public void UseDemo()
{
StartActivity("com.xxx.xxx.DemoActivity");
}
public void StartActivity(string activityName)
{
var unity = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
var currentActivity = unity.GetStatic<AndroidJavaObject>("currentActivity");
var intentObj = new AndroidJavaObject("android.content.Intent");
var activityCls = new AndroidJavaClass(activityName);
intentObj.Call<AndroidJavaObject>("setClass", currentActivity, activityCls);
currentActivity.Call("startActivity", intentObj);
}