DPI for Android

[Abe _King_Participant]

SDL2, or the current version used in Monkey2, does not support DPI for Android. So if you’ve been frustrated trying to come up with a solution but weren’t satisfied, this is the way to go!

Why would I want this?
Because you can now have elements displayed at the same size across desktops and Android (unsure about ios) based on inches instead of pixels – which is important in itself, and even more important with UI.

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Java File

Java

package com.monkey2.lib; import android.util.DisplayMetrics; import android.view.WindowManager; public class DisplayUtility { private static final String TAG = "DisplayUtility"; static public int getDPI( boolean vertical ) { DisplayMetrics metrics = new DisplayMetrics(); Monkey2Activity.mSingleton.getWindowManager().getDefaultDisplay().getMetrics(metrics); if( vertical ){ return (int)metrics.ydpi; } else { return (int)metrics.xdpi; } } }

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package com.monkey2.lib;   import android.util.DisplayMetrics; import android.view.WindowManager;   public class DisplayUtility {     private static final String TAG = "DisplayUtility";          static public int getDPI( boolean vertical ) {     DisplayMetrics metrics = new DisplayMetrics();         Monkey2Activity.mSingleton.getWindowManager().getDefaultDisplay().getMetrics(metrics);                  if( vertical ){             return (int)metrics.ydpi;         } else {             return (int)metrics.xdpi;         }     }      }

Store the Java file somewhere logical in your app. Say in a folder called “native”. The floats are cast to ints for the time being. There aren’t externs for float methods in Monkey2 at this time.

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Monkey 2 Implementation

Monkey

#If __TARGET__="android" #Import "src/native/DisplayUtility.java" #End #Import "<sdl2>" Using std.. Using sdl2.. #If __TARGET__="android" #Rem monkeydocs Returns the vertical(true) or horizontal(false) DPI for Android. #End Function GetDPI:Int( vertical:Bool ) Local env:=sdl2.Android_JNI_GetEnv() Local cls:=env.FindClass( "com/monkey2/lib/DisplayUtility" ) Local mth:=env.GetStaticMethodID( cls, "getDPI", "(Z)I" ) Return env.CallStaticIntMethod( cls, mth, New Variant[]( vertical ) ) End #Else Function GetDPI:Int( vertical:Bool ) Return 0 End #Endif

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#If __TARGET__="android" #Import "src/native/DisplayUtility.java" #End #Import "<sdl2>"   Using std.. Using sdl2..         #If  __TARGET__="android" #Rem monkeydocs Returns the vertical(true) or horizontal(false) DPI for Android. #End Function GetDPI:Int( vertical:Bool ) Local env:=sdl2.Android_JNI_GetEnv() Local cls:=env.FindClass( "com/monkey2/lib/DisplayUtility" ) Local mth:=env.GetStaticMethodID( cls, "getDPI", "(Z)I" ) Return env.CallStaticIntMethod( cls, mth, New Variant[]( vertical ) ) End #Else Function GetDPI:Int( vertical:Bool ) Return 0 End #Endif

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How To Use it

Monkey

Function Main() Local hdpi:Float Local vdpi:Float Local result:= SDL_GetDisplayDPI(0, Null, Varptr(hdpi), Varptr(vdpi)) ' SDL fails if not 0, so use our backup plan If result<>0 Then vdpi = GetDPI( True ) hdpi = GetDPI( False ) End End

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Function Main() Local hdpi:Float Local vdpi:Float Local result:= SDL_GetDisplayDPI(0, Null, Varptr(hdpi), Varptr(vdpi))                 ' SDL fails if not 0, so use our backup plan If result<>0 Then vdpi = GetDPI( True ) hdpi = GetDPI( False ) End   End

[therevillsParticipant]

Cool! Didnt know you could use Java in the externs for Monkey2!

[AmonParticipant]

Yep, deffo cool.

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