[英]How can put my title at top of the ImageView - Android Studio
I want to put my Title at top of the ImageView.我想把我的标题放在 ImageView 的顶部。 However, I can not use layout_above to put my title at the top.
但是,我不能使用 layout_above 将我的标题放在顶部。 When I trying this my text is invisible.
当我尝试这个时,我的文字是不可见的。 The title in the last image is exactly the alignment I want.
最后一张图片中的标题正是我想要的对齐方式。 How can I do that ?
我怎样才能做到这一点 ?
Actual:实际的:
Expected:预期的:
You don't need to wrap ImageView
and TextView
in another RelativeLayout
.您不需要将
ImageView
和TextView
包装在另一个RelativeLayout
。 It's actually easier and more performant to put them both directly in ConstraintLayout
.将它们直接放在
ConstraintLayout
实际上更容易、更ConstraintLayout
。 Then it's only a question of setting the constraints correctly.那么这只是正确设置约束的问题。 Demo code:
演示代码:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<TextView
android:id="@+id/above"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Title above"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="@id/image"
app:layout_constraintEnd_toEndOf="@id/image"/>
<ImageView
android:id="@+id/image"
android:layout_width="400px"
android:layout_height="400px"
android:src="@color/purple_200"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/above"/>
<TextView
android:id="@+id/overlay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text overlay"
app:layout_constraintStart_toStartOf="@id/image"
app:layout_constraintTop_toTopOf="@id/image"/>
</androidx.constraintlayout.widget.ConstraintLayout>
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