How to set layout weight attribute dynamically from code

Question

How can I set the value for the attribute layout weight for button in android dynamically from java code

User · Accepted Answer

You can pass it in as part of the LinearLayout LayoutParams constructor   LinearLayout LayoutParams param   new LinearLayout LayoutParams      LayoutParams MATCH PARENT      LayoutParams MATCH PARENT      1 0f    YOUR VIEW setLayoutParams param     The last parameter is the weight

User · Answer

Using Kotlin you can do something like   import android content Context import android support v4 content ContextCompat import android support v7 widget CardView import android widget    import android widget LinearLayout  class RespondTo   CardView       constructor context  Context    super context            init context             private fun init context  Context              val parent   LinearLayout context           parent apply               layoutParams   LinearLayout LayoutParams FrameLayout LayoutParams MATCH PARENT                      FrameLayout LayoutParams WRAP CONTENT  1 0f  apply                   orientation   LinearLayout HORIZONTAL                  addView EditText context  apply                       id   generateViewId                       layoutParams   LinearLayout LayoutParams 0                              LinearLayout LayoutParams WRAP CONTENT  0 9f  apply                                                            addView ImageButton context  apply                       layoutParams   LinearLayout LayoutParams 0                              LinearLayout LayoutParams WRAP CONTENT  0 1f                      background   null                     setImageDrawable ContextCompat getDrawable context  R drawable ic save black 24px                       id   generateViewId                       layoutParams   RelativeLayout LayoutParams LinearLayout LayoutParams WRAP CONTENT                              LinearLayout LayoutParams WRAP CONTENT  apply                           addRule RelativeLayout ALIGN PARENT RIGHT                             addRule RelativeLayout LEFT OF  myImageButton id                                                                            this addView parent

User · Answer

If you already define your view in your layout xml  file  only want to change the weight programmatically  this way is better  LinearLayout LayoutParams params    LinearLayout LayoutParams     mButton getLayoutParams    params weight   1 0f  mButton setLayoutParams params     new a LayoutParams overwrites other params defined in you xml file like margins  or you need to specify all of them in LayoutParams

User · Answer

Use LinearLayout LayoutParams   LinearLayout LayoutParams params   new LinearLayout LayoutParams      LayoutParams WRAP CONTENT  LayoutParams MATCH PARENT   params weight   1 0f  Button button   new Button this   button setLayoutParams params     EDIT  Ah  Erich s answer is easier

User · Answer

If layoutparams is already defined  in XML or dynamically   Here s a one liner     LinearLayout LayoutParams  mView getLayoutParams    weight   1

User · Answer

If you have already defined your view in layout xml  file and only want to change the weight pro grammatically  then then creating new LayoutParams overwrites other params defined in you xml file    So first you should use  getLayoutParams  and then setLayoutParams  LinearLayout LayoutParams params    LinearLayout LayoutParams  mButton getLayoutParams     params weight   4f   mButton setLayoutParams params

User · Answer

If I someone looking for answer  use this         LinearLayout LayoutParams lay    LinearLayout LayoutParams  myLayout getLayoutParams    lay weight   0 5    If you are initializing your layout from xml file  this will be much more convenient than providing new layout parameters for Linear Layout

User · Answer

If the constructor with width  height and weight is not working  try using the constructor with width and height  And then manually set the weight   And if you want the width to be set according to the weight  set width as 0 in the constructor  Same applies for height  Below code works for me   LinearLayout LayoutParams childParam1   new LinearLayout LayoutParams 0 LinearLayout LayoutParams MATCH PARENT   childParam1 weight   0 3f  child1 setLayoutParams childParam1    LinearLayout LayoutParams childParam2   new LinearLayout LayoutParams 0 LinearLayout LayoutParams MATCH PARENT   childParam2 weight   0 7f  child2 setLayoutParams childParam2    parent setWeightSum 1f   parent addView child1   parent addView child2

User · Answer

Any of LinearLayout LayoutParams and TableLayout LayoutParams worked for me  for buttons the right one is TableRow LayoutParams  That is               TableRow LayoutParams buttonParams   new TableRow LayoutParams                      TableRow LayoutParams MATCH PARENT                      TableRow LayoutParams WRAP CONTENT  1f     About using MATCH PARENT or WRAP CONTENT be the same

[android] How to set layout_weight attribute dynamically from code?

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