android - (Android) 将进度条放置在 View 之上

Question

我想将 ProgressBar 放在 View 的前面(顶部)。这是我的 xml 文件，进度条当前位于后面，被 View 覆盖

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity">

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:indeterminateOnly="false"
        android:progressDrawable="@drawable/percentage_circle"
        app:layout_constraintWidth_percent="0.6"
        app:layout_constraintHeight_percent="0.36"
        app:layout_constraintStart_toStartOf="@+id/view2"
        app:layout_constraintTop_toTopOf="@+id/view2" />

    <View
        android:id="@+id/view2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/rounded_rec"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.6"
        app:layout_constraintStart_toStartOf="parent" />

    <View
        android:id="@+id/view3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/rounded_rec"
        app:layout_constraintHeight_percent="0.4"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_percent="0.6" />

    <View
        android:id="@+id/view4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/rounded_rec"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.4"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_percent="0.4" />

</androidx.constraintlayout.widget.ConstraintLayout>

我想知道有哪些可能的方法可以将进度条置于最前面。这些解决方案也适用于其他对象(EditText、TextView...)吗？

Answer 1

您正在使用ConstraintLayout。在 ConstraintLayout 中，与 RelativeLayout 或 LinearLayout 不同，在前一个 View 之后声明的 View 放置在前一个 View 的上方，这意味着最后声明的 View 将位于顶部。因此，只需将 ProgressBar 移动到底部，如下所示:

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity">

    <View
        android:id="@+id/view2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/rounded_rec"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.6"
        app:layout_constraintStart_toStartOf="parent" />

    <View
        android:id="@+id/view3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/rounded_rec"
        app:layout_constraintHeight_percent="0.4"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_percent="0.6" />

    <View
        android:id="@+id/view4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/rounded_rec"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.4"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_percent="0.4" />

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:indeterminateOnly="false"
        android:progressDrawable="@drawable/percentage_circle"
        app:layout_constraintWidth_percent="0.6"
        app:layout_constraintHeight_percent="0.36"
        app:layout_constraintStart_toStartOf="@+id/view2"
        app:layout_constraintTop_toTopOf="@+id/view2" />

</androidx.constraintlayout.widget.ConstraintLayout>