Today i have stucked in one of the weird problem in Toolbar custom header.
I am using the TextView in the center and ImageView which is at the right of the Toolbar. So i have used below lines of code in xml , please check it once.
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:theme="@style/AppTheme.NoActionBar.AppBarOverlay">
<LinearLayout 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="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#3EC3D6"
app:layout_collapseMode="pin"
app:popupTheme="@style/AppTheme.NoActionBar.PopupOverlay">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal">
<TextView
android:id="@+id/headerTxt"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:gravity="center"
android:layout_gravity="center"
android:maxLines="1"
android:text="Tile"
android:textColor="@android:color/black" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/chat_new_icon"
android:layout_gravity="right"
/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
And getting these output from above code.

I have used the RelativeLayout for it to come out from this problem, But it also NOT worked.Please check the below code for it
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#3EC3D6"
app:layout_collapseMode="pin"
app:popupTheme="@style/AppTheme.NoActionBar.PopupOverlay">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/headerTxt"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:gravity="center"
android:layout_gravity="center"
android:layout_centerInParent="true"
android:maxLines="1"
android:text="Tile"
android:textColor="@android:color/black" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/chat_new_icon"
android:layout_alignParentRight="true"
android:layout_gravity="right"
/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
And getting another unexpected result please check it once.

I have already refer this solution but it is not working for me.Please check the link once.
1. First Link
2. Second Link
3. Third Link
4. Forth Link
What i need that TextView should at the center of the Toolbar and ImageView should at the right of the Toolbar.Please help me to short out from this problem.
Just update your code...edited your relative layout implementation
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/headerTxt"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:layout_centerInParent="true"
android:maxLines="1"
android:text="Tile"
android:textColor="@android:color/black" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/chat_new_icon"
android:layout_toRightOf="@+id/headerTxt"
android:layout_centerVertical="true"
/>
</RelativeLayout>
This is working ...
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:local="http://schemas.android.com/tools"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#3EC3D6"
app:layout_collapseMode="pin"
local:popupTheme="@style/ThemeOverlay.AppCompat.Light">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/headerTxt"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:ellipsize="marquee"
android:maxLines="1"
android:text="Tile"
android:textColor="@android:color/black" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/headerTxt"
android:src="@drawable/delete_icon" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
This is what comes at my end
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:local="http://schemas.android.com/tools"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#3EC3D6"
app:layout_collapseMode="pin"
local:popupTheme="@style/ThemeOverlay.AppCompat.Light">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/headerTxt"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:ellipsize="marquee"
android:maxLines="1"
android:text="Tile"
android:textColor="@android:color/black" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/headerTxt"
android:src="@drawable/delete_icon" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
@MikeM. suggestion has worked for me. For more detail on the issue please refer this link click here
What i have done to get rid off from the problem is that I have removed the LinearLayout inside the Toolbar and set the gravity of the view with help of android:layout_gravity, Please refer the below solution for it
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#3EC3D6"
app:layout_collapseMode="pin"
app:popupTheme="@style/AppTheme.NoActionBar.PopupOverlay">
<TextView
android:id="@+id/headerTxt"
style="@style/Base.TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:ellipsize="marquee"
android:maxLines="1"
android:text="Tile"
android:textColor="@android:color/black" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginRight="10dp"
android:src="@drawable/chat_new_icon" />
</android.support.v7.widget.Toolbar>
And getting the expected result from above code, please check it once.

来源:https://stackoverflow.com/questions/45615301/toolbar-headers-item-alignment-issue
