Add padding on view programmatically

Question

I am developing Android v2 2 app  I have a Fragment  In the onCreateView      callback of my fragment class  I inflate an layout to the fragment like below   Override public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View view   inflater inflate R layout login  null                return view     The above inflated layout file is  login xml    lt  xml version  quot 1 0 quot  encoding  quot utf-8 quot   gt   lt LinearLayout xmlns android  quot http   schemas android com apk res android quot      android layout width  quot fill parent quot      android layout height  quot fill parent quot      android orientation  quot vertical quot  gt        lt TextView         android layout width  quot fill parent quot          android layout height  quot wrap content quot          android text  quot Username quot    gt             lt TextView         android layout width  quot fill parent quot          android layout height  quot wrap content quot          android text  quot Username quot    gt    lt  LinearLayout gt   I would like to set a paddingTop to the above  lt LinearLayout gt  element   and I want to do it in the Java code instead of do it in xml  How to set paddingTop to  lt LinearLayout gt  in my fragment Java class code

User · Answer

Write Following Code to set padding  it may help you   TextView ApplyPaddingTextView    TextView findViewById R id textView1   final LayoutParams layoutparams    RelativeLayout LayoutParams  ApplyPaddingTextView getLayoutParams     layoutparams setPadding 50 50 50 50    ApplyPaddingTextView setLayoutParams layoutparams     Use LinearLayout LayoutParams or RelativeLayout LayoutParams according to parent layout of the child view

User · Answer

Context contect MainActivity this  TextView tview new TextView context   tview setPaddingRelative 10 0 0 0

User · Answer

use below method for setting padding dynamically   setPadding int left  int top  int right  int bottom    Example    view setPadding 2 2 2 2

User · Answer

The best way is not to write your own funcion  Let me explain the motivaion - please lookup the official Android source code  In TypedValue java we have      public static int complexToDimensionPixelSize int data              DisplayMetrics metrics                final float value   complexToFloat data           final float f   applyDimension                   data gt  gt COMPLEX UNIT SHIFT  amp COMPLEX UNIT MASK                  value                  metrics           final int res    int    f  gt   0     f   0 5f     f - 0 5f            if  res    0  return res          if  value    0  return 0          if  value  gt  0  return 1          return -1         and      public static float applyDimension int unit  float value                                         DisplayMetrics metrics                switch  unit            case COMPLEX UNIT PX              return value          case COMPLEX UNIT DIP              return value   metrics density          case COMPLEX UNIT SP              return value   metrics scaledDensity          case COMPLEX UNIT PT              return value   metrics xdpi    1 0f 72           case COMPLEX UNIT IN              return value   metrics xdpi          case COMPLEX UNIT MM              return value   metrics xdpi    1 0f 25 4f                     return 0         As you can see  DisplayMetrics metrics can differ  which means it would yield different values across Android-OS powered devices  I strongly recommend putting your dp padding in dimen xml file and use the official Android conversions to have consistent behaviour with regard to how Android framework works

User · Answer

view setPadding 0 padding 0 0    This will set the top padding to padding-pixels    If you want to set it in dp instead  you can do a conversion   float scale   getResources   getDisplayMetrics   density  int dpAsPixels    int   sizeInDp scale   0 5f

User · Answer

You can set padding to your view by pro grammatically throughout below code -   view setPadding 0 1 20 3     And  also there are different type of padding available -   Padding  PaddingBottom  PaddingLeft  PaddingRight  PaddingTop  These  links will refer Android Developers site  Hope this helps you lot

User · Answer

If you store the padding in resource files  you can simply call  int padding   getResources   getDimensionPixelOffset R dimen padding     It does the conversion for you

User · Answer

Using Kotlin and the android-ktx library  you can simply do   view updatePadding top   42    See docs here

User · Answer

To answer your second question   view setPadding 0 padding 0 0     like SpK and Jave suggested  will set the padding in pixels  You can set it in dp by calculating the dp value as follows   int paddingDp   25  float density   context getResources   getDisplayMetrics   density int paddingPixel    int  paddingDp   density   view setPadding 0 paddingPixel 0 0     Hope that helps

User · Answer

Using TypedValue is a much cleaner way of converting to pixels compared to manually calculating   float paddingDp   10f     Convert to pixels int paddingPx    int  TypedValue applyDimension TypedValue COMPLEX UNIT DIP  paddingDp  context getResources   getDisplayMetrics     view setPadding paddingPx  paddingPx  paddingPx  paddingPx     Essentially  TypedValue applyDimension converts the desired padding into pixels appropriately depending on the current device s display properties   For more info see  TypedValue applyDimension Docs

User · Answer

While padding programmatically  convert to density related values by converting pixel to Dp

[android] Add padding on view programmatically

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