如何在 android 约束布局中半重叠图像

Question

有没有办法仅使用约束布局将图像的一半放置在另一图像之上。我知道它可以使用相对布局和框架布局来完成，但是在约束布局的情况下还是有吗？更喜欢不需要 heights/widths

任何硬编码的方式

要求如下所示

Answer 1

试试这个

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/my_imageView"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@color/colorAccent" />

    <android.support.v4.widget.Space
        android:id="@+id/marginSpacer"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="30dp"
        app:layout_constraintBottom_toBottomOf="@+id/my_imageView"
        app:layout_constraintLeft_toLeftOf="@id/my_imageView"
        app:layout_constraintRight_toRightOf="@id/my_imageView" />

    <ImageView
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@color/colorPrimary"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/marginSpacer" />

</android.support.constraint.ConstraintLayout>

输出

或这个

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

        <LinearLayout
            android:id="@+id/imageviewanchor"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/subject"
                android:layout_width="match_parent"
                android:layout_height="250dp"
                android:src="@color/colorAccent"
                android:text="Thi"
                android:textSize="17sp" />

        </LinearLayout>

        <LinearLayout
            android:id="@+id/viewB"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/white"
            android:orientation="horizontal">

        </LinearLayout>

    </LinearLayout>

    <ImageView
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:clickable="true"
        android:src="@color/colorPrimary"
        app:layout_anchor="@+id/imageviewanchor"
        app:layout_anchorGravity="bottom|center" />

</android.support.design.widget.CoordinatorLayout>

输出

Answer 2

检查保证金。把它放在你的 ConstraintLayout 中。

  <android.support.constraint.Guideline
     android:id="@+id/guideline"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:orientation="horizontal"
     app:layout_constraintGuide_percent="0.5" />
  <LinearLayout
     android:layout_width="0dp"
     android:layout_height="0dp"
     android:background="@color/colorPrimary"
     app:layout_constraintLeft_toLeftOf="parent"
     app:layout_constraintRight_toRightOf="parent"
     app:layout_constraintTop_toTopOf="parent"
     app:layout_constraintBottom_toTopOf="@+id/guideline"/>

 <LinearLayout
     android:layout_width="0dp"
     android:layout_height="0dp"
     android:background="@color/colorAccent"
     app:layout_constraintLeft_toLeftOf="parent"
     app:layout_constraintRight_toRightOf="parent"
     app:layout_constraintBottom_toBottomOf="parent"
     app:layout_constraintTop_toBottomOf="@+id/guideline"/>
 <ImageView
     android:layout_width="100dp"
     android:layout_height="100dp"
     android:layout_marginBottom="8dp"
     android:layout_marginEnd="8dp"
     android:layout_marginStart="8dp"
     android:layout_marginTop="8dp"
     android:src="#000000"
     app:layout_constraintBottom_toBottomOf="parent"
     app:layout_constraintEnd_toEndOf="parent"
     app:layout_constraintStart_toStartOf="parent"
     app:layout_constraintTop_toTopOf="parent" />

Answer 3

您可以仅使用约束布局来设置布局，如下所示：

<?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">

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@android:color/holo_orange_dark"
        app:layout_constraintBottom_toTopOf="@id/guideline"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline"
        android:layout_width="0dp"  
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5" />

    <ImageView
        android:id="@+id/imageView_upper"
        android:layout_width="70dp"
        android:layout_height="70dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@id/guideline"
        app:layout_constraintBottom_toBottomOf="@id/guideline"
        android:background="@android:color/holo_purple"/>

</android.support.constraint.ConstraintLayout>

注意：如果你使用的是androidx那么你必须使用androidx.constraintlayout.widget.ConstraintLayout而不是android.support.constraint.ConstraintLayout

Answer 4

最简单的方法

<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"
    android:fitsSystemWindows="true"
    >

    <ImageView
        android:id="@+id/appBar"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:background="#c2b6c2">

    </ImageView>


    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatbtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:src="@drawable/ic_menu_camera"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="@+id/appBar"
        app:layout_constraintTop_toBottomOf="@+id/appBar"
         />
</android.support.constraint.ConstraintLayout>

Answer 5

  <?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:weightSum="2"
                        android:orientation="vertical"
                        >
                        <RelativeLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_weight="1.2"
                            >
                            <LinearLayout
                                android:layout_width="match_parent"
                                android:layout_height="match_parent"
                                android:weightSum="2"
                                android:orientation="vertical"
                                >
                            <LinearLayout
                                android:layout_width="match_parent"
                                android:layout_height="match_parent"
                                android:background="@drawable/bg"
                                android:layout_weight="1"
                                >
                            </LinearLayout>
                            <LinearLayout
                                android:layout_width="match_parent"
                                android:layout_height="match_parent"
                                android:layout_weight="1"
                                android:layout_below="@+id/laytop"
                                >
                            </LinearLayout>
                            </LinearLayout>
                           <ImageView
                               android:layout_width="wrap_content"
                               android:layout_height="wrap_content"
                               android:background="@drawable/placeholder"
                               android:layout_centerInParent="true"
                               >

                           </ImageView>
                        </RelativeLayout>
                        <LinearLayout
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_weight="0.8"
                            >

                        </LinearLayout>
                    </LinearLayout>

如何在 android 约束布局中半重叠图像

How to half overlap images in android constraint layout

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