Android Example Get real display size in inch

Hello,

Maybe this can be useful for others.
You can get the exact screen diagonal size (in inch) using the following simple routine.

Sub GetDevicePhysicalSize As Double
#If JAVA
import android.graphics.*;
import android.util.DisplayMetrics;
public double getScreenSizeOfDevice() {
    Point point = new Point();
    getWindowManager().getDefaultDisplay().getRealSize(point);
    DisplayMetrics dm = getResources().getDisplayMetrics();
    double x = Math.pow(point.x/ dm.xdpi, 2);
    double y = Math.pow(point.y / dm.ydpi, 2);
    double screenInches = Math.sqrt(x + y);
    return screenInches;
}
#End If
    Return NativeMe.RunMethod("getScreenSizeOfDevice", Null)
End Sub

Tested on Android 4.4 (LG GPad 8.3), 5.1 (Xperia ZL), 11 (Lenovo Yoga Tab 13) and 12 (Pixel 3a) with perfect results.

 

[swChef]

Thank you.
In B4A, define NativeMe as

Dim NativeMe As JavaObject
NativeMe.InitializeContext

 

[Star-Dust]

Sub GetRealHeight As Int
   Dim p As Phone
   If p.SdkVersion >= 17 Then
     Dim jo As JavaObject
     jo = jo.InitializeContext.RunMethodJO("getWindowManager", Null).RunMethod("getDefaultDisplay", Null)
     Dim metrics As JavaObject
     metrics.InitializeNewInstance("android.util.DisplayMetrics", Null)
     jo.RunMethod("getRealMetrics", Array(metrics))
     Return metrics.GetField("heightPixels")
   Else
     Return GetDeviceLayoutValues.Height
   End If
End Sub

Or

    Dim r As Reflector
    r.Target = r.GetContext
    r.Target = r.RunMethod("getResources")
    r.Target = r.RunMethod("getDisplayMetrics")
    Log(r.GetField("xdpi"))
    Log(r.GetField("ydpi"))
    
    Log(GetDeviceLayoutValues.Width/r.GetField("xdpi"))
    Log(GetDeviceLayoutValues.Height/r.GetField("ydpi"))

 

[Pendrush]

You should be careful.

getter for defaultDisplay: Display!' is deprecated. Deprecated in Java (Api 31)

android.view.WindowManager @Deprecated
public abstract android.view.Display getDefaultDisplay()

 

[yo3ggx]

Thank you.
In B4A, define NativeMe as

Dim NativeMe As JavaObject
NativeMe.InitializeContext

Yes, as usual with inline Java code.

 

[yo3ggx]

You should be careful.

getter for defaultDisplay: Display!' is deprecated. Deprecated in Java (Api 31)

Good point. Looks like is deprecated from Api 30.
https://developer.android.com/reference/android/view/WindowManager
... but .. is working perfect on Pixel 3a with Android 12 (API 31).
I'm using android.jar from API 30 and android:targetSdkVersion="30".