How to programmatically set the layout align parent right attribute of a Button in Relative Layout

Question

I have a relative layout which I am creating programmatically    RelativeLayout layout   new RelativeLayout  this        RelativeLayout LayoutParams params   new RelativeLayout LayoutParams LayoutParams FILL PARENT              LayoutParams WRAP CONTENT     Now I have two buttons which I want to add in this relative layout  But the problem is both buttons are being shown on the left of the RelatiiveLayout overlapping on each other    buttonContainer addView btn1   buttonContainer addView btn2     Now I want to know how can I programmatically set the the android layout alignParentRight  true  or  android layout toLeftOf   id btn  attribute of buttons as we do in the xml

User · Answer

For adding a RelativeLayout attribute whose value is true or false use 0 for false and RelativeLayout TRUE for true   RelativeLayout LayoutParams params    RelativeLayout LayoutParams  button getLayoutParams   params addRule RelativeLayout ALIGN PARENT RIGHT  RelativeLayout TRUE    It doesn t matter whether or not the attribute was already added  you still use addRule verb  subject  to enable disable it  However  post-API 17 you can use removeRule verb  which is just a shortcut for addRule verb  0

User · Answer

You can access any LayoutParams from code using View getLayoutParams  You just have to be very aware of what LayoutParams your accessing  This is normally achieved by checking the containing ViewGroup if it has a LayoutParams inner child then that s the one you should use  In your case it s RelativeLayout LayoutParams  You ll be using RelativeLayout LayoutParams addRule int verb  and RelativeLayout LayoutParams addRule int verb  int anchor   You can get to it via code   RelativeLayout LayoutParams params    RelativeLayout LayoutParams button getLayoutParams    params addRule RelativeLayout ALIGN PARENT RIGHT   params addRule RelativeLayout LEFT OF  R id id to be left of    button setLayoutParams params     causes layout update

User · Answer

you need to create and id for the buttons you need to refference  btn1 setId 1   you can use the params variable to add parameters to your layout  i think the method is addRule    check out the android java docs for this LayoutParams object

User · Answer

Kotlin version   Use these extensions with infix functions that simplify later calls  infix fun View below view  View         this layoutParams as  RelativeLayout LayoutParams   addRule RelativeLayout BELOW  view id     infix fun View leftOf view  View         this layoutParams as  RelativeLayout LayoutParams   addRule RelativeLayout LEFT OF  view id     infix fun View alightParentRightIs aligned  Boolean        val layoutParams   this layoutParams as  RelativeLayout LayoutParams     if  aligned             this layoutParams as  RelativeLayout LayoutParams   addRule RelativeLayout ALIGN PARENT RIGHT        else            this layoutParams as  RelativeLayout LayoutParams   addRule RelativeLayout ALIGN PARENT RIGHT  0            this layoutParams   layoutParams     Then use them as infix functions calls   view1 below view2 view1 leftOf view2 view1 alightParentRightIs true   Or you can use them as normal functions   view1 below view2  view1 leftOf view2  view1 alightParentRightIs true

[android] How to programmatically set the layout_align_parent_right attribute of a Button in Relative Layout?

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