Android ConstraintSet 不工作

Question

我的 XML 中有一个名为 rootLayout 的 ConstraintLayout。

我想让 radiogroup 居中，textview 放在它的顶部

这是我的代码:

                        ConstraintLayout.LayoutParams groupParam = new ConstraintLayout.LayoutParams(
                                ConstraintLayout.LayoutParams.WRAP_CONTENT, ConstraintLayout.LayoutParams.WRAP_CONTENT);

                        RadioGroup group = new RadioGroup(this);
                        group.setOrientation(RadioGroup.VERTICAL);
                        group.setLayoutParams(groupParam);

                        TextView titleTv = new TextView(this);
                        titleTv.setText(currentQuestion.titleEn);
                        titleTv.setLayoutParams(groupParam);

                        for (int i = 0; i < currentQuestion.listAnswers.size(); i++) {
                            RadioButton btn = new RadioButton(this);
                            btn.setText(currentQuestion.listAnswers.get(i).titleEn);
                            group.addView(btn);
                        }

                        rootLayout.addView(group);
                        rootLayout.addView(titleTv);

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

                        constraintSet.connect(group.getId(), ConstraintSet.TOP,
                                rootLayout.getId(), ConstraintSet.TOP, 0);
                        constraintSet.connect(group.getId(), ConstraintSet.BOTTOM,
                                rootLayout.getId(), ConstraintSet.BOTTOM, 0);
                        constraintSet.connect(group.getId(), ConstraintSet.LEFT,
                                rootLayout.getId(), ConstraintSet.LEFT, 0);
                        constraintSet.connect(group.getId(), ConstraintSet.RIGHT,
                                rootLayout.getId(), ConstraintSet.RIGHT, 0);

                        constraintSet.connect(titleTv.getId(), ConstraintSet.BOTTOM,
                                group.getId(), ConstraintSet.TOP, 70);
                        constraintSet.connect(titleTv.getId(), ConstraintSet.LEFT,
                                rootLayout.getId(), ConstraintSet.LEFT, 0);
                        constraintSet.connect(titleTv.getId(), ConstraintSet.RIGHT,
                                rootLayout.getId(), ConstraintSet.RIGHT, 0);

                        constraintSet.applyTo(rootLayout);

但是显示不正确。我使用 ConstraintSet 的方式有什么问题吗？

编辑:这是它的样子

Answer 1

我有同样的问题，添加constraintHeight解决了问题

                    constraintSet.constrainHeight(titleTv.getId(),
                            ConstraintSet.WRAP_CONTENT);
                    constraintSet.constrainWidth(titleTv.getId(),
                            ConstraintSet.WRAP_CONTENT);