ImageView在Android应用程序的构建中无法在CardView上运行

Question

我正在学习在android studio上为android做一个应用程序，但我遇到了1个问题。我在CardView上添加了ImageView。在预览中，我可以看到ImageView，但是在构建中，我看不到。如何解决？

XML代码：

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.49"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.51">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.CardView
                android:id="@+id/cardView2"
                android:layout_width="393dp"
                android:layout_height="118dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.0"
                app:layout_constraintStart_toStartOf="@+id/cardView"
                app:layout_constraintTop_toBottomOf="@+id/cardView">

                <android.support.constraint.ConstraintLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <ImageView
                        android:id="@+id/imageView4"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="3dp"
                        android:layout_marginEnd="220dp"
                        android:adjustViewBounds="true"
                        android:contentDescription="@string/da"
                        android:cropToPadding="true"
                        android:scaleType="fitXY"
                        android:visibility="visible"
                        app:layout_constraintBottom_toBottomOf="parent"
                        app:layout_constraintEnd_toEndOf="parent"
                        app:layout_constraintStart_toStartOf="parent"
                        app:layout_constraintTop_toTopOf="parent"

    tools:srcCompat="@tools:sample/backgrounds/scenic[15]" />

                    <TextView
                        android:id="@+id/textView9"
                        android:layout_width="210dp"
                        android:layout_height="99dp"
                        android:layout_marginTop="8dp"
                        android:layout_marginBottom="8dp"
                        android:fontFamily="serif"
                        android:text="@string/tri"
                        android:textColor="@android:color/background_dark"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        app:layout_constraintBottom_toBottomOf="parent"
                        app:layout_constraintEnd_toEndOf="parent"
                        app:layout_constraintHorizontal_bias="0.28"
                        app:layout_constraintStart_toEndOf="@+id/imageView4"
                        app:layout_constraintTop_toTopOf="parent"
                        app:layout_constraintVertical_bias="0.65999997" />
                </android.support.constraint.ConstraintLayout>
            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/cardView"
                android:layout_width="385dp"
                android:layout_height="134dp"
                app:layout_constraintBottom_toTopOf="@+id/cardView2"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.48000002">

                <android.support.constraint.ConstraintLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/textView8"
                        android:layout_width="249dp"
                        android:layout_height="109dp"
                        android:layout_alignParentStart="true"
                        android:layout_alignParentTop="true"
                        android:layout_marginTop="8dp"
                        android:layout_marginBottom="8dp"
                        android:fontFamily="serif"
                        android:text="@string/b"
                        android:textAlignment="viewStart"
                        android:textColor="@android:color/background_dark"
                        android:textSize="20sp"
                        android:textStyle="bold"
                        android:visibility="visible"

    app:layout_constraintBottom_toBottomOf="@+id/imageView3"
                        app:layout_constraintEnd_toEndOf="parent"
                        app:layout_constraintHorizontal_bias="0.0"
                        app:layout_constraintStart_toEndOf="@+id/imageView3"
                        app:layout_constraintTop_toTopOf="parent"
                        app:layout_constraintVertical_bias="0.666" />

                    <ImageView
                        android:id="@+id/imageView3"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:adjustViewBounds="true"
                        android:contentDescription="@string/da"
                        android:cropToPadding="true"
                        android:scaleType="fitXY"
                        android:visibility="visible"
                        app:layout_constraintBottom_toBottomOf="parent"
                        app:layout_constraintEnd_toStartOf="@+id/textView8"
                        app:layout_constraintStart_toStartOf="parent"
                        app:layout_constraintTop_toTopOf="parent"
                        tools:srcCompat="@tools:sample/avatars[0]" />
                </android.support.constraint.ConstraintLayout>
            </android.support.v7.widget.CardView>
        </android.support.constraint.ConstraintLayout>
    </ScrollView>

</android.support.constraint.ConstraintLayout>

Main_activity为空：D

我所期望的 https://cdn1.savepice.ru/uploads/2018/12/24/eae2df1528a0b3949d7daf1bf82132d1-full.jpg

我所拥有的 https://cdn1.savepice.ru/uploads/2018/12/24/8c78dd0e5a98d622a429a08bca14c8bb-full.jpg

抱歉，这是一个愚蠢的问题，但我在Google上找不到解决方案

Answer 1

做这个

tools:srcCompat="@tools:sample/backgrounds/scenic[15]"

为此：

 app:srcCompat="@tools:sample/backgrounds/scenic[15]"

实际上，请添加其他可绘制对象，因为这些头像仅用于示例版本，不适用于构建版本。

为了避免这种情况

AAPT：错误：“ @ tools：sample / avatars”与属性srcCompat（attr）参考[弱]不兼容。

使用可绘制

<androidx.appcompat.widget.AppCompatImageView
    android:id="@+id/imageView"
    android:layout_width="300dp"
    android:layout_height="300dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    app:srcCompat="@drawable/ic_logo"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />