当Android终止活动并再次启动活动时，是否可以完全重新启动应用程序？

Question

我的应用程序有多个活动，其中一些活动具有复杂的视图模型，并且它们之间的依赖性很高。 当Android需要它时，它会终止该过程，并且当用户再次导航到该应用程序时，将调用最后使用的活动的OnCreate。 重建以前的状态很复杂，并且对于应用程序的类型没有价值。 当用户导航到被终止的活动时，系统会从头开始重新启动应用程序，这将变得更加容易和强大。

有办法吗？

Answer 1

你可以这样

custon MyApplication.cs ：

[Application]
public class MyApplication : Application
{

    public static int APP_STATUS_KILLED = 0; // Represents that the application was started after it was killed
    public static int APP_STATUS_NORMAL = 1; // Represents the normal startup process at application time
    public static int APP_STATUS = APP_STATUS_KILLED; // Record the startup status of the App
    private static Context context;

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

        context = GetAppContext();
    }

    public static Context GetAppContext()
    {
        return context;
    }

    /**
     * Reinitialize the application interface, empty the current Activity stack, and launch the welcome page
     */
    public static void ReInitApp()
    {
        Intent intent = new Intent(GetAppContext(), typeof(SplashActivity));
        intent.SetFlags(ActivityFlags.ClearTask| ActivityFlags.NewTask);
        GetAppContext().StartActivity(intent);
    }

}

创建一个SplashActivity.cs ，它是启动活动：

[Activity(Label = "SplashActivity")]
public class SplashActivity : Activity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        MyApplication.APP_STATUS = MyApplication.APP_STATUS_NORMAL; //App starts normally. Set the startup status of App to normal startup
        base.OnCreate(savedInstanceState);

        SetContentView(Resource.Layout.activity_splash);

        GoMain();

    }
    private void GoMain()
    {
        Intent intent = new Intent(this, typeof(MainActivity));
        StartActivity(intent);
        Finish();
    }
}

然后创建BaseActivity.cs ，所有活动将其扩展到SplashActivity旁边：

[Activity(Label = "BaseActivity")]
public abstract class BaseActivity : Activity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        if (MyApplication.APP_STATUS != MyApplication.APP_STATUS_NORMAL)
        { // Start the process abnormally and reinitialize the application interface directly
            MyApplication.ReInitApp();
            Finish();
            return;
        }
        else
        { // Normal startup process
            SetUpViewAndData(savedInstanceState); // child Activity initialization
        }

    }
    //Provide an interface to the subactivity setup interface. Do not initialize in onCreate
    protected abstract void SetUpViewAndData(Bundle savedInstanceState);
}