Converting pixels to dp

Question

I have created my application with the height and width given in pixels for a Pantech device whose resolution is 480x800   I need to convert height and width for a G1 device  I thought converting it into dp will solve the problem and provide the same solution for both devices    Is there any easy way to convert pixels to dp  Any suggestions

User · Answer

Kotlin  fun convertDpToPixel dp  Float  context  Context   Float       return dp    context resources displayMetrics densityDpi toFloat     DisplayMetrics DENSITY DEFAULT     fun convertPixelsToDp px  Float  context  Context   Float       return px    context resources displayMetrics densityDpi toFloat     DisplayMetrics DENSITY DEFAULT      Java  public static float convertDpToPixel float dp  Context context        return dp     float  context getResources   getDisplayMetrics   densityDpi   DisplayMetrics DENSITY DEFAULT      public static float convertPixelsToDp float px  Context context        return px     float  context getResources   getDisplayMetrics   densityDpi   DisplayMetrics DENSITY DEFAULT

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You can therefore use the following formulator to calculate the right amount of pixels from a dimension specified in dp  public int convertToPx int dp           Get the screen s density scale     final float scale   getResources   getDisplayMetrics   density         Convert the dps to pixels  based on density scale     return  int   dp   scale   0 5f

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This is how it works for me   DisplayMetrics displaymetrics   new DisplayMetrics    getWindowManager   getDefaultDisplay   getMetrics displaymetrics   int  h   displaymetrics heightPixels  float  d   displaymetrics density  int heightInPixels  int   h d     You can do the same for the width

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This workds for me  C     int pixels    int   dp    Resources System DisplayMetrics Density   0 5f

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float scaleValue   getContext   getResources   getDisplayMetrics   density  int pixels    int   dps   scaleValue   0 5f

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To convert dp to px this code can be helpful      public static int dpToPx Context context  int dp           final float scale   context getResources   getDisplayMetrics   density         return  int   dp   scale   0 5f

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For anyone using Kotlin   val Int toPx  Int     get      this   Resources getSystem   displayMetrics density  toInt    val Int toDp  Int     get      this   Resources getSystem   displayMetrics density  toInt     Usage   64 toPx 32 toDp

User · Answer

You should use dp just as you would pixels  That s all they are  display independent pixels  Use the same numbers you would on a medium density screen  and the size will be magically correct on a high density screen   However  it sounds like what you need is the fill parent option in your layout design  Use fill parent when you want your view or control to expand to all the remaining size in the parent container

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kotlin      fun spToPx ctx  Context  sp  Float   Float       return sp   ctx resources displayMetrics scaledDensity    fun pxToDp context  Context  px  Float   Float       return px   context resources displayMetrics density    fun dpToPx context  Context  dp  Float   Float       return dp   context resources displayMetrics density     java       public static float spToPx Context ctx float sp       return sp   ctx getResources   getDisplayMetrics   scaledDensity     public static float pxToDp final Context context  final float px        return px   context getResources   getDisplayMetrics   density     public static float dpToPx final Context context  final float dp        return dp   context getResources   getDisplayMetrics   density

User · Answer

According to the Android Development Guide   px   dp    dpi   160    But often you ll want do perform this the other way around when you receive a design that s stated in pixels  So   dp   px    dpi   160    If you re on a 240dpi device this ratio is 1 5  like stated before   so this means that a 60px icon equals 40dp in the application

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For DP to Pixel  Create a value in dimens xml   lt dimen name  textSize  gt 20dp lt  dimen gt    Get that value in pixel as   int sizeInPixel   context getResources   getDimensionPixelSize R dimen textSize

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to convert Pixels to dp use the TypedValue     As the documentation mentioned   Container for a dynamically typed data value     and use the applyDimension method     public static float applyDimension  int unit  float value  DisplayMetrics metrics     which Converts an unpacked complex data value holding a dimension to its final floating point value like the following     Resources resource   getResources    float dp   TypedValue applyDimension TypedValue COMPLEX UNIT PX  69  resource getDisplayMetrics       Hope that Helps

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There is a default util in android SDK  http   developer android com reference android util TypedValue html  float resultPix   TypedValue applyDimension TypedValue COMPLEX UNIT DIP 1 getResources   getDisplayMetrics

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like this   public class ScreenUtils        public static float dpToPx Context context  float dp            if  context    null                return -1                    return dp   context getResources   getDisplayMetrics   density             public static float pxToDp Context context  float px            if  context    null                return -1                    return px   context getResources   getDisplayMetrics   density            dependent on Context  return float value  static method  from  https   github com Trinea android-common blob master src cn trinea android common util ScreenUtils java L15

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Java code     Converts 14 dip into its equivalent px float dip   14f  Resources r   getResources    float px   TypedValue applyDimension      TypedValue COMPLEX UNIT DIP      dip      r getDisplayMetrics       Kotlin code   val dip   14f  val r  Resources   resources  val px   TypedValue applyDimension       TypedValue COMPLEX UNIT DIP       dip       r displayMetrics

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Probably the best way if you have the dimension inside values dimen is to get the dimension directly from getDimension   method  it will return you the dimension already converted into pixel value   context getResources   getDimension R dimen my dimension    Just to better explain this    getDimension int resourceId     will return the dimension already converted to pixel AS A FLOAT   getDimensionPixelSize int resourceId    will return the same but truncated to int  so AS AN  INTEGER   See Android reference

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The best answer comes from the Android framework itself  just use this equality     public static int dpToPixels final DisplayMetrics display metrics  final float dps        final float scale   display metrics density      return  int   dps   scale   0 5f        converts dp to px

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Preferably put in a Util java class       public static float dpFromPx final Context context  final float px        return px   context getResources   getDisplayMetrics   density     public static float pxFromDp final Context context  final float dp        return dp   context getResources   getDisplayMetrics   density

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If you can use the dimensions XML it s very simple   In your res values dimens xml    lt  xml version  1 0  encoding  utf-8   gt   lt resources gt       lt dimen name  thumbnail height  gt 120dp lt  dimen gt                   lt  resources gt    Then in your Java   getResources   getDimensionPixelSize R dimen thumbnail height

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float density   context getResources   getDisplayMetrics   density  float px   someDpValue   density  float dp   somePxValue   density    density equals    75 on ldpi  120 dpi   1 0 on mdpi  160 dpi  baseline  1 5 on hdpi  240 dpi  2 0 on xhdpi  320 dpi   3 0 on xxhdpi  480 dpi   4 0 on xxxhdpi  640 dpi     Use this online converter to play around with dpi values   EDIT   It seems there is no 1 1 relationship between dpi bucket and density  It looks like the Nexus 5X being xxhdpi has a density value of 2 625  instead of 3   See for yourself in the Device Metrics

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In case you developing a performance critical application  please consider the following optimized class   public final class DimensionUtils        private static boolean isInitialised   false      private static float pixelsPerOneDp          Suppress default constructor for noninstantiability      private DimensionUtils             throw new AssertionError               private static void initialise View view            pixelsPerOneDp   view getResources   getDisplayMetrics   densityDpi   160f          isInitialised   true             public static float pxToDp View view  float px            if   isInitialised                initialise view                      return px   pixelsPerOneDp             public static float dpToPx View view  float dp            if   isInitialised                initialise view                      return dp   pixelsPerOneDp

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A lot of great solutions above  However  the best solution I found is google s design   https   design google com devices

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More elegant approach using kotlin s extension function         Converts dp to pixel     val Int dpToPx  Int get      this   Resources getSystem   displayMetrics density  toInt           Converts pixel to dp     val Int pxToDp  Int get      this   Resources getSystem   displayMetrics density  toInt     Usage   println  16 dp in pixel    16 dpToPx    println  16 px in dp    16 pxToDp

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This should give you the conversion dp to pixels   public static int dpToPx int dp        return  int   dp   Resources getSystem   getDisplayMetrics   density       This should give you the conversion pixels to dp   public static int pxToDp int px        return  int   px   Resources getSystem   getDisplayMetrics   density

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MyviewHolder  holder  videoView setOnPreparedListener new MediaPlayer OnPreparedListener          Override     public void onPrepared final MediaPlayer mediaPlayer            mediaPlayer setLooping true             MyviewHolder  holder  spinnerView setVisibility View GONE           mediaPlayer setOnVideoSizeChangedListener new MediaPlayer OnVideoSizeChangedListener                 Override            public void onVideoSizeChanged MediaPlayer mp  int width  int height                                       add media controller                                  MediaController controller   new MediaController mContext                  float density   mContext getResources   getDisplayMetrics   density                 float px   55   density                    float dp   somePxValue   density                 controller setPadding 0  0  0   int   px                     MyviewHolder  holder  videoView setMediaController controller

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Without Context  elegant static methods   public static int dpToPx int dp        return  int   dp   Resources getSystem   getDisplayMetrics   density      public static int pxToDp int px        return  int   px   Resources getSystem   getDisplayMetrics   density

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To convert dp to pixel public static int dp2px Resources resource  int dp        return  int  TypedValue applyDimension          TypedValue COMPLEX UNIT DIP          dp resource getDisplayMetrics             To convert pixel to dp  public static float px2dp Resources resource  float px         return  float TypedValue applyDimension          TypedValue COMPLEX UNIT PX          px          resource getDisplayMetrics             where resource is context getResources

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This method converts dp unit to equivalent pixels  depending on device density           param dp A value in dp  density independent pixels  unit  Which we need to convert into pixels     param context Context to get resources and device specific display metrics     return A float value to represent px equivalent to dp depending on device density     public static float convertDpToPixel float dp  Context context       return dp     float  context getResources   getDisplayMetrics   densityDpi   DisplayMetrics DENSITY DEFAULT             This method converts device specific pixels to density independent pixels          param px A value in px  pixels  unit  Which we need to convert into db     param context Context to get resources and device specific display metrics     return A float value to represent dp equivalent to px value     public static float convertPixelsToDp float px  Context context       return px     float  context getResources   getDisplayMetrics   densityDpi   DisplayMetrics DENSITY DEFAULT

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For Xamarin Android  float DpToPixel float dp        var resources   Context Resources      var metrics   resources DisplayMetrics      return dp     float metrics DensityDpi    int DisplayMetricsDensity Default       Making this a non-static is necessary when you re making a custom renderer

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If you want Integer values then using Math round   will round the float to the nearest integer   public static int pxFromDp final float dp            return Math round dp   Resources getSystem   getDisplayMetrics   density

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PX and DP are different but similar   DP is the resolution when you only factor the physical size of the screen  When you use DP it will scale your layout to other similar sized screens with different pixel densities   Occasionally you actually want pixels though  and when you deal with dimensions in code you are always dealing with real pixels  unless you convert them   So on a android device  normal sized hdpi screen  800x480 is 533x320 in DP  I believe   To convert DP into pixels  1 5  to convert back  1 5  This is only for the one screen size and dpi  it would change depending on design  Our artists give me pixels though and I convert to DP with the above 1 5 equation

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using kotlin-extension makes it better   fun Int toPx context  Context   Int    this   context resources displayMetrics density  toInt    fun Int toDp context  Context   Int    this   context resources displayMetrics density  toInt     UPDATE   Because of displayMetrics is part of global shared Resources  we can use Resources getSystem    fun Int toPx    Int    this   Resources getSystem   displayMetrics density  toInt    fun Int toDp    Int    this   Resources getSystem   displayMetrics density  toInt

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private fun toDP context  Context value  Int   Int       return TypedValue applyDimension TypedValue COMPLEX UNIT DIP          value toFloat   context resources displayMetrics  toInt

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You can use this    without Context  public static int pxToDp int px        return  int   px   Resources getSystem   getDisplayMetrics   density      public static int dpToPx int dp        return  int   dp   Resources getSystem   getDisplayMetrics   density       As  Stan mentioned    using this approach may cause issue if system changes density  So be aware of that   Personally I am using Context to do that  It s just another approach I wanted to share you with

[android] Converting pixels to dp

Kotlin

Java

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