In my Unity3D application for android I need to start a service, which will run in background. I can't figure it out how can I do it. The method startService() has to be invoked on an activity, but I do not know how to pass the current unity activity from unity script to my android plugin. And I haven't found any way to get the activity in a static method and run startService() in it.
As far as I understand the sequence, I need to get main Unity3D activity and start the service from it.
My class which is supposed to call the service.
public final class StatusCheckStarter { public static void StartCheckerService() { startService(new Intent(this, CheckService.class)); } }
This code does not work, because "Cannot resolve method startService" and I have nothing to pass in this argument. I need to get the current activity.
Below are two ways to send Activity instance/reference to Java plugin that doesn't use the onCreate function or extend from UnityPlayerActivity.
Method 1: Send Activity reference once then store it in a static variable in Java for re-usual:
Java:
public final class StatusCheckStarter { static Activity myActivity; // Called From C# to get the Activity Instance public static void receiveActivityInstance(Activity tempActivity) { myActivity = tempActivity; } public static void StartCheckerService() { myActivity.startService(new Intent(myActivity, CheckService.class)); } }
C#:
AndroidJavaClass unityClass; AndroidJavaObject unityActivity; AndroidJavaClass customClass; void Start() { //Replace with your full package name sendActivityReference("com.example.StatusCheckStarter"); //Now, start service startService(); } void sendActivityReference(string packageName) { unityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"); unityActivity = unityClass.GetStatic("currentActivity"); customClass = new AndroidJavaClass(packageName); customClass.CallStatic("receiveActivityInstance", unityActivity); } void startService() { customClass.CallStatic("StartCheckerService"); }
Method 2: Send Activity reference in each function call.
Java:
public final class StatusCheckStarter { public static void StartCheckerService(Activity tempActivity) { tempActivity.startService(new Intent(tempActivity, CheckService.class)); } }
C#:
void Start() { //Replace with your full package name startService("com.example.StatusCheckStarter"); } void startService(string packageName) { AndroidJavaClass unityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"); AndroidJavaObject unityActivity = unityClass.GetStatic("currentActivity"); AndroidJavaClass customClass = new AndroidJavaClass(packageName); customClass.CallStatic("StartCheckerService", unityActivity); }
Note: You must replace com.example.StatusCheckStarter with the full package of your StatusCheckStarter class.
