在ConstraintLayout中以编程方式删除/添加约束 [英] Removing/Adding constraint programmatically in ConstraintLayout
本文介绍了在ConstraintLayout中以编程方式删除/添加约束的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想根据某些条件以编程方式删除和添加约束.这是屏幕截图:
I want to remove and add constraint programmatically based on some condition. Here are the screenshots:
并且我想这样删除它,但是在代码中:
and I want to remove it like this but in code:
所以想要通过编程实现相同的效果
so the same effect in want to achieve programmatically
这是我尝试的代码:
if (advertisements.size() > 0) { //my own condition
ConstraintLayout.LayoutParams layoutParams = (ConstraintLayout.LayoutParams) btnCreateAd.getLayoutParams();
layoutParams.topToBottom = R.id.imvEmpty; //the imageview that is in center of the view
btnCreateAd.setLayoutParams(layoutParams);
recyclerView.setVisibility(View.VISIBLE);
txvMyAdEmptyText.setVisibility(View.GONE);
imvEmpty.setVisibility(View.GONE);
adapter.setList(advertisements);
adapter.notifyDataSetChanged();
} else {
ConstraintLayout.LayoutParams layoutParams = (ConstraintLayout.LayoutParams) btnCreateAd.getLayoutParams();
layoutParams.topToBottom = -1; //here i am trying to remove top constraint but it doesn't work
btnCreateAd.setLayoutParams(layoutParams);
recyclerView.setVisibility(View.GONE);
txvMyAdEmptyText.setVisibility(View.VISIBLE);
imvEmpty.setVisibility(View.VISIBLE);
adapter.setList(new ArrayList<Advertisement>());
}
mConstraintView.invalidate(); //this is my constraint view
编辑
我也尝试了 ConstraintSet
,但是结果甚至有所不同,我的RecyclerView(设置为父视图的边界)消失了
I have tried using ConstraintSet
also, but the result was even different somehow my RecyclerView (which is set to boundaries of parent view) was disappearing
ConstraintSet set = new ConstraintSet();
set.clone(parentView);
if (advertisements.size() > 0) {
recyclerView.setVisibility(View.VISIBLE);
txvMyAdEmptyText.setVisibility(View.GONE);
imvEmpty.setVisibility(View.GONE);
adapter.setList(advertisements);
adapter.notifyDataSetChanged();
} else {
set.connect(btnCreateAd.getId(), ConstraintSet.TOP, imvEmpty.getId(), ConstraintSet.BOTTOM, 0);
recyclerView.setVisibility(View.GONE);
txvMyAdEmptyText.setVisibility(View.VISIBLE);
imvEmpty.setVisibility(View.VISIBLE);
adapter.setList(new ArrayList<Advertisement>());
}
set.connect(btnCreateAd.getId(), ConstraintSet.END, ConstraintSet.PARENT_ID, ConstraintSet.END, 0);
set.connect(btnCreateAd.getId(), ConstraintSet.START, ConstraintSet.PARENT_ID, ConstraintSet.START, 0);
set.connect(btnCreateAd.getId(), ConstraintSet.BOTTOM, ConstraintSet.PARENT_ID, ConstraintSet.BOTTOM, 0);
set.applyTo(parentView);
推荐答案
我没有遍历您的代码,但是以下内容说明了如何使用ConstraintSet
破坏和建立约束.
I have not worked through your code, but the following illustrates how to break and make the constraint using ConstraintSet
.
ConstraintSet set = new ConstraintSet();
ConstraintLayout layout;
layout = (ConstraintLayout) findViewById(R.id.layout);
set.clone(layout);
// The following breaks the connection.
set.clear(R.id.bottomText, ConstraintSet.TOP);
// Comment out line above and uncomment line below to make the connection.
// set.connect(R.id.bottomText, ConstraintSet.TOP, R.id.imageView, ConstraintSet.BOTTOM, 0);
set.applyTo(layout);
这篇关于在ConstraintLayout中以编程方式删除/添加约束的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文