元素放在状态栏和底部导航栏后面

Question

底部导航视图在底部导航栏后面，工具栏在状态栏后面

我是android的新手，从第一天起我就被这个问题所困扰。我曾尝试为工具栏和底部导航视图设置特定的边距，但我不认为这是一个很好的解决方案。有人能帮我一下吗?我也试过Android:fitsystemwindows = "true"但这并没有奏效。下面是片段的XML代码

<androidx.constraintlayout.widget.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"
android:orientation="vertical"
tools:context="fragments.homeUi">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="65dp"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</com.google.android.material.appbar.AppBarLayout>
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="167dp"
android:layout_marginBottom="78dp"
android:text="@string/home"
app:layout_constraintBottom_toTopOf="@+id/signOutButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.029"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="@+id/signOutButton"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_marginStart="143dp"
android:layout_marginTop="44dp"
android:layout_marginEnd="168dp"
android:text="@string/signout"
android:textAllCaps="false"
android:textColor="#736B3B"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView4" />
<androidx.cardview.widget.CardView
android:id="@+id/cardView"
android:layout_width="409dp"
android:layout_height="230dp"
android:layout_marginStart="1dp"
android:layout_marginTop="140dp"
android:layout_marginEnd="1dp"
android:layout_marginBottom="116dp"
app:cardCornerRadius="10dp"
app:layout_constraintBottom_toTopOf="@+id/textView4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewPagerHome"
android:layout_width="409dp"
android:layout_height="230dp"
app:layout_constraintCircleRadius="100dp">
</androidx.viewpager2.widget.ViewPager2>
</androidx.cardview.widget.CardView>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottomNavbar"
android:layout_width="409dp"
android:layout_height="73dp"
android:layout_marginStart="1dp"
android:layout_marginEnd="1dp"
android:background="#fff"
app:itemIconTint="@drawable/bottom_nav_icon_color"
app:itemTextColor="#00B8B4"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/bottom_nav" />

</androidx.constraintlayout.widget.ConstraintLayout>

这里是活动的XML文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".HomeActivity">
<androidx.fragment.app.FragmentContainerView
android:id="@+id/fragmentContainerView"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="409dp"
android:layout_height="867dp"
android:layout_marginStart="1dp"
android:layout_marginTop="1dp"
android:layout_marginEnd="1dp"
android:layout_marginBottom="1dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/nav_home_acitvity" />
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

我认为问题在这里:

android:layout_width="409dp"
android:layout_height="867dp"

设置如下:

android:layout_width="0dp"
android:layout_height="0dp"