GettingResolutionStringJNI

CallJavaCode.cs

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;
using System;

public class DisplayManagerJNI : MonoBehaviour {
	private IntPtr JavaClass;
	private string getResolution;
	void Start ()
	{
		JavaVM.AttachCurrentThread();

		IntPtr cls_Activity	= JNI.FindClass("com/unity3d/player/UnityPlayer");
		int fid_Activity	= JNI.GetStaticFieldID(cls_Activity, "currentActivity", "Landroid/app/Activity;");
		IntPtr obj_Activity	= JNI.GetStaticObjectField(cls_Activity, fid_Activity);
		
		IntPtr cls_JavaClass	= JNI.FindClass("com/nival/DisplayManager/DisplayManager");
		int mid_JavaClass		= JNI.GetMethodID(cls_JavaClass, "<init>", "(Landroid/app/Activity;)V");
		IntPtr obj_JavaClass	= JNI.NewObject(cls_JavaClass, mid_JavaClass, obj_Activity);

		JavaClass			= JNI.NewGlobalRef(obj_JavaClass);
		getResolution	= JNI.GetMethodID(cls_JavaClass, "GetResolution", "()Ljava/lang/String;");

	}
	
	public string GetResolution()
	{
		JavaVM.AttachCurrentThread();
		String str_cacheDir = JNI.CallObjectMethod(JavaClass, getResolution);
		IntPtr stringPtr = JNI.GetStringUTFChars(str_cacheDir, 0);
		String resolutionString = Marshal.PtrToStringAnsi(stringPtr);
		JNI.ReleaseStringUTFChars(str_cacheDir, stringPtr);
		return resolutionString;
	}
}