Android How to Programmatically set the size of a Layout

Question

As part of an Android App I am building a button set  The buttons are part of a nested set of LinearLayouts  Using weight I have the set resizing itself automatically based on the size of the containing parent LinearLayout  The idea is  based on the pixel count and density of the screen  to set the size of the containing layout to a number of pixels  and have the button set resize itself based on that change   The question then is  How to resize the layout    I have tried several suggested techniques  and none come close to working  Here is a subset of the XML that builds the button set        lt LinearLayout android layout height  104pt  android id    id numberPadLayout  android orientation  horizontal  android layout width  104pt      android background   a0a0a0      android layout alignParentBottom  true       android layout centerHorizontal  true   gt        lt LinearLayout android layout weight  2  android layout height  fill parent  android id    id linearLayout1  android orientation  vertical  android layout width  wrap content  gt           lt Button android text  1  android id    id button1  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  4  android id    id button4  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  7  android id    id button7  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  -  android id    id buttonDash  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt       lt  LinearLayout gt       lt LinearLayout android layout weight  2  android layout height  fill parent  android id    id linearLayout2  android orientation  vertical  android layout width  wrap content  gt           lt Button android text  2  android id    id button2  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  5  android id    id button5  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  8  android id    id button8  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  0  android id    id button0  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt       lt  LinearLayout gt        lt LinearLayout android layout weight  2  android layout height  fill parent  android id    id linearLayout3  android orientation  vertical  android layout width  wrap content  gt           lt Button android text  3  android id    id button3  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  6  android id    id button6  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text  9  android id    id button9  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text     android id    id buttonDot  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt       lt  LinearLayout gt       lt LinearLayout android layout weight  2  android layout height  fill parent  android id    id linearLayout4  android orientation  vertical  android layout width  wrap content  gt           lt Button android text     android id    id buttonBack  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt           lt Button android text     android id    id buttonEnter  android layout weight  2  android layout width  fill parent  android layout height  wrap content  gt  lt  Button gt       lt  LinearLayout gt    lt  LinearLayout gt        The two questions are  1  how do I get access to numberPadLayout from Java  And once I have access to the view  2  how do I change the height and width of the layout   Any suggestions will be appreciated

User · Accepted Answer

Java  This should work      Gets linearlayout LinearLayout layout   findViewById R id numberPadLayout      Gets the layout params that will allow you to resize the layout LayoutParams params   layout getLayoutParams       Changes the height and width to the specified  pixels  params height   100  params width   100  layout setLayoutParams params     If you want to convert dip to pixels  use this   int height    int  TypedValue applyDimension TypedValue COMPLEX UNIT DIP   lt HEIGHT gt   getResources   getDisplayMetrics       Kotlin

User · Answer

You can get the actual height of called layout with this code   public int getLayoutSize        Get the layout id     final LinearLayout root    LinearLayout  findViewById R id mainroot       final AtomicInteger layoutHeight   new AtomicInteger         root post new Runnable          public void run              Rect rect   new Rect             Window win   getWindow        Get the Window                 win getDecorView   getWindowVisibleDisplayFrame rect                       Get the height of Status Bar                 int statusBarHeight   rect top                      Get the height occupied by the decoration contents                  int contentViewTop   win findViewById Window ID ANDROID CONTENT  getTop                        Calculate titleBarHeight by deducting statusBarHeight from contentViewTop                   int titleBarHeight   contentViewTop - statusBarHeight                   Log i  MY    titleHeight       titleBarHeight     statusHeight       statusBarHeight     contentViewTop       contentViewTop                        By now we got the height of titleBar  amp  statusBar                    Now lets get the screen size                 DisplayMetrics metrics   new DisplayMetrics                    getWindowManager   getDefaultDisplay   getMetrics metrics                      int screenHeight   metrics heightPixels                  int screenWidth   metrics widthPixels                  Log i  MY    Actual Screen Height       screenHeight     Width       screenWidth                          Now calculate the height that our layout can be set                    If you know that your application doesn t have statusBar added  then don t add here also  Same applies to application bar also                  layoutHeight set screenHeight -  titleBarHeight   statusBarHeight                    Log i  MY    Layout Height       layoutHeight                      Lastly  set the height of the layout                    FrameLayout LayoutParams rootParams    FrameLayout LayoutParams root getLayoutParams                rootParams height   layoutHeight get                root setLayoutParams rootParams                      return layoutHeight get

User · Answer

LinearLayout YOUR LinearLayout   LinearLayout findViewById R id YOUR LinearLayout      LinearLayout LayoutParams param   new LinearLayout LayoutParams                           width   ViewGroup LayoutParams MATCH PARENT                   height   100                   weight   1 0f                                    YOUR LinearLayout setLayoutParams param

User · Answer

my sample code  wv    WebView  findViewById R id mywebview   wv getLayoutParams   height   LayoutParams MATCH PARENT     LayoutParams  android view ViewGroup LayoutParams    wv getLayoutParams   height   LayoutParams WRAP CONTENT  wv requestLayout     It is necesary to refresh the screen

[android] Android: How to Programmatically set the size of a Layout

Java

Kotlin

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