How to resize a custom view programmatically

Question

I am coding a custom view  extended from RelativeLayout  and I want to resize it programmatically  How can I do   the custom view Class is something like   public ActiveSlideView Context context  AttributeSet attr           super context  attr           LayoutInflater inflater    LayoutInflater context getSystemService Context LAYOUT INFLATER SERVICE           if inflater    null                      inflater inflate R layout active slide  this

User · Answer

if you are overriding onMeasure  don t forget to update the new sizes   Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        setMeasuredDimension newWidth  newHeight

User · Answer

If you have only two or three condition sizes  then you can use  Overide onMeasure like    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec         super onMeasure widthMeasureSpec  heightMeasureSpec          And change your size for these conditions in CustomView class easily

User · Answer

Here s a more generic version of the solution above from  herbertD     private void resizeView View view  int newWidth  int newHeight         try            Constructor lt   extends LayoutParams gt  ctor   view getLayoutParams   getClass   getDeclaredConstructor int class  int class            view setLayoutParams ctor newInstance newWidth  newHeight             catch  Exception e             e printStackTrace

User · Answer

For what it s worth  let s say you wanted to resize the view in device independent pixels  dp   - You need to use a method called applyDimension  that s a member of the class TypedValue to convert from dp to pixels  So if I want to set the height to 150dp  say  - then I could do this  float pixels   TypedValue applyDimension TypedValue COMPLEX UNIT DIP  150  getResources   getDisplayMetrics     LinearLayout LayoutParams params    LinearLayout LayoutParams  someLayout getLayoutParams    params height    int  pixels  someLayout setLayoutParams params    where the expression  getResources   getDisplayMetrics   gets the screen density resolution

User · Answer

In Kotlin  you can use the ktx extensions   yourView updateLayoutParams      height    lt YOUR HEIGHT gt

User · Answer

This works for me   ViewGroup LayoutParams params   layout getLayoutParams    params height   customHeight  layout requestLayout

User · Answer

This is what I did  View myView    myView getLayoutParams   height   32    myView getLayoutParams   width   32   If there is a view group that this view belongs to  you may also need to call yourViewGroup requestLayout   for it to take effect

User · Answer

try a this one       View view   inflater inflate R layout active slide  this   view setMinimumWidth 200

User · Answer

I solved it this way   I have basically a simple view inside xml file    View viewname   findViewById R id prod extra                prodExtra getLayoutParams   height 64

User · Answer

This is how I achieved this  In Sileria answer he she did the following   ViewGroup LayoutParams params   layout getLayoutParams    params height   customHeight  layout requestLayout      This is correct  but it expects us to give the height in pixels  but I wanted to give the dp I want the height to be so I added   public int convertDpToPixelInt float dp  Context context        return  int   dp      float  context getResources   getDisplayMetrics   densityDpi    160 0f        So it will look like this   ViewGroup LayoutParams params   layout getLayoutParams    params height   convertDpToPixelInt 50  getContext     layout requestLayout

User · Answer

With Kotlin and using dp unit  myView updateLayoutParams       val pixels   TypedValue applyDimension TypedValue COMPLEX UNIT DIP  200f  context resources displayMetrics      height   pixels toInt

User · Answer

this setLayoutParams new LinearLayout LayoutParams LayoutParams FILL PARENT  theSizeIWant      Problem solved    NOTE  Be sure to use the parent Layout s LayoutParams  Mine is LinearLayout LayoutParams

User · Answer

I used this way to increase width of custom view  customDrawingView post new Runnable                                  Override                             public void run                                     View view instance   customDrawingView                                  android view ViewGroup LayoutParams params   view instance                                          getLayoutParams                                    int newLayoutWidth   customDrawingView                                          getWidth                                             customDrawingView getWidth                                    params width   newLayoutWidth                                  view instance setLayoutParams params                                   screenWidthBackup   params width

User · Answer

Android throws an exception if you fail to pass the height or width of a view  Instead of creating a new LayoutParams object  use the original one  so that all other set parameters are kept  Note that the type of LayoutParams returned by getLayoutParams is that of the parent layout  not the view you are resizing   RelativeLayout LayoutParams params    RelativeLayout LayoutParams  someLayout getLayoutParams    params height   130  someLayout setLayoutParams params

[android] How to resize a custom view programmatically?

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