Programmatically set android:layout_centerHorizontal

In xml you can do the following:

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<TextView
    ...
    android:layout_centerHorizontal="true"
    ...
/>

How would I, when I have the instance of TextView, do this programmatically?

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You should use the addRule method of the RelativeLayout.LayoutParams class.

layoutparams.addRule(RelativeLayout.CENTER_HORIZONTAL);
mTextView.setLayoutParams(layoutParams);

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Assuming you have a TextView called stored in a variable tv:

RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) tv.getLayoutParams();
lp.addRule(RelativeLayout.CENTER_HORIZONTAL);
tv.setLayoutParams(lp);

Should do the trick.

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After 10 minutes of fighting I found how to do it in Kotlin:

N.B. - I am using view binding

val centerHorizontal = binding.tvOccupantName.layoutParams as RelativeLayout.LayoutParams
centerVertical.addRule(RelativeLayout.CENTER_HORIZONTAL)
binding.tvOccupantName.layoutParams = centerHorizontal

Hope it helps!

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Assume that txtPhone is the textview that we are trying to place it center in horizontal.

If you are using Java then use the following code,

RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) txtPhone.getLayoutParams();
layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
txtPhone.setLayoutParams(layoutParams);

If you are using Kotlin then use the following code,

val layoutParams = txtPhone.getLayoutParams() as RelativeLayout.LayoutParams
layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL)
txtPhone.setLayoutParams(layoutParams)