title: Xamarin issue when the app go OnSleep using the back button
body: <p>im having an issue with mi xamarin app, if my app go onSleep using the home button of the phone its resume with no problem, but if i use the back button the app stay freeze in a white screen and never hits the OnResume(), i want it to have the same behavior or at least that using the back button close the app entirely</p>
  <p>Code</p>
  <pre><code>protected override void OnStart ()
      {
          // Handle when your app starts
      }
      protected override void OnResume()
      {
          base.OnResume();
          App.IsInBackgrounded = false;
      }
      protected override void OnSleep ()
      {
          // Handle when your app sleeps
          base.OnSleep();
          App.IsInBackgrounded = true;
      }
  </code></pre>
  <p>The Output when i use the home button</p>
  <pre><code>12-23 11:23:35.517 D/ViewRootImpl@b3d0e31[MainActivity](15966): Relayout returned: old=(0,0,1080,2340) new=(0,0,1080,2340) req=(1080,2340)4 dur=21 res=0x1 s={false 0} ch=false
  12-23 11:23:35.518 D/ViewRootImpl@b3d0e31[MainActivity](15966): stopped(false) old=true
  12-23 11:23:35.620 D/ViewRootImpl@b3d0e31[MainActivity](15966): stopped(false) old=false
  12-23 11:23:35.705 D/ViewRootImpl@b3d0e31[MainActivity](15966): Relayout returned: old=(0,0,1080,2340) new=(0,0,1080,2340) req=(1080,2340)0 dur=28 res=0x7 s={true 530976370688} ch=true
  12-23 11:23:35.705 D/OpenGLRenderer(15966): createReliableSurface : 0x7bf7e1bf80, 0x7ba0a87000
  12-23 11:23:35.739 D/mali_winsys(15966): EGLint new_window_surface(egl_winsys_display *, void *, EGLSurface, EGLConfig, egl_winsys_surface **, EGLBoolean) returns 0x3000
  12-23 11:23:35.950 I/om.kuwaidev.tp(15966): Explicit concurrent copying GC freed 2262(149KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 3171KB/6343KB, paused 77us total 27.240ms
  12-23 11:23:35.954 D/Mono    (15966): GC_TAR_BRIDGE bridges 537 objects 25741 opaque 12967 colors 537 colors-bridged 537 colors-visible 537 xref 7 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.10ms tarjan 19.63ms scc-setup 0.18ms gather-xref 0.01ms xref-setup 0.01ms cleanup 2.11ms
  12-23 11:23:35.954 D/Mono    (15966): GC_BRIDGE: Complete, was running for 34.77ms
  12-23 11:23:35.954 D/Mono    (15966): GC_MINOR: (Nursery full) time 35.83ms, stw 37.16ms promoted 675K major size: 8784K in use: 7971K los size: 7168K in use: 5791K
  12-23 11:23:35.983 D/ViewRootImpl@b3d0e31[MainActivity](15966): MSG_WINDOW_FOCUS_CHANGED 1 1
  12-23 11:23:35.984 D/InputMethodManager(15966): prepareNavigationBarInfo() DecorView@fbe4d10[MainActivity]
  12-23 11:23:35.984 D/InputMethodManager(15966): getNavigationBarColor() -11427245
  12-23 11:23:36.002 D/InputMethodManager(15966): prepareNavigationBarInfo() DecorView@fbe4d10[MainActivity]
  12-23 11:23:36.002 D/InputMethodManager(15966): getNavigationBarColor() -11427245
  12-23 11:23:36.003 V/InputMethodManager(15966): Starting input: tba=com.kuwaidev.tpv ic=null mNaviBarColor -11427245 mIsGetNaviBarColorSuccess true , NavVisible : true , NavTrans : false
  12-23 11:23:36.003 D/InputMethodManager(15966): startInputInner - Id : 0
  12-23 11:23:36.003 I/InputMethodManager(15966): startInputInner - mService.startInputOrWindowGainedFocus
  </code></pre>
  <p>the output when i use the back button <a href="https://drive.google.com/file/d/1W5WCeEzASjtPnhhsLmwNaQunloy0X5L_/view?usp=sharing" rel="nofollow noreferrer">output</a></p>