C:\Users\Juan\AndroidStudioProjects\Sinergi\app\src\main\res\layout\activity_feed.xml:90: error: attribute layout_constraintStart_toStartOf (aka com.living_algorithm.sinergi:layout_constraintStart_toStartOf) not found.
C:\Users\Juan\AndroidStudioProjects\Sinergi\app\src\main\res\layout\activity_feed.xml:90: error: attribute layout_constraintTop_toBottomOf (aka com.living_algorithm.sinergi:layout_constraintTop_toBottomOf) not found.
我的错误
Command: C:\Users\Juan\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.0-4818971-windows.jar\54a0692c01a8c149cd9024715c187bd5\aapt2-3.2.0-4818971-windows\aapt2.exe link -I\
C:\Users\Juan\AppData\Local\Android\Sdk\platforms\android-28\android.jar\
--manifest\
C:\Users\Juan\AndroidStudioProjects\Sinergi\app\build\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
-o\
C:\Users\Juan\AndroidStudioProjects\Sinergi\app\build\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
-R\
@C:\Users\Juan\AndroidStudioProjects\Sinergi\app\build\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
--auto-add-overlay\
--java\
C:\Users\Juan\AndroidStudioProjects\Sinergi\app\build\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
--custom-package\
com.living_algorithm.sinergi\
-0\
apk\
--output-text-symbols\
C:\Users\Juan\AndroidStudioProjects\Sinergi\app\build\intermediates\symbols\debug\R.txt\
--no-version-vectors
Daemon: AAPT2 aapt2-3.2.0-4818971-windows Daemon #0
在拖动某些图像和文本时，我自动收到此错误。谁能帮我吗？
这是我的代码
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
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=".feed"
android:id="@+id/drawerLayout">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
我的图片视图
<ImageView
android:id="@+id/imageView5"
android:layout_width="329dp"
android:layout_height="188dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="12dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.205"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView6"
app:srcCompat="@drawable/photo1" />
<ImageView
android:id="@+id/imageView6"
android:layout_width="51dp"
android:layout_height="73dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/face" />
我的文字视图
<TextView
android:id="@+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:text="John Wick"
android:textColor="@android:color/holo_blue_dark"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="@+id/textView11"
app:layout_constraintStart_toEndOf="@+id/imageView6"
app:layout_constraintTop_toTopOf="parent" />
my Text View
<TextView
android:id="@+id/textView10"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="German far-right mobilized by 'fake news' after stabbing: officials"
android:textColor="@android:color/background_dark"
android:textSize="24sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView5" />
<TextView
android:id="@+id/textView11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginBottom="16dp"
android:text="Reporter"
android:textColor="@android:color/darker_gray"
app:layout_constraintBottom_toTopOf="@+id/imageView5"
app:layout_constraintStart_toEndOf="@+id/imageView6"
app:layout_constraintTop_toBottomOf="@+id/textView8" />
下一行
<TextView
android:id="@+id/textView12"
android:layout_width="0dp"
android:layout_height="90dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="DRESDEN/BERLIN (Reuters) - Far-right groups spread “fake news” on social media to mobilize their supporters for violent protests targeting migrants after the fatal stabbing of a German man, said officials in the eastern German state of Saxony where they took place."
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView10" />
</android.support.constraint.ConstraintLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:menu="@menu/menu"
android:layout_gravity="start">
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
有人可以帮助我吗？我不知道为什么在移动图像后会发生这种情况，还是应该将gradle插件从3.2.0降级到3.1.4，因为我听说它总是在gradle插件版本3.2.0中发生
答案 0 :(得分：0)
您需要将强制性属性app:layout_constraintStart_toStartOf和app:layout_constraintTop_toBottomOf添加到XML中，以定义Constraintlayout。
答案 1 :(得分：0)
可能您没有正确使用app名称空间。我猜您正在像下面这样引用layout_constraintStart_toStartOf：
<SomeView app:layout_constraintStart_toStartOf="..." />
并且在xml文件中没有正确引用应用程序名称空间。
如果ConstraintLayout是您的根视图，则它必须类似于以下内容
<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" />
注意xmlns:app的值。
如果您需要在应用包中引用自定义视图的自定义属性，则必须在根视图中定义其他名称空间
xmlns:custom="http://schemas.android.com/apk/res/com.example.customviews"