android - Navigation drawer fragments overlap even with replace() -

i have navigation drawer in activity. activity's layout has relative layout fragment. id of relativelayout maincontent in load fragment(call fraga) in oncreate() of activity. have same fragment in navigation drawer along other navigation items. loaded oncreate of activity , can loaded navigation drawer.

on selecting navigation items, replace fragment in maincontent relativelayout in activity replace(). in navigation drawer, 0th item "fragb"(the same fraga in nav drawer). second fragment(fragc). when select fragb "more once" , select fraga , press button, fragb , fragc overlap.

and have keep pressing button go initial screen because every time select item nav drawer, new fragments fragbs , fragcs created. not replaced. replace them in maincontent(first relative layout) in activity's layout. i'm using framelayout fragments.

this activity's layout in place fragments:

<android.support.v4.widget.drawerlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawerlayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.prematixsofs.taxiapp.datevehiclepicker"> <!-- main content view -->  <relativelayout     android:id="@+id/maincontent"     android:layout_width="match_parent"     android:layout_height="match_parent">      <include         layout="@layout/footer"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_centerhorizontal="true"         android:layout_gravity="center_horizontal|bottom"></include> </relativelayout>  <!-- navigation drawer --> <relativelayout     android:id="@+id/drawerpane"     android:layout_width="230dp"     android:layout_height="match_parent"      android:layout_gravity="start">      <!-- profile box -->      <relativelayout         android:id="@+id/profilebox"         android:layout_width="match_parent"         android:layout_height="80dp"         android:background="#ff02c7c4"         android:padding="8dp">          <imageview             android:id="@+id/avatar"             android:layout_width="50dp"             android:layout_height="50dp"             android:layout_margintop="15dp"             android:src="@drawable/user" />          <linearlayout             android:layout_width="wrap_content"             android:layout_height="42dp"             android:layout_centervertical="true"             android:layout_marginleft="15dp"             android:layout_torightof="@+id/avatar"             android:orientation="vertical">              <textview                 android:id="@+id/username"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:clickable="true"                 android:textcolor="#fff"                 android:textsize="16sp"                 android:textstyle="bold" />              <textview                 android:id="@+id/viewprofile"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_gravity="bottom"                 android:layout_margintop="4dp"                 android:text="view profile"                 android:textcolor="#fff"                 android:textsize="12sp" />         </linearlayout>     </relativelayout>      <!-- list of actions (pages) -->     <listview         android:id="@+id/navlist"         android:layout_width="280dp"         android:layout_height="match_parent"         android:layout_below="@+id/profilebox"         android:background="#ffffffff"         android:choicemode="singlechoice" />      <textview         android:id="@+id/invisibletextviewid"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:visibility="gone" /> </relativelayout> 

this activity's code load fraga:

 android.support.v4.app.fragmentmanager fragmentmanager = getsupportfragmentmanager();     fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();     fragmenttransaction.add(r.id.maincontent, new datetimepicker(),"tags").commit(); 

this nav drawer onselect:

  private void selectitemfromdrawer(int position) {     fragment fragment = null;      switch (position){         case 0: fragment = new datetimepicker();             break;         case 1: fragment = new preferencesfragment();             break;         case 2:             mdrawerlayout.closedrawer(mdrawerpane);             alertdialog.builder alertdialog = new alertdialog.builder(datevehiclepicker.this);              alertdialog.settitle("logout");              // setting dialog message             alertdialog.setmessage("do want logout?");             alertdialog.setpositivebutton("yes", new dialoginterface.onclicklistener() {                 public void onclick(dialoginterface dialog, int which) {                     sessionmanager.logoutuser();                 }             });              alertdialog.setnegativebutton("no", new dialoginterface.onclicklistener() {                 public void onclick(dialoginterface dialog, int which) {                     intent intent = new intent(getapplicationcontext(), mainactivity.class);                     intent.setflags(intent.flag_activity_clear_top);                     intent.putextra("exit", true);                     startactivity(intent);                     dialog.cancel();                 }             });              alertdialog.show();     }     if(fragment!=null)     {         fragmentmanager fragmentmanager = getsupportfragmentmanager();         fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();         fragmenttransaction.addtobackstack(null).replace(r.id.maincontent, fragment);         fragmenttransaction.commit();         mdrawerlayout.closedrawer(mdrawerpane);     } 

this set listener nav drawer:

 mdrawerlist.setonitemclicklistener(new adapterview.onitemclicklistener() {         @override         public void onitemclick(adapterview<?> parent, view view, int position, long id) {             selectitemfromdrawer(position);          }     }); 

i call method selectitemfromdrawer(position);

you must handle backstack must clear fragment on stack when added or replace main fragment

 @override     public void onbackpressed() {         logg.e(tag, getfragmentmanager().getbackstackentrycount());         try {             if (mnavigationdrawerfragment.isdraweropen())             {                 mnavigationdrawerfragment.closedrawer();             }              if (getfragmentmanager().getbackstackentrycount() > 1) {                 getfragmentmanager().popbackstack();             } else             {   exit();          } catch (exception e) {             e.printstacktrace();         }     }