我在 xml 中有以下代码片段。它只是显示 3 种不同的视图。但在运行时我想改变对齐方式。但是,textviewShopNow 应在父端对齐。但似乎还有差距。我似乎找不到解决方案。 该片段包含在以下层次结构中
<androidx.constraintlayout.widget.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/layoutContent"
android:layout_width="match_parent"
android:layout_height="@dimen/home_banner_without_promo_height"
android:layout_marginBottom="@dimen/margin_12dp">
其他观点请看这里
<com.google.android.material.textview.MaterialTextView
android:id="@+id/textViewProductTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/margin_16dp"
android:includeFontPadding="false"
android:lineSpacingExtra="@dimen/home_banner_promo_line_spacing_extra_product_title"
android:textSize="@dimen/home_banner_product_title_text_size"
app:fontFamily="@font/central_sang_bleu_medium"
app:layout_constraintBottom_toTopOf="@+id/textViewSubHeading"
app:layout_constraintStart_toStartOf="parent"
app:textAllCaps="true"
tools:text="ESTEE LAUDER"
tools:textColor="@color/white" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/textViewShopNow"
style="@style/HeroBannerIButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/margin_8dp"
android:layout_marginHorizontal="@dimen/margin_16dp"
app:layout_constraintBottom_toBottomOf="@+id/textViewSubHeading"
app:layout_constraintEnd_toEndOf="parent"
tools:text="@string/shop_now"
tools:textColor="@color/white" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/textViewSubHeading"
android:layout_width="@dimen/margin_0dp"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/margin_16dp"
android:layout_marginBottom="@dimen/margin_18dp"
android:textSize="@dimen/home_banner_sub_heading_text_size"
android:textStyle="bold"
app:fontFamily="@font/cpn_regular"
app:layout_constraintBottom_toTopOf="@id/promoCarousel"
app:layout_constraintEnd_toStartOf="@+id/textViewShopNow"
app:layout_constraintStart_toStartOf="parent"
app:layout_goneMarginEnd="@dimen/margin_16dp"
app:lineHeight="15dp"
tools:visibility="visible"
tools:text="@string/home_banner_sub_heading_text"
tools:textColor="@color/white" />
在我的代码中,我设置约束集如下:
textViewSubHeading.isGone = true
val constraintSet = ConstraintSet()
constraintSet.connect(textViewShopNow.id, ConstraintSet.START, textViewProductTitle.id, ConstraintSet.END, 4)
constraintSet.connect(textViewShopNow.id, ConstraintSet.BOTTOM, textViewProductTitle.id, ConstraintSet.BOTTOM)
constraintSet.connect(textViewShopNow.id, ConstraintSet.END, ConstraintSet.PARENT_ID, ConstraintSet.END, 0)
constraintSet.constrainHeight(textViewShopNow.id, ConstraintSet.WRAP_CONTENT)
constraintSet.constrainWidth(textViewShopNow.id, ConstraintSet.WRAP_CONTENT)
constraintSet.applyTo(layoutContent)
layoutContent.requestLayout()
如下图所示。 WebLink 是 textViewShopNow,但它与父级的 End 不对齐。
您应该首先克隆
layoutContent
的约束,然后向该集合应用附加约束。
另外,requestLayout 应该不是必需的。
最终结果将是:
val constraintSet = ConstraintSet()
constraintSet.clone(layoutContent)
constraintSet.connect(textViewShopNow.id, ConstraintSet.START, textViewProductTitle.id, ConstraintSet.END, 4)
constraintSet.connect(textViewShopNow.id, ConstraintSet.BOTTOM, textViewProductTitle.id, ConstraintSet.BOTTOM)
constraintSet.connect(textViewShopNow.id, ConstraintSet.END, ConstraintSet.PARENT_ID, ConstraintSet.END, 0)
constraintSet.connect(textViewProductTitle.id, ConstraintSet.END, textViewShopNow.id, ConstraintSet.START, 0)
constraintSet.constrainHeight(textViewShopNow.id, ConstraintSet.WRAP_CONTENT)
constraintSet.constrainWidth(textViewShopNow.id, ConstraintSet.WRAP_CONTENT)
constraintSet.applyTo(layoutContent)