onPreated（）onPause（）和onStop（）之间的活动

Question

我无法可靠地退出我的应用程序中的活动。当我按下设备上的“后退”按钮或者我从按钮单击呼叫finish()时，活动显然是随机重新启动。

示例活动：

[Activity(Label = "abc", ParentActivity = typeof(MainActivity))] 
public class ImpressumActivity : Activity 
{ 
    private static int _instancecounter; 
    private int _thisinstance; 
    protected override void OnCreate(Bundle bundle) 
    { 
     _thisinstance = _instancecounter++; 
     Console.WriteLine("Creating instance {0}", _thisinstance); 
     base.OnCreate(bundle); 
     SetContentView(Resource.Layout.Impressum); 
     Console.WriteLine("Created instance {0}", _thisinstance); 
    } 

    public override void Finish() 
    { 
     Console.WriteLine("Finishing instance {0}", _thisinstance); 
     base.Finish(); 
     Console.WriteLine("Finished instance {0}", _thisinstance); 
    } 

    protected override void OnStop() 
    { 
     Console.WriteLine("Stopping instance {0}", _thisinstance); 
     base.OnStop(); 
     Console.WriteLine("Stopped instance {0}", _thisinstance); 
    } 

    protected override void OnPause() 
    { 
     Console.WriteLine("Pausing instance {0}", _thisinstance); 
     base.OnPause(); 
     Console.WriteLine("Paused instance {0}", _thisinstance); 
    } 

    protected override void OnDestroy() 
    { 
     Console.WriteLine("Destroying instance {0}", _thisinstance); 
     base.OnDestroy(); 
     Console.WriteLine("Destroyed instance {0}", _thisinstance); 
    } 
} 

现在，我在MainActivity开始十一时二十分五十秒通过impressumButton.Click += delegate { StartActivity(typeof(ImpressumActivity)); };的activiy，然后我按后退按钮，在11时20分53秒。活动“保持”在屏幕上;实际上它得到了重新创建，我可以从输出中看到：

10-07 11:20:50.255 I/mono-stdout(6149): Creating instance 0 
10-07 11:20:50.275 I/mono-stdout(6149): Created instance 0 
10-07 11:20:50.275 D/Activity(6149): setTransGradationMode to true 
10-07 11:20:53.535 I/mono-stdout(6149): Finishing instance 0 
10-07 11:20:53.555 I/mono-stdout(6149): Finished instance 0 
10-07 11:20:53.565 I/mono-stdout(6149): Pausing instance 0 
10-07 11:20:53.585 I/mono-stdout(6149): Paused instance 0 
10-07 11:20:53.605 I/mono-stdout(6149): Creating instance 1 
10-07 11:20:53.625 I/mono-stdout(6149): Created instance 1 
10-07 11:20:53.625 D/Activity(6149): setTransGradationMode to true 
10-07 11:20:54.015 I/mono-stdout(6149): Stopping instance 0 
10-07 11:20:54.015 I/mono-stdout(6149): Stopped instance 0 
10-07 11:20:54.015 I/mono-stdout(6149): Destroying instance 0 
10-07 11:20:54.015 I/mono-stdout(6149): Destroyed instance 0 

我在其他活动中具有相同的行为。我试过NoHistory=true，这有帮助，但打破了其他的事情（我想要在更复杂的活动中的通话记录），有和没有ParentActivity = ...，但我卡住了。

更新：这是一个可以重现的MainActivity（）行为： （）：请注意，我描述的行为并不总是显示。当我第二次进入ImpressumActivity时，似乎出现主要是，或者更具体地说，我需要在第n次进入活动时按“返回”n（尽管它每次都被销毁！）

[Activity(Label = "@string/MainHL", MainLauncher = true, Icon = "@drawable/icon")] 
public class MainActivity : Activity 
{ 
    protected override void OnCreate(Bundle bundle) 
    { 
     base.OnCreate(bundle); 
     SetContentView(Resource.Layout.Main); 
    } 

    protected override void OnResume() 
    { 
     base.OnResume(); 
     var impressumButton = FindViewById<Button>(Resource.Id.impressum); 
     impressumButton.Click += delegate { StartActivity(typeof (ImpressumActivity)); }; 
    } 
} 

Answer 1

确实，这是问题所在。每次OnResume发生线路点击事件，但您不释放它。它会导致点击后创建许多新的活动实例。而不是在OnCreate中点击线路事件，你会没事的。