How to determine the screen width in terms of dp or dip at runtime in Android

Question

I need to code the layout of the android widgets using dip dp  in java files   At runtime if I code      int pixel this getWindowManager   getDefaultDisplay   getWidth     this return the screen width in pixels  px   To convert this to dp  I coded              int dp  pixel  int getResources   getDisplayMetrics   density   This does not seem to be returning correct answer  I made the emulator of WVGA800 whose screen resolution is 480 by 800  When the run the emulator and let the code print the values of pixel and dp  it came to 320 in both  This emulator is 240 dpi whose scale factor would be 0 75

User · Answer

Try this   Display display     getWindowManager   getDefaultDisplay    Point displaySize   new Point    display getSize displaySize   int width    displaySize x  int height   displaySize y

User · Answer

Get Screen Width and Height in terms of DP with some good decoration   Step 1  Create interface  public interface ScreenInterface       float getWidth        float getHeight         Step 2  Create implementer class  public class Screen implements ScreenInterface       private Activity activity       public Screen Activity activity            this activity   activity             private DisplayMetrics getScreenDimension Activity activity            DisplayMetrics displayMetrics   new DisplayMetrics            activity getWindowManager   getDefaultDisplay   getMetrics displayMetrics           return displayMetrics             private float getScreenDensity Activity activity            return activity getResources   getDisplayMetrics   density              Override     public float getWidth             DisplayMetrics displayMetrics   getScreenDimension activity           return displayMetrics widthPixels   getScreenDensity activity               Override     public float getHeight             DisplayMetrics displayMetrics   getScreenDimension activity           return displayMetrics heightPixels   getScreenDensity activity              Step 3  Get width and height in activity   Screen screen   new Screen this      Setting Screen screen getWidth    screen getHeight

User · Answer

You are missing default density value of 160       2 px   3 dip if dpi    80 ldpi   320x240 screen     1 px   1 dip if dpi    160 mdpi   480x320 screen     3 px   2 dip if dpi    240 hdpi   840x480 screen   In other words  if you design you layout with width equal to 160dip in portrait mode  it will be half of the screen on all ldpi mdpi hdpi devices except tablets  I think

User · Answer

This is a copy pastable function to be used based on the previous responses                param context         return the Screen height in DP             public static float getHeightDp Context context            DisplayMetrics displayMetrics   context getResources   getDisplayMetrics            float dpHeight   displayMetrics heightPixels   displayMetrics density          return dpHeight                         param context         return the screnn width in dp             public static float getWidthDp Context context            DisplayMetrics displayMetrics   context getResources   getDisplayMetrics            float dpWidth   displayMetrics widthPixels   displayMetrics density          return dpWidth

User · Answer

Answer in kotlin     context  let           val displayMetrics   it resources displayMetrics         val dpHeight   displayMetrics heightPixels   displayMetrics density         val dpWidth   displayMetrics widthPixels   displayMetrics density

User · Answer

DisplayMetrics displayMetrics   new DisplayMetrics     getWindowManager   getDefaultDisplay   getMetrics displayMetrics    int width px   Resources getSystem   getDisplayMetrics   widthPixels   int height px  Resources getSystem   getDisplayMetrics   heightPixels   int pixeldpi   Resources getSystem   getDisplayMetrics   densityDpi    int width dp    width px pixeldpi  160  int height dp    height px pixeldpi  160

User · Answer

Try this  Display display   getWindowManager   getDefaultDisplay    DisplayMetrics outMetrics   new DisplayMetrics     display getMetrics outMetrics    float density    getResources   getDisplayMetrics   density  float dpHeight   outMetrics heightPixels   density  float dpWidth    outMetrics widthPixels   density    OR  Thanks  Tom     Hub  lek  DisplayMetrics displayMetrics   context getResources   getDisplayMetrics        float dpHeight   displayMetrics heightPixels   displayMetrics density  float dpWidth   displayMetrics widthPixels   displayMetrics density

User · Answer

I stumbled upon this question from Google  and later on I found an easy solution valid for API    13   For future references   Configuration configuration   yourActivity getResources   getConfiguration    int screenWidthDp   configuration screenWidthDp    The current width of the available screen space  in dp units  corresponding to screen width resource qualifier  int smallestScreenWidthDp   configuration smallestScreenWidthDp    The smallest screen size an application will see in normal operation  corresponding to smallest screen width resource qualifier    See Configuration class reference  Edit  As noted by Nick Baicoianu  this returns the usable width height of the screen  which should be the interesting ones in most uses   If you need the actual display dimensions stick to the top answer

User · Answer

How about using this instead    final DisplayMetrics displayMetrics getResources   getDisplayMetrics    final float screenWidthInDp displayMetrics widthPixels displayMetrics density  final float screenHeightInDp displayMetrics heightPixels displayMetrics density

User · Answer

Simplified for Kotlin   val widthDp   resources displayMetrics run   widthPixels   density   val heightDp   resources displayMetrics run   heightPixels   density

User · Answer

If you just want to know about your screen width  you can just search for  smallest screen width  in your developer options  You can even edit it

User · Answer

Your problem is with casting the float to an int  losing precision  You should also multiply with the factor and not divide   Do this   int dp    int  pixel getResources   getDisplayMetrics   density

[android] How to determine the screen width in terms of dp or dip at runtime in Android?

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