當Android終止活動並再次啟動活動時，是否可以完全重新啟動應用程序？

Question

我的應用程序有多個活動，其中一些活動具有復雜的視圖模型，並且它們之間的依賴性很高。 當Android需要它時，它會終止該過程，並且當用戶再次導航到該應用程序時，將調用最后使用的活動的OnCreate。 重建以前的狀態很復雜，並且對於應用程序的類型沒有價值。 當用戶導航到被終止的活動時，系統會從頭開始重新啟動應用程序，這將變得更加容易和強大。

有辦法嗎？

Answer 1

你可以這樣

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);
    }

}

創建一個SplashActivity.cs ，它是啟動活動：

[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();
    }
}

然后創建BaseActivity.cs ，所有活動將其擴展到SplashActivity旁邊：

[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);
}