Change the Right Margin of a View Programmatically

Question

Can this attribute be changed dynamically in Java code    android layout marginRight   I have a TextView  that has to change its position some pixels to the left dynamically   How to do it programmatically

User · Answer

Use This function to set all Type of margins        public void setViewMargins Context con  ViewGroup LayoutParams params               int left  int top   int right  int bottom  View view         final float scale   con getResources   getDisplayMetrics   density         convert the DP into pixel     int pixel left    int   left   scale   0 5f       int pixel top    int   top   scale   0 5f       int pixel right    int   right   scale   0 5f       int pixel bottom    int   bottom   scale   0 5f        ViewGroup MarginLayoutParams s    ViewGroup MarginLayoutParams  params      s setMargins pixel left  pixel top  pixel right  pixel bottom        view setLayoutParams params

User · Answer

Update  Android KTX The Core KTX module provides extensions for common libraries that are part of the Android framework  androidx core view among them  dependencies       implementation  quot androidx core core-ktx  latest-version  quot     The following extension functions are handy to deal with margins   Note  they are all extension functions of MarginLayoutParams  so first you need to get and cast the layoutParams of your view  val params    myView layoutParams as ViewGroup MarginLayoutParams     setMargins   extension function   Sets the margins of all axes in the ViewGroup s MarginLayoutParams   The dimension has to be provided in pixels  see the last section if you want to work with dp  inline fun MarginLayoutParams setMargins  Px size  Int   Unit    E g  16px margins params setMargins 16    updateMargins   extension function   Updates the margins in the ViewGroup s ViewGroup MarginLayoutParams  inline fun MarginLayoutParams updateMargins       Px left  Int   leftMargin        Px top  Int   topMargin        Px right  Int   rightMargin        Px bottom  Int   bottomMargin    Unit    Example  8px left margin  params updateMargins left   8    updateMarginsRelative   extension function   Updates the relative margins in the ViewGroup s MarginLayoutParams  start end instead of left right   inline fun MarginLayoutParams updateMarginsRelative       Px start  Int   marginStart        Px top  Int   topMargin        Px end  Int   marginEnd        Px bottom  Int   bottomMargin    Unit    E g  8px start margin  params updateMargins start   8   The following extension properties are handy to get the current margins  inline val View marginBottom  Int inline val View marginEnd  Int inline val View marginLeft  Int inline val View marginRight  Int inline val View marginStart  Int inline val View marginTop  Int    E g  get margin bottom val bottomPx   myView1 marginBottom   Using dp instead of px   If you want to work with dp  density-independent pixels  instead of px  you will need to convert them first  You can easily do that with the following extension property  val Int px  Int     get      this   Resources getSystem   displayMetrics density  toInt    Then you can call the previous extension functions like  params updateMargins start   16 px  end   16 px  top   8 px  bottom   8 px  val bottomDp   myView1 marginBottom dp   Old answer  In Kotlin you can declare an extension function like  fun View setMargins      leftMarginDp  Int    null      topMarginDp  Int    null      rightMarginDp  Int    null      bottomMarginDp  Int    null         if  layoutParams is ViewGroup MarginLayoutParams            val params   layoutParams as ViewGroup MarginLayoutParams         leftMarginDp  run   params leftMargin   this dpToPx context            topMarginDp  run   params topMargin   this dpToPx context            rightMarginDp  run   params rightMargin   this dpToPx context            bottomMarginDp  run   params bottomMargin   this dpToPx context            requestLayout            fun Int dpToPx context  Context   Int       val metrics   context resources displayMetrics     return TypedValue applyDimension TypedValue COMPLEX UNIT DIP  this toFloat    metrics  toInt      Then you can call it like  myView1 setMargins 8  16  34  42   Or  myView2 setMargins topMarginDp   8

User · Answer

Use LayoutParams  as explained already   However be careful which LayoutParams to choose  According to https   stackoverflow com a 11971553 3184778  you need to use the one that relates to the PARENT of the view you re working on  not the actual view   If for example the TextView is inside a TableRow  then you need to use TableRow LayoutParams instead of RelativeLayout or LinearLayout

User · Answer

EDIT  A more generic way of doing this that doesn t rely on the layout type  other than that it is a layout type which supports margins   public static void setMargins  View v  int l  int t  int r  int b        if  v getLayoutParams   instanceof ViewGroup MarginLayoutParams            ViewGroup MarginLayoutParams p    ViewGroup MarginLayoutParams  v getLayoutParams            p setMargins l  t  r  b           v requestLayout             You should check the docs for TextView  Basically  you ll want to get the TextView s LayoutParams object  and modify the margins  then set it back to the TextView  Assuming it s in a LinearLayout  try something like this  TextView tv    TextView findViewById R id my text view   LinearLayout LayoutParams params    LinearLayout LayoutParams tv getLayoutParams    params setMargins 0  0  10  0     substitute parameters for left  top  right  bottom tv setLayoutParams params    I can t test it right now  so my casting may be off by a bit  but the LayoutParams are what need to be modified to change the margin  NOTE  Don t forget that if your TextView is inside  for example  a RelativeLayout  one should use RelativeLayout LayoutParams instead of LinearLayout LayoutParams

[android] Change the Right Margin of a View Programmatically?

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