Add floating point value to android resources values

Question

I m trying to add a little space between lines to my TextViews using android lineSpacingMultiplier from the documentation      Extra spacing between lines of text    as a multiplier        Must be a floating point value  such   as  1 2     As I m using this in a few different TextViews I would like to add a global dimension value to my resources  but I don t know which tag to use  if it even exists  I have tried all resource types that make sense to me  but none of them works   What I would like to have would be something like this    lt resources gt       lt dimen name  text line spacing  gt 1 4 lt  dimen gt   lt  resources gt    Edit  I m aware of android lineSpacingExtra  which needs a dimension with an appended unit   but I d like to use android lineSpacingMultiplier if possible

User · Answer

As described in this link http   droidista blogspot in 2012 04 adding-float-value-to-your-resources html  Declare in dimen xml   lt item name  my float value  type  dimen  format  float  gt 9 52 lt  item gt    Referencing from xml   dimen my float value   Referencing from java  TypedValue typedValue   new TypedValue    getResources   getValue R dimen my float value  typedValue  true   float myFloatValue   typedValue getFloat

User · Answer

All the solutions suggest you to use the predefined float value through code   But in case you are wondering how to reference the predefined float value in XML  for example layouts   then following is an example of what I did and it s working perfectly   Define resource values as type  integer  but format  float   for example    lt item name  windowWeightSum  type  integer  format  float  gt 6 0 lt  item gt   lt item name  windowNavPaneSum  type  integer  format  float  gt 1 5 lt  item gt   lt item name  windowContentPaneSum  type  integer  format  float  gt 4 5 lt  item gt    And later use them in your layout using  integer name of resource  for example    lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent      android weightSum   integer windowWeightSum                     float 6 0     android orientation  horizontal  gt        lt LinearLayout         android layout width  0dp          android layout height  match parent          android layout weight   integer windowNavPaneSum            float 1 5         android orientation  vertical  gt           lt  -- other views -- gt       lt  LinearLayout gt        lt LinearLayout         android layout width  0dp          android layout height  match parent          android layout weight   integer windowContentPaneSum        float 4 5         android orientation  vertical  gt           lt  -- other views -- gt       lt  LinearLayout gt    lt  LinearLayout gt

User · Answer

Although I ve used the accepted answer in the past  it seems with the current Build Tools it is possible to do       lt dimen name  listAvatarWidthPercent  gt 0 19 lt  dimen gt    I m using Build Tools major version 29

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Add a float to dimens xml    lt item format  float  name  my dimen  type  dimen  gt 1 2 lt  item gt   To reference from XML    lt EditText      android lineSpacingMultiplier   dimen my dimen            To read this value programmatically you can use ResourcesCompat getFloat from androidx core  Gradle dependency   implementation  androidx core core   version     Usage   import androidx core content res ResourcesCompat        float value   ResourcesCompat getFloat context getResources    R dimen my dimen

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I found a solution  which works  but does result in a Warning  WARN Resources 268   Converting to float  TypedValue t 0x3 d 0x4d  1 2  a 2 r 0x7f06000a   in LogCat    lt resources gt       lt string name  text line spacing  gt 1 2 lt  string gt   lt  resources gt    lt android lineSpacingMultiplier   string text line spacing   gt

User · Answer

There is a solution    lt resources gt       lt item name  text line spacing  format  float  type  dimen  gt 1 0 lt  item gt   lt  resources gt    In this way  your float number will be under  dimen  Notice that you can use other  format  and or  type  modifiers  where format stands for    Format   enclosing data type    float boolean fraction integer       and type stands for   Type   resource type  referenced with R XXXXX name     color dimen string style etc      To fetch resource from code  you should use this snippet   TypedValue outValue   new TypedValue    getResources   getValue R dimen text line spacing  outValue  true   float value   outValue getFloat        I know that this is confusing  you d expect call like getResources   getDimension R dimen text line spacing    but Android dimensions have special treatment and pure  float  number is not valid dimension     Additionally  there is small  hack  to put float number into dimension  but be WARNED that this is really hack  and you are risking chance to lose float range and precision    lt resources gt       lt dimen name  text line spacing  gt 2 025px lt  dimen gt   lt  resources gt    and from code  you can get that float by  float lineSpacing   getResources   getDimension R dimen text line spacing     in this case  value of lineSpacing is 2 024993896484375  and not 2 025 as you would expected

User · Answer

I used a style to solve this issue   The official link is here     Pretty useful stuff   You make a file to hold your styles  like  styles xml    and define them inside it   You then reference the styles in your layout  like  main xml     Here s a sample style that does what you want    lt style name  text line spacing  gt      lt item name  android lineSpacingMultiplier  gt 1 4 lt  item gt   lt  style gt    Let s say you want to alter a simple TextView with this   In your layout file you d type    lt TextView    style   style summary text            android text  This sentence has 1 4 times more spacing than normal     gt    Try it--this is essentially how all the built-in UI is done on the android   And by using styles  you have the option to modify all sorts of other aspects of your Views as well

User · Answer

If you have simple floats that you control the range of  you can also have an integer in the resources and divide by the number of decimal places you need straight in code   So something like this   lt integer name  strokeWidth  gt 356 lt  integer gt    is used with 2 decimal places  this strokeWidthFromResources   resources  getInteger R integer strokeWidth       circleOptions strokeWidth  float  strokeWidthFromResources  100     and that makes it 3 56f  Not saying this is the most elegant solution but for simple projects  it s convenient

User · Answer

I also found a workaround which seems to work fine with no warnings    lt resources gt       lt item name  the name  type  dimen  gt 255  lt  item gt       lt item name  another name  type  dimen  gt 15  lt  item gt   lt  resources gt    Then      theName   2 55f float theName   getResources   getFraction R dimen the name  1  1      anotherName   0 15f float anotherName   getResources   getFraction R dimen another name  1  1     Warning   it only works when you use the dimen from Java code not from xml

User · Answer

We can also use it for the guideline of the constraint layout   Create integer xml file and add into    lt item name  guideline button top  type  integer  format  float  gt 0 60 lt  item gt    Use from a layout xml file   app layout constraintGuide percent   integer guideline button top

[android] Add floating point value to android resources/values

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