[mono-android] Custom Application Object

[Morten Nilsen]

Hi,
You will need to add this constructor to your class:

Public MyApp(IntPtr handle)
  : base(handle)
{
}

This is due to the code path from C# to Java and the two runtime environments.

  -- Regards, Morten

From: monodroid-bounces at lists.ximian.com [mailto:monodroid-bounces at lists.ximian.com] On Behalf Of BernhardGessler at cs-ag.de
Sent: Monday, March 21, 2011 3:14 PM
To: monodroid at lists.ximian.com
Cc: HagenBackhaus at cs-ag.de
Subject: [mono-android] Custom Application Object


Hi,

i am, trying to have my own application object:

using Android.App;

namespace CSMobile.UI
{
    [Application()]
    class MyApp : Application
    {
        private string _test;

        public string Test
        {
            get { return _test; }
            set { _test = value; }
        }

        public override void OnCreate()
        {
            base.OnCreate();

            Program_Logic logic = new Program_Logic();
            logic.LoadConfig(this);
        }
    }
}


But when i start the Application the following error throws:

03-21 15:03:43.280  5877  5877 I MonoDroid: UNHANDLED EXCEPTION: System.NotSupportedException: Unable to activate instance of type CSMobile.UI.MyApp from native handle 459ebe48 ---> System.MissingMethodException: No constructor found for CSMobile.UI.MyApp::.ctor(System.IntPtr)
03-21 15:03:43.280  5877  5877 I MonoDroid:   at Android.Runtime.TypeManager.CreateProxy (System.Type type, IntPtr handle) [0x00000] in <filename unknown>:0
03-21 15:03:43.280  5877  5877 I MonoDroid:   at Android.Runtime.TypeManager.CreateInstance (IntPtr handle, System.Type targetType) [0x00000] in <filename unknown>:0
03-21 15:03:43.280  5877  5877 I MonoDroid:   --- End of inner exception stack trace ---
03-21 15:03:43.280  5877  5877 I MonoDroid: at Android.Runtime.TypeManager.CreateInstance (intptr,System.Type) <0x0057c>
03-21 15:03:43.280  5877  5877 I MonoDroid: at Java.Lang.Object.GetObject (intptr,System.Type,bool) <0x00223>
03-21 15:03:43.280  5877  5877 I MonoDroid: at Java.Lang.Object._GetObject<Android.App.Application> (intptr,bool) <0x0004f>
03-21 15:03:43.280  5877  5877 I MonoDroid: at Java.Lang.Object.GetObject<Android.App.Application> (intptr,bool) <0x0002b>
03-21 15:03:43.280  5877  5877 I MonoDroid: at Android.App.Application.n_OnCreate (intptr,intptr) <0x00023>
03-21 15:03:43.280  5877  5877 I MonoDroid: at (wrapper dynamic-method) object.e64d49ee-e048-4001-b616-2396f819a424 (intptr,intptr) <0x0002b>

If I remove the OnCreate Method my app starts without crashing. But it crashes with the same exception as soon as i call

this.ApplicationContext

in one of my activities.

Thaks for your help in advance

Bernhard Geßler
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