如何在Xamarin Android中更新TabHost指示器

Question

我需要动态更改标签指标。我可以在Java中找到答案，但在Xamarin中找不到。我尝试使用Java代码，但是没有用。这是我的代码。

布局代码：

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="fill_parent"   
        android:orientation="vertical"
        android:id="@+id/llcheckoutmiddle"
        android:layout_below="@id/llcheckouttop">
        <TabHost
            android:minWidth="25px"
            android:minHeight="25px"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tabHostChkOut">
            <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:id="@+id/linearLayout1">
               <TabWidget
                    android:id="@android:id/tabs"
                    android:layout_width="match_parent"
                    android:layout_height="50dp" />
                <FrameLayout
                    android:id="@android:id/tabcontent"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" />
            </LinearLayout>
        </TabHost>
    </LinearLayout>

活动代码：

            LocalActivityManager localActMgr = new LocalActivityManager(this, false);
            localActMgr.DispatchCreate(bundle);

            TabHost tabHost = FindViewById<TabHost>(Resource.Id.tabHostChkOut);
            tabHost.Setup(localActMgr);

            TabHost.TabSpec tabSpec = null;
            Intent intent = new Intent();

            intent = new Intent();
            intent.SetFlags(ActivityFlags.NewTask);
            intent.SetClass(this, typeof(RouteCheckoutExc));
            tabSpec = tabHost.NewTabSpec("Exc");
            tabSpec.SetContent(intent);
            tabSpec.SetIndicator("Exc (" + ExcCount + ")");
            tabHost.AddTab(tabSpec);


            intent = new Intent();
            intent.SetFlags(ActivityFlags.NewTask);
            intent.SetClass(this, typeof(RouteCheckoutRed));
            tabSpec = tabHost.NewTabSpec("Red");
            tabSpec.SetContent(intent);
            tabSpec.SetIndicator("Red (" + RedCount + ")");
            tabHost.AddTab(tabSpec);

我尝试了以下Java代码。它没有用。

TextView txt = tabHost.GetChildAt(1).FindViewById(<Here I dont know what control I should give since there is no title defined>);

Answer 1

在Xamarin.Android中，应为：

  TextView txt = tabHost.GetChildAt(0).FindViewById<TextView>(Resource.Id.title);

或

  TextView txt = (TextView)tabHost.TabWidget.GetChildTabViewAt(0).FindViewById<TextView>(Resource.Id.title);

要更新Xamarin Android中的TabHost指示器：

    ViewGroup tabInidcator = (ViewGroup)tabHost.TabWidget.GetChildTabViewAt(0);

    ImageView img = (ImageView)tabInidcator.GetChildAt(0);

    TextView title = (TextView) tabInidcator.GetChildAt(1);
    title.Text = "xyz";