How to set android view's layout_alignParentEnd property by code?

Question

How can I set the alignParentEnd property programmatically?

I searched all over the Android Developer website, but I couldn't find any reference to setting properties like alignParentEnd in code. It is only explained how to set them in XML. Where could I find documentation for something like this in the future?

Answer 1

LayoutParams are used to set layout properties in code. alignParentEnd is a property of RelativeLayout so you have to use RelativeLayout.LayoutParams. You can find the documentation here.

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So to set the property in code you can use the addRule() method of the RelativeLayout.LayoutParams. For example you can do this:

// Create the LayoutParams
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

// Add all the rules you need
params.addRule(RelativeLayout.ALIGN_PARENT_END);
...

// Once you are done set the LayoutParams to the layout
relativeLayout.setLayoutParams(params);

You can find a list of all rules which you can set with addRule() here.

Answer 2

Parameter are added in View and ViewGroup using LayoutParam.

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) my_child_view.getLayoutParams();
params.addRule(RelativeLayout.ALIGN_PARENT_END);
my_child_view.setLayoutParams(params);