How to Adjust the width of navigation drawer in android studio -

i downloaded navigation template, , want adjust width of navigation. i've tried different methods think nothing suited. how can solve problem? can't adjust width of navigation drawer.

this code navigationaldrawerfragment.java

package com.example.user.navigationkamo;   import android.app.activity;  import android.app.fragment;  import android.content.sharedpreferences;  import android.content.res.configuration;  import android.content.res.resources;  import android.graphics.bitmap;  import android.graphics.bitmapshader;  import android.graphics.canvas;  import android.graphics.colorfilter;  import android.graphics.paint;  import android.graphics.pixelformat;  import android.graphics.rect;  import android.graphics.rectf;  import android.graphics.shader;  import android.graphics.drawable.drawable;  import android.os.bundle;  import android.preference.preferencemanager;  import android.support.v7.app.actionbardrawertoggle;  import android.support.v4.widget.drawerlayout;  import android.support.v7.widget.linearlayoutmanager;  import android.support.v7.widget.recyclerview;  import android.support.v7.widget.toolbar;  import android.util.typedvalue;  import android.view.layoutinflater;  import android.view.view;  import android.view.viewgroup;  import android.widget.imageview;  import android.widget.textview;   import java.util.arraylist;  import java.util.list;  /** * fragment used managing interactions , presentation of navigation drawer. * see <a href="https://developer.android.com/design/patterns/navigation-drawer.html#interaction"> * design guidelines</a> complete explanation of behaviors implemented here. */ public class navigationdrawerfragment extends fragment implements navigationdrawercallbacks {  /**  * remember position of selected item.  */ private static final string state_selected_position = "selected_navigation_drawer_position";  /**  * per design guidelines, should show drawer on launch until user manually  * expands it. shared preference tracks this.  */ private static final string pref_user_learned_drawer = "navigation_drawer_learned";  /**  * pointer current callbacks instance (the activity).  */ private navigationdrawercallbacks mcallbacks;  /**  * helper component ties action bar navigation drawer.  */ private actionbardrawertoggle mactionbardrawertoggle;  private drawerlayout mdrawerlayout; private recyclerview mdrawerlist; private view mfragmentcontainerview;  private int mcurrentselectedposition = 0; private boolean mfromsavedinstancestate; private boolean muserlearneddrawer;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      // read in flag indicating whether or not user has demonstrated awareness of     // drawer. see pref_user_learned_drawer details.     sharedpreferences sp = preferencemanager.getdefaultsharedpreferences(getactivity());     muserlearneddrawer = sp.getboolean(pref_user_learned_drawer, false);      if (savedinstancestate != null) {         mcurrentselectedposition = savedinstancestate.getint(state_selected_position);         mfromsavedinstancestate = true;     } }  @override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {     view view = inflater.inflate(r.layout.fragment_navigation_drawer, container, false);     mdrawerlist = (recyclerview) view.findviewbyid(r.id.drawerlist);     linearlayoutmanager layoutmanager = new linearlayoutmanager(getactivity());     layoutmanager.setorientation(linearlayoutmanager.vertical);     mdrawerlist.setlayoutmanager(layoutmanager);     mdrawerlist.sethasfixedsize(true);      final list<navigationitem> navigationitems = getmenu();     navigationdraweradapter adapter = new navigationdraweradapter(navigationitems);     adapter.setnavigationdrawercallbacks(this);     mdrawerlist.setadapter(adapter);     selectitem(mcurrentselectedposition);     return view; }  public void setup(int fragmentid, drawerlayout drawerlayout) {     mdrawerlayout = drawerlayout;     mdrawerlayout.setdrawerlockmode(drawerlayout.lock_mode_locked_closed); }    public boolean isdraweropen() {      return mdrawerlayout != null && mdrawerlayout.isdraweropen(mfragmentcontainerview); }  public actionbardrawertoggle getactionbardrawertoggle() {     return mactionbardrawertoggle; }  public drawerlayout getdrawerlayout() {     return mdrawerlayout; }  @override public void onnavigationdraweritemselected(int position) {     selectitem(position); }  public list<navigationitem> getmenu() {     list<navigationitem> items = new arraylist<navigationitem>();     items.add(new navigationitem("driver details", getresources().getdrawable(r.drawable.ic_driver)));     items.add(new navigationitem("track me", getresources().getdrawable(r.drawable.ic_track)));     items.add(new navigationitem("contact", getresources().getdrawable(r.drawable.ic_contact)));     items.add(new navigationitem("report driver", getresources().getdrawable(r.drawable.ic_report)));     items.add(new navigationitem("call emergency", getresources().getdrawable(r.drawable.ic_call)));     items.add(new navigationitem("rate taxi", getresources().getdrawable(r.drawable.ic_rate)));     items.add(new navigationitem("favorites", getresources().getdrawable(r.drawable.ic_favorite)));     items.add(new navigationitem("top drivers", getresources().getdrawable(r.drawable.ic_top)));     items.add(new navigationitem("security tips", getresources().getdrawable(r.drawable.ic_security)));     return items; }  /**  * users of fragment must call method set navigation drawer interactions.  *  * @param fragmentid   android:id of fragment in activity's layout.  * @param drawerlayout drawerlayout containing fragment's ui.  * @param toolbar      toolbar of activity.  */ public void setup(int fragmentid, drawerlayout drawerlayout, toolbar toolbar) {     mfragmentcontainerview = getactivity().findviewbyid(fragmentid);     mdrawerlayout = drawerlayout;      mdrawerlayout.setstatusbarbackgroundcolor(getresources().getcolor(r.color.myprimarydarkcolor));      mactionbardrawertoggle = new actionbardrawertoggle(getactivity(), mdrawerlayout, toolbar, r.string.drawer_open, r.string.drawer_close) {         @override         public void ondrawerclosed(view drawerview) {               super.ondrawerclosed(drawerview);             if (!isadded()) return;              getactivity().invalidateoptionsmenu(); // calls onprepareoptionsmenu()         }          @override         public void ondraweropened(view drawerview) {              super.ondraweropened(drawerview);             if (!isadded()) return;             if (!muserlearneddrawer) {                 muserlearneddrawer = true;                 sharedpreferences sp = preferencemanager                         .getdefaultsharedpreferences(getactivity());                 sp.edit().putboolean(pref_user_learned_drawer, true).apply();             }             getactivity().invalidateoptionsmenu(); // calls onprepareoptionsmenu()         }     };      // if user hasn't 'learned' drawer, open introduce them drawer,     // per navigation drawer design guidelines.     if (!muserlearneddrawer && !mfromsavedinstancestate) {         mdrawerlayout.opendrawer(mfragmentcontainerview);     }      // defer code dependent on restoration of previous instance state.     mdrawerlayout.post(new runnable() {         @override         public void run() {             mactionbardrawertoggle.syncstate();         }     });      mdrawerlayout.setdrawerlistener(mactionbardrawertoggle); }  private void selectitem(int position) {     mcurrentselectedposition = position;     if (mdrawerlayout != null) {         mdrawerlayout.closedrawer(mfragmentcontainerview);     }     if (mcallbacks != null) {         mcallbacks.onnavigationdraweritemselected(position);     }     ((navigationdraweradapter) mdrawerlist.getadapter()).selectposition(position); }  public void opendrawer() {     mdrawerlayout.opendrawer(mfragmentcontainerview); }  public void closedrawer() {     mdrawerlayout.closedrawer(mfragmentcontainerview); }  @override public void onattach(activity activity) {     super.onattach(activity);     try {         mcallbacks = (navigationdrawercallbacks) activity;     } catch (classcastexception e) {         throw new classcastexception("activity must implement navigationdrawercallbacks.");     } }  @override public void ondetach() {     super.ondetach();     mcallbacks = null; }  @override public void onsaveinstancestate(bundle outstate) {     super.onsaveinstancestate(outstate);     outstate.putint(state_selected_position, mcurrentselectedposition); }  @override public void onconfigurationchanged(configuration newconfig) {     super.onconfigurationchanged(newconfig);     // forward new configuration drawer toggle component.     mactionbardrawertoggle.onconfigurationchanged(newconfig); }  public void setuserdata(string user, string email, bitmap avatar) {     imageview avatarcontainer = (imageview) mfragmentcontainerview.findviewbyid(r.id.imgavatar);     ((textview) mfragmentcontainerview.findviewbyid(r.id.txtuseremail)).settext(email);     ((textview) mfragmentcontainerview.findviewbyid(r.id.txtusername)).settext(user);     avatarcontainer.setimagedrawable(new roundimage(avatar)); }  public view getgoogledrawer() {     return mfragmentcontainerview.findviewbyid(r.id.googledrawer); }  public static class roundimage extends drawable {     private final bitmap mbitmap;     private final paint mpaint;     private final rectf mrectf;     private final int mbitmapwidth;     private final int mbitmapheight;      public roundimage(bitmap bitmap) {         mbitmap = bitmap;         mrectf = new rectf();         mpaint = new paint();         mpaint.setantialias(true);         mpaint.setdither(true);         final bitmapshader shader = new bitmapshader(bitmap, shader.tilemode.clamp, shader.tilemode.clamp);         mpaint.setshader(shader);          mbitmapwidth = mbitmap.getwidth();         mbitmapheight = mbitmap.getheight();     }      @override     public void draw(canvas canvas) {         canvas.drawoval(mrectf, mpaint);     }      @override     protected void onboundschange(rect bounds) {         super.onboundschange(bounds);         mrectf.set(bounds);     }      @override     public void setalpha(int alpha) {         if (mpaint.getalpha() != alpha) {             mpaint.setalpha(alpha);             invalidateself();         }     }      @override     public void setcolorfilter(colorfilter cf) {         mpaint.setcolorfilter(cf);     }      @override     public int getopacity() {         return pixelformat.translucent;     }      @override     public int getintrinsicwidth() {         return mbitmapwidth;     }      @override     public int getintrinsicheight() {         return mbitmapheight;     }      public void setantialias(boolean aa) {         mpaint.setantialias(aa);         invalidateself();     }      @override     public void setfilterbitmap(boolean filter) {         mpaint.setfilterbitmap(filter);         invalidateself();     }      @override     public void setdither(boolean dither) {         mpaint.setdither(dither);         invalidateself();     }      public bitmap getbitmap() {         return mbitmap;     }  } } 

take in activity's layout-file firstly assign navigationdrawer. beside few other information should find section looking this

    <fragment     android:id="@+id/navigation_drawer"     android:name="com.example.myapplication.navigationdrawerfragment"     android:layout_width="@dimen/navigation_drawer_width"     android:layout_height="match_parent"     android:layout_gravity="start"     tools:layout="@layout/fragment_navigation_drawer" /> 

the tag android:layout_width defines drawer's width , it's linked dimensions-file. if there (cmd/ctrl + click) can or redefine value:

<resources> <!-- default screen margins, per android design guidelines. --> <dimen name="activity_horizontal_margin">16dp</dimen> <dimen name="activity_vertical_margin">16dp</dimen>  <!-- per design guidelines, navigation drawers should between 240dp , 320dp:      https://developer.android.com/design/patterns/navigation-drawer.html --> <dimen name="navigation_drawer_width">240dp</dimen> 

of course can set width directly in layout-file too.