在约束布局中添加视图并以编程方式将它们设置为全屏

Question

我花了几个小时在 ConstraintLayout 中添加图像视图并将其设置为全屏大小。

这是我在约束布局中添加图像的实际代码：

final ConstraintLayout constraitLayout = (ConstraintLayout)activity.findViewById(layout_xml);
    constraitLayout.addView(mImage,0);
    ConstraintSet set1 = new ConstraintSet();
    set1.clone(constraitLayout);
    set1.connect(mImage.getId(), ConstraintSet.TOP, constraitLayout.getId(), ConstraintSet.TOP, 0);
    set1.connect(mImage.getId(), ConstraintSet.LEFT, constraitLayout.getId(), ConstraintSet.LEFT, 0);
    set1.connect(mImage.getId(), ConstraintSet.RIGHT, constraitLayout.getId(), ConstraintSet.RIGHT, 0);
    set1.connect(mImage.getId(), ConstraintSet.BOTTOM, constraitLayout.getId(), ConstraintSet.BOTTOM, 0);
    set1.applyTo(constraitLayout);

感谢帮助！

Answer 1

问题是您没有为图像视图设置宽度和高度，因此默认情况下，两者都会采用wrap_content。因此将它们都设置为 0dp 将解决该问题。添加这些行将宽度和高度设置为 0dp。

 mImage.setLayoutParams(
            new LinearLayoutCompat.LayoutParams(
                    0,0));

另一件事，您可以使用 ConstraintSet.PARENT_ID，而不是通过 constraintLayout.getId() 获取父 id。所以最终代码看起来像

 mImage.setLayoutParams(
            new LinearLayoutCompat.LayoutParams(
                    0,0));
    constraitLayout.addView(mImage,0);
    ConstraintSet set1 = new ConstraintSet();
    set1.clone(constraitLayout);
    set1.connect(mImage.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP, 0);
    set1.connect(mImage.getId(), ConstraintSet.LEFT, ConstraintSet.PARENT_ID, ConstraintSet.LEFT, 0);
    set1.connect(mImage.getId(), ConstraintSet.RIGHT, ConstraintSet.PARENT_ID, ConstraintSet.RIGHT, 0);
    set1.connect(mImage.getId(), ConstraintSet.BOTTOM, ConstraintSet.PARENT_ID, ConstraintSet.BOTTOM, 0);
    set1.applyTo(constraitLayout);

希望这可以帮助