android - 无法使用 Android 支持库 v4

Question

我正在尝试使用 android.support.v4 库中的 DrawerLayout。我已经使用 Nuget 添加了 Xamarin.Android.Support.v4 包，但我仍然无法编译该应用程序，并且遇到以下错误:

    Error   1    error: cannot find symbol
        android.support.v4.content.Loader.OnLoadCanceledListener
  symbol:   class OnLoadCanceledListener
  location: class Loader
    xxx\obj\Debug\android\src\mono\android\support\v4\content\Loader_OnLoadCanceledListenerImplementor.java 8   36  xxx
Error   6    error: cannot find symbol
        android.support.v4.view.MenuItemCompat.OnActionExpandListener
  symbol:   class OnActionExpandListener
  location: class MenuItemCompat
    xxx\obj\Debug\android\src\mono\android\support\v4\view\MenuItemCompat_OnActionExpandListenerImplementor.java    8   41  xxx
Error   7    error: cannot find symbol
        android.support.v4.view.OnApplyWindowInsetsListener
  symbol:   class OnApplyWindowInsetsListener
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\OnApplyWindowInsetsListenerImplementor.java  8   26  xxx
Error   12   error: cannot find symbol
        android.support.v4.view.ViewPropertyAnimatorListener
  symbol:   class ViewPropertyAnimatorListener
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\ViewPropertyAnimatorListenerImplementor.java 8   26  xxx
Error   13   error: cannot find symbol
        android.support.v4.view.ViewPropertyAnimatorUpdateListener
  symbol:   class ViewPropertyAnimatorUpdateListener
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\ViewPropertyAnimatorUpdateListenerImplementor.java   8   26  xxx
Error   10   error: cannot find symbol
    private native android.support.v4.view.WindowInsetsCompat n_onApplyWindowInsets (android.view.View p0, android.support.v4.view.WindowInsetsCompat p1);
  symbol:   class WindowInsetsCompat
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\OnApplyWindowInsetsListenerImplementor.java  32  128 xxx
Error   11   error: cannot find symbol
    private native android.support.v4.view.WindowInsetsCompat n_onApplyWindowInsets (android.view.View p0, android.support.v4.view.WindowInsetsCompat p1);
  symbol:   class WindowInsetsCompat
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\OnApplyWindowInsetsListenerImplementor.java  32  40  xxx
Error   8    error: cannot find symbol
    public android.support.v4.view.WindowInsetsCompat onApplyWindowInsets (android.view.View p0, android.support.v4.view.WindowInsetsCompat p1)
  symbol:   class WindowInsetsCompat
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\OnApplyWindowInsetsListenerImplementor.java  27  118 xxx
Error   9    error: cannot find symbol
    public android.support.v4.view.WindowInsetsCompat onApplyWindowInsets (android.view.View p0, android.support.v4.view.WindowInsetsCompat p1)
  symbol:   class WindowInsetsCompat
  location: package android.support.v4.view
    xxx\obj\Debug\android\src\mono\android\support\v4\view\OnApplyWindowInsetsListenerImplementor.java  27  32  xxx
Error   2    error: package android.support.v4.media.session.MediaSessionCompat does not exist
        android.support.v4.media.session.MediaSessionCompat.OnActiveChangeListener
    xxx\obj\Debug\android\src\mono\android\support\v4\media\session\MediaSessionCompat_OnActiveChangeListenerImplementor.java   8   54  xxx
Error   3    error: package android.support.v4.os.CancellationSignal does not exist
        android.support.v4.os.CancellationSignal.OnCancelListener
    xxx\obj\Debug\android\src\mono\android\support\v4\os\CancellationSignal_OnCancelListenerImplementor.java    8   43  xxx
Error   4    error: package android.support.v4.view.ActionProvider does not exist
        android.support.v4.view.ActionProvider.SubUiVisibilityListener
    xxx\obj\Debug\android\src\mono\android\support\v4\view\ActionProvider_SubUiVisibilityListenerImplementor.java   8   41  xxx
Error   5    error: package android.support.v4.view.ActionProvider does not exist
        android.support.v4.view.ActionProvider.VisibilityListener
    xxx\obj\Debug\android\src\mono\android\support\v4\view\ActionProvider_VisibilityListenerImplementor.java    8   41  xxx
Error   14   error: package android.support.v4.widget.SwipeRefreshLayout does not exist
        android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener
    xxx\obj\Debug\android\src\mono\android\support\v4\widget\SwipeRefreshLayout_OnRefreshListenerImplementor.java   8   47  xxx

在我看来，我应该向 Xamarin 项目添加一个 jar 或类似的东西，请告诉我如果我现在是对的，我应该如何以及在何处执行此操作。感谢您的帮助

Answer 1

对我来说，这是由于在重新安装后我的第一个 Xamarin 项目的初始构建期间杀死 VS 造成的。

看起来好像进程已挂起，但显然它正在以缓慢的速度从谷歌下载。

退出 Visual Studio

删除/重命名 c:\Users\username\AppData\Local\Xamarin

再次打开解决方案

清洗溶液

编译，等到完全结束。

在 Windows 上，使用资源监视器确定下载是否正在进行。

MSBuild 将从 something.1e100.net 下载。