Android device info bridge for Unity 3D

DeviceInfo.java

package de.chimeraentertainment.tools;

import android.content.Context;
import android.view.WindowManager;
import de.chimeraentertainment.namespace.<<YourMainActivity>>;
import android.util.DisplayMetrics;
import android.util.Log;

public class DeviceInfo {

	/**
	 * Returns the rotation of the screen from its "natural" orientation
	 * @return  Surface.ROTATION_X enum
	 */
	public static int getScreenRotation()
	{
		// you should cache that return value in your unity script.
		return ((WindowManager)<<YourMainActivity>>.getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation();
	}
	
	
	/**
	 * Get Screensize in inches
	 * @return 0 if error, screensize in inch if no error
	 */
	public static double getScreenSizeInInch()
	{
        // Compute screen size
		try {
	        DisplayMetrics dm = <<YourMainActivity>>.getContext().getResources().getDisplayMetrics();
	        
	        float screenWidth  = dm.widthPixels / dm.xdpi;
	
	        float screenHeight = dm.heightPixels / dm.ydpi;
	
	        double size = Math.sqrt(Math.pow(screenWidth, 2) + Math.pow(screenHeight, 2));
	        
	        return size;
		} catch(Throwable t) {

	        Log.e("DeviceInfo", "Failed to compute screen size", t);

	        return 0;
	        
	    }

	}
	
}

DeviceInfoAndroidImpl.cs

using System;
using UnityEngine;

public class DeviceInfoAndroidImpl /* : IDeviceInfo // use an interface to implement it for ios as well */
{
    private const int IsTabletAboveInch = 4;
    private double screenSizeInch = -1;

    private bool _IsTabletSize()
    {
        return screenSizeInch >= IsTabletAboveInch;     
    }

    public int GetScreenRotation()
    {
#if UNITY_ANDROID
        int screenRot;
        
        Debug.Log("Calling IsTabletSize() on Java...");

        try
        {
            using (var javaDeviceInfo = new AndroidJavaClass("de.chimeraentertainment.tools.DeviceInfo"))
            {
                screenRot = javaDeviceInfo.CallStatic<int>("getScreenRotation");
            }
        }
        catch (Exception e)
        {
            Debug.LogError(e);
            return -1;
        }
        
        return screenRot;
#else
        return 0;
#endif
    }
    
    public bool IsTabletSize()
    {
#if UNITY_ANDROID
        // cache value, don't make too many jni calls!

        if (screenSizeInch > 0)
            return _IsTabletSize();

        Debug.Log("Calling IsTabletSize() on Java...");

        try
        {
            using (var javaDeviceInfo = new AndroidJavaClass("de.chimeraentertainment.tools.DeviceInfo"))
            {
                screenSizeInch = javaDeviceInfo.CallStatic<double>("getScreenSizeInInch");
            }
        }
        catch (Exception e)
        {
            Debug.LogError(e);
            return false;
        }

        return _IsTabletSize();
#else
        return false;
#endif

    }
}