ConstraintLayout 中 ImageView 缩放问题

Question

我将在约束布局中使用ImageView，并希望ImageView的宽度与屏幕宽度相同，高度根据图像动态调整。

我的布局XML如下：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 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"
style="@style/CardView.Light"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp">

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/newsItemBackground"
    tools:layout_editor_absoluteY="29dp">

    <TextView
        android:id="@+id/textTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:textColor="@color/textHighEmphasis"
        android:textSize="@dimen/news_title_size"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Title" />

    <TextView
        android:id="@+id/textTime"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:fontFamily="@font/english_font"
        android:textColor="@color/textMediumEmphasis"
        android:textSize="@dimen/news_time_size"
        android:textStyle="normal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textTitle"
        tools:text="Time" />

    <Button
        android:id="@+id/buttonMore"
        style="@style/Widget.AppCompat.Button.Borderless.Colored"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/buttonShare"
        app:layout_constraintTop_toBottomOf="@+id/viewSeperator"
        app:layout_constraintVertical_bias="0.0"
        tools:text="readmore" />

    <Button
        android:id="@+id/buttonShare"
        style="@style/Widget.AppCompat.Button.Borderless.Colored"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="@string/share_button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/viewSeperator"
        app:layout_constraintVertical_bias="0.0" />


    <TextView
        android:id="@+id/textBody"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:textColor="@color/textHighEmphasis"
        android:textSize="@dimen/news_body_size"
        android:textStyle="normal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageNews"
        tools:text="Body" />


    <View
        android:id="@+id/viewSeperator"
        android:layout_width="0dp"
        android:layout_height="1px"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="@color/cardSeperatorLine"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textBody" />

    <ImageView
        android:id="@+id/imageNews"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textTime"
        app:srcCompat="@drawable/portait_man" />


</android.support.constraint.ConstraintLayout>

</android.support.v7.widget.CardView>

这张图片在Android Studio编辑器中看起来很好，但是当我使用Glide加载它时，图片的顶部和底部被裁剪了。

编辑器中的图片如下：

运行应用时的图片如下：

我正在使用以下代码进行加载：

Glide.with(imageNews.getContext())
                .load(item.image_url)
                .into(imageNews);

更新：Jake和Mehul的回答都给出了这个

- Anoop Krishnan

---

如果您想展示图片并保持其原始宽高比占满整个屏幕，您需要在ScrollView内设置布局。 - Ramees Thattarath

Answer 1

只需设置

android:adjustViewBounds="true"

它将会起效。

- Anoop Krishnan

---

太棒了，这个可行，非常感谢！ - Ola Ström

Answer 2

记住，centerCrop 可能会稍微放大图片。如果你希望 ImageView 根据图片的分辨率具有灵活性，请删除 scaleType，但这可能会导致意外行为。

<ImageView
        android:id="@+id/imageNews"
        android:layout_width="wrap_content" // Changed to wrap_content
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textTime"
        app:srcCompat="@drawable/portait_man" />

- jbmcle

---

限制条件是否良好？例如，视觉编辑器是否没有投诉？ - jbmcle

Answer 3

尝试以下代码

<android.support.v7.widget.CardView 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="wrap_content"
    android:layout_marginTop="8dp">

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

        <TextView
            android:id="@+id/textTitle"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:textStyle="bold"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="Title" />

        <TextView
            android:id="@+id/textTime"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:textStyle="normal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textTitle"
            tools:text="Time" />

        <Button
            android:id="@+id/buttonMore"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/buttonShare"
            app:layout_constraintTop_toBottomOf="@+id/viewSeperator"
            app:layout_constraintVertical_bias="0.0"
            tools:text="readmore" />

        <Button
            android:id="@+id/buttonShare"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:text="share_button"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/viewSeperator"
            app:layout_constraintVertical_bias="0.0" />


        <TextView
            android:id="@+id/textBody"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:textStyle="normal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageNews"
            tools:text="Body" />


        <View
            android:id="@+id/viewSeperator"
            android:layout_width="0dp"
            android:layout_height="1px"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textBody" />

        <ImageView
            android:id="@+id/imageNews"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textTime"
            app:srcCompat="@mipmap/ic_logo" />


    </android.support.constraint.ConstraintLayout>

</android.support.v7.widget.CardView>

请确保临时变量中已经从字符串中删除了您的颜色代码和文本。

更新

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_marginTop="8dp">

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

        <TextView
            android:id="@+id/textTitle"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:textStyle="bold"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="Title" />

        <TextView
            android:id="@+id/textTime"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:textStyle="normal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textTitle"
            tools:text="Time" />


        <ImageView
            android:id="@+id/imageNews"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textTime"
            app:layout_constraintBottom_toTopOf="@+id/viewSeperator"
            app:srcCompat="@mipmap/ic_logo" />

        <TextView
            android:id="@+id/textBody"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:textStyle="normal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/viewSeperator"
            app:layout_constraintTop_toBottomOf="@+id/imageNews"
            tools:text="Body" />

        <View
            android:id="@+id/viewSeperator"
            android:layout_width="0dp"
            android:layout_height="1px"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/buttonMore"/>

        <Button
            android:id="@+id/buttonMore"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintRight_toLeftOf="@+id/buttonShare"
            tools:text="readmore" />

        <Button
            android:id="@+id/buttonShare"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:text="share_button"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"/>
    </android.support.constraint.ConstraintLayout>

</LinearLayout>

- Mehul Kabaria