android - ClientCursorAdapter.getFilter()' on a null object reference -

i'm using cursoradapter , listview display list of songs , filter in searchview problem when tap searchview icon i've got error , pointing error code

adapter.getfilter().filter(newtext); 

here code

under oncreateoptionsmenu()

 searchview searchview = (searchview) item.getactionview();  searchview.setqueryhint("search title/artist");  searchview.setonquerytextlistener(new searchview.onquerytextlistener() {      @override     public boolean onquerytextsubmit(string query) {         return false;     }      @override     public boolean onquerytextchange(string newtext) {          adapter.getfilter().filter(newtext);         return false;     } }); 

calling cursoradapter

  cursor res = db.query("songs",null,null,null,null,null,"title");           clientcursoradapter adapter = new clientcursoradapter(mainactivity.this,res, cursoradapter.flag_register_content_observer); //// ////         lv.setadapter(adapter); 

row_layout.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:layout_width="match_parent" android:layout_height="80dp"     android:background="@color/black">       <textview         android:id="@+id/title"         android:layout_width="wrap_content"         android:layout_height="37.5dp"         android:text="title"         android:paddingleft="10dp"         android:textsize="22dp"         android:gravity="center_vertical"         android:textcolor="#ffffff"         android:layout_alignparentleft="true" />      <togglebutton         android:id="@+id/minus_one"         android:layout_width="20dp"         android:layout_height="20dp"         android:layout_alignparentright="true"         android:checked="true"         android:focusable="false"         android:focusableintouchmode="false"         android:texton=""         android:textcolor="@color/coloraccent"         android:layout_marginright="5dp"         android:background="@drawable/minus_one"         android:textoff=""         />     <togglebutton         android:id="@+id/favorite"         android:layout_width="20dp"         android:layout_height="20dp"         android:layout_alignparentright="true"         android:layout_below="@+id/minus_one"         android:layout_margintop="@dimen/activity_horizontal_margin"         android:checked="true"         android:texton=""         android:focusable="false"         android:focusableintouchmode="false"         android:layout_marginright="5dp"        android:background="@drawable/favorite"         android:textoff=""         />       <textview         android:id="@+id/artist"         android:layout_width="wrap_content"         android:layout_height="37.5dp"         android:text="artist"         android:paddingleft="10dp"         android:textcolor="#707070"         android:layout_below="@+id/title"         />     <view         android:layout_width="match_parent"         android:layout_height="2dp"         android:background="#4f5051"         android:layout_below="@+id/artist"         >      </view>    </relativelayout> 

clientcursoradapter.java

class clientcursoradapter extends cursoradapter {     context context;     public clientcursoradapter(context context, cursor c, int flags) {         super(context, c, flags);         this.context = context;     }      @override     public view newview(context context, cursor cursor, viewgroup viewgroup) {         layoutinflater inflater = (layoutinflater)context.getsystemservice(context.layout_inflater_service);         view v = inflater.inflate(r.layout.row_layout,viewgroup,false);         return v;     }      @override     public void bindview(view view, context context, cursor cursor) {          textview title = view.findviewbyid(r.id.title);         textview artist = view.findviewbyid(r.id.artist);         togglebutton music = view.findviewbyid(r.id.minus_one);         togglebutton favorite = view.findviewbyid(r.id.favorite);          title.settext(cursor.getstring(cursor.getcolumnindex("title")));         artist.settext(cursor.getstring(cursor.getcolumnindex("artist")));      } } 

then i've got error

process: com.example.mcgyver.sdalyrics, pid: 5851

java.lang.nullpointerexception: attempt invoke virtual method 'android.widget.filter com.example.mcgyver.sdalyrics.clientcursoradapter.getfilter()' on null object reference @ com.example.mcgyver.sdalyrics.mainactivity$2.onquerytextchange(mainactivity.java:125) @ android.support.v7.widget.searchview.ontextchanged(searchview.java:1232) @ android.support.v7.widget.searchview$12.ontextchanged(searchview.java:1762)

the clientcursoradapter has not yet created when oncreateoptionsmenu. use following code,

if(adapter!=null){    adapter.getfilter().filter(newtext); }