请注意，您还需要设置

  app:tabPaddingStart="-1dp"
  app:tabPaddingEnd="-1dp"

填满所有空间

解决方案为可滚动:(TabLayout.MODE_SCROLLABLE)，这是当你需要超过2个标签(动态标签)

步骤1:style.xml

<style name="tabCustomStyle" parent="Widget.Design.TabLayout">
            <item name="tabGravity">fill</item>
            <item name="tabMaxWidth">0dp</item>
            <item name="tabIndicatorColor">#FFFEEFC4</item>
            <item name="tabIndicatorHeight">2dp</item>
            <item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
            <item name="tabSelectedTextColor">#FFFEEFC4</item>
        </style>

        <style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
            <item name="android:textSize">@dimen/tab_text_size</item>
            <item name="android:textAppearance">@style/TextAppearance.roboto_medium</item>
            <item name="textAllCaps">true</item>
        </style>
        <style name="TextAppearance.roboto_medium" parent="android:TextAppearance">
            <item name="android:fontFamily">sans-serif-medium</item>
        </style>

步骤2:xml布局

<android.support.design.widget.TabLayout
            android:id="@+id/sliding_tabs"
            style="@style/tabCustomStyle"
            android:layout_width="match_parent"
            android:layout_height="@dimen/tab_strip_height"
            android:background="@color/your_color"
            app:tabMode="scrollable"
            app:tabTextColor="@color/your_color" />

步骤3:在你的活动/片段中，只要你有标签。

/**
     * To allow equal width for each tab, while (TabLayout.MODE_SCROLLABLE)
     */
    private void allotEachTabWithEqualWidth() {

        ViewGroup slidingTabStrip = (ViewGroup) mTabLayout.getChildAt(0);
        for (int i = 0; i < mTabLayout.getTabCount(); i++) {
            View tab = slidingTabStrip.getChildAt(i);
            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) tab.getLayoutParams();
            layoutParams.weight = 1;
            tab.setLayoutParams(layoutParams);
        }

    }

为什么要这么忙? 只要把app:tabMode="scrollable"放在你的XML TabLayout中。 这是它。

检查下面的解决方案代码。

下面是布局代码:

<com.yourpackage.CustomTabLayout
    android:id="@+id/tabs"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="@color/off_white"
    app:tabIndicatorColor="@color/primaryColor"
    app:tabIndicatorHeight="3dp"
    app:tabMode="scrollable"
    app:tabPaddingEnd="0dp"
    app:tabPaddingStart="0dp" />

注意，对于动态标签计数，不要忘记调用setTabNumbers(tabcount)。

import android.content.Context;
import android.support.design.widget.TabLayout;
import android.util.AttributeSet;
import android.util.
import java.lang.reflect.Field;

public class CustomTabLayout extends TabLayout
{
    private static final int WIDTH_INDEX = 0;
    private int DIVIDER_FACTOR = 3;
    private static final String SCROLLABLE_TAB_MIN_WIDTH = "mScrollableTabMinWidth";

    public CustomTabLayout(Context context) {
        super(context);
        initTabMinWidth();
    }

    public CustomTabLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        initTabMinWidth();
    }

    public CustomTabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initTabMinWidth();
    }

    public void setTabNumbers(int num)
    {
        this.DIVIDER_FACTOR = num;
        initTabMinWidth();
    }

    private void initTabMinWidth()
    {
        int[] wh = getScreenSize(getContext());
        int tabMinWidth = wh[WIDTH_INDEX] / DIVIDER_FACTOR;

        Log.v("CUSTOM TAB LAYOUT", "SCREEN WIDTH = " + wh[WIDTH_INDEX] + " && tabTotalWidth = " + (tabMinWidth*DIVIDER_FACTOR) + " && TotalTabs = " + DIVIDER_FACTOR);

        Field field;
        try {
            field = TabLayout.class.getDeclaredField(SCROLLABLE_TAB_MIN_WIDTH);
            field.setAccessible(true);
            field.set(this, tabMinWidth);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static final int WIDTH_INDEX = 0;
    private static final int HEIGHT_INDEX = 1;

    public static int[] getScreenSize(Context context) {
        int[] widthHeight = new int[2];
        widthHeight[WIDTH_INDEX] = 0;
        widthHeight[HEIGHT_INDEX] = 0;

        try {
            WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
            Display display = windowManager.getDefaultDisplay();

            Point size = new Point();
            display.getSize(size);
            widthHeight[WIDTH_INDEX] = size.x;
            widthHeight[HEIGHT_INDEX] = size.y;

            if (!isScreenSizeRetrieved(widthHeight))
            {
                DisplayMetrics metrics = new DisplayMetrics();
                display.getMetrics(metrics);
                widthHeight[0] = metrics.widthPixels;
                widthHeight[1] = metrics.heightPixels;
            }

            // Last defense. Use deprecated API that was introduced in lower than API 13
            if (!isScreenSizeRetrieved(widthHeight)) {
                widthHeight[0] = display.getWidth(); // deprecated
                widthHeight[1] = display.getHeight(); // deprecated
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return widthHeight;
    }

    private static boolean isScreenSizeRetrieved(int[] widthHeight) {
        return widthHeight[WIDTH_INDEX] != 0 && widthHeight[HEIGHT_INDEX] != 0;
    }
}

参考来自https://medium.com/@elsenovraditya/set-tab-minimum-width-of- scrolable -tablayout- programmcally-8146d6101efe

<android.support.design.widget.TabLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMaxWidth="0dp"
            app:tabGravity="fill"
            app:tabMode="fixed" />

为我工作。这里还有xmlns:app="http://schemas.android.com/apk/res-auto"

在我的这个问题的变体中，我有3个中等大小的标签，它们没有占据平板电脑的全部宽度。我不需要在平板电脑上滚动标签，因为平板电脑足够大，可以在不滚动的情况下显示所有标签。但我确实需要这些标签可以在手机上滚动，因为手机太小了，无法同时显示所有的标签。

在我的案例中，最好的解决方案是添加一个res/layout-sw600dp/main_activity.xml文件，其中相关的TabLayout可以有app:tabGravity="fill"和app:tabMode="fixed"。但在我的常规res/layout/main_activity.xml中，我省略了app:tabGravity="fill"和app:tabMode="fixed"，而使用app:tabMode="scrollable"。