How to create Android Handler in a Java plugin called from Unity

Question

So, let's say you have a Unity Java plugin, you call into the Java plugin like so

private static readonly AndroidJavaClass m_somePlugin = new AndroidJavaClass("com.unity3d.Plugin.blah.SomePlugin");

using (var unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
{
    using (var currentActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity"))
    {
        m_somePlugin.CallStatic("onInitialise", currentActivity);
    }
}

and the plugin looks something like this

public class SomePlugin 
{
    static public void onInitialise(final Activity currentActivity) 
    {
        Handler someHandler = new Handler();
    }
}

All quite simple. Except it will crash. Creating a Handler is the cause. I'm guessing it's a thread issue.

So the question is, how does one create a handler in a Java plugin, in the activity that I'm passing in? Anyone know?

looks like currentActivity.runOnUiThread may be the way to go. I'll try it and report on here if it is successful. — Haze
– Haze, Commented Nov 12, 2012 at 16:10

Haze · Accepted Answer · 2012-11-12 16:24:46Z

1

Yes, the solution to the problem was to use runOnUiThread. So in order to get the above code to not crash SomePlugin should look like so

public class SomePlugin 
{
    static public void onInitialise(final Activity currentActivity) 
    {
        currentActivity.runOnUiThread(new Runnable() {
            Handler someHandler = new Handler(); });
    }
}

answered Nov 12, 2012 at 16:24

Haze

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