Develop Reference

blank space left even after setting match_parent

i have created an Toolbar with navigation drawer and menu, now i'm trying to add a textView and edittext on the same toolbar and place them in the center, but the problem is when i add relative layout and set width as match parent, it leases some space on the left side and the items which are to be placed in the center are shifted right.
i've pasted the code below:-
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="130dp"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/colorPrimary">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="H E A D"
android:textSize="30dp"
android:layout_centerHorizontal="true"
android:textStyle="bold"
android:id="#+id/ToolbarTextView"
style="#style/Base.TextAppearance.AppCompat.Large"
android:layout_marginTop="9dp"
android:textColor="#color/colorwhite"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/ToolbarTextView"
android:layout_centerHorizontal="true"
android:text="Tagline"
android:textSize="15dp"
android:textColor="#color/colorwhite"/>
<EditText
android:layout_width="292dp"
android:layout_height="wrap_content"
android:background="#drawable/main_search"
android:padding="7dp"
android:backgroundTint="#color/colorwhite"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:hint="Search..."
android:id="#+id/ToolbarSearch1"/>
</RelativeLayout>
</android.support.v7.widget.Toolbar></android.support.design.widget.AppBarLayout><include layout="#layout/content_main" /><android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email" />
the xml code of the mainActivity:-
<android.support.constraint.ConstraintLayout
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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.strease.user.strease.MainActivity"
android:id="#+id/layout4"
tools:showIn="#layout/app_bar_main">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:paddingTop="5dp"
android:layout_width="match_parent"
android:layout_height="match_parent"/></android.support.constraint.ConstraintLayout>
the reference image is given below:-
Screenshot of the device is given below:-
P.S:- i need to omit the blank space and get the editText and textViews to the center of the layout(currently the are shifted towards right)
Navigation Drawer code in main Activity:-
<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>

android:fitsSystemWindows="false"

app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp"
Try to add above four line in your toolbar. It will resolve your problem. And make your child layout inside width match_parent and height wrap_content. And set your sub child view alignment center to horizontally. It will resolve your problem.
If still not resolve your problem then update your XML file for your layout exactly with the included layout so we can find out what exactly problem going on with your layout.

You need to add this properties to Toolbar to remove that space.
android:contentInsetEnd="0dp"
android:contentInsetLeft="0dp"
android:contentInsetRight="0dp"
android:contentInsetStart="0dp"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp"
Like as below.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentInsetEnd="0dp"
android:contentInsetLeft="0dp"
android:contentInsetRight="0dp"
android:contentInsetStart="0dp"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp"
android:background="?attr/colorPrimary">
This will remove the default left space from Toolbar.
Here is screen shot. It seems Edit Text showing in exact center of Toolbar. Also update your minSdkVersion to 21 surely it will work.
Here is the layout code.
<android.support.design.widget.AppBarLayout 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="130dp"
android:background="#android:color/holo_red_light"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/colorAccent"
android:contentInsetEnd="0dp"
android:contentInsetLeft="0dp"
android:contentInsetRight="0dp"
android:contentInsetStart="0dp"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/ToolbarTextView"
style="#style/Base.TextAppearance.AppCompat.Large"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="9dp"
android:text="H E A D"
android:textColor="#android:color/white"
android:textSize="30dp"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/ToolbarTextView"
android:layout_centerHorizontal="true"
android:text="Tagline"
android:textColor="#android:color/white"
android:textSize="15dp" />
<EditText
android:id="#+id/ToolbarSearch1"
android:layout_width="292dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="10dp"
android:background="#android:color/white"
android:backgroundTint="#android:color/white"
android:hint="Search..."
android:padding="7dp" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
<include layout="#layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email" />
</android.support.design.widget.AppBarLayout>
EDIT
Add another property to toolbar for Navigation Icon.
app:contentInsetStartWithNavigation="0dp"
Now your toolbar should be as below.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/colorAccent"
android:contentInsetEnd="0dp"
android:contentInsetLeft="0dp"
android:contentInsetRight="0dp"
android:contentInsetStart="0dp"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStartWithNavigation="0dp"
app:contentInsetStart="0dp">
EDIT 2
I have made some changes to your layout used Linear Layout instead of Relative Layout.
<android.support.design.widget.AppBarLayout 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="130dp"
android:background="#android:color/holo_red_light"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/colorAccent"
android:contentInsetEnd="0dp"
android:contentInsetLeft="0dp"
android:contentInsetRight="0dp"
android:contentInsetStart="0dp"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStartWithNavigation="0dp"
app:contentInsetStart="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="#+id/ToolbarTextView"
style="#style/Base.TextAppearance.AppCompat.Large"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:text="H E A D"
android:textColor="#android:color/white"
android:textSize="30dp"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tagline"
android:layout_marginTop="2dp"
android:textColor="#android:color/white"
android:textSize="15dp" />
<EditText
android:id="#+id/ToolbarSearch1"
android:layout_width="292dp"
android:layout_height="wrap_content"
android:background="#android:color/white"
android:layout_marginTop="3dp"
android:backgroundTint="#android:color/white"
android:hint="Search..."
android:padding="7dp" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
<include layout="#layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email" />
</android.support.design.widget.AppBarLayout>

Unable to center the text in Toolbar title

Here is the image :
I have used a textview inside the toolbar and tried to center the textview using gravity="center". I want to center the textview without using margin shifts or padding shifts or translationX.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
app:title="Train App"
app:collapseIcon="#mipmap/ic_launcher"
app:titleTextColor="#color/primaryTextColor"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
android:layout_width="match_parent"
android:contentInsetLeft="0dp"
android:contentInsetStart="0dp"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
android:contentInsetRight="0dp"
android:contentInsetEnd="0dp"
app:contentInsetRight="0dp"
app:contentInsetEnd="0dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/appTitle"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Train App"
android:gravity="center"
android:textSize="20sp"
android:textColor="#color/primaryTextColor"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_mood_white_24dp"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:layout_marginRight="10dp"/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>

You can try to do something like this:
<FrameLayout
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:theme="#style/AppTheme.AppBarOverlay"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"
android:drawablePadding="#dimen/bounds_m"
android:fontFamily="#font/quicksand"
android:gravity="center"
android:text="#string/appname"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/white"/>
</FrameLayout>
And about ic_mood_white_24dp just go with option menu instead of putting it in toolbar.

Try this..
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/holo_blue_light"
android:contentInsetEnd="0dp"
android:contentInsetLeft="0dp"
android:contentInsetRight="0dp"
android:contentInsetStart="0dp"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/appTitle"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:text="Train App"
android:textColor="#android:color/background_dark"
android:textSize="20sp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:layout_marginRight="10dp"
/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>

You have to add android:layout_centerHorizontal="true" property in your TextView.
Like :
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/appTitle"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:layout_centerHorizontal="true"
android:text="Train App"
android:textColor="#color/colorPrimary"
android:textSize="20sp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:layout_marginRight="10dp"
android:src="#mipmap/ic_launcher" />
</RelativeLayout>

Custom Toolbar layout with edit text

I created a custom layout for toolbar with edittext but it does not fit in toolbar.
I needed toolbar like this
But got this output
I needed full width edittext. Help me to achive this
My XML Code
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:gravity="center"
app:contentInsetStart="0dp"
app:layout_scrollFlags="scroll|enterAlways"
app:navigationIcon="#drawable/icon_toolbar_back"
app:popupTheme="#style/ThemeOverlay.AppCompat.Dark"
app:theme="#style/ThemeOverlay.AppCompat.Dark"
app:titleTextAppearance="#style/ToolbarTextAppearance">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/imgActionLogo"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_gravity="center"
android:src="#drawable/common_google_signin_btn_icon_dark" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="#dimen/_25sdp"
android:layout_marginBottom="#dimen/_5sdp"
android:layout_marginLeft="#dimen/_10sdp"
android:layout_marginRight="#dimen/_10sdp"
android:background="#drawable/toolbar_search_bg"
android:gravity="center"
android:orientation="horizontal"
android:paddingLeft="#dimen/_5sdp"
android:paddingRight="#dimen/_5sdp"
app:layout_scrollFlags="scroll|enterAlways">
<ImageView
android:layout_width="#dimen/_20sdp"
android:layout_height="#dimen/_20sdp"
android:src="#drawable/icon_search" />
<EditText
android:id="#+id/etSearch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="#dimen/_5sdp"
android:background="#null"
android:editable="false"
android:hint="Search More Products..."
android:textColorHint="#color/text_medium"
android:textSize="#dimen/_10sdp" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.Toolbar>
I also searched on google but not able to achieve this.

The inner content of the Toolbar will shrink if you use app:navigationIcon and/or menu items.
You can omit app:navigationIcon and menu items and create your own buttons inside Toolbar.
Then setting
<android.support.v7.widget.Toolbar
...
app:contentInsetRight="0dp"
app:contentInsetLeft="0dp">
...
</android.support.v7.widget.Toolbar>
should give you more control of content padding

When you are using toolbar it will add some margin space after menu icon. So you have to add search view below of toolbar with same background color parent and make it fixed if there are any scroll then add that scroll below of search layout. Try this.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="#dimen/_25sdp"
android:background="?attr/colorPrimary"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:gravity="center"
app:contentInsetStart="0dp"
app:layout_scrollFlags="scroll|enterAlways"
app:navigationIcon="#drawable/icon_toolbar_back"
app:popupTheme="#style/ThemeOverlay.AppCompat.Dark"
app:theme="#style/ThemeOverlay.AppCompat.Dark"
app:titleTextAppearance="#style/ToolbarTextAppearance">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/imgActionLogo"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_gravity="center"
android:src="#drawable/common_google_signin_btn_icon_dark"/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="#dimen/_25sdp"
android:background="?attr/colorPrimary">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="#dimen/_25sdp"
android:layout_marginBottom="#dimen/_5sdp"
android:layout_marginLeft="#dimen/_10sdp"
android:layout_marginRight="#dimen/_10sdp"
android:background="#drawable/toolbar_search_bg"
android:gravity="center"
android:orientation="horizontal"
android:paddingLeft="#dimen/_5sdp"
android:paddingRight="#dimen/_5sdp"
app:layout_scrollFlags="scroll|enterAlways">
<ImageView
android:layout_width="#dimen/_20sdp"
android:layout_height="#dimen/_20sdp"
android:src="#drawable/icon_search" />
<EditText
android:id="#+id/etSearch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="#dimen/_5sdp"
android:background="#null"
android:editable="false"
android:hint="Search More Products..."
android:textColorHint="#color/text_medium"
android:textSize="#dimen/_10sdp" />
</LinearLayout>
</FrameLayout>
</LinearLayout>

Why title is not centered in toolbar?

I am trying to add customized toolbar i want cart badge count so i added the relative layout to toolbar widget, when i didn't added relative layout in toolbar the title appeared in center but now removing relative layout causes problem in adding badge textview on cart, can anybody suggest what to do in this situation?
Toolbar.xml
<android.support.v7.widget.Toolbar
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/mytoolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentInsetStart="0dp"
app:contentInsetRight="0dp"
app:contentInsetLeft="0dp"
android:clipToPadding="false"
app:contentInsetStartWithNavigation="0dp"
app:contentInsetEndWithActions="0dp"
android:background="#color/header">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/displaytexttoolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:layout_margin="#dimen/activity_vertical_margin"
android:text="TEXT_VIEW"
android:textColor="#color/white" />
<RelativeLayout
android:layout_gravity="right"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/cart_imagetoolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_gravity="end"
android:layout_margin="#dimen/activity_vertical_margin"
android:src="#drawable/cart_mobile_white" />
<TextView
android:id="#+id/tvBadge"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_gravity="right"
android:background="#drawable/cart_circle_mobile"
android:gravity="center"
android:textColor="#color/white"
android:visibility="visible" />
</RelativeLayout>
</RelativeLayout>

It has to do with your layout_margin. Try the below:
<TextView
android:id="#+id/displaytexttoolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft|Right="?attr/actionBarSize"
android:text="TEXT_VIEW"
android:textColor="#color/white" />

Default value of the contentInsetStart (left padding in toolbar) is 16dp.
Change it to
android:contentInsetStart="0dp"
android:contentInsetLeft="0dp"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"

Try this code:
use a Framelayout instead of RelativeLayout and apply android:gravity="center" for the Title
<android.support.v7.widget.Toolbar 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/mytoolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:contentInsetLeft="0dp"
android:contentInsetStart="0dp"
android:theme="#style/ThemeToolbar"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/displaytexttoolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="#dimen/activity_vertical_margin"
android:gravity="center"
android:text="TEXT_VIEW"
android:textColor="#color/color_black" />
<ImageView
android:id="#+id/cart_imagetoolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_gravity="end"
android:layout_margin="#dimen/activity_vertical_margin"
android:src="#mipmap/ic_launcher" />
<ImageView
android:id="#+id/tvBadge"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_gravity="right"
android:gravity="center"
android:src="#mipmap/ic_launcher"
android:textColor="#color/color_black"
android:visibility="visible" />
</FrameLayout>
</android.support.v7.widget.Toolbar>
Output

Unexplained gap/padding to the left, between Toolbar, and LinearLayout

I have the following structure in the layout file of my Android studio project, and I see unexplained left padding between the parent element (Toolbar) and it's immediate child element (LinearLayout).
Layout Text
<Toolbar
android:layout_width="fill_parent"
android:layout_height="600dp"
android:id="#+id/toolbar"
android:background="#313B45"
android:weightSum="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent" android:orientation="vertical">
<ImageView
android:id="#+id/headerimage"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitXY"
android:layout_gravity="left|top"
android:layout_weight="1"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="New Text"
android:id="#+id/textView"
android:scaleType="fitXY"
android:layout_gravity="left|top"
android:layout_weight="1"/>
</LinearLayout>
</Toolbar>
How can I remove this gap and have the child LinearLayout align fully with the parent Toolbar?

Add these lines to your toolbar layout :
For API<=21 toolbar :
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
For API 21>= toolbar :
android:contentInsetLeft="0dp"
android:contentInsetStart="0dp"
The left inset is caused by Toolbar's contentInsetStart which by default is 16dp.
Here's the full code :
<android.support.v7.widget.Toolbar
android:layout_width="fill_parent"
android:layout_height="600dp"
android:id="#+id/toolbar"
android:background="#313B45"
android:weightSum="1"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/headerimage"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitXY"
android:layout_gravity="left|top"
android:layout_weight="1" />
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="New Text"
android:id="#+id/textView"
android:scaleType="fitXY"
android:layout_gravity="left|top"
android:layout_weight="1" />
</LinearLayout>

The above answer helped solve only a part, add these lines and it should work fine
android.support.v7.widget.Toolbar
xmlns:app="schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/primaryColor"
android:contentInsetLeft="0dp"
android:contentInsetStart="0dp"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
android:contentInsetRight="0dp"
android:contentInsetEnd="0dp"
app:contentInsetRight="0dp"
app:contentInsetEnd="0dp" />
notice that android:contentInsetLeft and app:contentInsetLeft are 2 separate things and both of them are needed