我定义了一种创建线性布局并将其添加到父布局中的方法。但这无效。我想我犯了错误。
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);
}
要将视图添加到约束layout,您必须使用约束集添加约束。
在约束布局中添加动态视图时,它与其他布局有些不同。您需要在下面指定约束以及类似的约束: -
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);