Unity Android Sensor Plugin

Unity plugin for using Android sensors.

Usage

See also: ExampleBehaviour/SensorBehaviour.cs.

Add plugin jar file to Unity Assets

Download AndroidSensorPlugin.jar and put it into Unity Assets folder ( Assets/Plugins/Android/AndroidSensorPlugin.jar ).

Add codes to script

Add these codes to your Behaviour script, and they initialize the plugin.

using UnityEngine;

...

        private AndroidJavaObject plugin;

        void Start ()
        {
#if UNITY_ANDROID
                plugin = new AndroidJavaClass("jp.kshoji.unity.sensor.UnitySensorPlugin").CallStatic<AndroidJavaObject>("getInstance");
#endif
        }

        void OnApplicationQuit ()
        {
#if UNITY_ANDROID
		if (plugin != null) {
			plugin.Call("terminate");
			plugin = null;
		}
#endif
	}

To use accelerometer sensor, add these lines on the Start method.

#if UNITY_ANDROID
        if (plugin != null) {
                plugin.Call("startSensorListening", "accelerometer");
        }
#endif

To get sensor values, add these lines on Update method.

#if UNITY_ANDROID
	if (plugin != null) {
		float[] sensorValue = plugin.Call<float[]>("getSensorValues", "accelerometer");
	}
#endif

Tips

If the app want to read sensor values more frequently, call setSamplingPeriod plugin method. The argument is in micro seconds.

	plugin.Call("setSamplingPeriod", 1000); // refreshes sensor 1 milli second each

And then, call InvokeRepeating(string methodName, float time, float repeatRate) method on Unity Behaviour's Start method. This makes enable more frequently method calling than game FPS.

        void Start ()
        {
                ... initializations here ...
                
                // wait 1.0 second, and call `CheckSensor` method at 1000Hz (1/0.001 Hz)
                InvokeRepeating("CheckSensor", 1.0f, 0.001f);
        }

        void CheckSensor ()
        {
#if UNITY_ANDROID
                if (plugin != null) {
                        float[] sensorValue = plugin.Call<float[]>("getSensorValues", "accelerometer");
                }
#endif
        }

Available Sensors

• accelerometer
• ambienttemperature
• gamerotationvector
• geomagneticrotationvector
• gravity
• gyroscope
• gyroscopeuncalibrated
• heartrate
• light
• linearacceleration
• magneticfield
• magneticfielduncalibrated
• pressure
• proximity
• relativehumidity
• rotationvector
• significantmotion
• stepcounter
• stepdetector