eclipse - android app is crashing -

using big nerd ranch tutorial book , finished chapter or have 1 page left there points in quizactivity.java i'm not sure if i'm supposed delete.

my quizactivity.java is

package com.bignerdranch.android.geoquiz;  import android.os.bundle; import android.support.v4.app.fragment; import android.support.v7.app.actionbaractivity; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup; import android.widget.button; import android.widget.textview; import android.widget.toast;  public class quizactivity extends actionbaractivity {      private button mtruebutton;     private button mfalsebutton;     private button mnextbutton;     private textview mquestiontextview;      private truefalse[] mquestionbank = new truefalse [] {         new truefalse(r.string.question_oceans, true),         new truefalse(r.string.question_mideast, false),         new truefalse(r.string.question_africa, false),         new truefalse(r.string.question_americas, true),         new truefalse(r.string.question_asia, true),     };      private int mcurrentindex = 0;      private void updatequestion() {         int question = mquestionbank[mcurrentindex].getquestion();         mquestiontextview.settext(question);     }     private void checkanswer(boolean userpressedtrue) {        boolean answeristrue = mquestionbank[mcurrentindex].istruequestion();         int messageresid = 0;         if (userpressedtrue == answeristrue) {            messageresid = r.string.correct_toast;        } else {            messageresid = r.string.incorrect_toast;            }         toast.maketext(this, messageresid, toast.length_short)        .show();     }         @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_quiz);          mquestiontextview = (textview)findviewbyid(r.id.question_text_view);          mtruebutton = (button)findviewbyid(r.id.true_button);         mtruebutton.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 toast.maketext(quizactivity.this,                         r.string.correct_toast,                         toast.length_short).show();              }         });         mfalsebutton = (button)findviewbyid(r.id.false_button);         mfalsebutton.setonclicklistener(new view.onclicklistener() {              @override             public void onclick(view v) {                 toast.maketext(quizactivity.this,                         r.string.incorrect_toast,                         toast.length_short).show();              }         });           mnextbutton = (button)findviewbyid(r.id.next_button);         mnextbutton.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 mcurrentindex = (mcurrentindex + 1) % mquestionbank.length;             }         });                   updatequestion();              }       @override     public boolean oncreateoptionsmenu(menu menu) {          // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.quiz, 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();         if (id == r.id.action_settings) {             return true;         }         return super.onoptionsitemselected(item);     }      /**      * placeholder fragment containing simple view.      */     public static class placeholderfragment extends fragment {          public placeholderfragment() {         }          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                 bundle savedinstancestate) {             view rootview = inflater.inflate(r.layout.activity_quiz, container,                     false);             return rootview;         }     }  } 

my geoquiz manifest is

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.bignerdranch.android.geoquiz"     android:versioncode="1"     android:versionname="1.0" >      <uses-sdk         android:minsdkversion="8"         android:targetsdkversion="16" />      <application         android:allowbackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme" >         <activity             android:name="com.bignerdranch.android.geoquiz.quizactivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>     </application>  </manifest> 

my activity_quiz.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:gravity="center"     android:orientation="vertical"   >   <textview      android:id="@+id/question_text_view"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:padding="24dp" />   <button      android:id="@+id/next_button"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/next_button" />   <linearlayout      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:orientation="horizontal" >     <button        android:id="@+id/true_button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/true_button" />     <button     android:id="@+id/false_button"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/false_button" />    </linearlayout> </linearlayout> 

my truefalse.java

package com.bignerdranch.android.geoquiz;  public class truefalse {     private int mquestion;      private boolean mtruequestion;      public truefalse(int question, boolean truequestion) {         mquestion = getquestion();         mtruequestion = truequestion;     }      public int getquestion() {         return mquestion;     }      public void setquestion(int question) {         mquestion = question;     }      public boolean istruequestion() {         return mtruequestion;     }      public void settruequestion(boolean truequestion) {         mtruequestion = truequestion;     } } 

i believe you're getting resourcenotfoundexception,

please note array of quizactivity

private truefalse[] mquestionbank = new truefalse [] {         new truefalse(r.string.question_oceans, true),         new truefalse(r.string.question_mideast, false),         new truefalse(r.string.question_africa, false),         new truefalse(r.string.question_americas, true),         new truefalse(r.string.question_asia, true), }; 

the cause starts here,

private int mquestion; // default value of integer 0  public truefalse(int question, boolean truequestion) {          mquestion = getquestion(); // you're assigning assigning value of mquestion          mtruequestion = truequestion; } 

question parameter never been passed field mquestion.

to fix, must assign question mquestion variable.

public truefalse(int question, boolean truequestion) {              mquestion = question;              mtruequestion = truequestion; }