我知道已经有很多问题在讨论这个问题，但我仍然无法弄清楚我的实现有什么问题。
我正在使用带有 4 个选项卡的 ActionBar 的 SherlockFragmentActivity，每个选项卡都用不同的 Fragment 填充 FrameLayout。
到这里我没有问题，标签在片段之间完美切换。
但是在“购买”选项卡上，当单击 searchButton 时，我使用 Activity1 NavigateTo 方法将 FrameLayout 替换为另一个 ListFragment，这会导致当前 Fragment 重叠并且无论我从这一点做什么都不会消失。
请指教，我已阅读所有解决方案，但找不到问题，如果需要另一部分代码，请告诉我
这是我的代码：Activity1：
public class Activity1 : SherlockFragmentActivity, ActionBar_Sherlock.App.ActionBar.ITabListener
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
userid = 2;
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
SupportActionBar.NavigationMode = (int)ActionBarNavigationMode.Tabs;
SupportActionBar.SetDisplayShowTitleEnabled(true);
//Set the mobile service Sale table adapter
//this.adapter = new SalesAdapter(this.MobileServiceContext.SaleTable, Resource.Layout.OffersListItem, this);
//Initialize tabs
Tab tab = SupportActionBar.NewTab();
tab.SetTag("MyProfile");
tab.SetText("My Profile");
tab.SetTabListener(this);
SupportActionBar.AddTab(tab);
tab = SupportActionBar.NewTab();
tab.SetTag("Buy");
tab.SetText("Buy");
tab.SetTabListener(this);
SupportActionBar.AddTab(tab);
tab = SupportActionBar.NewTab();
tab.SetTag("Sell");
tab.SetText("Sell");
tab.SetTabListener(this);
SupportActionBar.AddTab(tab);
tab = SupportActionBar.NewTab();
tab.SetTag("Rates");
tab.SetText("Rates");
tab.SetTabListener(this);
SupportActionBar.AddTab(tab);
}
public void OnTabSelected(Tab tab, Android.Support.V4.App.FragmentTransaction ft)
{
string tag = tab.Tag.ToString();
Android.Support.V4.App.Fragment f = SupportFragmentManager.FindFragmentByTag(tag);
if (f != null)
{
ft.Show(f);
return;
}
if (tag == "MyProfile")
f = new Fragments.MyProfileFragment();
else if (tag == "Buy")
f = new Fragments.BuyFragment();
else if (tag == "Sell")
f = new Fragments.SaleFragment();
else if (tag == "Rates")
f = new Fragments.BuyFragment();
ft.Add(Resource.Id.fragmentContainer, f, tag);
}
public void OnTabUnselected(Tab tab, Android.Support.V4.App.FragmentTransaction ft)
{
string tag = tab.Tag.ToString();
Android.Support.V4.App.Fragment f = SupportFragmentManager.FindFragmentByTag(tag);
if (f != null)
{
ft.Hide(f);
return;
}
}
public void OnTabReselected(Tab tab, Android.Support.V4.App.FragmentTransaction ft)
{
//Do nothing
}
public void NavigateTo(Android.Support.V4.App.Fragment newFragment)
{
Android.Support.V4.App.FragmentManager manager = SupportFragmentManager;
Android.Support.V4.App.FragmentTransaction ft = manager.BeginTransaction();
ft.Replace(Resource.Id.fragmentContainer, newFragment);
ft.SetTransition((int)FragmentTransit.FragmentFade);
// Add this trnasaction to the back stack, so when the user press back,
// it rollbacks.
ft.AddToBackStack(null);
ft.Commit();
}
public override void OnBackPressed()
{
Android.Support.V4.App.FragmentManager manager = SupportFragmentManager;
if (manager.BackStackEntryCount > 0)
{
base.OnBackPressed();
}
else
{
}
}
}
这是主布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:id="@+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1" />
</LinearLayout>
这是 BuyFragment：
public class BuyFragment : Android.Support.V4.App.Fragment
{
private Activity1 myActivity;
private string currency;
private int amount;
private EditText buyAmount;
private Button searchButton;
private Spinner currencySpinner;
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
myActivity = (Activity1)this.Activity;
}
public override void OnActivityCreated(Bundle savedInstanceState)
{
base.OnActivityCreated(savedInstanceState);
//Init the currency spinner
currencySpinner = this.Activity.FindViewById<Spinner>(Resource.Id.spinnerBuy);
myActivity.InitCurrencySpinner(currencySpinner);
//Parse the amount text to int
buyAmount = this.Activity.FindViewById<EditText>(Resource.Id.buyEdittext);
buyAmount.AfterTextChanged += (sender, args) =>
{
//
int result;
int.TryParse(buyAmount.Text, out result);
amount = result;
};
searchButton = this.Activity.FindViewById<Button>(Resource.Id.buyButton);
searchButton.Click += (sender, e) =>
{
OnClickSearch(sender, e);
};
//Disable all buttons if the adapter is updating
myActivity.SalesAdapter.IsUpdatingChanged += (s, e) =>
{
this.buyAmount.Enabled =
this.currencySpinner.Enabled =
this.searchButton.Enabled =
!myActivity.SalesAdapter.IsUpdating;
};
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle)
{
return inflater.Inflate(Resource.Layout.BuyLayout, container, false);
}
private void OnClickSearch(object sender, EventArgs eventArgs)
{
try
{
if (amount > 0)
{
currency = currencySpinner.SelectedItem.ToString();
SearchOffers();
this.buyAmount.Text = null;
}
else
{
Toast.MakeText(this.Activity, "Amount must be a number larger than 0", ToastLength.Short).Show();
}
}
catch (Exception e)
{
Console.WriteLine("SaleFragment.OnClickPutForSale: {0} Exception caught.", e.InnerException);
}
}
private void SearchOffers()
{
//Check what fragment is shown, replace if needed.
var fragmentContainer = FragmentManager.FindFragmentById(Resource.Id.fragmentContainer) as SearchListFragment;
if (fragmentContainer == null)
{
// Make new fragment to show this selection.
fragmentContainer = SearchListFragment.NewInstance(amount, currency);
// Execute a transaction, replacing any existing
// fragment with this one inside the frame.
myActivity.NavigateTo(fragmentContainer);
}
//else
//{
// fragmentContainer.Arguments.PutString("currency", currency);
// fragmentContainer.Arguments.PutInt("amount", amount);
// myActivity.NavigateTo(fragmentContainer);
//}
}
购买布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:padding="10dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:text="@string/currency_prompt"
android:layout_marginBottom="10dp" />
<Spinner
android:id="@+id/spinnerBuy"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="@string/currency_prompt"
android:layout_marginTop="10dp"
android:layout_marginBottom="10.0dp" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:text="@string/amount_prompt"
android:layout_marginBottom="10dp" />
<EditText
android:id="@+id/buyEdittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:inputType="number" />
<Button
android:text="@string/BuyButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/buyButton"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp" />
</LinearLayout>