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为什么菜单项在工具栏上如此奇怪地对齐?

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对于较小的工具栏,它的行为更加奇怪:

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我使用以下代码:

MainActivity.java:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    //getMenuInflater().inflate(R.menu.menu_main_right, menu);

    Toolbar toolbar = findViewById(R.id.toolbar);
    ActionMenuView toolbarLeft = toolbar.findViewById(R.id.toolbarLeft);
    getMenuInflater().inflate(R.menu.menu_main_left, toolbarLeft.getMenu());

    return true;
}

活动主.xml:

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".MainActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:theme="@style/ActionBar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <android.support.v7.widget.ActionMenuView
            android:id="@+id/toolbarLeft"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:gravity="center_vertical|start"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

    </android.support.v7.widget.Toolbar>

</android.support.constraint.ConstraintLayout>

样式.xml:

<resources>

    <style name="ActionBar">
        <item name="android:background">@drawable/toolbar</item>
        <item name="actionMenuTextColor">@color/colorToolbarText</item>
    </style>

</resources>

menu_main_left.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu 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"
    tools:context=".MainActivity">

    <item
        android:id="@+id/actionAdd"
        android:title="Add"
        app:showAsAction="always"/>

    <item
        android:id="@+id/actionDetails"
        android:title="Details"
        app:showAsAction="always"/>

    <item
        android:id="@+id/actionLegend"
        android:title="Legend"
        app:showAsAction="always"/>

    <item
        android:id="@+id/actionSettings"
        android:title="Settings"
        app:showAsAction="always"/>

</menu>
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