就这么做了，效果很好

<com.google.android.material.tabs.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabGravity="fill"
    app:tabMaxWidth="0dp"/>

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

对我来说，下面的代码可以工作并且足够了。

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

从Kaizie那里借用的一个“更简单”的答案只是在你的TabLayout xml中添加app:tabMaxWidth="0dp":

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

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

要强制制表符占用全宽度(分割成相等的大小)，将以下应用到TabLayout视图:

TabLayout tabLayout = (TabLayout) findViewById(R.id.your_tab_layout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setTabMode(TabLayout.MODE_FIXED);