动画Android视图以更改其位置和尺寸

Question

您能否建议如何在Android中制作视图动画以更改其位置，宽度，高度，边距等。我已经附加了3张视图（颜色 - 黄色，蓝色，橙色）的图片在视图组（绿色）中，视图组的总数为3.想法是 - 当＆＃34; Animate按钮＆＃34;单击位置，视图组及其内部视图的尺寸应使用动画更改。紫色箭头显示了两种动画方向。

Answer 1

可以使用ConstraintLayouts和ConstraintSet动画来实现，例如： 的 layout_1.xml

<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:id="@+id/layout_1"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
    android:id="@+id/button1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:background="@android:color/holo_red_dark"
    android:text="View1"
    app:layout_constraintEnd_toStartOf="@+id/button2"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button2"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    android:background="@android:color/holo_red_dark"
    android:text="View2"
    app:layout_constraintBottom_toBottomOf="@+id/button1"
    app:layout_constraintEnd_toStartOf="@+id/button3"
    app:layout_constraintStart_toEndOf="@+id/button1"
    app:layout_constraintTop_toTopOf="@+id/button1" />

<Button
    android:id="@+id/button3"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    android:background="@android:color/holo_red_dark"
    android:text="View3"
    app:layout_constraintBottom_toBottomOf="@+id/button2"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/button2"
    app:layout_constraintTop_toTopOf="@+id/button2" />

<Button
    android:id="@+id/animateButton"
    android:layout_width="88dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.88"
    app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

layout_2.xml：

<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"
tools:context=".MainActivity">

<Button
    android:id="@+id/button1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="32dp"
    android:layout_marginEnd="8dp"
    android:background="@android:color/holo_red_dark"
    android:text="View1"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button2"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:background="@android:color/holo_red_dark"
    android:text="View2"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/button1" />

<Button
    android:id="@+id/button3"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:background="@android:color/holo_red_dark"
    android:text="View3"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/button2" />


<Button
    android:id="@+id/animateButton"
    android:layout_width="88dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.88"
    app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

并在animateButton上添加：

 private fun addAnimation() {
    var set = false
    val constraint1 = ConstraintSet()
    constraint1.clone(root)
    val constraint2 = ConstraintSet()
    constraint2.clone(this, R.layout.layout_2)

    findViewById<Button>(R.id.animateButton).setOnClickListener {
        TransitionManager.beginDelayedTransition(root)
        val constraint = if (set) constraint1 else constraint2
        constraint.applyTo(root)
        set = !set
    }
}

当我们将新的ConstraintSet应用于相同的布局时，ConstraintLayout将找到具有相同android：id的元素的约束更改，并将正确设置动画。 当然，如果您不想复制布局文件，可以以编程方式更改项目的约束。