以编程方式设置Android的width约束布局百分比 [英] set percent width constraintlayout Android programmatically

问题描述

对于Android中的约束布局v1.1.x，我们可以将高度和宽度设置为百分比. 同样，需要以编程方式在Android中将视图的宽度和高度设置为百分比: 例如，此代码是用xml编写的，用于一些约束布局:

For constraint layout v1.1.x in Android we can set height and width as percentage. Similarly, need to set view width and height as percent in Android programmatically: for example, this code is written in xml for some constraint layout:

<!-- the widget will take 40% of the available space -->
    app:layout_constraintWidth_default="percent"
    app:layout_constraintWidth_percent="0.4"

在运行时执行的Java代码是什么?

what will be its java code for doing it runtime?

推荐答案

您需要使用ConstraintSet-参考

You need to use ConstraintSet - Reference

通过此类，您可以以编程方式定义一组约束，以与 ConstraintLayout 一起使用.它使您可以创建和保存约束，并将其应用于现有的ConstraintLayout. ConstraintsSet可以通过多种方式创建:

This class allows you to define programmatically a set of constraints to be used with ConstraintLayout. It lets you create and save constraints, and apply them to an existing ConstraintLayout. ConstraintsSet can be created in various ways:

mConstraintLayout = (ConstraintLayout) findViewById(R.id.myconstraint_layout)

ConstraintSet set = new ConstraintSet();

// Add constrains - Here R.id.myconstraint_layout is the Id of your constraint layout
set.constrainPercentHeight(R.id.myconstraint_layout, 0.4);
set.constrainPercentWidth(R.id.myconstraint_layout, 0.4);

// Apply the changes - mConstraintLayout is reference to the desired view
set.applyTo(mConstraintLayout); 

您可以在此集合上调用那些高度宽度百分比方法

You can call those height width percentage methods on this set

• constrainPercentHeight(int viewId，float百分比)
• constrainPercentWidth(int viewId，float百分比)

• constrainPercentHeight(int viewId, float percent)
• constrainPercentWidth(int viewId, float percent)

像这样将这些约束应用于您的约束布局

And apply those constraints to your Constraint Layout like this

set.applyTo(mConstraintLayout); 

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