java - 如何将线性布局(作为子级)动态添加到约束布局(父级)？

Question

我定义了一种创建线性布局并将其添加到父布局的方法。但它没有用。我想我弄错了。

    public void methodName() {
        LinearLayout linearLayout = new LinearLayout(MainActivity.this);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
        linearLayout.setLayoutParams(params);
        linearLayout.setOrientation(LinearLayout.HORIZONTAL);
        linearLayout.setBackgroundColor(Color.RED);
        ConstraintLayout main = (ConstraintLayout) findViewById(R.id.mainLayout);
        main.addView(linearLayout);
   }

Answer 1

要将 View 添加到 ConstraintLayout，您必须使用 ConstraintSet 添加约束。

在约束布局中添加动态 View 时，它与其他布局有点不同。您还需要像下面这样指定约束:-

     ConstraintLayout main = (ConstraintLayout) findViewById(R.id.mainLayout);
     ConstraintSet set = new ConstraintSet();

     LinearLayout linearLayout = new LinearLayout(MainActivity.this);
     LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
     linearLayout.setLayoutParams(params);
     linearLayout.setOrientation(LinearLayout.HORIZONTAL);
     linearLayout.setBackgroundColor(Color.RED);
     main.addView(linearLayout,0);
     set.clone(main);
     set.connect(linearLayout.getId(), ConstraintSet.TOP, main.getId(), ConstraintSet.TOP, 60);
     set.applyTo(main);