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Android StartActivityForResult and Finish (with video)
原标题:

I have a MainActivity class with an "Add Item" button and a listview and a AddItemActivity class with a textbox and a "save" button. The user should click on the "Add Item", go to the AddItemActivity screen, enter an item, click save and then go back to the updated MainActivity screen.

(BTW, I m using MonoDroid, but I don t think this is necessary a MonoDroid specific problem).

My "Add item" click event (on main activity):

    private void addItemButton_Click(object sender, EventArgs e)
    {
        var intent = new Intent();
        intent.SetClassName(this, "monoApp.AddItemClassName");
        StartActivityForResult(intent, 0);
    }

My "Save" click event (on add item activity):

    private void saveButton_Click(object sender, EventArgs e)
    {
        var itemname = FindViewById<EditText>(Resource.id.itemName);

        _repo.SaveItem(new Item() {Name = itemname.Text.ToString()});

        Toast.MakeText(this, "You saved: " + itemname.Text, ToastLength.Short).Show();

        var intent = new Intent();
        SetResult(Result.Ok, intent);
        Finish();
    }

And then back in main activity:

    protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
    {
        base.OnActivityResult(requestCode, resultCode, data);

        RefreshTheList();
    }

This works like a charm, on the first time. The screen slides over to add item , and then slides back to main when it s done. The second time, it slides over, but then it slides back to itself, if that makes any sense. And then if I hit save again, it goes back to working fine.

If video would help, I ve posted a clip of what I m seeing to TwitVid: http://www.twitvid.com/W7XZC

Basically, I don t want it to "slide back to itself" ever, so what am I doing wrong?

最佳回答

I don t see anything wrong in your code here...I am taking a guess here.

Your Second activity might be getting launched multiple times in the second attempt somehow from your remaining portions of the code.

Print a log inside your addItemButton_Click and check. If the log is getting printed twice then it is calling the method 2 times somehow.

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