ViewPager2 中的片段未填充高度

Question

我已经使用 TabLayout 设置了 ViewPager2，以便通过轻扫或单击选项卡来切换片段。我知道的问题是我的片段没有占用所有 space 并且我在底部有一个空的 space 我无法滑动。我怎样才能让我的碎片填满 space?

编辑：我认为我的问题与我试图将我的 viewpager 加载到另一个片段中这一事实有关。我将我的代码复制到一个新项目中，而不是将我的代码加载到一个片段中，而是将它加载到主 activity 中并且它已经工作了。在片段中加载 viewpager 是一种不好的做法吗？

我已经像这样更改了我的ProfileFragment.kt，但它仍然无法正常工作：

class ProfileFragment : Fragment() {

    private lateinit var tabsText: List<String>
    private val adapter by lazy {
        ViewPagerAdapter(childFragmentManager, lifecycle)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        tabsText = listOf<String>(getString(R.string.user_info),
            getString(R.string.saved_recipes), getString(R.string.shopping_list))
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_profile, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        pager.adapter = adapter

        TabLayoutMediator(tabs, pager) { tab, position ->
            tab.text = tabsText.get(position)
        }.attach()
    }
}

class ViewPagerAdapter(manager: FragmentManager, lifecycle: Lifecycle): FragmentStateAdapter(manager, lifecycle) {
    override fun getItemCount(): Int = 3

    override fun createFragment(position: Int): Fragment = when(position) {
        0 -> UserInfoFragment.newInstance()
        1 -> SavedRecipesFragment.newInstance()
        else -> ShoppingListFragment.newInstance()
    }
}

fragment_profile.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical">

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

ProfileFragment.kt

class ProfileFragment : Fragment() {

    private lateinit var tabsText: List<String>
    private val adapter by lazy {
        ViewPagerAdapter(this)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        tabsText = listOf<String>(getString(R.string.user_info),
            getString(R.string.saved_recipes), getString(R.string.shopping_list))
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_profile, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)


        pager.adapter = adapter

        TabLayoutMediator(tabs, pager) { tab, position ->
            tab.text = tabsText.get(position)
        }.attach()
    }
}

class ViewPagerAdapter(fragment: Fragment): FragmentStateAdapter(fragment) {
    override fun getItemCount(): Int = 3

    override fun createFragment(position: Int): Fragment = when(position) {
        0 -> UserInfoFragment.newInstance()
        1 -> SavedRecipesFragment.newInstance()
        else -> ShoppingListFragment.newInstance()
    }
}

我正在加载的其中一个片段有这个 xml： fragment_user_info.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:orientation="vertical"
    android:padding="8dp">

    <TextView
        android:id="@+id/username_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:drawableTop="@drawable/ic_account_circle_black_56dp"
        android:text="@string/username" />

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/init_info_age"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/username_text"
        android:layout_marginTop="8dp"
        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
        android:hint="@string/age"
        app:helperTextEnabled="true"
        app:helperText="@string/fui_required_field">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/init_info_age_editText"
            android:inputType="number"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />

    </com.google.android.material.textfield.TextInputLayout>


    <LinearLayout
        android:id="@+id/linear_layout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false"
        android:layout_below="@id/init_info_age">

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/profile_info_height"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"

            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:hint="@string/height"
            app:helperTextEnabled="true"
            app:helperText="@string/fui_required_field"
            >

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/profile_info_height_editText"
                android:inputType="number"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                />

        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/profile_info_weight"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginTop="8dp"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:hint="@string/weight"
            app:helperTextEnabled="true"
            app:helperText="@string/fui_required_field"
            >

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/profile_info_weight_editText"
                android:inputType="number"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                />

        </com.google.android.material.textfield.TextInputLayout>

    </LinearLayout>

    <LinearLayout
        android:id="@+id/linear_layout2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false"
        android:layout_below="@id/linear_layout1">

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/profile_gender"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginTop="8dp"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
            android:hint="@string/gender"
            >

            <AutoCompleteTextView
                android:id="@+id/autocomplete_view_gender"
                android:labelFor="@id/profile_gender"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                tools:ignore="LabelFor" />

        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/profile_lifestyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginTop="8dp"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
            android:hint="@string/activity"
            >

            <AutoCompleteTextView
                android:id="@+id/autocomplete_view_lifestyle"
                android:labelFor="@id/profile_gender"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                tools:ignore="LabelFor" />

        </com.google.android.material.textfield.TextInputLayout>

    </LinearLayout>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/edit"
        android:layout_below="@id/linear_layout2"
        android:layout_alignParentEnd="true"/>



</RelativeLayout>

Answer 1

您的 ViewPager 的高度设置为 wrap_content 因此它的高度尽可能小。尝试将其设置为 0dp 并设置 android:layout_weight="1".

您可能还想使用 ConstraintLayout 而不是 LinearLayout。尝试：

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        app:layout_constraintTop_toTopOf="parent"
        app:tabMode="fixed" />

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tabs" />

</androidx.constraintlayout.widget.ConstraintLayout>

这将使您的 ViewPager 高度从 TabLayout 的底部到父布局的底部。

我从你的示例代码（我不得不模拟你的片段和字符串资源）结合我的 ConstraintLayout xml:

ViewPager2 中的片段未填充高度

Fragments in ViewPager2 not filling height

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