Android:如何以编程方式设置layout_constraintRight_toRightOf"parent"

我在ConstrainLayout中有一个视图如下.

我想根据某些条件将视图更改为app:layout_constraintLeft_toLeftOf="@+id/parent"或layout_constraintLeft_toRightOf="@+id/parent"在recycleViewHolder中以编程方式.

以下是使用java代码将按钮设置到父视图底部的示例:

ConstraintLayout constraintLayout;
ConstraintSet constraintSet;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    constraintLayout = (ConstraintLayout) findViewById(R.id.activity_main_constraint_layout);

    Button button = new Button(this);
    button.setText("Hello");
    constraintLayout.addView(button);

    constraintSet = new ConstraintSet();
    constraintSet.clone(constraintLayout);

    constraintSet.connect(button.getId(), ConstraintSet.LEFT, constraintLayout.getId(), ConstraintSet.RIGHT, 0);
    constraintSet.constrainDefaultHeight(button.getId(), 200);
    constraintSet.applyTo(constraintLayout);

}

实现这样的目标,

app:layout_constraintLeft_toLeftOf="@+id/parent" 

你的java代码应该是这样的

set.connect(YOURVIEW.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.LEFT,0);

并实现这样的目标,

layout_constraintLeft_toRightOf="@+id/parent"

你的java代码应该是这样的,

set.connect(YOURVIEW.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,0);

在这里,我假设android:id="@+id/parent"是您的父ConstraintLayout的id.