Android:如何以编程方式设置 layout_constraintRight_toRightOf “parent" [英] Android : How to programmatically set layout_constraintRight_toRightOf "parent"

问题描述

我在 ConstrainLayout 中有一个视图，如下所示.

I have a view in ConstrainLayout as follows.

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxWidth="260dp"
        android:textColor="#FFF"
        android:textSize="16sp"
        app:layout_constraintLeft_toLeftOf="@+id/parent"
        app:layout_constraintTop_toBottomOf="@id/message_date"
        android:id="@+id/text_main"
        />

我想在 recycleViewHolder 中以编程方式将视图更改为 app:layout_constraintLeft_toLeftOf="@+id/parent" 或 layout_constraintLeft_toRightOf="@+id/parent"基于某些条件.

I would like to change the view to either app:layout_constraintLeft_toLeftOf="@+id/parent" or layout_constraintLeft_toRightOf="@+id/parent" programmatically in recycleViewHolder based on some conditions.

推荐答案

下面是一个使用java代码在父视图底部设置按钮的例子:

Here is an example of setting a button to the bottom of parent view using java code:

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);

}

要实现这样的目标，

app:layout_constraintLeft_toLeftOf="@+id/parent" 

你的java代码应该是这样的

your java code should look like this

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

为了实现这样的目标，

layout_constraintLeft_toRightOf="@+id/parent"

你的java代码应该是这样的，

your java code should look like this,

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

这里，我假设 android:id="@+id/parent" 是你的父 ConstraintLayout 的 ID.

Here, I'm assuming android:id="@+id/parent" is the id of your parent ConstraintLayout .

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