我定义了一个方法来创建线性布局并将其添加到父布局中,但是它没有起作用。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);
}