用于使用 PackageInstaller API 安装 apk 的 Xamarin Android 代码.

Xamarin Android Code for installing an apk with the PackageInstaller API.

//Change to your package name
    const string PACKAGE_INSTALLED_ACTION =
                "com.example.android.apis.content.SESSION_API_PACKAGE_INSTALLED";

     public static void InstallPackageAndroidQAndAbove(Context context, string filePath)
            {

                var packageInstaller = context.PackageManager.PackageInstaller;
                var sessionParams = new PackageInstaller.SessionParams(PackageInstallMode.FullInstall);
                int sessionId = packageInstaller.CreateSession(sessionParams);
                var session = packageInstaller.OpenSession(sessionId);

                addApkToInstallSession(filePath, session);

                // Create an install status receiver.
                Intent intent = new Intent(context, context.Class);
                intent.SetAction(Globals.PACKAGE_INSTALLED_ACTION);
                PendingIntent pendingIntent = PendingIntent.GetActivity(context, 0, intent, 0);
                IntentSender statusReceiver = pendingIntent.IntentSender;

                // Commit the session (this will start the installation workflow).
                session.Commit(statusReceiver);

            }

     private static void addApkToInstallSession(string filePath, PackageInstaller.Session session)
            {
                using (var input = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    using (var packageInSession = session.OpenWrite("package", 0, -1))
                    {
                        input.CopyTo(packageInSession);
                        packageInSession.Close();
                    }
                    input.Close();
                }
                //That this is necessary could be a Xamarin bug.
                GC.Collect();
                GC.WaitForPendingFinalizers();
                GC.Collect();

            }

// Note: this Activity must run in singleTop launchMode for it to be able to receive the //intent
     protected override void OnNewIntent(Intent intent)
            {
                base.OnNewIntent(intent);

                Bundle extras = intent.Extras;

                if (Globals.PACKAGE_INSTALLED_ACTION.Equals(intent.Action))
                {
                    int status = extras.GetInt(PackageInstaller.ExtraStatus);
                    String message = extras.GetString(PackageInstaller.ExtraStatusMessage);

                    switch (status)
                    {
                        case (int)PackageInstallStatus.PendingUserAction:
                            // This test app isn't privileged, so the user has to confirm the install.
                            Intent confirmIntent = (Intent)extras.Get(Intent.ExtraIntent);
                            StartActivity(confirmIntent);
                            break;
                        case (int)PackageInstallStatus.Success:
                            Toast.MakeText(this, "Install succeeded!", ToastLength.Long).Show();
                            break;
                        case (int)PackageInstallStatus.Failure:
                        case (int)PackageInstallStatus.FailureAborted:
                        case (int)PackageInstallStatus.FailureBlocked:
                        case (int)PackageInstallStatus.FailureConflict:
                        case (int)PackageInstallStatus.FailureIncompatible:
                        case (int)PackageInstallStatus.FailureInvalid:
                        case (int)PackageInstallStatus.FailureStorage:
                            Toast.MakeText(this, "Install failed! " + status + ", " + message,
                                    ToastLength.Long).Show();
                            break;
                        default:
                            Toast.MakeText(this, "Unrecognized status received from installer: " + status,
                                   ToastLength.Long).Show();
                            break;
                    }
                }


            }