Android ConstraintLayout：layout_constraintDimensionRatio不起作用

时间：2017-05-26 13:03:39

标签： android android-constraintlayout

所以我试图创建一个包含ScrollView的视图。 ScrollView包含2列4 ImageButton。我希望ImageButton始终是正方形，所以我使用 layout_constraintDimensionRatio = 1：1 。我也在使用 layout_constraintHorizo​​ntal_weight = 0.5 ，这样每个ImageButton应该是50％宽

然而，每个方块都显示100％宽？

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1 个答案:

答案 0 :(得分：1)

更改图像按钮right2，right3和right4，将其顶部分别约束为left2，left3和left4。对于right2来说就像这样：

app:layout_constraintTop_toTopOf="@id/left2"

另外，从left1中删除以下行。我认为这只是一个错误。

app:layout_constraintBottom_toTopOf="@+id/left2"

这将为您提供类似this demo的显示。

我没有回答为什么这样做。如果其他读者知道，我肯定希望听到答案。这是XML：

更改了XML 

<?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:id="@+id/activity_form"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorAccent">

    <ScrollView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="0dp"
        android:layout_marginLeft="24dp"
        android:layout_marginRight="24dp"
        android:layout_marginTop="0dp"
        android:background="@color/colorPrimary"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0">

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

            <TextView
                android:id="@+id/title1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="Your story starts here"
                android:textColor="#ffffff"
                android:textSize="20sp"
                app:layout_constraintHorizontal_bias="0.0"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toTopOf="parent" />

            <EditText
                android:id="@+id/editText"
                android:layout_width="300px"
                android:layout_height="wrap_content"
                android:layout_marginLeft="0dp"
                android:layout_marginTop="16dp"
                android:background="@android:color/background_light"
                android:inputType="textPersonName"
                android:padding="5dp"
                android:text="Name"
                app:layout_constraintHorizontal_bias="0.0"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toBottomOf="@+id/title1" />

            <TextView
                android:id="@+id/title2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="Choose what matters to you"
                android:textColor="#ffffff"
                android:textSize="20sp"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <ImageButton
                android:id="@+id/left1"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right1"
                app:layout_constraintTop_toBottomOf="@+id/title2"
                app:srcCompat="@color/colorAccent" />

            <ImageButton
                android:id="@+id/right1"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/right2"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left1"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toBottomOf="@+id/title2"
                app:srcCompat="@android:color/holo_orange_dark" />

            <ImageButton
                android:id="@+id/left2"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/left3"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right2"
                app:layout_constraintTop_toBottomOf="@id/left1"
                app:srcCompat="@color/colorPrimaryDark" />

            <ImageButton
                android:id="@+id/right2"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/right3"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left2"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toTopOf="@id/left2"
                app:srcCompat="@android:color/holo_red_light" />

            <ImageButton
                android:id="@+id/left3"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/left4"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right3"
                app:layout_constraintTop_toBottomOf="@id/left2"
                app:srcCompat="@android:color/holo_green_light" />

            <ImageButton
                android:id="@+id/right3"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/right4"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left3"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toTopOf="@id/left3"
                app:srcCompat="@android:color/holo_blue_bright" />

            <ImageButton
                android:id="@+id/left4"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/button"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left_main_guideline"
                app:layout_constraintRight_toLeftOf="@+id/right4"
                app:layout_constraintTop_toBottomOf="@id/left3"
                app:srcCompat="@android:color/holo_blue_dark" />

            <ImageButton
                android:id="@+id/right4"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:padding="0dp"
                app:layout_constraintBottom_toTopOf="@+id/button"
                app:layout_constraintDimensionRatio="1:1"
                app:layout_constraintHorizontal_weight="0.5"
                app:layout_constraintLeft_toRightOf="@+id/left4"
                app:layout_constraintRight_toLeftOf="@+id/right_main_guideline"
                app:layout_constraintTop_toTopOf="@id/left4"
                app:srcCompat="?attr/colorControlHighlight" />

            <Button
                android:id="@+id/button"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom"
                android:text="See your O2 Home Story"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent" />

            <android.support.constraint.Guideline
                android:id="@+id/left_main_guideline"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                app:layout_constraintGuide_percent="0.0"
                tools:layout_editor_absoluteX="0dp"
                tools:layout_editor_absoluteY="0dp" />

            <android.support.constraint.Guideline
                android:id="@+id/right_main_guideline"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                app:layout_constraintGuide_percent="1.0"
                tools:layout_editor_absoluteX="360dp"
                tools:layout_editor_absoluteY="0dp" />

        </android.support.constraint.ConstraintLayout>

    </ScrollView>
</android.support.constraint.ConstraintLayout>
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