Question

我已将TabLayout（来自支持库v22.2.1）添加到我的片段中：

<android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        style="@style/MyColorAccentTabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="scrollable"/>

问题在于，当片段的方向是横向时（在片段的初始创建之前或之后），TabLayout与Fragment的宽度不匹配（是的，父级的宽度也设置为match_parent）。

当屏幕宽度很小时（即并非所有标签都可以同时显示）：

当屏幕宽度足以显示所有标签时（请参阅右侧的空白处）：

如果我将tabMode更改为固定，则填充宽度但标签太小。那里有适当的解决方案吗？

Answer 1

而不是创建自定义TabLayout和黑客攻击或创建更多布局，作为TabLayout的包装仅用于背景。试试这个，

<android.support.design.widget.TabLayout
    android:id="@+id/tabs"
    style="@style/MyColorAccentTabLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    <!-- Instead of setting app:tabBackground -->
    android:background="@color/colorAccent"
    app:tabGravity="fill"
    app:tabMode="scrollable"/>

这会将背景设置为tabLayout后面，而不是在每个标签后面设置背景。

Answer 2

试试这个，它是一个设置tabMaxWidth="0dp"，tabGravity="fill"和tabMode="fixed"的解决方法。

 <android.support.v4.view.ViewPager
     android:id="@+id/container"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     app:layout_behavior="@string/appbar_scrolling_view_behavior">
     <android.support.design.widget.TabLayout
         android:id="@+id/tabs"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:tabMaxWidth="0dp"
         app:tabGravity="fill"
         app:tabMode="fixed"/>
</android.support.v4.view.ViewPager>

10英寸平板电脑的屏幕截图：

Answer 3

我想这是达到你想要的最简单方法。

public class CustomTabLayout extends TabLayout {
    public CustomTabLayout(Context context) {
        super(context);
    }

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

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        try {
            if (getTabCount() == 0)
                return;
            Field field = TabLayout.class.getDeclaredField("mTabMinWidth");
            field.setAccessible(true);
            field.set(this, (int) (getMeasuredWidth() / (float) getTabCount()));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 4

这是我的 2021 Kotlin 解决方案。它实现了我无法从其他答案中做到的以下内容：

如果标签不多，它们会展开以填满整个宽度。
如果有很多选项卡，它们是可滚动的，所以它们不会被压扁。
即使 tabLayout 不是屏幕的全宽也能正常工作。

为了实现这一点，我创建了一个 TabLayout 的子类来覆盖 onMeasure

class ScalableTabLayout : TabLayout {
    constructor(context: Context) : super(context)
    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
        context,
        attrs,
        defStyleAttr
    )

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        val tabLayout = getChildAt(0) as ViewGroup
        val childCount = tabLayout.childCount
        if (childCount > 0) {
            val widthPixels = MeasureSpec.getSize(widthMeasureSpec)
            val tabMinWidth = widthPixels / childCount
            var remainderPixels = widthPixels % childCount
            tabLayout.forEachChild {
                if (remainderPixels > 0) {
                    it.minimumWidth = tabMinWidth + 1
                    remainderPixels--
                } else {
                    it.minimumWidth = tabMinWidth
                }
            }
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
    }
}

然后在我的布局文件中使用它：

<com.package.name.ScalableTabLayout
    android:id="@+id/tabs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabMaxWidth="0dp"
    app:tabMode="scrollable" />

同时需要 tabMaxWidth="0dp" 和 tabMode="scrollable"

Answer 5

请使用它，它肯定会解决这个问题

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

Answer 6

尝试进行此更改

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

Answer 7

我几乎尝试了所有答案，最后发现这就像一个咒语。

public void dynamicSetTabLayoutMode(TabLayout tabLayout) {
            int tabWidth = calculateTabWidth(tabLayout);
            int screenWidth =  getApplicationContext().getResources().getDisplayMetrics().widthPixels;
            if (tabWidth <= screenWidth) {
                tabLayout.setTabMode(TabLayout.MODE_FIXED);
            } else {
                tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
            }
        }
    
      private int calculateTabWidth(TabLayout tabLayout) {
            int tabWidth = 0;
            for (int i = 0; i < tabLayout.getChildCount(); i++) {
                final View view = tabLayout.getChildAt(i);
                view.measure(0, 0); 
                tabWidth += view.getMeasuredWidth();
            }
            return tabWidth;
        }

Answer 8

这是一种确保制表符的宽度等于制表符的字符串长度的简便方法

<androidx.viewpager.widget.ViewPager
    android:id="@+id/vpTabs"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMaxWidth="0dp"
        app:tabMode="scrollable"/>

</androidx.viewpager.widget.ViewPager>

使用以下代码：-

app:tabMaxWidth="0dp"
app:tabMode="scrollable"

Answer 9

此解决方案的工作原理是让android创建标签，然后计算标签的总宽度。然后检查选项卡是否适合屏幕宽度，如果适合，则将tabMode设置为“固定”，从而缩放所有选项卡以适合屏幕宽度。

选项卡布局xml，父级无关紧要：

<com.google.android.material.tabs.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="scrollable"/>

然后在您的活动onCreate或onCreateView的片段中

var totalWidth = 0
var maxWidth = 0
for (i in 0 until tabLayout.tabCount) {
    val tabWidth = (tabLayout.getChildAt(0) as ViewGroup).getChildAt(i)!!.width
    totalWidth += tabWidth
    maxWidth = max(maxWidth, tabWidth)
}
val screenWidth = Resources.getSystem().displayMetrics.widthPixels

if (totalWidth <  screenWidth&& screenWidth/ tabLayout.tabCount >= maxWidth) {

    tabLayout.tabMode = TabLayout.MODE_FIXED
}

如果您将TabLayout与Viewpager一起使用，则必须设置layoutChangeListener，因为选项卡在开始时不会膨胀。

在您的活动onCreate或onCreateView片段中：

tabLayout.addOnLayoutChangeListener { _, _, _, _, _, _, _, _, _ ->
    var totalWidth = 0
    var maxWidth = 0
    for (i in 0 until tabLayout.tabCount) {
        val tabWidth = (tabLayout.getChildAt(0) as ViewGroup).getChildAt(i)!!.width
        totalWidth += tabWidth
        maxWidth = max(maxWidth, tabWidth)
    }

     val screenWidth = Resources.getSystem().displayMetrics.widthPixels

    if (totalWidth < screenWidth && screenWidth / tabLayout.tabCount >= maxWidth) {

        tabLayout.tabMode = TabLayout.MODE_FIXED
    }
}

注意：如果希望tabMode为“ fixed”时所有选项卡的文本大小都相同，则必须从styles.xml中手动设置textSize。

Answer 10

我也很挣扎，上面的大多数选项对我都不起作用，因此我根据DTX12的答案创建了一个版本。

我有一个布尔值可否检查平板电脑，并检查风景和肖像。然后根据标签数量设置布局。

您可能需要公开该方法，并在轮换/配置更改时调用它。

在CustomTabLayout代码中，我替换了mintabswidth方法

private void initTabMinWidth()
{



    boolean isTablet = getContext().getResources().getBoolean(R.bool.device_is_tablet);
    boolean isLandscape = (wh[WIDTH_INDEX] > wh[HEIGHT_INDEX]) ? true : false;


    if (isTablet)
    {
        if (isLandscape)
        {
            if (this.getTabCount() > 8)
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_SCROLLABLE);
            } else
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_FIXED);
            }
        } else
        {
            if (this.getTabCount() > 6)
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_SCROLLABLE);
            } else
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_FIXED);
            }
        }
    } else
    {
        if (isLandscape)
        {
            if (this.getTabCount() > 6)
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_SCROLLABLE);
            } else
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_FIXED);
            }
        } else
        {
            if (this.getTabCount() > 4)
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_SCROLLABLE);
            } else
            {
                this.setTabGravity(TabLayout.GRAVITY_FILL);
                this.setTabMode(TabLayout.MODE_FIXED);
            }
        }
    }


}

Answer 11

花了两天时间找出问题后，现在终于可以为我工作了。请参阅@Tyler V的答案check here 泰勒（Tyler）的回答 “在调用super.onMeasure（）之前设置最小宽度是关键。” 非常重要

Answer 12

只需按照这种方式进行操作，然后添加user_token并同时使用Intent i = new Intent(context, hshowreminderpic1.class); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(i);

app:tabMaxWidth="0dp"

Answer 13

<android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        app:tabMode="scrollable"/>

Answer 14

这是我的解决方案，其中tabMode设置为： app：tabMode =“ scrollable”

class MyTabLayout(
  context: Context,
  attrs: AttributeSet?
) : TabLayout(context, attrs) {

  override fun onMeasure(
    widthMeasureSpec: Int,
    heightMeasureSpec: Int
  ) {

    val equalTabWidth= (MeasureSpec.getSize(widthMeasureSpec) / tabCount.toFloat()).toInt()

    for (index in 0..tabCount) {
      val tab = getTabAt(index)
      val tabMeasuredWidth = tab?.view?.measuredWidth ?: equalTabWidth

      if (tabMeasuredWidth < equalTabWidth) {
        tab?.view?.minimumWidth = equalTabWidth
      }
    }

    super.onMeasure(widthMeasureSpec, heightMeasureSpec)
  }
}

Answer 15

你可以在tablayout中使用 app：tabMaxWidth =“0dp”

Answer 16

如果要显示标签'fill'，则应设置app：tabMode =“fixed”。

scanf()

Answer 17

请检查一下，我认为它有效

公共类MainActivity扩展了AppCompatActivity {

private TextView mTxv_Home, mTxv_News, mTxv_Announcement;
private View mView_Home, mView_News, mView_Announcements;
private HorizontalScrollView hsv;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mTxv_Home = (TextView) findViewById(R.id.txv_home);
    mTxv_News = (TextView) findViewById(R.id.txv_news);
    mTxv_Announcement = (TextView) findViewById(R.id.txv_announcements);
    mView_Home = (View) findViewById(R.id.view_home);
    mView_News = (View) findViewById(R.id.view_news);
    mView_Announcements = (View) findViewById(R.id.view_announcements);
    hsv = (HorizontalScrollView) findViewById(R.id.hsv);
    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);
    DisplayMetrics displaymetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
    int wt = displaymetrics.widthPixels/3;
    mTxv_Home.setWidth(wt);
    mTxv_News.setWidth(wt);
   // mTxv_Announcement.setWidth(wt);
    mTxv_Home.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            mTxv_Home.setTextColor(Color.parseColor("#3F51B5"));
            mTxv_News.setTextColor(Color.parseColor("#808080"));
            mTxv_Announcement.setTextColor(Color.parseColor("#808080"));
            mView_Home.setBackgroundColor(Color.parseColor("#3F51B5"));
            mView_News.setBackgroundColor(Color.parseColor("#E8E8E8"));
            mView_Announcements.setBackgroundColor(Color.parseColor("#E8E8E8"));
            hsv.post(new Runnable() {
                public void run() {
                    hsv.fullScroll(HorizontalScrollView.FOCUS_LEFT);
                }
            });
            viewPager.setCurrentItem(0);
        }
    });
    mTxv_News.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mTxv_Home.setTextColor(Color.parseColor("#808080"));
            mTxv_News.setTextColor(Color.parseColor("#3F51B5"));
            mTxv_Announcement.setTextColor(Color.parseColor("#808080"));
            mView_Home.setBackgroundColor(Color.parseColor("#E8E8E8"));
            mView_News.setBackgroundColor(Color.parseColor("#3F51B5"));
            mView_Announcements.setBackgroundColor(Color.parseColor("#E8E8E8"));
            hsv.post(new Runnable() {
                public void run() {
                    int centerX = hsv.getChildAt(0).getWidth()/2;
                    hsv.scrollTo(centerX, 0);
                }
            });
            viewPager.setCurrentItem(1);


        }
    });
    mTxv_Announcement.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mTxv_Home.setTextColor(Color.parseColor("#808080"));
            mTxv_News.setTextColor(Color.parseColor("#808080"));
            mTxv_Announcement.setTextColor(Color.parseColor("#3F51B5"));
            mView_Home.setBackgroundColor(Color.parseColor("#E8E8E8"));
            mView_News.setBackgroundColor(Color.parseColor("#E8E8E8"));
            mView_Announcements.setBackgroundColor(Color.parseColor("#3F51B5"));
            hsv.post(new Runnable() {
                public void run() {
                    hsv.fullScroll(HorizontalScrollView.FOCUS_RIGHT);
                }
            });
            viewPager.setCurrentItem(2);
        }
    });

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {

            if (position == 0) {
                mTxv_Home.setTextColor(Color.parseColor("#3F51B5"));
                mTxv_News.setTextColor(Color.parseColor("#808080"));
                mTxv_Announcement.setTextColor(Color.parseColor("#808080"));
                mView_Home.setBackgroundColor(Color.parseColor("#3F51B5"));
                mView_News.setBackgroundColor(Color.parseColor("#E8E8E8"));
                mView_Announcements.setBackgroundColor(Color.parseColor("#E8E8E8"));
                hsv.post(new Runnable() {
                    public void run() {
                        hsv.fullScroll(HorizontalScrollView.FOCUS_LEFT);
                    }
                });


            } else if (position == 1) {
                mTxv_Home.setTextColor(Color.parseColor("#808080"));
                mTxv_News.setTextColor(Color.parseColor("#3F51B5"));
                mTxv_Announcement.setTextColor(Color.parseColor("#808080"));
                mView_Home.setBackgroundColor(Color.parseColor("#E8E8E8"));
                mView_News.setBackgroundColor(Color.parseColor("#3F51B5"));
                mView_Announcements.setBackgroundColor(Color.parseColor("#E8E8E8"));
                hsv.post(new Runnable() {
                    public void run() {
                        int centerX = hsv.getChildAt(0).getWidth()/2;
                        hsv.scrollTo(centerX, 0);
                    }
                });


            } else if (position == 2) {
                mTxv_Home.setTextColor(Color.parseColor("#808080"));
                mTxv_News.setTextColor(Color.parseColor("#808080"));
                mTxv_Announcement.setTextColor(Color.parseColor("#3F51B5"));
                mView_Home.setBackgroundColor(Color.parseColor("#E8E8E8"));
                mView_News.setBackgroundColor(Color.parseColor("#E8E8E8"));
                mView_Announcements.setBackgroundColor(Color.parseColor("#3F51B5"));
                hsv.post(new Runnable() {
                    public void run() {
                        hsv.fullScroll(HorizontalScrollView.FOCUS_RIGHT);
                    }
                });
            }

        }
        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });
}
private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new HomeFragment(), "Home");
    adapter.addFragment(new NewsFragment(), "News");
    adapter.addFragment(new AnnouncementsFragment(), "Announcements");
    viewPager.setAdapter(adapter);
}

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

}

<HorizontalScrollView
    android:id="@+id/hsv"
    android:layout_width="fill_parent"
    android:layout_height="56dp"
    android:layout_weight="0"
    android:fillViewport="true"
    android:measureAllChildren="false"
    android:scrollbars="none" >
    <LinearLayout
        android:id="@+id/innerLay"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:orientation="horizontal" >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <TextView
                android:id="@+id/txv_home"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:text="Home"
                android:singleLine="true"
                android:paddingLeft="35dp"
                android:paddingRight="35dp"
                android:gravity="center"
                android:textSize="15sp"/>
            <View
                android:id="@+id/view_home"
                android:layout_width="match_parent"
                android:layout_height="3dp"
                android:background="@color/colorPrimary"
               />
        </LinearLayout>
        <View
            android:layout_width="1dp"
            android:layout_height="match_parent"
            android:visibility="gone"
            android:background="#e8e8e8"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <TextView
                android:id="@+id/txv_news"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:text="News"
                android:singleLine="true"
                android:paddingLeft="35dp"
                android:paddingRight="35dp"
                android:gravity="center"
                android:textSize="15sp"/>
            <View
                android:id="@+id/view_news"
                android:layout_width="match_parent"
                android:layout_height="3dp"
                android:background="#e8e8e8"/>
        </LinearLayout>
        <View
            android:layout_width="1dp"
            android:layout_height="match_parent"
            android:visibility="gone"
            android:background="#e8e8e8"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <TextView
                android:id="@+id/txv_announcements"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:singleLine="true"
                android:text="Announcements"
                android:paddingLeft="35dp"
                android:paddingRight="35dp"
                android:gravity="center"
                android:textSize="15sp"/>
            <View
                android:id="@+id/view_announcements"
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#e8e8e8"/>
        </LinearLayout>

    </LinearLayout>
</HorizontalScrollView>
<android.support.v4.view.ViewPager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/hsv" />

Answer 18

我并不关心填充宽度的标签，但我关心的是背景颜色没有扩展到全宽。所以我想到了这个解决方案，我在其后面放置一个FrameLayout，其背景颜色与标签相同。

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/MyColor">
    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        style="@style/MyCustomTabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="scrollable"/>
</FrameLayout>

Answer 19

如果任何标签标题大于（measuredWidth / tabCount），则

@ dtx12 answer不起作用。

这种情况有我的TabLayout子类（在Kotlin中）。我希望这会对某人有所帮助。

class FullWidthTabLayout : TabLayout {

    constructor(context: Context?) : super(context)

    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)

    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
        super.onLayout(changed, l, t, r, b)
        if (changed) {
            val widths = mutableListOf<Int>()
            for (i in 0..this.tabCount - 1) {
                widths.add(this.getTabAt(i)!!.customView!!.width)
            }

            if (widths.sum() < this.measuredWidth) {
                var equalPart: Long = this.measuredWidth.toLong() / this.tabCount.toLong()
                var biggerWidths = widths.filter { it > equalPart }
                var smallerWidths = widths.filter { it <= equalPart }
                var rest: Long = this.measuredWidth.toLong() - biggerWidths.sum()
                while (biggerWidths.size != 0) {
                    equalPart = rest / smallerWidths.size
                    biggerWidths = smallerWidths.filter { it >= equalPart }
                    smallerWidths = smallerWidths.filter { it < equalPart }
                    rest -= biggerWidths.sum()
                }
                val minWidth = (rest / smallerWidths.size) + 10 //dont know why there is small gap on the end, thats why +10
                for (i in 0..this.tabCount - 1) {
                    this.getTabAt(i)!!.customView!!.minimumWidth = minWidth.toInt()
                }
            }
        }
    }
}

当tabMode设置为＆＃39;可滚动时，TabLayout不填充宽度＆＃39;

19 个答案: