java - 如何在约束布局中将 9X 大小相同的按钮放在 ImageView 上？

Question

我在约束布局中有一个 ImageView，如下所示

<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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
    android:id="@+id/imageView"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginTop="8dp"
    android:adjustViewBounds="true"
    android:cropToPadding="false"
    android:scaleType="fitXY"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@drawable/argentina"
    android:layout_marginLeft="16dp"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintVertical_bias="0.501"
    android:layout_marginRight="16dp"
    android:layout_marginStart="16dp"
    android:layout_marginEnd="16dp" />

我想用 9X 大小相同的按钮覆盖此图像，如下所示

注意 Imageview 随着约束布局的大小而变化

Answer 1

是的，您可以使用constraint chain和ma​​tch_constraint(0dp)属性来实现这一点您必须在此处定义垂直 和 水平 链到所有按钮，下面是相同的示例

<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"
    tools:layout_editor_absoluteY="81dp"
    tools:layout_editor_absoluteX="0dp">



        <ImageView
            android:id="@+id/imageView"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginTop="8dp"
            android:adjustViewBounds="true"
            android:cropToPadding="false"
            android:scaleType="fitXY"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/firefox"
            android:layout_marginLeft="16dp"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintVertical_bias="0.501"
            android:layout_marginRight="16dp"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp" />
        <Button
            android:id="@+id/button1"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintEnd_toEndOf="@+id/imageView"
            app:layout_constraintTop_toTopOf="@+id/imageView"
            app:layout_constraintStart_toEndOf="@+id/button5"
            app:layout_constraintBottom_toTopOf="@id/button41"
            app:layout_constraintVertical_chainStyle="spread_inside"/>


        <Button
            android:id="@+id/button31"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintStart_toStartOf="@+id/imageView"
            app:layout_constraintTop_toTopOf="@+id/imageView"
            app:layout_constraintBottom_toTopOf="@id/button311"
            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constraintEnd_toStartOf="@+id/button51"
            app:layout_constraintVertical_chainStyle="spread_inside" />

        <Button
            android:id="@+id/button5"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintTop_toTopOf="@+id/imageView"
            app:layout_constraintEnd_toStartOf="@+id/button11"
            app:layout_constraintStart_toEndOf="@+id/button13"
            app:layout_constraintBottom_toTopOf="@+id/button133"
            app:layout_constraintVertical_chainStyle="spread_inside" />




        <Button
            android:id="@+id/button311"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintStart_toStartOf="@+id/imageView"
            app:layout_constraintTop_toBottomOf="@+id/button31"
            app:layout_constraintBottom_toTopOf="@+id/button13"
            app:layout_constraintEnd_toStartOf="@+id/button133"
            app:layout_constraintHorizontal_chainStyle="spread_inside" />

        <Button
            android:id="@+id/button133"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintStart_toEndOf="@+id/button311"
            app:layout_constraintEnd_toStartOf="@+id/button41"
            app:layout_constraintTop_toBottomOf="@+id/button5"
            app:layout_constraintBottom_toTopOf="@+id/button51" />
        <Button
            android:id="@+id/button41"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:layout_constraintEnd_toEndOf="@+id/imageView"
            android:text="Button"
            app:layout_constraintTop_toBottomOf="@+id/button1"
            app:layout_constraintBottom_toTopOf="@+id/button11"
            app:layout_constraintStart_toEndOf="@+id/button133" />

        <Button
            android:id="@+id/button11"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintEnd_toEndOf="@+id/imageView"
            app:layout_constraintBottom_toBottomOf="@+id/imageView"
            app:layout_constraintStart_toEndOf="@+id/button51"
            app:layout_constraintTop_toBottomOf="@id/button41"
            />


        <Button
            android:id="@+id/button13"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintStart_toStartOf="@+id/imageView"
            app:layout_constraintBottom_toBottomOf="@+id/imageView"
            app:layout_constraintTop_toBottomOf="@id/button311"
            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constraintEnd_toStartOf="@+id/button51" />

        <Button
            android:id="@+id/button51"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="Button"
            app:layout_constraintBottom_toBottomOf="@+id/imageView"
            app:layout_constraintEnd_toStartOf="@+id/button11"
            app:layout_constraintStart_toEndOf="@+id/button13"
            app:layout_constraintTop_toBottomOf="@id/button133"/>
</android.support.constraint.ConstraintLayout>

这是设计和蓝图

您可以在此处获取有关链和约束的所有详细信息 https://developer.android.com/reference/android/support/constraint/ConstraintLayout.html#Chains

这适用于所有设备尺寸和方向

注意:我建议您也向 ImageView 添加一些 minHeight，以避免隐藏按钮，但我不知道您的要求，但这是一个值得注意的点