android - Navigation Drawer RTL lang -

i'm using navigation drawer in 1 of app activity it's open left right how can change right left , icon direction try layout_gravity:right; force closed happened during running app did not answer other question app minimum sdk set 15

here activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     tools:opendrawer="start"      >      >      <include         layout="@layout/app_bar_main"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.design.widget.navigationview         android:id="@+id/nav_view"         android:layout_width="wrap_content"         android:layout_height="match_parent"         android:layout_gravity="start"         android:fitssystemwindows="true"         app:headerlayout="@layout/nav_header_main"         app:menu="@menu/activity_main_drawer" />  </android.support.v4.widget.drawerlayout> 

and main activity

package ir.diamonddesign.tajrobi96;  import android.content.intent; import android.net.uri; import android.os.bundle; import android.support.design.widget.floatingactionbutton; import android.support.design.widget.snackbar; import android.util.log; import android.view.gravity; import android.view.view; import android.support.design.widget.navigationview; import android.support.v4.view.gravitycompat; import android.support.v4.widget.drawerlayout; import android.support.v7.app.actionbardrawertoggle; import android.support.v7.app.appcompatactivity; import android.support.v7.widget.toolbar; import android.view.menu; import android.view.menuitem; import android.webkit.webview; import android.webkit.webviewclient; import android.widget.toast;  public class mainactivity extends appcompatactivity         implements navigationview.onnavigationitemselectedlistener {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);         setsupportactionbar(toolbar);           drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);         actionbardrawertoggle toggle = new actionbardrawertoggle(                 this, drawer, toolbar, r.string.navigation_drawer_open, r.string.navigation_drawer_close);         drawer.setdrawerlistener(toggle);         toggle.syncstate();          navigationview navigationview = (navigationview) findviewbyid(r.id.nav_view);         navigationview.setnavigationitemselectedlistener(this);         navigationview.setitemicontintlist(null);       }       @override     public void onbackpressed() {         drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);         if (drawer.isdraweropen(gravitycompat.start)) {             drawer.closedrawer(gravitycompat.start);         } else {             super.onbackpressed();         }     }       @suppresswarnings("statementwithemptybody")     @override     public boolean onnavigationitemselected(menuitem item) {         // handle navigation view item clicks here.         int id = item.getitemid();          if (id == r.id.homeitem) {             intent mintent = new intent(this, mainactivity.class);             startactivity(mintent);          } else if (id == r.id.questionitem) {             intent mintent = new intent(this, questionsactivity.class);             startactivity(mintent);         } else if (id == r.id.answeritem) {          } else if (id == r.id.eduitem) {          } else if (id == r.id.sourceitem) {          } else if (id == r.id.changeitem) {          } else if (id == r.id.videositem) {          } else if (id == r.id.newsitem) {          } else if (id == r.id.shareitem) {              intent sharingintent = new intent(android.content.intent.action_send);             sharingintent.settype("text/plain");             string sharebody = "اینو ببین : https://cafebazaar.ir/app/ir.tik.tik/?l=fa";             sharingintent.putextra(android.content.intent.extra_subject, "موضوع پیام");             sharingintent.putextra(android.content.intent.extra_text, sharebody);             startactivity(intent.createchooser(sharingintent, "از طریق"));          } else if (id == r.id.contactitem) {                string[] = {"tajrobi@tinytree.ml"};              intent emailintent = new intent(android.content.intent.action_sendto,uri.fromparts("mailto", "", null));             emailintent.putextra(intent.extra_email, to);             emailintent.putextra(intent.extra_subject, "موضوع پیام");             emailintent.putextra(intent.extra_text,"سلام از اپیکیشن کنکور تماس میگیرم....");             startactivity(emailintent);             }            else if (id == r.id.exititem) { finish();         }         drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);         drawer.closedrawer(gravitycompat.start);         return true;     } } 

it automatically changed rtl when change locale of application.