When I run my plugin onSensorChanged won't trigger, leaving me without any information from the sensors.

Here is my Java Class code:

package com.skanska.helloandroid;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;


public class HelloAndroidActivity extends Activity implements SensorEventListener{

private SensorManager mSensorManager;
private float[] mGData = new float[3];
private float[] mMData = new float[3];
private float[] mR = new float[16];
private float[] mI = new float[16];
private float[] mOrientation = new float[3];
private Sensor msensor, gsensor;

public float deg = 0;
private String degString;

public HelloAndroidActivity(Activity currentActivity) {
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

gsensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
msensor = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

mSensorManager.registerListener(this, gsensor, SensorManager.SENSOR_DELAY_GAME);
mSensorManager.registerListener(this, msensor, SensorManager.SENSOR_DELAY_GAME);
}

public void onAccuracyChanged(Sensor sensor, int accuracy) {
}

public void onSensorChanged(SensorEvent event) {        

int type = event.sensor.getType();
if (type == Sensor.TYPE_ACCELEROMETER) {

for (int i=0 ; i<3 ; i++)
mGData[i] = event.values[i];

}
else if (type == Sensor.TYPE_MAGNETIC_FIELD) {

for (int i=0 ; i<3 ; i++)
mMData[i] = event.values[i];

} 
else {
return;
}

SensorManager.getRotationMatrix(mR, mI, mGData, mMData);

SensorManager.getOrientation(mR, mOrientation);

final float radtodeg = (float)(180.0f/Math.PI);
deg = mOrientation[0]*radtodeg;
}

public String getDeg(){
degString = Float.toString(deg);
return degString;
}    
}

My javabridge(.cpp):

include <stdlib.h>
include <jni.h>
include <android/log.h>

extern "C"
{

JavaVM* java_vm;
jobject HelloAndroidActivity;
jmethodID getDeg;

jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
java_vm = vm;

JNIEnv* jni_env = 0;
java_vm->AttachCurrentThread(&jni_env, 0);

jclass cls_Activity = jni_env->FindClass("com/unity3d/player/UnityPlayer");
jfieldID fid_Activity = jni_env->GetStaticFieldID(cls_Activity, "currentActivity", "Landroid/app/Activity;");
jobject obj_Activity = jni_env->GetStaticObjectField(cls_Activity, fid_Activity);

jclass cls_HelloAndroidActivity = jni_env->FindClass("com/skanska/helloandroid/HelloAndroidActivity");
jmethodID mid_HelloAndroidActivity = jni_env->GetMethodID(cls_HelloAndroidActivity, "<init>", "(Landroid/app/Activity;)V");
jobject obj_HelloAndroidActivity = jni_env->NewObject(cls_HelloAndroidActivity, mid_HelloAndroidActivity, obj_Activity);

HelloAndroidActivity = jni_env->NewGlobalRef(obj_HelloAndroidActivity);
getDeg = jni_env->GetMethodID(cls_HelloAndroidActivity, "getDeg", "()Ljava/lang/String;");

return JNI_VERSION_1_6;
}

char* dec = 0;
const char* getDeclination()
{


JNIEnv* jni_env = 0;
java_vm->AttachCurrentThread(&jni_env, 0);

jstring str_dec = (jstring)jni_env->CallObjectMethod(HelloAndroidActivity, getDeg);

jsize stringLen = jni_env->GetStringUTFLength(str_dec);

dec = new char[stringLen+1];

const char* content = jni_env->GetStringUTFChars(str_dec, 0);

strcpy(dec, content);

return dec;
}
}

My C# Call javacode script:

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

public class CallJavaCode : MonoBehaviour {


[DllImport("javabridge")]
private static extern IntPtr getDeclination();



public float   deg;
private string decString;



IntPtr stringPtr = getDeclination();

void Start ()
{
stringPtr=getDeclination();
Debug.Log("stringPtr = " +stringPtr);
String cache = Marshal.PtrToStringAnsi(stringPtr);
Debug.Log("getDeclination returned " + cache);
decString = cache;

deg = float.Parse(decString);   

Debug.Log("Deg= " + deg);
transform.eulerAngles = new Vector3(0, 0, deg);
    }
void Update()
    {
stringPtr = getDeclination();
Debug.Log("stringPtr = " +stringPtr);
String cache = Marshal.PtrToStringAnsi(stringPtr);
Debug.Log("getDeclination returned " + cache);
decString = cache;

deg = float.Parse(decString);

transform.eulerAngles = new Vector3(0, 0, deg);
Debug.Log("Deg = " + deg);   
    }  

void OnGUI ()
{
GUI.Label(new Rect (15, 125, 450, 100), decString);     
}
}

I might aswell post my manifest since I have no clue what so ever manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.skanska.helloandroid"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="11" />

<application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">
<activity android:name=".HelloAndroidActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>
</manifest>

Am I missing something obvious? Is it even possible to make a event based plugin?

Thanks in advance,

Martin