// https://stackoverflow.com/questions/19569546/background-service-without-activity
// https://fabcirablog.weebly.com/blog/creating-a-never-ending-background-service-in-android
// https://developerlife.com/2017/07/10/android-o-n-and-below-component-lifecycles-and-background-tasks/
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
SetContentView(Resource.Layout.activity_main);
Android.Support.V7.Widget.Toolbar toolbar = FindViewById <Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
SetSupportActionBar(toolbar);
_buttonRefresh = FindViewById <FloatingActionButton>(Resource.Id.fab);
_buttonRefresh.Visibility = ViewStates.Visible;
_buttonRefresh.Click += (s, e) => Update();
_logView = (TextView)FindViewById(Resource.Id.logtext);
_scrollView = (ScrollView)FindViewById(Resource.Id.scroller);
this.Info("Calling StartDroidNodeServiceIfNotRunning()...");
StartDroidNodeServiceIfNotRunning();
_nodeServiceConnection = new NodeServiceConnection();
this.Info("Calling BindService()...");
bool isBindServiceResultTrue = BindService(new Intent(this, typeof(NodeService)), _nodeServiceConnection, Bind.None);
if (!isBindServiceResultTrue)
{
this.Info("BindService() returned false, returning!");
return;
}
this.Info("BindService() returned true.");
}
void Update()
{
// TODO: move the linebuffer into the service,
// so that we can use the default activity mode. A new instance can then also Bind to the current generation of the service. Then, the reference to the bound service will not become invalid.
try
{
this.Info("Fetching log...");
NodeController controller = _nodeServiceConnection.NodeControllerFactory.Value;
if (controller != null)
{
var log = controller.GetLog();
if (!string.IsNullOrEmpty(log))
{
var oldText = _logView.Text;
var oldLines = CountLines(oldText);
if (oldLines > 200)
{
var shorter = DeleteLines(oldText, 100);
var newText = shorter + log;
_logView.Text = newText;
this.Info("Truncated log...");
}
else
{
_logView.Text = oldText + log;
}
_scrollView.FullScroll(FocusSearchDirection.Down);
}
}
}
catch (Exception e)
{
this.Info($"Error in Update(): {e.Message}");
}
finally
{
_nodeServiceConnection = null;
//GC.Collect(0);
}
}