你可以用ConstraintSet或ConstraintLayout在ConstraintLayout中创建约束。LayoutParams属性。

为了方便使用，我创建了一个ConstraintSet kotlin扩展。 这是简单而健壮的。

使用

 applyConstraint {
            centerHorizontallyParent(imageView)
            centerHorizontallyParent(textView)
            topToParent(imageView, px(12))
            topToBottom(textView, imageView, px(4))
        }

Code

fun ConstraintLayout.applyConstraint(block: ConstraintSet.() -> Unit) {
    ConstraintSet().apply {
        clone(this@applyConstraint)
        block(this)
    }.applyTo(this)
}

fun ConstraintSet.centerParent(v1: View) {
    centerHorizontallyParent(v1)
    centerVerticallyParent(v1)
}

fun ConstraintSet.centerHorizontallyParent(v1: View) {
    centerHorizontally(v1.id, PARENT_ID)
}

fun ConstraintSet.centerVerticallyParent(v1: View) {
    centerVertically(v1.id, PARENT_ID)
}

fun ConstraintSet.topToTop(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, TOP, v2.id, TOP, margin)
}

fun ConstraintSet.topToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, TOP, PARENT_ID, TOP, margin)
}

fun ConstraintSet.bottomToBottom(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, BOTTOM, v2.id, BOTTOM, margin)
}

fun ConstraintSet.bottomToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, BOTTOM, PARENT_ID, BOTTOM, margin)
}

fun ConstraintSet.topToBottom(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, TOP, v2.id, BOTTOM, margin)
}

fun ConstraintSet.bottomToTop(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, BOTTOM, v2.id, TOP, margin)
}

fun ConstraintSet.startToStart(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, START, v2.id, START, margin)
}

fun ConstraintSet.startToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, START, PARENT_ID, START, margin)
}

fun ConstraintSet.endToEnd(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, END, v2.id, END, margin)
}

fun ConstraintSet.endToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, END, PARENT_ID, END, margin)
}

fun ConstraintSet.startToEnd(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, START, v2.id, END, margin)
}

fun ConstraintSet.endToStart(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, END, v2.id, START, margin)
}

例如:

app:layout_constraintRight_toRightOf = "parentView"

如果你喜欢用程序声明它，它将是…

ConstraintLayout.LayoutParams.rightToRight = parentView.getId()

如果你使用程序来声明parentview(viewgroup)，不要忘记给parentview一个生成的id。

parentView.setId(View.generatedId());

除了azizbekian的回答，让我指出两件事:

如果左/右都不行，试着这样开始/结束:

参数个数。startToEnd = button2.id

如果你想移除一个约束，使用UNSET标志，像这样:

参数个数。startToEnd = ConstraintLayout.LayoutParams.UNSET

@vishakha yeolekar的解决方案对我不起作用。

要更改约束，我们需要遵循以下步骤:

克隆父布局 清除先前的约束 连接约束 将约束应用到父布局

解决方案代码(Kotlin)

val clParent = findViewById<ConstraintLayout>(R.id.parent_layout)
val mConstraintSet = ConstraintSet()
mConstraintSet.clone(clParent)
mConstraintSet.clear(R.id.imageView, ConstraintSet.END)
mConstraintSet.connect(R.id.imageView, ConstraintSet.END, R.id.check_answer, ConstraintSet.END)
mConstraintSet.applyTo(clParent)

这里是ConstraintSet的更多信息和方法的链接-点击这里。

你可以用ConstraintSet或ConstraintLayout在ConstraintLayout中创建约束。LayoutParams属性。

为了方便使用，我创建了一个ConstraintSet kotlin扩展。 这是简单而健壮的。

使用

 applyConstraint {
            centerHorizontallyParent(imageView)
            centerHorizontallyParent(textView)
            topToParent(imageView, px(12))
            topToBottom(textView, imageView, px(4))
        }

Code

fun ConstraintLayout.applyConstraint(block: ConstraintSet.() -> Unit) {
    ConstraintSet().apply {
        clone(this@applyConstraint)
        block(this)
    }.applyTo(this)
}

fun ConstraintSet.centerParent(v1: View) {
    centerHorizontallyParent(v1)
    centerVerticallyParent(v1)
}

fun ConstraintSet.centerHorizontallyParent(v1: View) {
    centerHorizontally(v1.id, PARENT_ID)
}

fun ConstraintSet.centerVerticallyParent(v1: View) {
    centerVertically(v1.id, PARENT_ID)
}

fun ConstraintSet.topToTop(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, TOP, v2.id, TOP, margin)
}

fun ConstraintSet.topToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, TOP, PARENT_ID, TOP, margin)
}

fun ConstraintSet.bottomToBottom(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, BOTTOM, v2.id, BOTTOM, margin)
}

fun ConstraintSet.bottomToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, BOTTOM, PARENT_ID, BOTTOM, margin)
}

fun ConstraintSet.topToBottom(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, TOP, v2.id, BOTTOM, margin)
}

fun ConstraintSet.bottomToTop(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, BOTTOM, v2.id, TOP, margin)
}

fun ConstraintSet.startToStart(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, START, v2.id, START, margin)
}

fun ConstraintSet.startToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, START, PARENT_ID, START, margin)
}

fun ConstraintSet.endToEnd(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, END, v2.id, END, margin)
}

fun ConstraintSet.endToParent(v1: View, @Px margin: Int = 0) {
    connect(v1.id, END, PARENT_ID, END, margin)
}

fun ConstraintSet.startToEnd(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, START, v2.id, END, margin)
}

fun ConstraintSet.endToStart(v1: View, v2: View, @Px margin: Int = 0) {
    connect(v1.id, END, v2.id, START, margin)
}

To set constraints of image view to: app:layout_constraintRight_toRightOf="@+id/check_answer1" app:layout_constraintTop_toTopOf="@+id/check_answer1" use: ConstraintLayout constraintLayout = findViewById(R.id.parent_layout); ConstraintSet constraintSet = new ConstraintSet(); constraintSet.clone(constraintLayout); constraintSet.connect(R.id.imageView,ConstraintSet.RIGHT,R.id.check_answer1,ConstraintSet.RIGHT,0); constraintSet.connect(R.id.imageView,ConstraintSet.TOP,R.id.check_answer1,ConstraintSet.TOP,0); constraintSet.applyTo(constraintLayout); To set constraints of image view to: app:layout_constraintRight_toRightOf="@+id/check_answer2" app:layout_constraintTop_toTopOf="@+id/check_answer2" use: ConstraintLayout constraintLayout = findViewById(R.id.parent_layout); ConstraintSet constraintSet = new ConstraintSet(); constraintSet.clone(constraintLayout); constraintSet.connect(R.id.imageView,ConstraintSet.RIGHT,R.id.check_answer2,ConstraintSet.RIGHT,0); constraintSet.connect(R.id.imageView,ConstraintSet.TOP,R.id.check_answer2,ConstraintSet.TOP,0); constraintSet.applyTo(constraintLayout);