Question

我有一个MainActivity，它有3个片段。其中2个片段中包含列表，单击列表项我转到另一个活动（即NewActivity）。我在NewActivity上实现了一个ActionBar，并希望返回此活动的调用片段。

我有以下代码：

MainActivity.cs

var mongodb = require('mongodb');
function ConnectToDB(mongoUrl){
    var MongoClient = mongodb.MongoClient;
    //var url = 'mongodb://localhost:27017/my_database_name';
    var url = mongoUrl || 'mongodb://' + process.env.IP + ":27017/test";
    // Use connect method to connect to the Server
    MongoClient.connect(url, function(err, db) {
        if(err){
           console.log(err); 
        }
      console.log("Connected correctly to server");
      return db;
    });
}

FragmentList1.cs

SupportActionBar.SetDisplayHomeAsUpEnabled(true);
            SupportActionBar.SetDisplayShowHomeEnabled(true);
var ft = SupportFragmentManager.BeginTransaction();
            ft.Add(Resource.Id.fragment_container, homeFragment, "FRAG_HOME").SetBreadCrumbShortTitle("FRAG_HOME");

            ft.Add(Resource.Id.fragment_container, FragmentList1, "FRAG_LIST1").SetBreadCrumbShortTitle("FRAG_LIST1");

            ft.Hide(FragmentList1);
            ft.Add(Resource.Id.fragment_container, FragmentList2, "FRAG_LIST2").SetBreadCrumbShortTitle("FRAG_LIST2");
            ft.AddToBackStack(null);
            ft.Hide(FragmentList2);

            ft.Commit();

NewActivity.cs

 void LvLatestArticles_ItemClick (object sender, AdapterView.ItemClickEventArgs e)
        {
            Intent intent = new Intent(Activity, typeof(NewActivity));
            StartActivity(intent);
        }

在上面的代码中，我覆盖了ActionBar上的Home按钮功能。但它根本不做任何事情。我该怎么做呢？任何帮助将不胜感激

Answer 1

尝试在主页按钮上调用OnBackPressed()。像这样： -

    public override bool OnOptionsItemSelected(IMenuItem item){
         switch(item.ItemId){
            case Android.Resource.Id.Home:
                     base.OnBackPressed();                    
                     break;
            }
         return base.OnOptionsItemSelected(item);
    }

导航回从另一个活动调用Fragment

1 个答案: