TabLayout不会扩展整个屏幕宽度

Question

我想填充我的TabLayout左右两侧的空间，以便它填满整个屏幕。但是我无法让它发挥作用。这是我的Layout.xml。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="cytek2806northman.tabtestproject.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_height = "wrap_content"
        android:layout_width = "match_parent"
        >

        <android.support.design.widget.TabLayout
            android:layout_height = "wrap_content"
            android:layout_width = "match_parent"
            android:id="@+id/tabLayout"
            app:tabMode="scrollable"
            app:tabGravity="fill"
            >
        </android.support.design.widget.TabLayout>


    </android.support.design.widget.AppBarLayout>

        <android.support.v4.view.ViewPager
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/viewPager">
        </android.support.v4.view.ViewPager>


</RelativeLayout>

Answer 1

由于我无法确定相对布局中边距的值是什么，因此它必须是导致空白空间的属性。删除它们，它应该工作，因为其他任何看起来正确。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="cytek2806northman.tabtestproject.MainActivity">

Answer 2

解决方案正在删除

android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"