无法使用 viewpager 看到 tablayout

Question

这是我的 link 带有 viewpager 的 tablayout 的代码它工作正常但现在它不起作用我无法在我的设备中看到选项卡布局任何人都可以告诉是什么导致了这个问题我认为我的代码是对的

<android.support.design.widget.CoordinatorLayout 
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:id="@+id/arootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.blipclap.creativegraphy.HomeActivity"
tools:showIn="@layout/app_bar_home">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white">

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

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_below="@+id/tabLayout"> 
</android.support.v4.view.ViewPager>

</RelativeLayout>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_gravity="bottom"
        app:layout_behavior=".Helper.BottomNavigationBehaviour"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@color/colorPrimary"
        app:itemIconTint="@android:color/background_dark"
        app:itemTextColor="@android:color/background_dark"
        app:menu="@menu/bottom_navigation_menu"> 
</android.support.design.widget.BottomNavigationView>


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

我这里有适配器

public class MyFragmentAdapter extends FragmentPagerAdapter {

    private Context context;

    public MyFragmentAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.context = context;
    }

    @Override
    public Fragment getItem(int position) {
        if (position == 0)
            return CategoryFragment.getInstance();
        else if (position == 1)
            return TrendingFragment.getInstance();
        else if (position == 2)
            return RecentsFragment.getInstance(context);
        else
            return null;
    }

    @Override
    public int getCount() {
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "Category";
            case 1:
                return "Trending";
            case 2:
                return "Recents";
        }
        return "";
    }}

这是我使用的 activity 代码

 viewPager = (ViewPager)findViewById(R.id.viewPager);
            MyFragmentAdapter adapter = new 
 MyFragmentAdapter(getSupportFragmentManager(), this);
            viewPager.setAdapter(adapter);

            tabLayout = (TabLayout) findViewById(R.id.tabLayout);
            tabLayout.setupWithViewPager(viewPager);

this is the screenshot 如您所见，我无法在我的 phone 中看到选项卡布局，请问有什么问题吗？

我的布局使用所以坐标布局是必要的，底部导航需要出来它应该是协调器布局 child

我发现选项卡布局隐藏在应用栏后面

<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="com.blipclap.creativegraphy.HomeActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay"
        app:theme="@style/ToolbarColoredBackArrow" />

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

<include layout="@layout/content_home" />


</android.support.constraint.ConstraintLayout>

Answer 1

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/arootLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@android:color/white"
        android:orientation="vertical">

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

        <android.support.v4.view.ViewPager
            android:id="@+id/viewPager"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_below="@+id/tabLayout"
            android:layout_weight="1"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    </LinearLayout>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        app:itemIconTint="@android:color/background_dark"
        app:itemTextColor="@android:color/background_dark"
        app:layout_behavior=".Helper.BottomNavigationBehaviour"
        app:menu="@menu/bottom_navigation_menu" />

</LinearLayout>

Answer 2

试试这个对你有帮助

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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:id="@+id/arootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.TabLayout
        android:id="@+id/tab_host"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/holo_red_light"> 
   </android.support.design.widget.TabLayout>
    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/tab_host"
        android:layout_above="@id/design_navigation_view"> 
   </android.support.v4.view.ViewPager>
    <android.support.design.widget.BottomNavigationView
        android:id="@+id/design_navigation_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@android:color/darker_gray"> 
   </android.support.design.widget.BottomNavigationView>
    </RelativeLayout>

Answer 3

解决方法是

     <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
android:layout_marginTop="?attr/actionBarSize"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

选项卡布局实际上在应用栏下，所以我只是

无法使用 viewpager 看到 tablayout

Cant see tablayout with viewpager

android

android-viewpager

android-tablayout