我和一个同学 现在在Github上分享了我们的项目。 他的XML预览器看起来不错,并且可以正常工作。 但是我的XML预览器有一些错误 我想念我的预览器为何与最终结果如此不同?
我的视图(离开Android Studio的内置,再离开仿真器):
他的视图(工作正常-左侧为Android Studio,右侧为模拟器):
我的布局文件
<?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"
android:background="@color/colorBackground"
tools:context=".UserInterface.MainActivity">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/button_shopingEntryAdd"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="?attr/actionModeSplitBackground"
android:clickable="true"
android:src="@drawable/trashcan"
android:visibility="invisible"
app:backgroundTint="@android:color/holo_green_light"
app:layout_constraintBottom_toTopOf="@+id/guideline57"
app:layout_constraintEnd_toStartOf="@+id/guideline51"
app:layout_constraintStart_toStartOf="@+id/guideline55"
app:layout_constraintTop_toTopOf="@+id/guideline56"
tools:visibility="visible" />
<ListView
android:id="@+id/listView"
android:layout_width="0dp"
android:layout_height="0dp"
app:autoSizeTextType="uniform"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/view_Topbar">
</ListView>
<View
android:id="@+id/view_Topbar"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@drawable/round_corner"
app:layout_constraintBottom_toTopOf="@+id/guideline14"
app:layout_constraintEnd_toStartOf="@+id/guideline51"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="@+id/guideline3"
app:layout_constraintTop_toTopOf="@+id/guideline4"
app:layout_constraintVertical_bias="1.0" />
<Button
android:id="@+id/btnNavFrag1"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@drawable/fragment_active_button"
android:fontFamily="casual"
android:includeFontPadding="false"
android:text="@string/fragment1_name"
android:textSize="13sp"
app:layout_constraintBottom_toTopOf="@+id/guideline11"
app:layout_constraintEnd_toStartOf="@+id/guideline8"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline10" />
<Button
android:id="@+id/btnNavFrag2"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@drawable/fragment_buttons"
android:fontFamily="casual"
android:text="@string/fragment2_name"
android:textSize="13sp"
app:layout_constraintBottom_toBottomOf="@+id/btnNavFrag1"
app:layout_constraintEnd_toStartOf="@+id/guideline9"
app:layout_constraintStart_toStartOf="@+id/guideline8"
app:layout_constraintTop_toTopOf="@+id/guideline10" />
<Button
android:id="@+id/btnNavFrag3"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@drawable/fragment_buttons"
android:fontFamily="casual"
android:text="@string/fragment3_name"
android:textSize="13sp"
app:layout_constraintBottom_toTopOf="@+id/guideline11"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline9"
app:layout_constraintTop_toTopOf="@+id/guideline10" />
<Button
android:id="@+id/button_navSecond"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@drawable/menu"
app:layout_constraintBottom_toTopOf="@+id/guideline52"
app:layout_constraintEnd_toStartOf="@+id/guideline19"
app:layout_constraintStart_toStartOf="@+id/guideline3"
app:layout_constraintTop_toTopOf="@+id/guideline53"
tools:visibility="visible" />
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:collapseIcon="@android:drawable/ic_menu_call"
app:layout_constraintBottom_toTopOf="@+id/guideline10"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/textView_titleP2"
android:layout_width="202dp"
android:layout_height="58dp"
android:autoText="false"
android:fontFamily="casual"
android:gravity="center"
android:text="FoodGent"
android:textColor="#FAFAFA"
android:textSize="30sp"
android:textStyle="bold"
app:autoSizeTextType="uniform"
app:layout_constraintBottom_toTopOf="@+id/guideline10"
app:layout_constraintStart_toStartOf="@+id/guideline19"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView_topBarName"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:fontFamily="casual"
android:gravity="center"
android:text="@string/fragment1_name"
android:textSize="15sp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="@+id/guideline14"
app:layout_constraintEnd_toStartOf="@+id/guideline51"
app:layout_constraintStart_toStartOf="@+id/guideline3"
app:layout_constraintTop_toTopOf="@+id/guideline4" />
<Button
android:id="@+id/button_add"
android:layout_width="0dp"
android:layout_height="0dp"
android:autoText="false"
android:background="@drawable/empty_drawable"
android:gravity="center"
android:text="+"
android:textColor="@color/colorBackground"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline10"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@+id/guideline32"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.05352798" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline51"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.95" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline5"
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="vertical"
app:layout_constraintGuide_percent="1.0" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline32"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.88" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline55"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.81" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.33819953" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.66423357" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.58" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline19"
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.09" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.15" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.08" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline52"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.05" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline53"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.034" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline11"
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.14" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline14"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.18" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline56"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.89" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline57"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.98" />
</androidx.constraintlayout.widget.ConstraintLayout>