android - 如何通过代码将 ImageView 设置在布局的中心？

Question

接下来试试

LinearLayout.LayoutParams b = new LinearLayout.LayoutParams(
                        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                b.gravity =Gravity.CENTER;

                ivOne.setLayoutParams(b);

但这不起作用，布局左侧的 ImageView

Answer 1

尝试将父布局更改为 RelativeLayout ，并使用属性 centerInParent :

RelativeLayout rootLayout = new RelativeLayout(this);
rootLayout.setLayoutParams( new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
ImageView ivOne = new ImageView(this);
ivOne.setImageResource(R.drawable.ic_launcher);
ivOne.setScaleType(ImageView.ScaleType.CENTER);
ivOne.setLayoutParams(params);
//TODO : add other views 
rootLayout.addView(ivOne);