![](/img/trans.png)
[英]ConstraintLayout, when constraint dependent view is gone, the layout view behave weirdly
[英]keep the margin when the referenced view is gone in ConstraintLayout
我有 2 個 TextView,如下面的 xml 所示。 如果我在運行時隱藏textView2
,我將失去底部邊距。 當textView2
消失時,如何將textView
和父級之間的底部邊距保持為 16dp。
<?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="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="abc"
app:layout_constraintBottom_toTopOf="@+id/textView2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed"
/>
<TextView
android:id="@+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="xyz"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
app:layout_constraintVertical_chainStyle="packed"/>
</android.support.constraint.ConstraintLayout>
使用layout_goneMarginBottom
:
<?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="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="abc"
app:layout_goneMarginBottom="16dp"
app:layout_constraintBottom_toTopOf="@+id/textView2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed"
/>
<TextView
android:id="@+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="xyz"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
app:layout_constraintVertical_chainStyle="packed"/>
</android.support.constraint.ConstraintLayout>
下面的例子有助於理解這個概念
以下是text3的約束
app:layout_goneMarginStart="100dp"
app:layout_constraintStart_toEndOf="@id/text2"
android:layout_marginStart="10dp"
因為我們已經為 text3 設置了 text2 的開始約束
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.