如何在Mono（Xamarin）中綁定到AccessibilityService

我試過並在ServiceConnection類中得到了OnServiceConnected事件。但是，如果我嘗試以「var myObject = IBinderObject as myBinderClass;」的形式將IBinder投射到我的類（它繼承了Binder，繼承IBinder），則返回null。或鑄造錯誤，如果我試圖做「var myObject =（myBinderClass）IBinderObject;」。請，任何工作示例...如何在Mono（Xamarin）中綁定到AccessibilityService

MainActivity代碼：

namespace MyApp.Droid 
{ 
    [Activity(Label = "MyApp", Icon = "@drawable/icon", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)] 
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity 
    { 
     AccessibilityServiceBinder binder; 
     AccessibilityServiceConnection accessibilityServiceConnection; 
     bool isBound = false, isBoundAC = false, isConfigurationChange = false; 
     protected Intent ServiceIntent; 
     AccessibilityServiceClass ServiceClass; 

     protected override void OnStart() 
     { 
      base.OnStart(); 
      if (!isBoundAC) 
      { 
       accessibilityServiceConnection = new AccessibilityServiceConnection(this); 
       isBoundAC = BindService(ServiceIntent, accessibilityServiceConnection, Bind.AutoCreate); 
       if (isBoundAC) 
       { 
       Toast.MakeText(this, "AccessibilityService is Bound", ToastLength.Long); 
       } 
      } 
     } 
     protected override void OnCreate(Bundle bundle) 
     { 
      base.OnCreate(bundle); 
      ServiceIntent = new Intent(this, typeof(AccessibilityServiceClass)); 
      ServiceIntent.SetPackage("android.accessibilityservice.AccessibilityService"); 
      global::Xamarin.Forms.Forms.Init(this, bundle); 
      LoadApplication(new App()); 
     } 
     public class AccessibilityServiceConnection : Java.Lang.Object, IServiceConnection 
     { 
      MainActivity activity; 
      AccessibilityServiceBinder binder; 
      public AccessibilityServiceBinder Binder 
      { 
       get 
       { 
       return (AccessibilityServiceBinder)binder; 
       } 
      } 
      public AccessibilityServiceConnection(MainActivity activity) 
      { 
       this.activity = activity; 
      } 
      public void OnServiceConnected(ComponentName name, IBinder service) 
      { 
       var accessibilityServiceBinder = service as AccessibilityServiceBinder; 
       //accessibilityServiceBinder is always null here 
       if (accessibilityServiceBinder != null) 
       { 
       activity.binder = accessibilityServiceBinder; 
       activity.isBound = true; 
       this.binder = accessibilityServiceBinder; 
       } 
      } 
      public void OnServiceDisconnected(ComponentName name) 
      { 
       activity.isBound = false; 
      } 
     } 
     public override Java.Lang.Object OnRetainNonConfigurationInstance() 
     { 
      base.OnRetainNonConfigurationInstance(); 
      isConfigurationChange = true; 
      return accessibilityServiceConnection; 
     } 
    } 
}

服務代碼：

namespace MyApp.Droid 
{ 
    [Service(Label = "MyApp", Permission = Manifest.Permission.BindAccessibilityService), IntentFilter(new[] { "android.accessibilityservice.AccessibilityService" }), MetaData("android.accessibility-service", Resource = "@xml/accessibilityserviceconfig")] 
    public class AccessibilityServiceClass : Android.AccessibilityServices.AccessibilityService 
    { 
     public override void OnAccessibilityEvent(AccessibilityEvent e) 
     { 
      Toast.MakeText(this, "OnAccessibilityEvent", ToastLength.Short); 
     } 

     public override void OnInterrupt() 
     { 
      Toast.MakeText(this, "OnInterrupt", ToastLength.Short); 
     } 

     protected override void OnServiceConnected() 
     { 
      Toast.MakeText(this, "OnServiceConnected", ToastLength.Short); 
     } 
    } 
    public class AccessibilityServiceBinder : Binder 
    { 
     AccessibilityServiceClass service; 

     public AccessibilityServiceBinder(AccessibilityServiceClass service) 
     { 
      this.service = service; 
     } 

     public AccessibilityServiceClass GetAccessibilityService() 
     { 
      return service; 
     } 
    } 
}

來源

2016-09-15 Gambolt

添加您的服務代碼 – Gusman

完成...謝謝。 – Gambolt

你是不是覆蓋服務的OnBind事件，因此粘合劑是空因爲你還沒有提供實例。

添加到您的服務：

AccessibilityServiceBinder binder; 

public override IBinder OnBind (Intent intent) 
{ 
    if(binder == null) 
     binder = new AccessibilityServiceBinder (this); 

    return binder; 
}

欲瞭解更多信息閱讀勢必服務Xamarin文檔，他們是很好的解釋：https://developer.xamarin.com/guides/android/application_fundamentals/services/part_2_-_bound_services/

編輯：總錯誤的答案（我將刪除它在幾分鐘內）。看起來無法綁定到Accessibility服務。更多的信息在這裏：android bind to AccessibilityService

來源

2016-09-16 12:02:41 Gusman

謝謝，但它表示，OnBind是密封的，不能被重寫... – Gambolt

AccessibilityServiceClass繼承Android.AccessibilityServices.AccessibilityService，而不是Android.App.Service – Gambolt

是的，我的錯，我看到內部實現創建一個IAccessibilityServiceClientWrapper（來源：https://sourcegraph.com/android.googlesource.com/platform/frameworks/base/-/info/JavaArtifact/AndroidSDK/-/android/accessibilityservice/AccessibilityService:type/onBind:android.content.Intent）so我認爲accesibility服務不應該被綁定，一些其他職位陳述這（http://stackoverflow.com/questions/9683927/android-bind-to-accessibilityservice） – Gusman

如何在Mono（Xamarin）中綁定到AccessibilityService

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