android - Custom Navigation drawer without ListView and ActionBar -

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i use navigation drawer in app, should [this]: http://godpowerturbo.com/app/uploads/nav.png [a], make design have used imagebutton in place of listview plus i'm not using fragments , open navigation drawer on imagebutton click exits null pointer exception.

i have searched everywhere on google , stackoverflow couldn't fix error.

this main activity

   drawerlayout dw;    percentrelativelayout rl;    imagebutton nav;        @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         log.d(tag, "oncreate()");         session session = new session(mctx);         log.e(tag, "log_id: " + session.getlogid());         session.putall();         rl = (percentrelativelayout) findviewbyid(r.id.nav_left);         dw = (drawerlayout) findviewbyid(r.id.nav_drawer);         nav = (imagebutton) findviewbyid(r.id.nav_menu);         nav.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) { //opening drawer returns null pointer exception                 log.e(tag, "nav menu click!");                 dw.opendrawer(gravity.left);             }         });     }

navigation drawer layout

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/nav_drawer"     android:background="@drawable/nav"     android:layout_width="match_parent"     android:layout_height="match_parent">      <android.support.percent.percentrelativelayout         xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         android:id="@+id/nav_left"         android:paddingleft="8dp"         android:paddingtop="65dp"         android:layout_gravity="left"         android:layout_width="match_parent"         android:layout_height="match_parent">          <imagebutton             android:background="@android:color/transparent"             android:layout_alignparentleft="true"             android:id="@+id/nav_home"             android:layout_width="95dp"             android:layout_height="35dp" />          <android.support.percent.percentrelativelayout             xmlns:app="http://schemas.android.com/apk/res-auto"             android:layout_below="@+id/nav_home"             android:id="@+id/lay_min"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:paddingtop="5dp"             android:paddingleft="10dp">              <imagebutton                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_catalogue"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_catalogue"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_upcomingevents"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_upcomingevents"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_newlaunch"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_newlaunch"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_turbofailure"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_turbofailure"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_aboutus"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_aboutus"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_enquiry"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_enquiry"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_faq"                 android:layout_width="205dp"                 android:layout_height="30dp" />              <imagebutton                 android:layout_below="@+id/nav_faq"                 android:background="@android:color/transparent"                 android:layout_alignparentleft="true"                 android:id="@+id/nav_feedback"                 android:layout_width="205dp"                 android:layout_height="30dp" />          </android.support.percent.percentrelativelayout>          <view             android:id="@+id/lazy_view"             android:layout_below="@id/lay_min"             android:background="@android:color/transparent"             android:layout_width="100dp"             android:layout_height="130dp" />          <imagebutton             android:layout_below="@+id/lazy_view"             android:background="@android:color/transparent"             android:layout_alignparentleft="true"             android:id="@+id/nav_back"             android:layout_width="75dp"             android:layout_height="40dp" />          <imagebutton             android:layout_below="@+id/nav_back"             android:background="@android:color/transparent"             android:layout_alignparentleft="true"             android:id="@+id/nav_exit"             android:layout_width="75dp"             android:layout_height="40dp" />      </android.support.percent.percentrelativelayout>  </android.support.v4.widget.drawerlayout>

stack trace

01-07 20:30:16.708  22258-22258/com.godpowerturbo.android e/main﹕ nav menu click! 01-07 20:30:16.708  22258-22258/com.godpowerturbo.android w/dalvikvm﹕ threadid=1: thread exiting uncaught exception (group=0x412c0438) 01-07 20:30:16.738  22258-22258/com.godpowerturbo.android e/androidruntime﹕ fatal exception: main     java.lang.nullpointerexception             @ com.godpowerturbo.android.main$1.onclick(main.java:49)             @ android.view.view.performclick(view.java:4084)             @ android.view.view$performclick.run(view.java:16987)             @ android.os.handler.handlecallback(handler.java:615)             @ android.os.handler.dispatchmessage(handler.java:92)             @ android.os.looper.loop(looper.java:137)             @ android.app.activitythread.main(activitythread.java:4807)             @ java.lang.reflect.method.invokenative(native method)             @ java.lang.reflect.method.invoke(method.java:511)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:792)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:559)             @ dalvik.system.nativestart.main(native method)

now problem when click imagebutton crashes app raises null pointer exception when reaches dw.opendrawer(gravity.left); log before works.

and how access image button in navigation drawer launch different existing activities.

thanks in advance


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