Battery Intents

This section demonstrates how to collect battery information from the Magic Leap 2's Compute Pack and Controller in Unity. See the Android Intents Overview guide for information regarding the native implementation.

Controller Battery

This example returns Magic Leap's Controller battery level. Before reading the value, the example script checks the intent's extras to determine the Controller's connection state.

• If the connection to the Controller is active, the following extras will be set:
  • BatteryManager.EXTRA_PRESENT : true
  • BatteryManager.EXTRA_LEVEL : current Controller battery level (0-100)
  • BatteryManager.EXTRA_SCALE : 100
  • BatteryManager.EXTRA_BATTERY_LOW : true if the current level is 25% or lower, otherwise false
  • BatteryManager.EXTRA_STATUS : BatteryManager.BATTERY_STATUS_CHARGING or BatteryManager.BATTERY_STATUS_NOT_CHARGING, based on the Controller charger connection state
• If the connection to the Controller is not active, the following extras will be set:
  • BatteryManager.EXTRA_PRESENT : false
  • BatteryManager.EXTRA_STATUS : BatteryManager.BATTERY_STATUS_UNKNOWN

public static int GetControllerBatteryState()
{
#if PLATFORM_ANDROID && !UNITY_EDITOR
      using AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
      AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
      if (activity == null)
      {
        Utils.LogError("Activity is null");
        return -1;
      }

      using AndroidJavaObject filter = new AndroidJavaObject("android.content.IntentFilter");
      if (filter == null)
      {
        Utils.LogError("IntentFilter is null");
        return -1;
      }
      
      filter.Call("addAction", "com.magicleap.controller.action.BATTERY_CHANGED");
      
      using AndroidJavaObject intent = activity.Call<AndroidJavaObject>("registerReceiver", null, filter);
      if (intent == null)
      {
        Utils.LogError("Intent is null");
        return -1;
      }

      using AndroidJavaClass batteryManager = new AndroidJavaClass("android.os.BatteryManager");
      if (batteryManager == null)
      {
        Utils.LogError("BatteryManager is null");
        return -1;
      }
      string EXTRA_PRESENT = batteryManager.GetStatic<string>("EXTRA_PRESENT");
      string EXTRA_LEVEL = batteryManager.GetStatic<string>("EXTRA_LEVEL");
      bool isPresent = intent.Call<bool>("getBooleanExtra", EXTRA_PRESENT, false);
      return isPresent ? intent.Call<int>("getIntExtra", EXTRA_LEVEL, -1) : -1;
#else
    return -1;
#endif
}

Compute Pack

The compute pack's battery level can be obtained using standard Android APIs. In Unity, this can be done using the SystemInfo class.

  //This will return the compute pack battery level
  float batteryLevel = SystemInfo.batteryLevel;