如何以编程方式删除在 XML 中定义的现有规则？
我有一个包含在相对布局内的线性布局。 它在 XML 文件中设置为另一个线性布局的右侧（这很好）。 在某些情况下，我想在活动的 onCreate 期间更改布局的相对位置，因此我需要修改“to the right of”参数以与另一个布局相关。 我尝试了这个：
RelativeLayout.LayoutParams layoutParams;
layoutParams = (RelativeLayout.LayoutParams) linearLayoutToMove
.getLayoutParams();
layoutParams.addRule(RelativeLayout.RIGHT_OF,
R.id.new_ref_LinearLayout);
但它不起作用：o(
有任何线索吗？
I have a linear layout that is contained inside a relative layout.
It is set in the XML file to be to the right of another linear layout (this works fine).
In some cases I want to change the relative position of the layout during the onCreate of the activity so I need to modify the "to the right of" param to relate to another layout.
I tryed this:
RelativeLayout.LayoutParams layoutParams;
layoutParams = (RelativeLayout.LayoutParams) linearLayoutToMove
.getLayoutParams();
layoutParams.addRule(RelativeLayout.RIGHT_OF,
R.id.new_ref_LinearLayout);
But it does not work :o(
Any clues ?
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评论（3）
您无法删除规则，因为所有规则始终存储在固定大小的 java 数组中。但您可以将规则设置为
0。例如编辑（感谢Roger Rapid）：
从API级别17开始，类
relativeLayout.LayoutParams具有以下方法：因此您可以使用以下代码行删除规则：
并且您将获得与“添加”零规则时完全相同的结果：
You can't remove a rule because all rules are always stored in a fixed-size java array. But you can set a rule to
0. For exampleEDIT (thanks to Roger Rapid):
As of API level 17, the class
RelativeLayout.LayoutParamshas the following method:So you can remove a rule using the following line of code:
And you will get exactly the same result as when 'adding' a zero-rule as:
我认为您需要
调用：
relativeLayout.updateViewLayout(linearLayoutToMove, layoutParams);在更改 LayoutParams 后
。为了回复编辑，您可以使用以下命令创建新的 LayoutParameters：
然后添加新规则。然后，使用前面提到的 updateViewLayout() 方法更新布局参数。
I think you need to call:
relativeLayout.updateViewLayout(linearLayoutToMove, layoutParams);after changing the LayoutParams.
In reply to the edit, you can create new LayoutParameters using:
and then add your new rules. Then, update the layout parameters using the previously mentioned updateViewLayout() method.
将以下代码添加到现有代码中
linearLayoutToMove.setLayoutParams(layoutParams)我认为这应该可以完成这项工作。如果上面的行不起作用，请尝试在上面的行之后调用
linearLayoutToMove.invalidate()。add the following code to your existing code
linearLayoutToMove.setLayoutParams(layoutParams)I think this should do the job. In case if the above line dont work, try to call
linearLayoutToMove.invalidate()after the above line.