How to set layout gravity programmatically

Question

My question is simple   How to set my buttons layout gravity programmatically   I found this on internet  but it simply throws me a Nullpointer exception    Button MyButton   new Button this        LinearLayout LayoutParams  lllp  LinearLayout LayoutParams MyButton getLayoutParams        lllp gravity Gravity RIGHT      MyButton setLayoutParams lllp          MyLinearLayout addView MyButton     Any solution

User · Answer

The rest of the answers are right  I want to add more explaination  The layout gravity is about how to position the view in parent view   You must set gravity   after method parentView addView      was called   We can see the code    public void setLayoutParams ViewGroup LayoutParams params        if  params    null            throw new NullPointerException  Layout parameters cannot be null              mLayoutParams   params      resolveLayoutParams        if  mParent instanceof ViewGroup              ViewGroup  mParent  onSetLayoutParams this  params             requestLayout        And the problem of null pointer is because it s not calling addView before getLayoutParams      The annotation was already said  This method may return null if this View is not attached to a parent ViewGroup or   link setLayoutParams android view ViewGroup LayoutParams   was not invoked successfully  When a View is attached to a parent ViewGroup  this method must not return null

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Java  LinearLayout LayoutParams params   new LinearLayout LayoutParams LayoutParams WRAP CONTENT  LayoutParams MATCH PARENT   params weight   1 0f  params gravity   Gravity TOP   button setLayoutParams params     Kotlin  val params   LinearLayout LayoutParams      LinearLayout LayoutParams WRAP CONTENT      LinearLayout LayoutParams WRAP CONTENT   apply       weight   1 0f     gravity   Gravity TOP     For gravity values and how to set gravity check Gravity   Basically  you should choose the LayoutParams depending on the parent  It can be RelativeLayout  LinearLayout etc

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int width getResources   getDisplayMetrics   widthPixels    LinearLayout LayoutParams params   new LinearLayout LayoutParams                      width  width                params gravity   Gravity CENTER              iv main text   new HTextView getContext                 iv main text setLayoutParams params               iv main text setBackgroundColor Color BLUE               iv main text setTextSize 60               iv main text setGravity Gravity CENTER               iv main text setTextColor Color BLACK

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Modify the existing layout params and set layout params again   Get the current layout params and update the Gravity  iv layoutParams as FrameLayout LayoutParams  gravity   Gravity START   Set layout params again  this updates the view  iv layoutParams   layoutParams

User · Answer

Perfectly Working    None of the above answer works for me  In Xml file setting gravity and setting layout gravity is different  Check out the below code     here messageLL is the linear layout in the xml file    Before adding any view just remove all views    messageLL removeAllViews       FrameLayout is the parent for LinearLayout FrameLayout LayoutParams params   new     FrameLayout LayoutParams ViewGroup LayoutParams MATCH PARENT  ViewGroup LayoutParams MATCH PARENT      params gravity   Gravity CENTER Gravity CENTER VERTICAL     messageLL setLayoutParams params      messageText setVisibility View GONE      messageNoText setVisibility View VISIBLE      messageLL addView messageNoText     Also check  This where you can find clear explanation about gravity and layout gravity

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KOTLIN setting more than one gravity on FrameLayout without changing size           assign more than one gravity Using the operator  or      var gravity   Gravity RIGHT or Gravity CENTER VERTICAL         update gravity      pagerContainer layoutParams as FrameLayout LayoutParams  gravity   gravity         refresh layout      pagerContainer requestLayout

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I switched from LinearLayout LayoutParams to RelativeLayout LayoutParams to finally get the result I was desiring on a custom circleview I created   But instead of gravity you use addRule  RelativeLayout LayoutParams mCircleParams   new RelativeLayout LayoutParams circleheight circleheight        mCircleParams addRule RelativeLayout CENTER IN PARENT

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FloatingActionButton sendFab   new FloatingActionButton this       FrameLayout LayoutParams layoutParams   new FrameLayout LayoutParams ViewGroup LayoutParams WRAP CONTENT  ViewGroup LayoutParams WRAP CONTENT       layoutParams setMargins 32  32  32  32       layoutParams gravity   Gravity END Gravity BOTTOM      sendFab setLayoutParams layoutParams       sendFab setImageResource android R drawable ic menu send

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Most of above answer are right  so written a helper methods  so you can use it  directly in you project       set layout gravity programmtically      gravity types   Gravity BOTTOM  Gravity START etc     view   can be any view example   button  textview  linearlayout  image etc      for single view    public static void setLayoutGravity int gravity  View view          LinearLayout LayoutParams  view getLayoutParams    gravity   gravity             for mulitple views   public static void setLayoutGravity int gravity  View    view           for View item   view                LinearLayout LayoutParams  item getLayoutParams    gravity   gravity

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If you want to put a view in the center of parent  you can do with following code    public class myLayout extends LinearLayout        public myLayout Context context          super context          RelativeLayout vi    RelativeLayout    LayoutInflater  context              getSystemService Context LAYOUT INFLATER SERVICE   inflate              R layout activity main  null         LinearLayout LayoutParams cc   new LinearLayout LayoutParams              LayoutParams WRAP CONTENT  LayoutParams WRAP CONTENT         cc gravity   Gravity CENTER        this setGravity Gravity CENTER         this addView vi           these code section make LinearLayout put the first view elements in the center of parent  So  we system don t consider the initial width and high to arrange view in the center   I do the code section well

User · Answer

to RelativeLayout  try this code   it works for me  yourLayoutParams addRule RelativeLayout ALIGN PARENT RIGHT

User · Answer

In case you need to set Gravity for a View use the following   Button b new Button Context   b setGravity Gravity CENTER     For setting layout gravity for the Button use gravity field for the layoutparams as  LayoutParams lp new LayoutParams LayoutParams WRAP CONTENT LayoutParams WRAP CONTENT   lp gravity Gravity CENTER    try this  hope this clears thanks

User · Answer

MyButton setGravity Gravity RIGHT     For layout gravity use the answer stated by  karthi   This method sets gravity to place the children inside the view

User · Answer

Try this code      Button btn   new Button YourActivity this       btn setGravity Gravity CENTER   Gravity TOP       btn setText  some text      or      btn setGravity Gravity TOP

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layoutParams2 gravity   Gravity RIGHT Gravity BOTTOM    use this to add mor than one gravity

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I d hate to be resurrecting old threads but this is a problem that is not answered correctly and moreover I ve ran into this problem myself   Here s the long bit  if you re only interested in the answer please scroll all the way down to the code   android gravity and android layout gravity works differently  Here s an article I ve read that helped me   GIST of article  gravity affects view after height width is assigned  So gravity centre will not affect a view that is done FILL PARENT  think of it as auto margin   layout gravity centre WILL affect view that is FILL PARENT  think of it as auto pad    Basically  android layout gravity CANNOT be access programmatically  only android gravity  In the OP s case and my case  the accepted answer does not place the button vertically centre   To improve on Karthi s answer   LinearLayout LayoutParams params   new LinearLayout LayoutParams  LayoutParams WRAP CONTENT  LayoutParams WRAP CONTENT   params gravity   Gravity CENTER  button setLayoutParams params     Link to LinearLayout LayoutParams   android layout gravity shows  No related methods  meaning cannot be access programatically  Whereas gravity is a field in the class

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This question is old but I just had the same problem and solved it like this  LayoutParams lay   new LayoutParams LayoutParams FILL PARENT LayoutParams FILL PARENT  lay gravity   Gravity CENTER

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I use someting like that   Xamarin and C  code     LinearLayout linLayout  new LinearLayout this        linLayout SetGravity GravityFlags Center        TextView txtView  new TextView this          linLayout AddView txtView      the SetGravity puts my textView in the center of the layout  So SetGravity layout property refer to layout content

User · Answer

I had a similar problem with programmatically setting layout gravity on buttons in a GridLayout    The trick was to set gravity on the button layoutParams AFTER the button was added to a parent  GridLayout   otherwise the gravity would be ignored   grid addView button    GridLayout LayoutParams button getLayoutParams    setGravity int

User · Answer

If you want to change the layou gravity of an existing view do this      FrameLayout LayoutParams  view getLayoutParams    gravity   Gravity BOTTOM    Remember to use the right LayoutParams based on the Layout type your view is in  Ex   LinearLayout LayoutParams

[android] How to set layout_gravity programmatically?

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