: return "mappe"; case 2: return "domes"; case 3: return "social"; case 4: return "info"; } return null; } } }this programma.java
package it.mdibonito.futuroremoto; import android.os.bundle; import android.support.v4.app.fragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.webkit.websettings; import android.webkit.webview; import android.widget.textview; /** * simple {@link fragment} subclass. */ public class programma extends fragment { public programma() { // required empty public constructor } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view rootview = inflater.inflate(r.layout.fragment_programma, container, false); webview heroespage = (webview) rootview.findviewbyid(r.id.progwebview); websettings websettings = heroespage.getsettings(); websettings.setjavascriptenabled(true); heroespage.loadurl("http://www.google.it/"); return rootview; }fragment_programma.xml
<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" tools:context="it.mdibonito.futuroremoto.programma"> <!-- todo: update blank fragment layout --> <webview android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/progwebview" android:layout_gravity="left|top" /> </framelayout>more details: i'm using standard android studio 2.1.3 tabbed activity style, , prefer keep it.as title, problem webview doesn't load anything, display white webview. of course, i've added permissions use internet android manifest... help?
1. in mywebclient you've overriden shouldoverrideurlloading() , return true.
this means don't want webview handle url, , you'll handle yourself.
if want webview load requested url, return false in `shouldoverrideurlloading(). or better, don't override @ all.
2. sure programma class started? activity, not fragment. use same layout (fragment_main) in both programmaactivity , in placeholderfragment. however, in programmaactivity loading url. placeholderfragment nothing webview
3. how placeholderfragment should like
public static class placeholderfragment extends fragment { /** * fragment argument representing section number * fragment. */ private static final string arg_section_number = "section_number";
public placeholderfragment() { } /** * returns new instance of fragment given section * number. */ public static placeholderfragment newinstance(int sectionnumber) { placeholderfragment fragment = new placeholderfragment(); 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 = inflater.inflate(r.layout.fragment_programma, container, false); webview heroespage = (webview) rootview.findviewbyid(r.id.progwebview); websettings websettings = heroespage.getsettings(); websettings.setjavascriptenabled(true); heroespage.loadurl("http://www.google.it/"); return rootview; } } 
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