android - Application crashes when pressing the button -

i have struggled find solution couple of days , has drive me nuts. following tutorial in http://developer.android.com/guide/topics/ui/actionbar.html#actionitems

unfortunately application crashes when send button pressed (it working fine before action bar implemented)

here involved files:

1. androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.mycompany.myfirstapps" >     <uses-sdk android:minsdkversion="7"     android:targetsdkversion="18" />      <application         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:theme="@style/theme.appcompat.light.darkactionbar">          <!-- parent activity-->         <activity             android:name=".myactivity"             android:label="@string/app_name">              <intent-filter>                 <action android:name="android.intent.action.main" />                 <category android:name="android.intent.category.launcher" />             </intent-filter>          </activity>          <!--second activity -->         <activity             android:name=".displaymessageactivity"             android:label="@string/title_activity_display_message"             android:parentactivityname=".myactivity" >             <meta-data                 android:name="android.support.parent_activity"                 android:value=".myactivity" />         </activity>       </application>  </manifest> ​ 

2. myactivity.java

package com.mycompany.myfirstapps;  import android.os.bundle; import android.support.v7.app.actionbaractivity; import android.support.v7.app.appcompatactivity; import android.view.menu; import android.view.menuinflater; import android.view.menuitem; import android.view.view; import android.content.intent; import android.widget.edittext;   public class myactivity extends appcompatactivity {     public final static string extra_message="com.mycompany.myfirstapps.message";      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         getsupportactionbar().setdisplayhomeasupenabled(true);          // if minsdkversion 11 or higher, instead use:         //getactionbar().setdisplayhomeasupenabled(true);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu items use in action bar         menuinflater inflater = getmenuinflater();         inflater.inflate(r.menu.main_activity_actions, menu);         return super.oncreateoptionsmenu(menu);     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle presses on action bar items         switch (item.getitemid()) {             case r.id.action_search:                 opensearch();                 return true;             case r.id.action_settings:                 opensettings();                 return true;             default:                 return super.onoptionsitemselected(item);         }     }      //called when user click button     public void sendmessage(view view){         intent intent = new intent(this,displaymessageactivity.class);         edittext edittext=(edittext)findviewbyid(r.id.edit_message);         string message=edittext.gettext().tostring();         intent.putextra(extra_message,message);         startactivity(intent);     }       private void opensearch() {      //do     }       private void opensettings() { //do     }  } ​ 

3. displaymessageactivity.java

package com.mycompany.myfirstapps;  import android.content.intent; import android.os.bundle; import android.support.v7.app.appcompatactivity; import android.view.menu; import android.view.menuitem; import android.widget.textview;       public class displaymessageactivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         intent intent= getintent();          //create text view         string message=intent.getstringextra(myactivity.extra_message);         textview textview= new textview(this);         textview.settextsize(40);         textview.settext(message);          //set text view activity layout         setcontentview(textview);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.menu_display_message, 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);     } } 

4. activity_main.xml

<linearlayout 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:orientation="horizontal" android:theme="@style/customactionbartheme">  <edittext     android:id="@+id/edit_message"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:hint="@string/edit_message"/>  <button     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/button_send"     android:onclick="sendmessage"/>  </linearlayout> 

5. build.gradle

apply plugin: 'com.android.application'  android {     compilesdkversion 22     buildtoolsversion "22.0.1"      defaultconfig {         applicationid "com.mycompany.myfirstapps"         minsdkversion 8         targetsdkversion 22         versioncode 1         versionname "1.0"     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:appcompat-v7:22.1.1' } ​ 

logcat

05-14 22:57:03.139    2514-2562/android.process.acore i/contactlocale﹕ addressbook labels [en-us]: [, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, Α, Β, Γ, Δ, Ε, Ζ, Η, Θ, Ι, Κ, Λ, Μ, Ν, Ξ, Ο, Π, Ρ, Σ, Τ, Υ, Φ, Χ, Ψ, Ω, , А, Б, В, Г, Д, Ђ, Е, Є, Ж, З, И, І, Ї, Й, Ј, К, Л, Љ, М, Н, Њ, О, П, Р, С, Т, Ћ, У, Ф, Х, Ц, Ч, Џ, Ш, Щ, Ю, Я, , א, ב, ג, ד, ה, ו, ז, ח, ט, י, כ, ל, מ, נ, ס, ע, פ, צ, ק, ר, ש, ת, , ا, ب, ت, ث, ج, ح, خ, د, ذ, ر, ز, س, ش, ص, ض, ط, ظ, ع, غ, ف, ق, ك, ل, م, ن, ه, و, ي, , ก, ข, ฃ, ค, ฅ, ฆ, ง, จ, ฉ, ช, ซ, ฌ, ญ, ฎ, ฏ, ฐ, ฑ, ฒ, ณ, ด, ต, ถ, ท, ธ, น, บ, ป, ผ, ฝ, พ, ฟ, ภ, ม, ย, ร, ฤ, ล, ฦ, ว, ศ, ษ, ส, ห, ฬ, อ, ฮ, , ㄱ, ㄴ, ㄷ, ㄹ, ㅁ, ㅂ, ㅅ, ㅇ, ㅈ, ㅊ, ㅋ, ㅌ, ㅍ, ㅎ, , あ, か, さ, た, な, は, ま, や, ら, わ, #, ] 05-14 22:57:05.181    2514-2532/android.process.acore v/backupservicebinder﹕ dobackup() invoked 05-14 22:57:05.508    2514-2532/android.process.acore i/art﹕ waitforgctocomplete blocked 267.334ms cause disablemovinggc 05-14 22:57:05.619    2514-2532/android.process.acore e/dictionarybackupagent﹕ couldn't read cursor 05-14 22:57:05.722    2514-2562/android.process.acore i/art﹕ waitforgctocomplete blocked 357.236ms cause disablemovinggc 05-15 01:35:32.770    2514-2525/android.process.acore w/art﹕ suspending threads took: 57.246ms 05-15 01:35:35.813    2514-2527/android.process.acore e/strictmode﹕ resource acquired @ attached stack trace never released. see java.io.closeable information on avoiding resource leaks.     java.lang.throwable: explicit termination method 'close' not called             @ dalvik.system.closeguard.open(closeguard.java:184)             @ android.os.parcelfiledescriptor.<init>(parcelfiledescriptor.java:180)             @ android.os.parcelfiledescriptor$1.createfromparcel(parcelfiledescriptor.java:916)             @ android.os.parcelfiledescriptor$1.createfromparcel(parcelfiledescriptor.java:906)             @ android.app.ibackupagent$stub.ontransact(ibackupagent.java:57)             @ android.os.binder.exectransact(binder.java:446) 05-15 01:35:35.925    2514-2527/android.process.acore e/strictmode﹕ resource acquired @ attached stack trace never released. see java.io.closeable information on avoiding resource leaks.     java.lang.throwable: explicit termination method 'close' not called             @ dalvik.system.closeguard.open(closeguard.java:184)             @ android.os.parcelfiledescriptor.<init>(parcelfiledescriptor.java:180)             @ android.os.parcelfiledescriptor$1.createfromparcel(parcelfiledescriptor.java:916)             @ android.os.parcelfiledescriptor$1.createfromparcel(parcelfiledescriptor.java:906)             @ android.app.ibackupagent$stub.ontransact(ibackupagent.java:64)             @ android.os.binder.exectransact(binder.java:446) 05-15 01:35:36.578    2514-2527/android.process.acore e/strictmode﹕ resource acquired @ attached stack trace never released. see java.io.closeable information on avoiding resource leaks.     java.lang.throwable: explicit termination method 'close' not called             @ dalvik.system.closeguard.open(closeguard.java:184)             @ android.os.parcelfiledescriptor.<init>(parcelfiledescriptor.java:180)             @ android.os.parcelfiledescriptor$1.createfromparcel(parcelfiledescriptor.java:916)             @ android.os.parcelfiledescriptor$1.createfromparcel(parcelfiledescriptor.java:906)             @ android.app.ibackupagent$stub.ontransact(ibackupagent.java:71)             @ android.os.binder.exectransact(binder.java:446) ​ 

what wrong?

move edittext inside of oncreate() method in myactivity.java

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      edittext edittext=(edittext)findviewbyid(r.id.edit_message);     getsupportactionbar().setdisplayhomeasupenabled(true);       // if minsdkversion 11 or higher, instead use:     //getactionbar().setdisplayhomeasupenabled(true); } 

and inside sendmessage() method, remove line.

edit: seems you're extending new appcompatactivity. try changing actionbaractivity in both activities. example:

public class myactivity extends actionbaractivity {...} public class displaymessageactivity extends actionbaractivity {...} 

edit: if you're planning on not using actionbaractivity, need define custom toolbar , initialze this..

toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar); setsupportactionbar(toolbar); getsupportactionbar().setdisplayhomeasupenabled(true);