java - Menu Icon and Title Icon display not working -

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i want set menu icon(about app) rhs of title , icon(like button) lhs of title. android:icon doesn't seem work on manifest activity xml.

     button:         1)without using toolbar         getsupportactionbar().setdisplayhomeasupenabled(true);         2)with toolbar        toolbar toolbar= (toolbar) findviewbyid(r.id.toolbar_gas_station);        setsupportactionbar(toolbar);        getsupportactionbar().setdisplayhomeasupenabled(true);        icon:         1)without using toolbar          have make menu file , override onoptionsitemselected , oncreateoptionsmenu write code accordingly         2)with toolbar:          <android.support.design.widget.appbarlayout             android:id="@+id/app_bar_layout"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:theme="@style/themeoverlay.appcompat.dark.actionbar"             android:fitssystemwindows="true">    <android.support.v7.widget.toolbar       android:id="@+id/toolbar_gas_station"        android:layout_width="match_parent"        android:layout_height="?attr/actionbarsize"        app:popuptheme="@style/themeoverlay.appcompat.light"  >     <linearlayout         android:id="@id/ll_header_find_parking_map"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:background="@color/colorprimary"         android:gravity="right"         android:padding="@dimen/fifteen">         <imageview             android:id="@+id/iv_search_find_parking_map"             android:layout_width="wrap_content"             android:layout_height="match_parent"             android:src="@drawable/search"/>     </linearlayout> </android.support.v7.widget.toolbar> </android.support.design.widget.appbarlayout>    can handle click event in normal imageview.

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