H5+ App Android 获取顶层应用的包名

document.addEventListener('plusready', function() {
  var Context = plus.android.importClass("android.content.Context");
  var ActivityManager = plus.android.importClass("android.app.ActivityManager");
  var activityService = plus.android.runtimeMainActivity().getSystemService(Context.ACTIVITY_SERVICE);
  var task = activityService.getRunningTasks(1);
  var top = plus.android.invoke(task,"get",0);
  var topActivity = plus.android.getAttribute(top,"topActivity");
  var packageName = plus.android.invoke(topActivity,"getPackageName");
},false)