ConstraintLayout和加权链问题

时间:2018-05-11 14:00:33

标签: android android-constraintlayout

我正在构建一个包含6个链元素的简单纵向布局:

  • 2 x Spaces
  • 4 x视图(实际上它们是一个更复杂的视图,但问题也可以在空视图中重现)

我的目标是:   - 空间必须占父母身高的10%(每人5%)   - 观看次数必须占父母身高的90%(每次22.5%)

为了达到这个目的,我使用layout_constraintVertical_weight

问题是当 weight_sum = 10 时,所有视图都会消失,相反,当sum与10不同时(例如9,9),它可以正常工作。我已经使用了加权视图(使用LinearLayout),但我从未发现过这个问题...

版本:

Android Studio 3.1.2

implementation 'com.android.support.constraint:constraint-layout:1.1.0'

有什么想法吗?! 谢谢:))

<?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">

<Space
    android:id="@+id/space"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintBottom_toTopOf="@+id/view1"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_weight="0.5" />

<View
    android:id="@+id/view1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/blue"
    app:layout_constraintBottom_toTopOf="@+id/view2"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/space"
    app:layout_constraintVertical_weight="2.25" />

<View
    android:id="@+id/view2"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/yellow"
    app:layout_constraintBottom_toTopOf="@+id/view3"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/view1"
    app:layout_constraintVertical_weight="2.25" />

<View
    android:id="@+id/view3"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/green"
    app:layout_constraintBottom_toTopOf="@+id/view4"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/view2"
    app:layout_constraintVertical_weight="2.25" />

<View
    android:id="@+id/view4"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/red"
    app:layout_constraintBottom_toTopOf="@+id/space2"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/view3"
    app:layout_constraintVertical_weight="2.25" />

<View
    android:id="@+id/space2"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/view4"
    app:layout_constraintVertical_weight="0.5" />

</android.support.constraint.ConstraintLayout>`

Screen with sum 9,9

Screen with sum 10

差异只是 space2

layout_constraintVertical_weight
<View
    android:id="@+id/space2"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/view4"
    app:layout_constraintVertical_weight="0.49" />

0 个答案:

没有答案