如何为后台工作创建绑定服务（Xamarin）
I need a service which will work on background mode.Im successful create a Start service, but he dies when im close the app. Im trying to create a bound service to resolve this problem
我需要一个可以在后台模式下工作的服务。我成功创建了一个Start服务，但是当我关闭应用程序时他就死了。我试图创建一个绑定服务来解决这个问题
var demoServiceIntent = new Intent (this, typeof(MyService));
var demoServiceConnection = new MyBinder (this);
ApplicationContext.BindService (demoServiceIntent, demoServiceConnection, Bind.AutoCreate)
What i need to write in this method:
我需要用这种方法写一下：
public override IBinder OnBind (Intent intent)
{
return null;
}
Here is the full code:
这是完整的代码：
[Activity (Label = "really", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
public Communicator communicator;
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
SetContentView (Resource.Layout.BlueTooth);
communicator = new Communicator (this);
var messageButton = FindViewById<Button> (Resource.Id.messageButton);
messageButton.Click += delegate(object sender, EventArgs e) {
communicator.SendMessage ("time: " + DateTime.Now.ToString ("T"));
};
communicator.MessageReceived += message => RunOnUiThread (() => messageButton.Text = message);
var dataButton = FindViewById<Button> (Resource.Id.dataButton);
dataButton.Click += delegate {
var dataMap = new DataMap ();
dataMap.PutString ("time", DateTime.Now.ToString ("T"));
communicator.SendData (dataMap);
};
communicator.DataReceived += dataMap => RunOnUiThread (() => dataButton.Text = dataMap.ToString ());
var demoServiceIntent = new Intent (this, typeof(MyService));
var demoServiceConnection = new MyBinder (this);
ApplicationContext.BindService (demoServiceIntent, demoServiceConnection, Bind.AutoCreate);
}
protected override void OnResume ()
{
base.OnResume ();
communicator.Resume ();
}
protected override void OnPause ()
{
communicator.Pause ();
base.OnPause ();
}
protected override void OnStart ()
{
base.OnStart ();
}
}
[Service]
[IntentFilter (new String[]{ "com.xamarin.MyService" })]
public class MyService : Service
{
Context mContext;
public MyService ()
{
mContext = Android.App.Application.Context;
}
[Obsolete ("deprecated")]
public override StartCommandResult OnStartCommand (Intent intent, StartCommandFlags flags, int startId)
{
return StartCommandResult.Sticky;
}
#region implemented abstract members of Service
public override IBinder OnBind (Intent intent)
{
return null;
}
#endregion
public override void OnDestroy ()
{
base.OnDestroy ();
// cleanup code
}
}
public class MyBinder : Java.Lang.Object, IServiceConnection
{
private Context mnContext;
public MyBinder ()
{
mnContext = Android.App.Application.Context;
}
public MyBinder (Context context)
{
mnContext = context;
}
#region IServiceConnection implementation
public void OnServiceConnected (ComponentName name, IBinder service)
{
}
public void OnServiceDisconnected (ComponentName name)
{
}
#endregion
}
1 个解决方案
#1
4
OnBind should return an instance of the binder, or MyBinder in your case. Your binder is implementing a ServiceConnection when it should be inheriting from Binder instead. The ServiceConnection is another piece of the puzzle. Your binder should look something like this:
OnBind应该返回绑定器的实例，或者在你的情况下返回MyBinder。当它应该从Binder继承时，你的绑定器正在实现一个ServiceConnection。 ServiceConnection是另一个难题。你的活页夹应该是这样的：
public class MyServiceBinder : Binder
{
private readonly MyService _service;
public DemoServiceBinder(MyService service)
{
_service = service;
}
public MyService GetMyService()
{
return _service;
}
}
I suggest reading this 3 part tutorial at Xamarin which covers the Android Bound Services topic very well.
我建议在Xamarin上阅读这个3部分的教程，它非常清楚地介绍了Android绑定服务主题。