为什么标题不在工具栏中居中？

Question

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>

Answer 1

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" />

Answer 2

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"

Answer 3

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