java - Error inflating class fragment While testing out fragment Activity -
i'm trying test out activity implement fragments.
when try run app error:
error inflating class fragment
ive read happens if extends activity instead of fragmentactivity in main activity, inherit right thing in activity itself. might problem ?
my activity :
package apps.radwin.zxingprojectfragmenttwo; import android.os.bundle; import android.support.v4.app.fragment; import android.support.v4.app.fragmentactivity; import android.support.v4.app.fragmentmanager; import android.view.view; public class mainactivity extends fragmentactivity { @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); } public void selectfrag(view view) { fragment objfragment = new fragmentone(); fragmentmanager fragmentmanager = getsupportfragmentmanager(); fragmentmanager.begintransaction() .replace(r.id.fragment_two_id, objfragment) .commit(); } } activity layout:
<?xml version="1.0" encoding="utf-8"?> <relativelayout 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" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context="apps.radwin.zxingprojectfragmenttwo.mainactivity"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="hello world!" android:id="@+id/textview6" /> <fragment android:id="@+id/fragment_one_id" android:name="apps.radwin.zxingprojectfragmenttwo.fragmentone" android:layout_width="wrap_content" android:layout_height="wrap_content" tools:layout="@layout/fragment_fragment_one" android:layout_below="@+id/fragment_two_id" android:layout_alignparentleft="true" android:layout_alignparentstart="true" /> <fragment android:id="@+id/fragment_two_id" android:name="apps.radwin.zxingprojectfragmenttwo.fragmenttwo" android:layout_width="wrap_content" android:layout_height="wrap_content" tools:layout="@layout/fragment_fragment_two" android:layout_below="@+id/textview6" android:layout_alignparentleft="true" android:layout_alignparentstart="true" /> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="activity button change first" android:id="@+id/button2" android:onclick="selectfrag" android:layout_below="@+id/fragment_one_id" android:layout_alignparentleft="true" android:layout_alignparentstart="true" /> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="activity button change second" android:id="@+id/button1" android:onclick="selectfrag" android:layout_below="@+id/button2" android:layout_alignparentleft="true" android:layout_alignparentstart="true" /> </relativelayout> full stack trace:
fatal exception: main process: apps.radwin.zxingprojectfragmenttwo, pid: 23530 java.lang.runtimeexception: unable start activity componentinfo { apps.radwin.zxingprojectfragmenttwo / apps.radwin.zxingprojectfragmenttwo.mainactivity }: android.view.inflateexception: binary xml file line #19: binary xml file line # 19: error inflating class fragment @ android.app.activitythread.performlaunchactivity(activitythread.java: 3253) @ android.app.activitythread.handlelaunchactivity(activitythread.java: 3349) @ android.app.activitythread.access$1100(activitythread.java: 221) @ android.app.activitythread$h.handlemessage(activitythread.java: 1794) @ android.os.handler.dispatchmessage(handler.java: 102) @ android.os.looper.loop(looper.java: 158) @ android.app.activitythread.main(activitythread.java: 7224) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java: 1230) @ com.android.internal.os.zygoteinit.main(zygoteinit.java: 1120) caused by: android.view.inflateexception: binary xml file line #19: binary xml file line # 19: error inflating class fragment @ android.view.layoutinflater.inflate(layoutinflater.java: 551) @ android.view.layoutinflater.inflate(layoutinflater.java: 429) @ android.view.layoutinflater.inflate(layoutinflater.java: 380) @ com.android.internal.policy.phonewindow.setcontentview(phonewindow.java: 474) @ android.app.activity.setcontentview(activity.java: 2387) @ apps.radwin.zxingprojectfragmenttwo.mainactivity.oncreate(mainactivity.java: 15) @ android.app.activity.performcreate(activity.java: 6876) @ android.app.instrumentation.callactivityoncreate(instrumentation.java: 1135) @ android.app.activitythread.performlaunchactivity(activitythread.java: 3206) @ android.app.activitythread.handlelaunchactivity(activitythread.java: 3349) @ android.app.activitythread.access$1100(activitythread.java: 221) @ android.app.activitythread$h.handlemessage(activitythread.java: 1794) @ android.os.handler.dispatchmessage(handler.java: 102) @ android.os.looper.loop(looper.java: 158) @ android.app.activitythread.main(activitythread.java: 7224) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java: 1230) @ com.android.internal.os.zygoteinit.main(zygoteinit.java: 1120) caused by: android.view.inflateexception: binary xml file line #19: error inflating class fragment @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:794) @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:716) @ android.view.layoutinflater.rinflate(layoutinflater.java:847) @ android.view.layoutinflater.rinflatechildren(layoutinflater.java:810) @ android.view.layoutinflater.inflate(layoutinflater.java:527) @ android.view.layoutinflater.inflate(layoutinflater.java:429) @ android.view.layoutinflater.inflate(layoutinflater.java:380) @ com.android.internal.policy.phonewindow.setcontentview(phonewindow.java:474) @ android.app.activity.setcontentview(activity.java:2387) @ apps.radwin.zxingprojectfragmenttwo.mainactivity.oncreate(mainactivity.java:15) @ android.app.activity.performcreate(activity.java:6876) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1135) @ android.app.activitythread.performlaunchactivity(activitythread.java:3206) @ android.app.activitythread.handlelaunchactivity(activitythread.java:3349) @ android.app.activitythread.access$1100(activitythread.java:221) @ android.app.activitythread$h.handlemessage(activitythread.java:1794) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:158) @ android.app.activitythread.main(activitythread.java:7224) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1230) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1120) caused by: java.lang.runtimeexception: apps.radwin.zxingprojectfragmenttwo.mainactivity@44cf550 must implement onfragmentinteractionlistener @ apps.radwin.zxingprojectfragmenttwo.fragmentone.onattach(fragmentone.java:83) @ android.support.v4.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:1019) @ android.support.v4.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:1230) @ android.support.v4.app.fragmentmanagerimpl.addfragment(fragmentmanager.java:1332) @ android.support.v4.app.fragmentmanagerimpl.oncreateview(fragmentmanager.java:2288) @ android.support.v4.app.fragmentcontroller.oncreateview(fragmentcontroller.java:120) @ android.support.v4.app.fragmentactivity.dispatchfragmentsoncreateview(fragmentactivity.java:356) @ android.support.v4.app.basefragmentactivityhoneycomb.oncreateview(basefragmentactivityhoneycomb.java:31) @ android.support.v4.app.fragmentactivity.oncreateview(fragmentactivity.java:79) @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:766) @ android.view.layoutinflater.createviewfromtag(layoutinflater.java:716) @ android.view.layoutinflater.rinflate(layoutinflater.java:847) @ android.view.layoutinflater.rinflatechildren(layoutinflater.java:810) @ android.view.layoutinflater.inflate(layoutinflater.java:527) @ android.view.layoutinflater.inflate(layoutinflater.java:429) @ android.view.layoutinflater.inflate(layoutinflater.java:380) @ com.android.internal.policy.phonewindow.setcontentview(phonewindow.java:474) @ android.app.activity.setcontentview(activity.java:2387) @ apps.radwin.zxingprojectfragmenttwo.mainactivity.oncreate(mainactivity.java:15) @ android.app.activity.performcreate(activity.java:6876) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1135) @ android.app.activitythread.performlaunchactivity(activitythread.java:3206) @ android.app.activitythread.handlelaunchactivity(activitythread.java:3349) @ android.app.activitythread.access$1100(activitythread.java:221) @ android.app.activitythread$h.handlemessage(activitythread.java:1794) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:158) @ android.app.activitythread.main(activitythread.java:7224) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1230) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1120) my fragmentone class:
package apps.radwin.zxingprojectfragmenttwo; import android.content.context; import android.net.uri; import android.os.bundle; import android.support.v4.app.fragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; /** * simple {@link fragment} subclass. * activities contain fragment must implement * {@link fragmentone.onfragmentinteractionlistener} interface * handle interaction events. * use {@link fragmentone#newinstance} factory method * create instance of fragment. */ public class fragmentone extends fragment { // todo: rename parameter arguments, choose names match // fragment initialization parameters, e.g. arg_item_number private static final string arg_param1 = "param1"; private static final string arg_param2 = "param2"; // todo: rename , change types of parameters private string mparam1; private string mparam2; private onfragmentinteractionlistener mlistener; public fragmentone() { // required empty public constructor } /** * use factory method create new instance of * fragment using provided parameters. * * @param param1 parameter 1. * @param param2 parameter 2. * @return new instance of fragment fragmentone. */ // todo: rename , change types , number of parameters public static fragmentone newinstance(string param1, string param2) { fragmentone fragment = new fragmentone(); bundle args = new bundle(); args.putstring(arg_param1, param1); args.putstring(arg_param2, param2); fragment.setarguments(args); return fragment; } @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); if (getarguments() != null) { mparam1 = getarguments().getstring(arg_param1); mparam2 = getarguments().getstring(arg_param2); } } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { // inflate layout fragment return inflater.inflate(r.layout.fragment_fragment_one, container, false); } // todo: rename method, update argument , hook method ui event public void onbuttonpressed(uri uri) { if (mlistener != null) { mlistener.onfragmentinteraction(uri); } } @override public void onattach(context context) { super.onattach(context); if (context instanceof onfragmentinteractionlistener) { mlistener = (onfragmentinteractionlistener) context; } else { throw new runtimeexception(context.tostring() + " must implement onfragmentinteractionlistener"); } } @override public void ondetach() { super.ondetach(); mlistener = null; } /** * interface must implemented activities contain * fragment allow interaction in fragment communicated * activity , potentially other fragments contained in * activity. * <p/> * see android training lesson <a href= * "http://developer.android.com/training/basics/fragments/communicating.html" * >communicating other fragments</a> more information. */ public interface onfragmentinteractionlistener { // todo: update argument type , name void onfragmentinteraction(uri uri); } }
the problem in fragment's onattach():
if (context instanceof onfragmentinteractionlistener) { mlistener = (onfragmentinteractionlistener) context; } else { throw new runtimeexception(context.tostring() + " must implement onfragmentinteractionlistener"); } you're checking if context fragment attached (mainactivity in case) implements onfragmentinteractionlistener, not, runtimeexception thrown.
depending on achieve either remove code above onattach(), or make activity implement onfragmentinteractionlistener.
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