Load dimension value from res values dimension xml from source code

Question

I d like to load the value as it is  I have two dimension xml files  one in  res values dimension xml and the other one in  res values-sw360dp dimension xml    From source code I d like to do something like   getResources   getDimension R dimen tutorial cross marginTop     This works but the value I get is multiplied times the screen density factor  1 5 for hdpi  2 0 for xhdpi  etc    I also tried to do   getResources   getString R dimen tutorial cross marginTop     This would work in principle but I get a string that ends in  dip

User · Answer

If you just want to change the size font dynamically then you can:

textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, resources.getDimension(R.dimen.tutorial_cross_marginTop))

As @achie's answer, you can get the dp from dimens.xml like this:

val dpValue = (resources.getDimension(R.dimen.tutorial_cross_marginTop)/ resources.displayMetrics.density).toInt()

or get sp like this

val spValue = (resources.getDimension(R.dimen.font_size)/ resources.displayMetrics.scaledDensity).toInt()

About Resources.java #{getDimension}

    /**
     * Retrieve a dimensional for a particular resource ID.  Unit 
     * conversions are based on the current {@link DisplayMetrics} associated
     * with the resources.
     * 
     * @param id The desired resource identifier, as generated by the aapt
     *           tool. This integer encodes the package, type, and resource
     *           entry. The value 0 is an invalid identifier.
     * 
     * @return Resource dimension value multiplied by the appropriate 
     * metric.
     * 
     * @throws NotFoundException Throws NotFoundException if the given ID does not exist.
     *
     * @see #getDimensionPixelOffset
     * @see #getDimensionPixelSize
     */

Resource dimension value multiplied by the appropriate

User · Answer

You can write integer in xml file also    have you seen  this     http   developer android com guide topics resources more-resources html Integer       use as     context getResources   getInteger R integer height pop

User · Answer

Context getResources   getDimension int id

User · Answer

The Resource class also has a method getDimensionPixelSize   which I think will fit your needs

User · Answer

For those who just need to save some int value in the resources  you can do the following   integers xml   lt  xml version  1 0  encoding  utf-8   gt   lt resources gt       lt integer name  default value  gt 100 lt  integer gt   lt  resources gt     Code  int defaultValue   getResources   getInteger R integer default value

User · Answer

This works but the value I get is multiplied times the screen density factor    1 5 for hdpi  2 0 for xhdpi  etc     I think it is good to get the value as per resolution but if you not want to do this give this in px         Density-independent pixel  dp   A virtual pixel unit that you should use when defining UI layout  to express layout dimensions or position in a density-independent way  The density-independent pixel is equivalent to one physical pixel on a 160 dpi screen  which is the baseline density assumed by the system for a  medium  density screen  At runtime  the system transparently handles any scaling of the dp units  as necessary  based on the actual density of the screen in use  The conversion of dp units to screen pixels is simple  px   dp    dpi   160   For example  on a 240 dpi screen  1 dp equals 1 5 physical pixels  You should always use dp units when defining your application s UI  to ensure proper display of your UI on screens with different densities   I think it is good to change the value as per resolution but if you not want to do this give this in px         refer this link   as per this   dp  Density-independent Pixels - An abstract unit that is based on the physical density of the screen  These units are relative to a 160 dpi  dots per inch  screen  on which 1dp is roughly equal to 1px  When running on a higher density screen  the number of pixels used to draw 1dp is scaled up by a factor appropriate for the screen s dpi  Likewise  when on a lower density screen  the number of pixels used for 1dp is scaled down  The ratio of dp-to-pixel will change with the screen density  but not necessarily in direct proportion  Using dp units  instead of px units  is a simple solution to making the view dimensions in your layout resize properly for different screen densities  In other words  it provides consistency for the real-world sizes of your UI elements across different devices   px  Pixels - Corresponds to actual pixels on the screen  This unit of measure is not recommended because the actual representation can vary across devices  each devices may have a different number of pixels per inch and may have more or fewer total pixels available on the screen

User · Answer

You can use getDimensionPixelOffset   instead of getDimension  so you didn t have to cast to int   int valueInPixels   getResources   getDimensionPixelOffset R dimen test

User · Answer

In my dimens xml I have    lt dimen name  test  gt 48dp lt  dimen gt    In code If I do   int valueInPixels    int  getResources   getDimension R dimen test    this will return 72 which as docs state is multiplied by density of current phone  48dp x 1 5 in my case   exactly as docs state       Retrieve a dimensional for a particular resource ID  Unit conversions   are based on the current DisplayMetrics associated with the resources    so if you want exact dp value just as in xml just divide it with DisplayMetrics density  int dp    int   getResources   getDimension R dimen test    getResources   getDisplayMetrics   density    dp will be 48 now

User · Answer

Use a Kotlin Extension  You can add an extension to simplify this process  It enables you to just call context dp R dimen  tutorial cross marginTop  to get the Float value  fun Context px  DimenRes dimen  Int   Int   resources getDimension dimen  toInt    fun Context dp  DimenRes dimen  Int   Float   px dimen    resources displayMetrics density   If you want to handle it without context  you can use Resources getSystem     val Int dp get     this   Resources getSystem   displayMetrics density    Float  val Int px get      this   Resources getSystem   displayMetrics density  toInt     For example  on an xhdpi device  use 24 dp to get 12 0 or 12 px to get 24

[android] Load dimension value from res/values/dimension.xml from source code

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