ViewPager2中的碎片未填充高度

Question

我用TabLayout设置了ViewPager2，以便通过滑动或单击选项卡来切换片段。我所知道的问题是，我的碎片并没有占据所有的空间，我在底部有一个无法滑动的空白空间。我怎样才能把我的碎片填满那个空间？

编辑：我认为我的问题与我试图在另一个片段中加载我的视图寻呼机这一事实有关。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，而是将它加载到主活动中，并且它已经工作了。在片段中加载视图寻呼机是一种不好的做法吗？

我已经改变了我的ProfileFragment.kt像这样，但它仍然不工作：

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。千吨级

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()
    }
}

我正在加载的一个片段具有以下xml:fragment\u user\u 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\u content”（包裹内容），因此其高度尽可能小。尝试将其设置为0dp，然后设置android:layout\u weight=“1”。

您还可能希望使用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从表格布局的底部到父布局的底部。

我从您的示例代码（我不得不模拟您的片段和字符串资源）以及我的ConstraintLayout xml得到了这个结果：